NB/T 10341.1-2019Code for design of hoists for hydropower projects - Part 1: Code for design of fixed wire rope hoists (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 27.140, Chinese classification P 26.

It replaces DL/T 5167-2002, which is superseded.

This Code has been revised by the drafting group in accordance with the requirements of the Notice of the General Office of the National Development and Reform Commission on Issuing the 2006 Industry Standard Project Plan (Fa Gai Ban Gong Ye [2006] No. 1093), on the basis of extensive investigation and research, careful summing-up of practical experience, reference to the relevant domestic standards, and wide solicitation of opinions.

The main technical contents of this Code are: basic requirements, design principles and requirements, loads, materials, mechanical design, structural design, electrical design, and safety.

The main technical contents revised in this Code are as follows.

This Code replaces the contents relating to the design of fixed wire rope hoists contained in Code for Design of Hoists for Hydropower and Water Resources Projects DL/T 5167-2002.

Contents relating to the torque calculation of motors have been added.

Contents relating to safety brakes have been added.

Calculation of the starting time, the braking time and the acceleration and deceleration of the hoisting mechanism has been added.

Calculation of the maximum static working tension of the wire rope has been added.

Contents relating to drums with broken line rope grooves have been added.

Formulas for the calculation of allowable stresses used in structural calculation have been added.

A chapter entitled Safety has been added.

The principles governing the classification of the duty class of hoists have been adjusted.

The contents of the chapter Electrical Design have been adjusted.

The material requirements for structural members have been modified.

This Code is under the administration of the National Energy Administration. It is proposed by, and its routine administration is undertaken by, the General Institute of Hydropower and Water Resources Planning and Design (China Renewable Energy Engineering Institute). The Standardization Technical Committee for Hydraulic Metal Structures and Hoists of the energy industry is responsible for the interpretation of its specific technical contents.

Comments and suggestions arising during the implementation of this Code should be sent to the General Institute of Hydropower and Water Resources Planning and Design (address: No. 2 Beixiaojie, Liupukang, Xicheng District, Beijing; postcode 100120).

Chief development organization of this Code: PowerChina Zhongnan Engineering Corporation Limited.

Participating development organization of this Code: China Water Resources and Hydropower Jiajiang Hydraulic Machinery Co., Ltd.

Chief drafting staff of this Code: Chen Huichun, Yu Xiquan, Li Qijiang, Hu Caishi, Wang Hongfang, Yao Gang, Yuan Changsheng, Huang Wenli, Jiang Lixin, Guo Xihong, Wu Sigou, Gong Zhaohui, Fang Zuowei.

Chief review staff of this Code: Gong Jianxin, Lin Zhaohui, Chen Hong, Hu Baowen, Fang Hanmei, Yao Changjie, Chen Xia, Lu Wei, Li Lili, Zhao Fuxin, Wu Quanben, Luo Wenqiang, Liao Yongping, Liu Shuyu, Jin Xiaohua, Long Zhaohui, Yang Qinghua, Wu Xiaoning, Piao Ling, Li Shisheng.

Publication Notice

Announcement of the National Energy Administration of the People's Republic of China, No. 8 of 2019.

The National Energy Administration has approved 152 energy industry standards, including Operation and Maintenance Code for Excitation Systems of Small Hydro Generating Units (Annex 1), and 39 English versions of energy industry standards, including Code for Safe and Civilized Construction of Onshore Wind Power Projects (Annex 2). They are hereby issued.

Annexes: 1. Catalogue of industry standards; 2. Catalogue of English versions of industry standards.

Issued by the National Energy Administration on 30 December 2019.

In the catalogue of industry standards (Annex 1), serial number 16 lists standard number NB/T 10341.1-2019, standard title Code for Design of Hoists for Hydropower Projects - Part 1: Code for Design of Fixed Wire Rope Hoists, standard replaced DL/T 5167-2002, date of approval 2019-12-30, date of implementation 2020-07-01.

