NB/T 25043.2-2019Technical specification for construction of nuclear power conventional island and balance of plant - Part 2: Turbine generator unit (English PDF)

Foreword

This document was issued on 30 December 2019 by the National Energy Administration of the PRC and takes effect on 1 July 2020.

It is a NB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 27.120, Chinese classification F 01.

NB/T 25043, Technical specification for construction of nuclear power conventional island and balance of plant, consists of nine parts.

Part 1: Civil works.

Part 2: Turbine generator unit.

Part 3: Circulating water system equipment.

Part 4: Thermal instrumentation and control devices.

Part 5: Water treatment and hydrogen production systems.

Part 6: Piping.

Part 7: Heating, ventilation and air conditioning.

Part 8: Thermal insulation and painting.

Part 9: Machining and prefabrication.

This document is Part 2 of NB/T 25043.

This part was drafted in accordance with the rules given in GB/T 1.1-2009, Directives for standardization - Part 1: Structure and drafting of standards.

This part was proposed by and is under the jurisdiction of the China Electricity Council.

The chief drafting organization of this part is: China Nuclear Power Engineering Co., Ltd.

The participating drafting organizations of this part are: Shanghai Electric Power Generation Equipment Co., Ltd., Dongfang Electric Corporation Co., Ltd., and China Energy Engineering Group Guangdong Thermal Power Engineering Co., Ltd.

The chief drafters of this part are: Yang Xinsheng, Zhang Quan, Liu Xiaoxuan, He Botao, Zhang Li, Zhou Yigong, Liu Banghui, Hou Xucheng, Liu Jinwei, Long Youxin, Liang Feng, Lu Ping, Fan Chengxi, Wu Chunyan, Li Cheng, Yan Zhaohai, Sheng Hao, Zhou Qi, Deng Zhanhui and Zhao Jiaming.

Comments and suggestions arising during the implementation of this part should be fed back to the Standardization Management Center of the China Electricity Council (No. 1, Baiguang Road Erqiao, Beijing, 100761).

Publication data and document identification

Standard designation printed on the cover: NB/T 25043.2-2019.

Chinese title on the cover: 核电厂常规岛及辅助配套设施建设施工技术规范 - 第2部分: 汽轮发电机组.

Official English title printed on the cover: Technical specification for construction of nuclear power conventional island and balance of plant - Part 2: Turbine generator unit.

Standard series: NB, Energy industry standard of the People's Republic of China (中华人民共和国能源行业标准).

ICS classification: 27.120. Chinese Classified Standard (CCS) code: F 01.

Date of issue printed on the cover: 30 December 2019 (2019-12-30 发布).

Date of implementation printed on the cover: 1 July 2020 (2020-07-01 实施).

Issuing body: National Energy Administration (国家能源局 发布).

Status: recommended standard (the letter T in the designation NB/T indicates a recommended, non mandatory energy industry standard).

No superseded standard is indicated on the cover: the cover carries no 代替 line, so this document does not replace an earlier designation.

Front matter pagination: the table of contents occupies pages I and II and the foreword occupies page III, in Roman numerals; the technical text starts at Arabic page 1 and the bibliography ends at page 81.

Structure of the document

The document is organized in ten clauses followed by five annexes and a bibliography, as set out in the official table of contents.

Clauses 1 to 3 form the introductory part: scope, normative references and terms and definitions, all beginning at page 1.

Clause 4, General provisions, starting at page 3, is divided into basic requirements, equipment unpacking inspection and storage, coordination with civil construction, and equipment installation.

Clause 5, Steam turbine proper, starting at page 6, is the largest clause of the document; it runs to page 26 and covers general requirements, the foundation, the sole plates, shims and anchor bolts, the cylinders, bearing pedestals and sliding pin system, the bearings and oil deflectors, the rotor, the flow path equipment, the turning gear, the closing of the cylinder, the shafting alignment and coupling connection, and the secondary grouting and curing of the foundation.

Clause 6, Generator and excitation device, running from page 27 to page 38, covers the foundation and supporting components, the bearing pedestals and bearings, the stator, the generator rotor, the adjustment of the stator and rotor position and the end covers, the shaft sealing device of totally hydrogen cooled and water-hydrogen-hydrogen cooled generators, the coolers, the cooling water system, the generator gas system, the complete tightness test, the excitation device, and the shafting alignment and coupling connection.

Clause 7, Governing and protection devices and oil systems, running from page 38 to page 48, covers the electro-hydraulic control system and protection devices, the steam valves and their driving mechanisms, the main oil pump, the control oil system, the lubricating oil system and the generator seal oil system.

Clause 8, Piping within the scope of the steam turbine proper, pages 48 to 50, covers general requirements, valves and fittings and pipe installation.

Clause 9, Auxiliary equipment, pages 50 to 60, covers the condenser, general surface heat exchangers, the moisture separator reheater, the deaerator, tanks and vessels and the temperature and pressure reducing device.

Clause 10, Attached machinery, pages 60 to 74, covers general horizontal pumps, feedwater pumps and their auxiliary devices, liquid ring vacuum pumps and their auxiliary devices, general vertical pumps, condensate pump sets and general submersible pumps.

Annex A (normative), page 74, gives the construction requirements for the mortar bedding blocks under the steam turbine sole plates; it is invoked by 5.3.2 whenever the design does not state clear requirements.

Annex B (informative), page 75, lists the types of commonly used sealing materials and their scope of application; Annex C (informative), page 77, gives the cleanliness standards for lubricating oil and for fire-resistant oil.

Annex D (normative), page 78, gives the sag calculation formula to be used when alignment is carried out by steel wire; Annex E (normative), page 79, gives the tightness test standard for the generator hydrogen system, invoked by 6.11.

The bibliography closes the document at page 81.

