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NB/T 47044-2014Power station valves (English PDF)

电站阀门

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

June 29, 2014

Implementation date

November 1, 2014

Scope

NB/T 47044-2014 is the English-translated version of 电站阀门.

NB/T 47044-2014 is the Chinese standard "Power station valves".

Its scope clause reads: This standard specifies the requirements for valves for power station in terms of pressure-temperature ratings, general requirements, ordering requirements, design and manufacture, materials, welding, heat treatment, repair, inspection, testing, marking, painting, delivery, packaging, delivery documents, valve installation and commissioning, quality assurance, environmental protection, etc. This standard applies to the design, manufacture and acceptance of cast, forged and fabricated valves with flanged, threaded and welding end connections.

It covers steel valves and nickel-based alloy valves for thermal power generating units, such as globe valves, gate valves, isolation valves, check valves, safety valves, relief valves, control valves, pressure reducing valves, steam converting valves, throttle valves, feed distribution valves, blow-down valves, quick opening and closing valves, butterfly valves, ball valves, circulating pump outlet valves, blocking valves, high-pressure heater three-way valves, and extraction check valves, applicable to ultra (super) critical and lower parameter conditions. a) PN designation: - - Nominal pressure <= 80MPa; maximum working temperature <= 430°C; - - Working pressure <= 35MPa; maximum working temperature <= 625°C; - - Working pressure <= 8MPa; maximum working temperature <= 648°C. b) Class designation: - - Pressure classes ranging from Class 150 to Class 4500.

This standard may also be referenced for valves applied to units with alternative steam parameters, industrial boilers, heat recovery boilers and other special equipment.

Its clauses include terms and definitions; order requirements; general requirements.

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Document preview — NB/T 47044-2014

National Standard of the People's Republic of China

ICS: 23.060
Replacing: JB/T 3595-2002

Issued by: National Energy Administration of the People's Republic of China

Foreword i
Introduction iv
1 Scope
2 Normative references
3 Terms and definitions
4 Order requirements
5 General requirements
6 Pressure-temperature rating
7 Design and manufacture
8 Materials
9 Welding
10 Heat treatment
11 Repair
12 Examination, inspection, and test
13 Marking
14 Painting, packaging, delivery, storage and transport
15 Delivery documents
16 Quality assurance
17 Environmental protection
18 Installation, commissioning and maintenance
Annex A (Informative) Valve ordering data sheet
Annex B (Normative) Unit conversion
Annex C (Normative) Pressure-temperature ratings of PN designated valves
Annex D (Normative) Pressure-temperature ratings of Class designated valves
Annex F (Informative) Parameters of boilers and steam turbines for power station
Annex G (Informative) Relationship between nominal size and valve inside diameter
Annex H (Normative) Basic equation for determination of minimum wall thickness
Annex I (Informative) Specifications for welding groove of body
Annex J (Informative) Face-to-face dimensions
Annex K (Normative) Temperature limit of pressure-containing part materials
Annex L (Informative) Overlay welding materials, hardness and welding methods for valve sealing faces
Annex M (Normative) Allowable stress of materials
Annex N (Informative) Average linear expansion coefficient and elastic modulus of metallic materials
Annex O (Informative) Material marking code
Annex P (Informative) Metal nameplate
Annex Q (Informative) Valve product certificate

1 Scope

1.1

This standard specifies the requirements for valves for power station in terms of pressure-temperature ratings, general requirements, ordering requirements, design and manufacture, materials, welding, heat treatment, repair, inspection, testing, marking, painting, delivery, packaging, delivery documents, valve installation and commissioning, quality assurance, environmental protection, etc.

1.2

This standard applies to the design, manufacture and acceptance of cast, forged and fabricated valves with flanged, threaded and welding end connections. It covers steel valves and nickel-based alloy valves for thermal power generating units, such as globe valves, gate valves, isolation valves, check valves, safety valves, relief valves, control valves, pressure reducing valves, steam converting valves, throttle valves, feed distribution valves, blow-down valves, quick opening and closing valves, butterfly valves, ball valves, circulating pump outlet valves, blocking valves, high-pressure heater three-way valves, and extraction check valves, applicable to ultra (super) critical and lower parameter conditions.

a) PN designation:

- - Nominal pressure <= 80MPa; maximum working temperature <= 430°C;

- - Working pressure <= 35MPa; maximum working temperature <= 625°C;

- - Working pressure <= 8MPa; maximum working temperature <= 648°C.

b) Class designation:

- - Pressure classes ranging from Class 150 to Class 4500.

1.3

This standard may also be referenced for valves applied to units with alternative steam parameters, industrial boilers, heat recovery boilers and other special equipment.

2 Normative references

The following referenced 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 any amendments) applies.