1 Scope

NB/T 10341.1-2019 is Part 1 of the Chinese design code for hoists on hydropower projects and covers fixed wire rope hoists, replacing DL/T 5167-2002. These are the electrically driven drum hoists mounted permanently above a gate slot that raise and lower spillway gates, intake gates, bulkheads and trashracks - machines that may stand idle for months and then must lift a loaded gate reliably, sometimes against an unbalanced head, sometimes in an emergency closure. The code sets the general provisions and the defined terms and symbols, then the basic requirements: the duty classification, the design loads including gate weight, friction, hydrodynamic down-pull and ice, the load combinations and the allowable safety factors. Design principles and requirements follow, covering the mechanical parts - drums, wire ropes and their sheaves, reducers, couplings, brakes with their redundancy, open gearing, shafts and bearings, and the connection to the gate - then the structural design of the frame and supports, and the electrical design with the motors, control, position and load indication, limit and overload protection, and the power supply. Safety devices, corrosion protection, lubrication, manufacture and installation tolerances, and the testing performed before handover complete the code, with seven appendices of calculation methods. It applies to gate hoists on hydropower projects in China.

1.0.1 This Code is formulated in order to standardize the design of fixed wire rope hoists for hydropower projects.

1.0.2 This Code is applicable to the design of electrically driven fixed wire rope hoists used in hydropower projects for operating gates or trash racks.

1.0.3 In addition to complying with this Code, the design of fixed wire rope hoists for hydropower projects shall also comply with the provisions of the relevant current national standards.

2 Terms

2.0.1 Fixed wire rope hoist: mechanical equipment fixedly installed above the gate opening and driven by an electric motor, in which the drum is rotated through a gear transmission so that the wire rope wound on the drum drives a running block or a wire rope sling up and down, thereby opening and closing a gate or a trash rack.

2.0.2 Incense coil hoist: a type of fixed wire rope hoist in which each wire rope is wound in superimposed layers within one vertical plane, shaped like an incense coil.

2.0.3 Lifting force: the load that has to be applied to the gate through the lifting appliance in order to open the gate.

2.0.4 Holding force: the load coming from the gate that is borne by the lifting appliance during the closing of the gate in order to control the lowering speed of the gate.

2.0.5 Supporting brake: a mechanical normally closed brake arranged on the high speed shaft of the reducer and used for braking and for stopping the machine.

2.0.6 Safety brake: a mechanical normally closed brake arranged on the drum assembly and performing a braking function.

2.0.7 Spiral groove drum: a drum in which the rope grooves of each pitch are distributed in the form of a helix.

2.0.8 Broken line groove drum: a drum in which the rope grooves of each pitch are distributed alternately, the grooves lying parallel to a plane perpendicular to the drum axis alternating with grooves lying at an angle to a plane perpendicular to the drum axis.

2.0.9 Closed gear transmission: a transmission in which all gear pairs of every stage between the motor and the drum shaft are inside a sealed housing and are well lubricated.

2.0.10 Duty class: the characteristic of a hoist determined by taking into account the variation of the load action, the degree of utilization of the working time, and the working nature of the gate.

3 Basic requirements

3.0.1 The mechanism utilization class of a hoist shall comply with the provisions of Table 3.0.1-1; the load state of the mechanism of a hoist shall comply with the provisions of Table 3.0.1-2; the duty class of a hoist shall comply with the provisions of Table 3.0.1-3; and the duty class of hoists operating gates of different types should comply with the provisions of Table 3.0.1-4.

Table 3.0.1-1 Mechanism utilization classes: utilization class T1, total design working hours 800 h, remark: infrequently used.

Table 3.0.1-1 Mechanism utilization classes: utilization class T2, total design working hours 1 600 h, remark: infrequently used.

Table 3.0.1-1 Mechanism utilization classes: utilization class T3, total design working hours 3 200 h, remark: moderately used.

Table 3.0.1-1 Mechanism utilization classes: utilization class T4, total design working hours 6 300 h, remark: frequently used.

Table 3.0.1-2 Load states of the mechanism: load state L1, description: the maximum working load is seldom lifted, light loads are generally lifted.

Table 3.0.1-2 Load states of the mechanism: load state L2, description: the maximum working load is lifted at times, medium loads are generally lifted.