1 Scope

NB/T 25043.2-2019 is Part 2 of the Chinese construction specification for the conventional island and balance of plant of a nuclear power station, and it covers the turbine generator unit. This is the largest rotating machine on the site - a steam turbine of 600 MW or more with its generator and exciter - and the specification governs how it is put together on site, from receipt of the components to the checks made before first roll. It sets the scope, the normative references and the defined terms, then the general requirements on the construction organisation, the environmental and cleanliness conditions the work demands, the handling and storage of components, and the records to be kept. Installation is then covered piece by piece: the foundation and its sole plates, the bearings and their alignment, the turbine cylinders and the setting of clearances, the rotor and its coupling alignment, the blading and the gland sealing, the generator stator and rotor with the air or hydrogen cooling system and the exciter, the governing and protection system, the lubricating and control oil systems with their flushing, and the pipework attached to the turbine. The auxiliary equipment follows - condenser, moisture separator reheater, deaerator, feed heaters and pumps - with their installation and pressure testing. Commissioning checks, the tolerances applied at each stage and the acceptance records close the part. It applies to PWR stations built in China.

This part of NB/T 25043 specifies the technical requirements for the construction of the main equipment, auxiliary equipment and attached machinery of the turbine generator unit of the conventional island of a pressurized water reactor nuclear power plant.

This part is applicable to the construction of the main equipment, auxiliary equipment and attached machinery of turbine generator units of the conventional island of pressurized water reactor nuclear power plants with a single unit capacity of the 600 MW class and above.

For turbine generator units of the conventional island of pressurized water reactor nuclear power plants with a single unit capacity below the 600 MW class, this part may be applied by reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including all amendments) applies.

GB/T 242, Metallic materials - Tube - Drift expanding test.

GB/T 246, Metallic materials - Tube - Flattening test.

GB/T 6067.1, Safety rules for lifting appliances - Part 1: General.

GB/T 6067.5, Safety rules for lifting appliances - Part 5: Bridge and gantry cranes.

GB/T 23723 (all parts), Cranes - Safe use.

GB/T 23724 (all parts), Cranes - Inspection.

DL/T 1097, Technical specification for welding of condenser tube plates of thermal power plants.

DL 5009.1, Code of practice for safety working of electric power construction - Part 1: Thermal power generation.

NB/T 20117, Regulations for construction safety management of nuclear power engineering.

NB/T 20119, Regulations for material and item management in the construction of nuclear power engineering.

NB/T 25017, Code for metal technical supervision of nuclear power plant conventional islands.

NB/T 25043.1, Technical specification for construction of nuclear power conventional island and balance of plant - Part 1: Civil works.

NB/T 25043.6, Technical specification for construction of nuclear power conventional island and balance of plant - Part 6: Piping.

NB/T 25085, Technical specification for welding of nuclear power plant conventional islands.

TSG 08, Administrative regulations for the use of special equipment.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1 Roundness. The degree of difference between the actual feature of a circle on a part and the ideal feature, that is, the condition in which each point of the actual feature of the circle remains equidistant from its center. Its tolerance is the maximum permissible variation of the actual circle with respect to the ideal circle within the same cross section.

3.2 Cylindricity. The degree of difference between the actual features of the profile of a cylindrical shaft or of a cylindrical bore and the ideal features, that is, the condition in which each point of the actual profile remains equidistant from its axis. Its tolerance is the maximum permissible variation of the actual cylindrical surface with respect to the ideal cylindrical surface.

3.3 Taper. The degree of inclination of the conical surface of a conical body (cone, truncated cone). The taper of a truncated cone is the ratio of the difference between its large end diameter and its small end diameter to the height of the truncated cone; the taper of a cone is the ratio of its base diameter to the height of the cone.

3.4 Tilt; gradient. The degree of inclination of a straight line or of a plane with respect to its reference line or reference plane. It is usually measured by the ratio method, by the angle method and by similar methods.

3.5 Flatness. The degree of difference between the actual feature of a plane of a part and the ideal plane. Its tolerance is the maximum permissible variation of the actual surface with respect to the ideal plane.

3.6 Parallelism. The degree to which the measured actual feature on a part remains parallel to the reference line or to the reference plane.

3.7 Perpendicularity. The deviation between the actual angle and the ideal right angle formed by two axes, by an axis and a plane, or by two planes.

3.8 Radial circle run out (wobble). The degree to which a surface of revolution on a part remains at an equal distance from the reference axis within a limited measuring plane. A dial indicator is usually set perpendicular to the axial center line of the measured cross section; the rotor journal is turned through one revolution on its supports about its axial center line, and the difference between the maximum and the minimum of the readings measured at all points of the measured surface is the radial circle run out (wobble) value of the shaft at that cross section.

3.9 Axial circle run out (wandering deflection). The degree of perpendicularity of the measured end face of a rotating part to the reference axis when the part revolves continuously about that reference axis. Two points are usually selected on the measured end face, 180 degrees apart in circumferential angle and close to the diameter; a dial indicator perpendicular to the end face is mounted at each of them; the rotor is turned through one revolution and one half of the difference between the maximum and the minimum of the differences simultaneously indicated by the two gauges is the axial circle run out (wandering deflection) value.

3.10 Coaxiality. The degree to which the measured axis of a rotating shaft maintains a uniform, continuous and smooth line with respect to the reference axis, that is, a common axis. Its tolerance is the maximum permissible variation of the measured axis with respect to the reference axis, and it is usually assessed by the radial deviation and the axial deviation at the coupling.

3.11 Concentricity. The degree of deviation, between two connected rotating shafts in the connected condition, of the center of rotation of the characteristic cross section on the measured shaft with respect to the center of rotation of the corresponding cross section of the reference shaft. It is usually assessed by the relative radial circle run out deviation values at the journals adjacent to the connection point of the two shafts and at the coupling.

3.12 Non conformance report (NCR). A report issued in the case where an item does not conform to the requirements of performance, of documents or of procedures, so that the quality of the item becomes unacceptable or indeterminate.

4 General provisions

4.1 Basic requirements.

4.1.1 The construction of the turbine generator unit should be carried out preferentially in accordance with the requirements of the equipment purchase contract, of the technical agreement and of the formally valid technical documents of the manufacturer. Where the purchase contract, the technical agreement and the technical requirements of the manufacturer are not clear, the relevant provisions of this part shall be applied.