GB 150 (all parts) Pressure vessels

GB/T 152.4 Fasteners - Counterbores for hexagon bolts and nuts

GB/T 196 General purpose metric screw threads - Basic dimensions

GB/T 197 General purpose metric screw threads - Tolerances

GB/T 699 Quality carbon structural steels

GB/T 711 Hot-rolled quality carbon structural steel plates and wide strips

GB 713 Steel plates for boilers and pressure vessels

GB/T 984 Hardfacing electrodes for shielded metal arc welding

GB/T 1047 Pipework components - Definition and selection of DN (nominal size)

GB/T 1184 Geometrical tolerancing - Geometrical tolerance for features without individual tolerance indications

GB/T 1220 Stainless steel bars

GB/T 1221 Heat-resistant steel bars

GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications

GB/T 1972 Disc spring

GB/T 2100 Corrosion-resistant steel castings for general applications

GB/T 3077 Alloy structure steels

GB/T 4237 Hot rolled stainless steel plate, sheet and strip

GB/T 4622 (all parts) Spiral wound gaskets

GB/T 5796 (all parts) Trapezoidal screw threads

GB/T 6414 Castings - System of dimensional tolerances and machining allowances

GB/T 6567.4 Technical drawings - Graphical symbols for piping systems - Valves and control components

GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes

GB/T 7233.2 Steel castings - Ultrasonic examination - Part 2: Steel castings for highly stressed components

GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1: Parallel internal and taper external threads

GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads

GB/T 9113 Integral steel pipe flanges

GB/T 9124 Specification for steel pipe flanges

GB/T 9125 Fasteners for pipe flange joints

GB/T 10869 Control valves for power station

GB/T 11351 Mass tolerances for castings

GB/T 11354 Determination of nitrided case depth and metallographic microstructure examination for steel and iron parts

GB/T 12220 General purpose industrial valves - Marking

GB/T 12221 Metal valves - Face to face, end to end, center to face and center to end dimensions

GB/T 12222 Multi-turn valve actuator attachments

GB/T 12223 Part-turn valve actuator attachments

GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings

GB/T 12229 General purpose industrial valves - Specification of carbon steel castings

GB/T 12230 General purpose industrial valves - Specification of stainless steel castings

GB/T 12241 Safety valves - General requirements

GB/T 12243 Spring loaded safety valves

GB/T 12244 General requirements for pressure reducing valves

GB/T 12245 Methods of performance test for pressure reducing valves

GB/T 12246 Pilot operated pressure reducing valves

GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads

GB/T 13402 Large diameter steel pipe flanges

GB/T 15056 Evaluation method on cast surface roughness

GB/T 16253 Steel castings for pressure purposes

GB/T 17854 Stainless steel electrodes and fluxes for submerged arc welding

GB/T 19066 (all parts) Flexible graphite covered wave-serrated metal gaskets

GB/T 19675 (all parts) Flexible graphite gaskets reinforced with tanged metal sheet for pipe flanges

GB/T 21465 Terminology of valves

GB/T 21469 Machining allowances and tolerances for steel open die forgings on hammer - General requirement

GB/T 22652 Overlaying-welding procedure qualification for valves sealing face

GB/T 23934 Hot coiled helical compression springs - Technical specifications

GB/T 23935 Design of cylindrical helical springs

GB/T 24919 Installation, operation, maintenance of industrial valves - General requirements

GB/T 24922 Technical specifications of explosion-proof version electric valve actuators

GB/T 24923 Technical specifications of basic version electric valve actuators

GB/T 26480 Valve inspection and testing

GB/T 28270 Intelligent valve electric actuator

GB/T 29462 Isolation valve for power station

DL/T 439 The technical guide for high-temperature bolt of fossil-fired power plant

DL/T 641 Electric valve actuators for power plant

DL/T 746 Guide on selection of butterfly valves for power plant

DL/T 748.3 Guide of maintenance of boiler unit for thermal power station - Part 3: The maintenance of valves and steam-water system

DL/T 959 Guide of safety valves for power station boilers

JB/T 79 (all parts) Integral cast steel pipe flanges

JB/T 81 Slip-on-welding plate steel pipe flanges with male face

JB/T 82.1 Steel pipe welding neck flanges with male face

JB/T 82.2 Steel pipe welding neck flanges with male and female face

JB/T 106 Valves marking and paint

JB/T 2203 Center-to-face dimensions of spring loaded safety valve

JB/T 2205 Reducing pressure valve - Face-to-face dimensions

JB/T 2769 Components of valves - High pressure threaded flanges

JB/T 3168 (all parts) Alloy powder for welding

JB/T 4730.2 Nondestructive testing of pressure equipments - Part 2: Radiographic testing