4.1.2 The construction and acceptance work of the turbine generator unit shall be based on the design documents and manufacturer documents approved and put into effect batch by batch. Where design documents or manufacturer technical documents already in force need to be modified or changed, the design organization and the equipment manufacturer shall issue the corresponding technical change documents and the relevant examination and approval formalities shall be completed.

4.1.3 Non conformances discovered or occurring during the construction process shall be handled by the relevant organizations in accordance with the relevant provisions for non conformance management.

4.1.4 Apart from the requirements for the civil works related to the turbine generator unit, which follow the relevant industry standards, special requirements shall be implemented in accordance with the relevant provisions of this part.

4.1.5 In addition to being carried out in accordance with this part, the construction of the turbine generator unit shall also comply with the provisions of the relevant technical standards currently in force at national and industry level.

4.2 Equipment unpacking inspection, storage, loading and unloading.

4.2.1.1 After the equipment arrives on site, the unpacking inspection shall be carried out in accordance with the relevant provisions of NB/T 20119. The unpacking inspection shall be performed jointly, as required, by the parties concerned with manufacture, purchasing, supervision, construction management, erection and material management; the designation, specification, quantity and condition of the equipment shall be inspected and recorded, and after the inspection all the parties shall sign. Equipment and components for which defects have occurred repeatedly in the past, or in which defects easily occur, shall be inspected with particular attention.

4.2.1.2 The unpacking inspection of equipment shall comply with the following requirements: a) equipment and components shall not be damaged during unpacking inspection and stocktaking; b) the protective measures of precision equipment and of the finish machined surfaces of equipment shall be intact, otherwise protection shall be reinstated as required; c) before the anti-corrosion coating on moving parts of the equipment has been cleaned off, the corresponding parts shall not be rotated or slid, and after cleaning and inspection anti-rust (anti-corrosion) measures shall still be taken as required; d) equipment (components) which can only be rotated or slid after lubricant has been added or a jacking device has been put into operation shall not be turned or slid at will; e) equipment which is not to be installed for the time being after unpacking inspection shall be repacked and stored as required.

4.2.1.3 At unpacking, the drawings and technical documents accompanying the equipment packing cases shall be checked and, in accordance with the relevant provisions, transferred to the document management department for registration, filing and safekeeping. The technical documents to be supplied by the manufacturer together with the equipment packing cases mainly include: a) the equipment supply list and the equipment packing list; b) the installation, operation and maintenance instructions of the equipment and the relevant technical documents; c) the factory quality certificates, inspection records, test records and major defect treatment records of the equipment; d) the structural drawings and assembly drawings of the equipment and of its components; e) the certificates of the material properties of the main components of the equipment.

4.2.2.1 Equipment shall be stored by categories and zones according to its storage class, shall be clearly identified, and shall comply with the following requirements: a) before installation, and in accordance with the technical documents of the equipment and the relevant requirements of NB/T 20119, measures against freezing, damp, earthquake, impact, dust and overturning shall be adopted according to the characteristics of the equipment, the meteorological conditions on site, the surrounding environment and the storage time, and deformation, deterioration, damage, rust (corrosion) and loss of the equipment shall be prevented; for coastal salt fog areas and for environments containing corrosive substances, special measures shall be adopted to prevent rust (corrosion) of the equipment; b) the drainage of the storage site shall be unobstructed; the storage area shall have clear boundaries and fire fighting passages, and shall be provided with reliable fire fighting facilities and effective lighting; c) the storage floor and the racks shall have sufficient bearing capacity; the equipment shall be firmly and reliably supported, shall be kept at a certain height above the floor, and shall not be stacked too high; d) the storage position of large items shall be rationally arranged in accordance with the construction sequence, the transport conditions and the construction organization design, in order to reduce secondary handling; e) precision equipment and its components shall be well protected and shall be stored in accordance with the requirements of their storage class; f) equipment of special materials and its components, as well as pipes, pipe fittings and pipe accessories, shall be clearly identified, stored by categories and not mixed; g) for equipment protected by nitrogen filling, the nitrogen pressure and the tightness of the equipment shall be checked periodically; when the pressure is lower than the value required by the manufacturer (or lower than 3.5 kPa where the manufacturer has not stated a clear requirement), nitrogen shall be replenished in good time; h) the spare parts, accessories and special tools supplied with the equipment shall be inventoried, inspected and properly stored.

4.2.2.2 The personnel in charge of equipment storage shall be familiar with the equipment storage procedures and with the special storage requirements of the equipment of the turbine generator unit. The preservation and maintenance during the warehousing stage of the equipment shall be carried out by preparing a preservation and maintenance plan on the basis of the technical requirements of the manufacturer for equipment storage and preservation (including conditions, methods, materials, tools, and preservation and maintenance intervals), and preservation and maintenance shall be implemented and recorded.

4.2.3 In addition to the relevant provisions of NB/T 20117, NB/T 20119 and DL 5009.1, the unloading, hoisting and transport of the equipment delivered shall also comply with the following requirements: a) when hoisting, the slings shall be tied at the lifting points indicated on the equipment or on the packing case, and padding shall be added where the slings bear against the edges and corners of the lifted object, in order to prevent damage to the equipment and to the slings; b) before the equipment or packing cases are loaded, hoisted and transported, it shall be confirmed that the load, the center of gravity and the lifting and lashing points of the equipment meet the design requirements; the movable parts on the equipment shall be secured, and liquid stored inside the equipment or the packing case shall not affect the deviation of the center of gravity, so that overturning is prevented; c) for equipment of low rigidity, the necessary measures shall be adopted to prevent deformation; d) the bearing capacity and the clearance dimensions of the roads, tunnels, bridges and similar structures along the transport route of the equipment or packing cases shall be verified and shall all satisfy the transport requirements; where necessary, a design assessment shall be carried out and the corresponding measures shall be adopted, so that accidents such as overturning or collapse are prevented; e) carbon steel lifting lugs and slings shall not come into direct contact with equipment or components of stainless steel material.

4.3 Professional coordination and interface work between installation and civil construction.

4.3.1 The professional coordination work between installation and civil construction: a) the cross disciplinary drawings of installation and civil construction shall be jointly reviewed, and cross disciplinary design clarification and construction technical clarification shall be carried out; the consistency of the relevant design standards and process requirements at the interface positions between the two disciplines, as well as the feasibility of the processes, shall be confirmed; the technical points of attention of both parties and the key points and difficulties of the construction processes shall be made clear; b) for the base of the turbine generator unit, as well as for the foundations of the main auxiliary equipment and of the attached machinery, during their construction preparation stage the foundation elevations, the longitudinal and transverse center lines, the various openings, the embedded parts and the positions of the anchor bolt holes which are directly related to the installation shall be jointly verified and confirmed with the civil discipline and shall be consistent with the installation requirements; c) on the base of the turbine generator unit, for the through type (or similar through type) anchor bolts, the anchorage seats (key seats) and the valve seat structural embedded parts directly related to the installation of the main equipment, the installation discipline shall, as required, take part in the final acceptance work before concrete placing and shall take part in the monitoring throughout the concrete placing; d) for the lifting schemes of heavy equipment, and where there are special load requirements on the foundations, on the anchorage points and on the buildings (structures), the installation discipline shall put forward the technical requirements to the civil design and civil construction disciplines.

4.3.2 The base of the turbine generator unit and the foundations of the auxiliary equipment and of the attached machinery handed over by civil construction to installation shall have been accepted as qualified and shall be accompanied by the following technical documents: a) the acceptance records of the equipment foundations and of the buildings (structures); b) the concrete strength test records; c) the records of the reference lines and reference points on the buildings and on the foundations, and the corresponding records; d) the settlement observation records; e) the pre-compression records and installation records of the elastic foundation vibration isolators.

4.3.3 Before the installation of the equipment of the turbine generator unit, the buildings (structures) handed over by civil construction to installation shall meet the following conditions: a) the construction of the crane runway beams has been completed and they have passed acceptance; b) the concrete of the equipment foundations and bases has reached 75% or more of the design strength, the formwork has been removed and acceptance has been passed; c) the longitudinal and transverse center lines and the elevation references on the equipment foundations and bases are clear, complete and accurate; d) the trenches inside the plant, the first floor and the roads leading into the plant meet the requirements for bringing in the equipment; e) the plant building is enclosed and the roof is watertight; f) the formwork, scaffolding, surplus materials, rubbish and refuse from civil construction inside the installation area have been completely cleared away; g) the platforms, ladders and handrails are reliably fitted and the covers or guard rails of the openings are reliably fixed; h) the pipe trenches, drainage ditches, pump pits and sumps have been cleaned and the drainage is unobstructed; i) the fire fighting facilities are available and meet the fire protection requirements of the working area; j) after installation has started, effective protective measures for the equipment shall be adopted during the subsequent civil construction work.

4.4 Equipment installation.

4.4.1 The installation of equipment shall be provided with the following technical documents: a) the technical documents of the manufacturer; b) the design documents relevant to installation; c) the documents of the installation related working procedure category.

4.4.2 The installation technical personnel and the construction personnel shall have been trained, shall have passed the examination and shall be authorized in accordance with the management requirements.

4.4.3 The installation technical personnel and the construction personnel shall be familiar with the construction drawings and the relevant technical documents, and before construction a full technical clarification shall be given to all the operating personnel and recorded.

4.4.4 The construction site shall be rationally laid out in accordance with the construction organization design and shall meet the following requirements: a) the areas and platforms where equipment and materials are placed, as well as the transport passages, shall all meet the relevant load requirements, and turnaround areas for equipment and materials shall be provided; b) the ambient temperature of the construction site should be kept above 5 degrees C; when the air temperature is lower than 0 degrees C, cold protection and antifreeze measures shall be taken as required; c) the equipment transport passages and the safety passages shall be unobstructed; d) the arrangement of the safety facilities and the fire fighting facilities of the construction site, as well as the supply of water, electricity, compressed air, oxygen, acetylene and lighting, shall meet the construction requirements and shall comply with the relevant management provisions; e) the storage and use of flammable, explosive and corrosive dangerous chemicals and of radioactive sources shall comply with the relevant safety management provisions; f) effective isolation measures shall be adopted between the construction area of the capital works and the production and operation area, and clear identification shall be provided.

4.4.5 In addition to complying with the national provisions on the safety supervision of special equipment and with the relevant provisions of GB/T 6067.1, GB/T 6067.5, GB/T 23723 (all parts), GB/T 23724 (all parts) and TSG 08, the use and management of lifting and transport machinery shall also comply with the following requirements: a) periodic inspection shall be carried out as required, and it shall be confirmed that the hoisting load, the height, the speed, the extreme range of longitudinal and transverse travel, the lifting mechanism and other performances and parameters of the cranes are satisfied and that the requirements for equipment installation and use are met; b) hoisting of equipment beyond the rated limits shall be the subject of a specific technical demonstration; a specific scheme shall be prepared and shall be implemented after examination and approval; c) whenever building structures are used to hoist heavy items, the structural strength shall be verified by calculation and the consent of the design organization shall be obtained; d) when equipment, materials and other items are hoisted, suspended or stored using lifting machinery or building structures, if the load of the items is not clear or the strength of the building structure is not clear, so that it cannot be determined whether the strength of the lifting machinery or of the building structure can satisfy the safety requirements, hoisting, suspension or storage operations shall not be carried out.

4.4.6 During the installation of equipment, the protection of the buildings (structures) related to the working area shall comply with the following requirements: a) the structures of the buildings (structures) shall not be damaged or altered at will; when a change is unavoidable, the civil discipline shall be contacted for professional treatment; b) welding, cutting or drilling shall not be carried out at will on the structures of the buildings (structures); when welding, cutting or drilling is unavoidable, the civil discipline shall be contacted for professional treatment; c) it is not permitted to strike the building concrete structures with a sledge hammer or to chisel away the protective layer and then weld or cut the reinforcement inside the building concrete structures; when such treatment is unavoidable, the civil discipline shall be contacted for professional treatment; d) where the bearing strength of the equipment loads or of the building (structure) structures is not clear, it is forbidden to place equipment or other items at will on the structures of the buildings (structures); e) on finished floors, walls and similar surfaces, when equipment, components, metallic materials or other hard items are placed on them, or when scaffolding is erected, soft materials shall be used for lining and protection.