JB/T 4730.3 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing

JB/T 4730.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing

JB/T 4730.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing

JB/T 5263 Specification for steel casting for power station valves

JB/T 6439 Methods of magnetic examination for valves

JB/T 6440 Methods of radiographic examination for steel castings valves

JB/T 6617 Specification of flexible graphite ring for valves

JB/T 6902 Methods for liquid penetrant examination of valves

JB/T 6903 Methods for ultrasonic examination of steel forging for valves

JB/T 7370 Flexible graphite braided packing

JB/T 7746 Compact steel valves

JB/T 7927 Valve cast steel visual quality requirements

JB/T 7928 General purpose industrial valves - Delivery specification

JB/T 8531 Specifications of manual valve actuators

JB/T 9624 Specification for safety valve of fossil power station

JB/T 9625 Specification for pressure retaining casting of boiler pipe fittings

JB/T 9626 Specification for boiler forging

NB/T 47008 Carbon and alloy steel forgings for pressure equipments

NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipments

NB/T 47014 Welding procedure qualification for pressure equipment

NB/T 47018 (all parts) Technical permission of welding materials for pressure equipment

NB/T 47028 Nickel and nickel alloy forgings for pressure vessels

NB/T 47033 Attemperating and pressure reducing devices

NB/T 47037 Methods for model compositing of power station valves

ASME B16.5-2013 Pipe flanges and flanged fittings NPS 1/2 through NPS 24 metric/inch standard

ASME B16.47-2011 Large diameter steel flanges NPS 26 through NPS 60 standard

ASTM A105/A105M-2012 Standard specification for carbon steel forgings for piping applications

ASTM A182/A182M-2013 Standard specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts for high-temperature service

ASTM A193/A193M-2011 Standard specification for alloy-steel and stainless steel bolting for high temperature or high pressure service and other special purpose applications

ASTM A194/A194M-2012 Standard specification for carbon and alloy steel nuts for bolts for high pressure or high temperature service, or both

ASTM A216/A216M-2008 Standard specification for steel castings, carbon, suitable for fusion welding, for high-temperature service

ASTM A217/A217M-2011 Standard specification for steel castings, martensitic stainless and alloy, for pressure-containing parts, suitable for high-temperature service

ASTM A240/A240M-2012 Standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications

ASTM A351/A351M-2012 Standard specification for castings, austenitic, for pressure-containing parts

ASTM A387/A387M-2010 Standard specification for pressure vessel plates, alloy steel, chromium-molybdenum

ASTM A515/A515M-2010 Standard specification for pressure vessel plates, carbon steel, for intermediate- and higher-temperature service

ASTM B424/B424M-2009 Standard specification for Ni-Fe-Cr-Mo-Cu alloy (UNS N08825 and UNS N08221) plate, sheet, and strip

ASTM B564/B564M-2011 Standard specification for nickel alloy forgings

ASTM B637/B637M-2012el Standard specification for precipitation-hardening and cold worked nickel alloy bars, forgings, and forging stock for moderate or high temperature service

EN 10028-2:2009 Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties

TSG D2001 Pressure pipe unit manufacture appraisal regulation

TSG D7002 Pressure piping components type test regulation

TSG ZF001 Safety technical supervision regulations for safety valves

TSG G0001 Boiler safety technical supervision administration regulation

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 21465 and the following apply.

3.1 pressure-temperature rating

maximum allowable working pressure, expressed in gauge pressure, at the specified working temperature for the selected materials, indicated by a pressure class

3.2 maximum allowable working pressure (MAWP)

maximum pressure (gauge pressure) that a valve can withstand at the specified design temperature, which is the initial pressure for overpressure limitation

3.3 bare maximum continuous pressure rating

rule for determining pressure-temperature ratings, which is the maximum pressure that a material can withstand at the specified temperature, including limitations on material stress

4 Order requirements

The order contract shall contain sufficient information for the manufacturer to define the valve types, design conditions and technical requirements, including at minimum pressure, temperature, nominal size and connection mode of the valves. PN designated valves shall be ordered by PN pressure class and DN, while Class designated valves shall be ordered by Class pressure class and NPS. The ordering of valves shall comply with the provisions of Annex A.

Where necessary, the relevant provisions in applicable European and American standards may be adopted as the special requirements of this standard and shall be incorporated into the order contract.

5 General requirements

5.1 Qualification

5.1.1

The valve manufacturer shall hold a manufacturing license for pressure piping components of special equipment.

5.1.2

Manufacturers of safety valves and electromagnetic relief valves shall hold a manufacturing license for safety accessories and safety protection devices of special equipment.

5.1.3

Personnel engaged in welding and nondestructive testing of pressure piping components of special equipment, as well as valve operation personnel and safety valve commissioning personnel, shall acquire corresponding qualification certificates for special equipment.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 122 pages — is available in the English PDF.

Referenced standards

Normative references

GB 150.1 · GB 150.2 · GB 150.3 · GB 150.4 · GB 713 · GB/T 57

Cited by

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NB/T 47037-2021|NB/T 47063-2017|GB/T 46814-2025|GB/T 10868-2018|GB/T 10869-2008|GB/T 22380.3-2019

Editions of NB/T 47044

Edition	Title	Revision	Status
NB/T 47044-2014	Power station valves	current edition	Current
JB/T 3595-2002	Power station valves	previous edition	Superseded

This page sells the current edition, NB/T 47044-2014. Earlier editions are listed for reference only.

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