4.4.7 The construction site, the equipment and the machinery and tools shall be kept clean and tidy.

4.4.8 During installation, the equipment and its components shall be cleaned and inspected, and the following requirements shall be complied with: a) the equipment and its components shall be cleaned and shall be free of oil stains, free of rust (corrosion) and free of foreign matter; b) the cleaning and rust removal of the finish machined surfaces of the equipment and of its components shall be carried out in accordance with the provisions of the manufacturer or with an approved scheme; scrapers and files shall not be used for rust removal, and flame rust removal shall not be used; c) components washed with steam shall have the residual moisture from the washing removed in good time; d) the journals, bearings and other machined surfaces shall not be damaged or contaminated, treading is strictly forbidden, and reliable protective measures shall be taken; e) after cleaning, the equipment and its components shall be stored according to category, material and type, so that contamination is avoided.

4.4.9 The installation work shall comply with the following requirements: a) before installation, the complete equipment or the equipment components shall be inspected in accordance with the relevant provisions; if it is found that the specification or quantity does not conform, or that quality defects exist, the relevant units shall be notified in good time for joint inspection and confirmation and the treatment shall be carried out as prescribed; b) components and fasteners made of alloy steel or of special materials shall, before installation, undergo spectroscopic analysis, hardness testing, non destructive examination and other inspection work in accordance with the relevant provisions of NB/T 25017, and shall comply with the relevant standards; c) the construction materials shall all have certificates of conformity or other valid quality certificates and shall be inspected and tested as required; d) finished or semi finished items machined externally or prefabricated on site shall be inspected in accordance with the requirements of this part and of the relevant provisions and may be used only after having been found acceptable; e) when the manufacturer requires the equipment to be disassembled for inspection and reassembled, the intervention formalities shall be completed as required and the construction party shall provide good on site cooperation; f) for the equipment and its components and for piping, their drilling and welding shall be coordinated with the relevant disciplines and shall be carried out in accordance with the relevant provisions and the design requirements; g) the protection of the finished work of the equipment already installed shall be reinforced, so that damage, breakage, loss or absence of the equipment is avoided.

4.4.10 The pressure tests of the equipment and of the piping of the turbine generator unit shall be carried out in accordance with the design requirements and shall be found acceptable at inspection. During the pressure test the system shall be tight and free of leakage, and the accuracy grade of the measuring instruments shall meet the requirements and shall have passed calibration. When a hydrostatic test is used, the water quality shall meet the requirements, the air shall be exhausted before pressurization of the hydrostatic test, and after the hydrostatic test the residual water shall be drained and blow drying shall be carried out by ventilation or by other means; when a pneumatic test is used, the gas source shall meet the design requirements and shall be dry, clean and oil free.

4.4.11 The inspection of the key working procedures for the closing of equipment and piping shall comply with the following requirements: a) all personnel entering the inside of equipment and piping shall wear special working clothes and working shoes; the items taken inside the equipment and the piping shall be registered, and no foreign matter shall be left inside the equipment or the piping; b) the temporary closing of equipment and piping shall be evident and firm, and shall be identified and recorded; c) before the formal closing of equipment and piping, all the relevant disciplines shall confirm that all the work has been completed; a joint inspection shall be carried out and it shall be confirmed that there is no foreign matter, after which formal closing may take place; d) when welding, drilling or dismantling is carried out on equipment or piping already formally closed, it shall be performed after the examination and approval formalities have been completed in accordance with the relevant provisions, and the execution process shall be supervised by a designated person and recorded; after completion of the work, re-inspection shall be carried out and, after conformity with the requirements has been confirmed, formal closing shall be carried out again.

5 Steam turbine proper

5.1 General requirements.

5.1.1 In addition to complying with the relevant requirements of 4.2.3, the hoisting and transport of the equipment of the steam turbine proper shall also comply with the following requirements: a) before hoisting and transporting the complete equipment supplied by the manufacturer, it shall be confirmed that the load, the center of gravity and the lifting and lashing points of the equipment all meet the design requirements; b) for hoisting cylinders, rotors and similar equipment, the lifting beams, slings and other special tools supplied by the manufacturer shall be used; the condition of the special tools shall be intact and shall satisfy the hoisting requirements; the lifting beams, slings and other special tools shall be properly stored during the periods in which they are not used, so that damp, rust (corrosion) and damage are prevented. If the manufacturer has not supplied special tools, hoisting tools complying with the technical documents supplied by the manufacturer and with the relevant safety provisions shall be adopted; c) when hoisting the cylinders and similar equipment, the lifting height and the levelness of the equipment shall comply with the design requirements of the manufacturer; d) when placing the rotor into the cylinder or lifting the rotor out of the cylinder, the longitudinal lifting height at the measuring journal shall be measured and adjusted so that it is close to the longitudinal lifting height value of the journal after the rotor has been seated; at the same time, an appropriate axial clearance shall be maintained between the rotor and the internal components of the cylinder and measures shall be taken to prevent abnormal swaying and jerking of the rotor, so that the rotor can be hoisted and placed smoothly.

5.1.2 In addition to the design requirements of the manufacturer and the relevant requirements of 4.2.2, the site storage of the equipment of the steam turbine proper shall also comply with the following requirements: a) large items such as cylinders and rotors shall have their placing positions confirmed in accordance with the load distribution drawing of the placing area supplied by the design, and the load shall comply with the design requirements; b) the working areas for the installation of the equipment of the steam turbine proper shall be planned, work control areas shall be established and standardized management shall be implemented; c) important equipment components such as cylinders, rotors, diaphragms and bearings shall be stored separately by category and by zone, shall be clearly identified, and dust proof, rust (corrosion) proof and impact proof measures shall be adopted; d) the threads of bolts and other fasteners, as well as keys and pins, shall all be properly protected against damage.

5.1.3 In the cleaning and inspection of the external appearance of the cylinders, rotors and other equipment and of their components, there shall be no damage, no cracks, no overlaps, no weld beads, no blowholes, no sand inclusions and no slag inclusions; the joint faces, the sliding bearing surfaces, the flanges, the grooves and other finish machined surfaces shall all be smooth and free of rust (corrosion), of dirt, of burrs and of damage; the anti-corrosion layer shall be cleaned off in accordance with the requirements of the manufacturer; the rotors, the cylinders and other equipment and their components shall be cleaned and kept clean.

5.1.4 Before the cylinder is set in position, the equipment and piping installed between the cylinder and the foundation shall be installed in advance or pre-stored in accordance with the requirements of the technical documents, so that construction which would be impossible after the cylinder has been set in position is prevented.

5.1.5 During the whole process of steam turbine installation and after the closing of the cylinder (fitting of the cover), the equipment and the piping shall not be forcibly connected to the steam turbine equipment and no additional loads exceeding the design requirements shall be applied to the steam turbine.

5.1.6 The installation sequence of the steam turbine proper shall comply with the provisions of the manufacturer and with the design requirements, and shall be implemented after approval.

5.2 Foundation of the turbine proper.

5.2.1 When the foundation of the turbine proper is handed over for installation, in addition to complying with the relevant requirements of 4.3.2 and 4.3.3, it shall also meet the following conditions: a) the various geometrical dimensions of the foundation, the longitudinal and transverse centers, the elevations and the corresponding deviations shall all comply with the design requirements, and the deviation should normally not be greater than 10 mm; b) the concrete surface of the foundation shall be flat, without cracks, cavities, honeycombing, pitting or exposed reinforcement or other defects; c) the plastering and the finishing shall comply with the design requirements and there shall be no spalling and no powdering; d) the settlement observation of the foundation shall comply with the design requirements and an observation report shall be available; there shall be no anomalies affecting the leveling, the alignment and the centering of the equipment of the unit; e) the longitudinal and transverse center lines of the foundation of the turbine generator unit shall all be complete, accurate and clear, and the deviation of the center lines shall comply with the design requirements; the longitudinal center line and the transverse center line shall be perpendicular; f) the positions of the various structures and openings of the foundation shall be correct, and their longitudinal and transverse centers and their elevations shall comply with the design requirements; for the equipment openings in the upper structure of the foundation, the correspondence between the center of the opening and the center of the related foundation or equipment below it shall be verified where necessary; the connection of the equipment (components) above and below shall not be affected, and the thermal expansion clearance requirements of the equipment (components) shall not be affected; g) the longitudinal and transverse centers, the elevations and the sectional geometrical dimensions of the cantilever beams of the foundation shall all comply with the design requirements; h) the sectional geometrical dimensions, the longitudinal and transverse centers, the elevations and the slopes of the various trenches and pits shall all comply with the design requirements, and the bottoms of the trenches or pits shall be clean and free of foreign matter; i) the positions of the embedded parts shall be correct and comply with the design requirements; the longitudinal and transverse center lines and the elevations of the embedded longitudinal and transverse keys (anchorage seats) shall all comply with the design requirements, and where the design has not stated clear requirements they shall be clarified; j) the inside of the through type anchor bolt holes shall be thoroughly cleaned, the holes shall be unobstructed and free of transverse reinforcement and of foreign matter; the deviation of the center line of the bolt holes with respect to the center line of the foundation shall comply with the design requirements; where the design has not stated clear requirements, the deviation should not be greater than 0.1d (d being the inside diameter of the embedded steel sleeve) and shall be less than 10 mm; the deviation of perpendicularity of the wall of the bolt holes should not be greater than L/200 (L being the length of the embedded steel sleeve or of the anchor bolt) and shall be less than 10 mm; the concrete surface where the anchor bolt bearing plates rest shall be flat, and the holes where the bearing plates are placed shall have sufficient space for the plates to be fitted; k) for directly embedded anchor bolts and iron parts, their material, specification and quantity shall comply with the design requirements; the longitudinal and transverse center lines, the elevations and the verticality or levelness of the anchor bolts and iron parts shall all comply with the design requirements; where the design has not stated clear requirements, these shall be clarified, and the elevation of the anchor bolts shall take into account the influence of the lifting height of the shafting of the unit; l) the isolation joint gaps between the foundation and the related platforms shall be cleaned and free of foreign matter, and covers or filling material shall be fitted in the gaps as required.

5.2.2 The settlement of the foundation shall be observed in coordination with the relevant working procedures in the following conditions (including but not limited to): a) before the installation of the turbine generator unit (the values measured on this occasion are taken as the original reference data); b) before and after all the cylinders of the steam turbine and the stator of the generator have been set in position; c) before and after the final alignment of the shafting; d) before and after the secondary grouting of the steam turbine foundation and of the generator foundation; e) before the trial operation of the complete equipment.

5.2.3 For elastic vibration isolated foundations, the condition of the elastic vibration isolators shall be checked and the spring heights shall be measured as required during the installation period in the following conditions: a) before the installation of the turbine generator unit (the values measured on this occasion are taken as the original reference data); b) after all the cylinders of the steam turbine have been installed; c) after the stator of the generator has been set in position; d) after all the equipment of the generator has been installed; e) before and after the release of the springs of the vibration isolators; f) before and after the final alignment of the shafting; g) before and after the connection between the low pressure cylinder and the condenser; h) before the connection of the rotor couplings of the turbine generator unit.

5.3 Sole plates, shims and anchor bolts.

5.3.1 The preparation work of the foundation of the turbine generator unit shall comply with the following requirements: a) the main dimensions of the foundation shall be checked against the actual dimensions of the equipment, and the foundation dimensions shall satisfy the installation requirements; b) the contact surface between the foundation concrete and the secondary grouting concrete shall be freed from the laitance layer and a fresh roughened surface shall be chiseled out, and the oil dirt penetrated into the foundation shall be thoroughly cleaned off; c) the foundation surface where the shims are to be placed shall be freed from the laitance layer and a fresh roughened surface shall be chiseled out; d) the adjusting jack screws or the temporary shim points shall be flat with respect to the foundation surface.

5.3.2 For turbine generator units using concrete bedding blocks, the concrete bedding blocks shall comply with the design requirements; where clear requirements are not stated, they shall be executed in accordance with the requirements of Annex A.

5.3.3 The fitting of the shims (shim assemblies) shall comply with the following requirements: a) each pile of shims (excluding embedded shims) should normally not exceed three pieces; in special cases up to five pieces are permitted, of which only one pair of inclined shims (counted as two pieces) is permitted; the mutually offset area of two inclined shims should not exceed 25% of the contact area of those shims; after the installation of the shims has been completed and the equipment has been finally positioned, the sides of each pile of shims shall be spot welded firmly; b) the contact of the shims (shim assemblies) with the foundation shall be uniform, close and tight, with no rocking at the four corners; the contact area shall comply with the design requirements; where clear requirements are not stated, the area of the contact points per square centimeter shall be not less than 75% of the total contact area of the shims; c) the contact between the equipment base or the sole plate and the shims, as well as between the layers of shims, shall be tight and close; a feeler gauge of 0.05 mm is usually used for the inspection and shall not enter. Where local insertion occurs, the length of the range in which insertion is possible shall not be greater than one quarter of the length of that side of the shim, and the depth shall not be greater than one quarter of the length of that side of the shim; d) the longitudinal and transverse centers, the elevations, the levelness and the corresponding deviations of the fitted shims (shim assemblies) shall all comply with the requirements of the manufacturer. Where the manufacturer has not stated clear requirements, the deviation of the longitudinal and transverse centers of the shims (shim assemblies) should not be greater than 1 mm, the elevation deviation of the shims (shim assemblies) shall be from minus 2 mm to 0 mm, and the levelness of the shims (shim assemblies) shall correspond to the lifting height of the shafting; e) where embedded shims are used, the thickness of the grouting layer from the bottom of the embedded shims to the chiseled roughened surface of the foundation shall comply with the design requirements of the manufacturer; the elevation of the embedded shims along the longitudinal axis of the turbine generator unit shall be such that the elevation difference of the journals complies with the design requirements of the manufacturer. Where the manufacturer has not stated clear requirements, the thickness of the grouting layer from the bottom of the shims to the chiseled roughened surface of the foundation should be from 20 mm to 50 mm. After the pre-embedding of the shims has been completed, the final elevation shall satisfy the design requirements (see Figure 1). The material for grouting during the construction of the embedded shims shall be a non shrink grouting material, and test blocks under identical conditions shall be prepared as prescribed; f) where adjustable shim assemblies are used, the contact faces and sliding faces of the adjustable shim assemblies shall all be flat, smooth, free of burrs and free of damage; the thickness of the grouting layer from the bottom of the adjustable shim assemblies to the chiseled roughened surface of the foundation and the grouting material shall comply with the requirements of the manufacturer; where clear requirements are not stated, they may be executed with reference to the relevant requirements of item e) of 5.3.3. Where adjustable shim assemblies supported by embedded plates are used, the contact with the embedded plates shall comply with the requirements of the manufacturer; where clear requirements are not stated, the contact between the shim assemblies and the embedded plates shall be uniform and tight, the area of the contact points per square centimeter shall account for not less than 75% of the total contact area, and there shall be no rocking at the four corners; g) where adjustable shim assemblies are used to support bearing pedestals, cylinders and similar items, the mating parts in contact between the adjustable shim assemblies and the bearing pedestals, the cylinders and similar items shall be in tight contact and shall comply with the requirements of the manufacturer; h) the fitting of shop made shims shall comply with the design requirements; where clear requirements are not stated, it shall comply with the following requirements: 1) shop made shims shall be of steel material; 2) the thickness of the flat shims used for embedding should be 20 mm or more; the thin edge thickness of inclined shims shall not be less than 10 mm and the inclination should be from 1 in 10 to 1 in 25; 3) shop made shims shall be flat and free of burrs; the four edges of the plane shall have a 45 degree chamfer; the surface roughness (Ra) after machining of the plane should not be greater than 6.3; the contact of the shims shall be uniform; a feeler gauge of 0.05 mm is used for the inspection and shall not enter; where local insertion occurs, a feeler gauge of 0.05 mm is generally used for the inspection, the length of the range in which insertion is possible shall not be greater than one quarter of the length of that side of the shim, the depth shall not be greater than one quarter of the length of that side of the shim, and the shims shall not rock; 4) shop made shims shall be arranged at the places where the loads are concentrated, on both sides of the anchor bolts, at the four corners of the sole plates and at the stiffening rib positions of the sole plates, where the shims shall be suitably increased; the distance between two adjacent piles of shims should be from 300 mm to 700 mm; 5) the static load on shop made shims shall not exceed 4 MPa; 6) after the formal installation of the shop made shims has been completed, a shim arrangement drawing shall be prepared according to the actual conditions and recorded.

5.3.4 For units in which the elevation of the equipment is adjusted by means of adjusting bolts and supporting bedplates, the installation of the supporting bedplates shall comply with the design requirements of the manufacturer; where clear requirements are not stated, the installation position and the levelness of the supporting bedplates shall satisfy the needs of the installation and adjustment of the equipment.

5.3.5 The inspection and installation of the sole plates shall comply with the following requirements: a) the material, specification and quantity of the sole plates shall comply with the design requirements of the manufacturer; b) the longitudinal and transverse centers of the installed sole plates, the transverse levelness of the elevation and the longitudinal lifting height shall all comply with the design requirements. Where clear requirements are not stated, the deviation of the longitudinal and transverse centers of the sole plates shall not be greater than 1 mm, the deviation of the elevation shall not be greater than 1 mm, and the deviation of the longitudinal and transverse center lines of the bolt holes of the sole plates shall not be greater than 2 mm; c) the sliding surfaces of the sole plates shall be flat, smooth and free of burrs; the surfaces of the joining parts between the sole plates and the secondary grouting concrete shall be clean, free of oil paint and free of dirt; d) the parts where the sole plates mate with the bearing pedestals, the sliding blocks, the cylinders and similar items shall be in close contact; the contact area shall be not less than 75% and shall be uniformly distributed; on the four sides of the contact face a feeler gauge of 0.05 mm shall be used for the inspection and shall not enter; e) at the positions where formwork cannot be set for the secondary grouting, baffle plates shall be installed on the inner side of the foundation before the sole plates are set in position; the baffle plates shall not affect the expansion of the cylinders and of the related piping; f) the distance between the underside of the sole plates and the surface of the foundation concrete shall comply with the design requirements of the manufacturer; where clear requirements are not stated, it should be from 50 mm to 80 mm; g) the openings and vent holes for the pouring of concrete, and the lubrication and oil filling holes between the contact faces of the sole plates and the bearing pedestals or the cylinders, shall all be unobstructed; h) after the connecting bolts between the bearing pedestals or the cylinders and the sole plates have been tightened as required by the design, the mating clearances between the shims of the connecting bolts and the bearing pedestals or the cylinders, and the mating clearances between the connecting bolts and the bolt holes of the cylinders or of the bearing pedestals, shall all comply with the design requirements.

5.3.6 The inspection and installation of the anchor bolts shall comply with the following requirements: a) the material, specification and quantity of the anchor bolts, of the nuts and of their washers and pads shall all comply with the design requirements; b) the external appearance shall be free of damage, free of rust (corrosion), free of oil paint and free of dirt; c) the threads of the nuts and of the bolts shall be smooth, free of burrs, free of damage, free of cracks and free of rust (corrosion), and shall fit well without seizing; d) the anchor bolts shall all pass through the bolt holes as required; the clearance all around between the bolt and the bolt hole or the bolt sleeve shall comply with the design requirements; where the design has not stated clear requirements, it shall be not less than 5.0 mm and shall satisfy the expansion requirements of the equipment; e) the verticality of the anchor bolts shall comply with the design requirements; f) the bearing plates at the lower end of the through type anchor bolts shall be placed flat and shall be in close contact with the foundation, and the nuts shall be fixed in accordance with the design requirements; g) the fasteners such as the anchor bolts shall be formally tightened after the final positioning of the cylinders and the final alignment of the shafting; the fitting, tightening and fixing of the fasteners such as the anchor bolts shall all comply with the design requirements, the tightening shall be uniform, the fixing shall be firm, and the tightening torque or the elongation of the bolts shall be recorded; after the fasteners such as the anchor bolts have been tightened, the sliding contact faces between the sole plates and the bearing pedestals, the sliding contact faces between the sole plates and the cylinders, the faces between the sole plates and the shims and between the layers of shims, and the sliding contact faces between the adjustable shim assemblies and the bearing pedestals or the cylinders, shall all be in tight and close contact; a feeler gauge of 0.05 mm is used for the inspection and shall not enter. Where local insertion occurs, the length of the range in which insertion is possible shall not be greater than one quarter of the length of that side of the shim (shim assembly) and the depth shall not be greater than one quarter of the length of that side of the shim (shim assembly); h) where the anchor bolts are fitted with washers, the contact condition or the assembly clearance of the mating faces between the washers and the sole plates or the cylinders shall comply with the design requirements.

5.4 Cylinders, bearing pedestals and sliding pin system.

5.4.1 The inspection before the installation of the cylinders shall comply with the following requirements: a) the material, specification and quantity of the cylinders and of their components shall comply with the requirements of the manufacturer; b) the misalignment of the adjacent horizontal joint faces of a sectionalized cylinder at the vertical joining parts, as well as the deviation of the center of the two adjacent interface planes in the horizontal direction, shall comply with the requirements of the manufacturer and shall be recorded; c) for the horizontal and vertical joint faces of cylinders on which a coating is used at the time of final assembly, the inspection shall be carried out in the condition in which no coating has been applied to the joint face and shall comply with the design requirements of the manufacturer; where clear requirements are not stated, the requirements of Table 1 shall be satisfied; d) the grooves of the vertical faces and of the horizontal joint faces of the cylinders which are filled with sealing material shall be clean and unobstructed; e) where gaskets or sealing rings are not used for the flange sealing faces of the pipe connections of the cylinders, a coating check shall be carried out, and the sealing faces shall be in continuous contact over their whole circumference and the contact width shall comply with the requirements; f) the mating clearance between the tightening bolts of the horizontal joint faces of the cylinders and the bolt holes shall comply with the design requirements. Where the design has not stated clear requirements, the mating clearance all around between the tightening bolts and the bolt holes shall be not less than 0.5 mm, so that the expansion requirements of the bolts are satisfied; the mating clearances between the connecting bolts of the cylinder claws and their bolt holes, and between the cylinder claws and the shims of their connecting bolts or the anti-lifting devices, shall all comply with the design requirements.

Table 1 gives the inspection requirements for the joint faces of the cylinders. For the high pressure cylinder, the type of joint face considered is the horizontal joint face: when the joint face is tightened according to the cold tightening requirements, one third of the tightening fasteners of the joint face shall be tightened and the feeler gauge check shall then meet the requirements. For the intermediate pressure cylinder, the types of joint face considered are the vertical and horizontal joint faces: generally a feeler gauge of 0.05 mm shall be used to check both the inner and the outer sides of the joint face and shall not enter; where local insertion occurs, the locally inserted portion shall not exceed one third of the sealing face width of the cylinder flange. For the low pressure cylinder, the types of joint face considered are the vertical and horizontal joint faces: the check is made with a feeler gauge of 0.05 mm, the clearance shall not run through, and at the same joint of the cylinder flange the total insertion length from the inner and outer sides shall not exceed one third of the width of the cylinder flange.