Table 3.0.1-2 Load states of the mechanism: load state L3, description: the maximum working load is lifted frequently, relatively heavy loads are generally lifted.

Table 3.0.1-3 Duty classes: for load state L1, the duty class is Q1 for utilization classes T1, T2 and T3, and Q2 for utilization class T4.

Table 3.0.1-3 Duty classes: for load state L2, the duty class is Q1 for utilization classes T1 and T2, Q2 for utilization class T3, and Q3 for utilization class T4.

Table 3.0.1-3 Duty classes: for load state L3, the duty class is Q1 for utilization class T1, Q2 for utilization class T2, Q3 for utilization class T3, and Q4 for utilization class T4.

Table 3.0.1-4 Duty classes of hoists operating gates of different types: maintenance gate with a lift H of less than 40 m, duty class Q1.

Table 3.0.1-4 Duty classes of hoists operating gates of different types: maintenance gate with a lift H of 40 m or more, duty class Q1 to Q2.

Table 3.0.1-4 Duty classes of hoists operating gates of different types: emergency gate with a lift H of less than 40 m, duty class Q2.

Table 3.0.1-4 Duty classes of hoists operating gates of different types: emergency gate with a lift H of 40 m or more, duty class Q2 to Q3.

Table 3.0.1-4 Duty classes of hoists operating gates of different types: service gate with a lift H of less than 40 m, duty class Q2 to Q3.

Table 3.0.1-4 Duty classes of hoists operating gates of different types: service gate with a lift H of 40 m or more, duty class Q3 to Q4.

3.0.2 The following data should mainly be collected for the design of a hoist.

3.0.2 item 1: the operating requirements for the gate, such as the mode of opening and closing and the mode of water filling.

3.0.2 item 2: the lifting force, the holding force, the lifting height, the gate opening speed, the gate closing speed, and the synchronization deviation between two lifting points.

3.0.2 item 3: the layout drawings of the hydraulic structures, the dimensions of the gate and of the gate slot, and the relevant dimensions and requirements for the connection between the gate and the hoist.

3.0.2 item 4: the requirements for the electric drive, the control mode and the interfaces.

3.0.2 item 5: data on environmental conditions such as hydrology, meteorology, sediment, water quality and altitude.

3.0.2 item 6: data on the dead weight of the gate, the tie rods, the balance beam and similar components.

3.0.2 item 7: the conditions and requirements relating to manufacture, transport and erection.

3.0.2 item 8: seismic data.

3.0.2 item 9: the requirements for the power supply, the emergency power supply and the control power supply.

3.0.2 item 10: the contract documents and other special requirements.

3.0.3 The selection of the series parameters of hoisting force, lift and hoisting speed should comply with the provisions of Appendix A of this Code.

3.0.4 A hoist shall be provided with safety protection devices and detection devices for the mechanical equipment, the electrical equipment and similar equipment; for important hoists, on-line monitoring devices should be provided.

3.0.5 According to its working environment, a hoist shall be provided with protective measures such as protection against high temperature, rain, icing and freezing, damp, corrosion, wind-blown sand and lightning, as well as ventilation and dehumidification.

3.0.6 The structural members of a hoist need not be subjected to fatigue strength calculation.

3.0.7 The transport units of a hoist should not exceed the limits on maximum overall dimensions and on the weight of the heaviest piece imposed by the transport regulations and by the site erection conditions, and shall possess the necessary rigidity.

3.0.8 A hoist working in an area with a seismic fortification intensity of degree VII or above shall be subjected to a seismic safety check calculation, and anti-seismic measures shall be adopted.

4 Design principles and requirements

4.0.1 The design of a hoist shall satisfy requirements such as safety and suitability for use, reliability in operation, technical advancement, economic rationality, convenience of maintenance, harmony with the landscape, occupational safety, energy saving and environmental protection, coordinated construction, and a friendly operating interface.

4.0.2 The type selection of a hoist shall be determined after comprehensive technical and economic demonstration, on the basis of the layout of the hydraulic structures, the type of gate, the number of openings, and the operating and time requirements, and should satisfy the following requirements.

4.0.2 item 1: the hoists for the service gates of the water release system and of the sediment flushing system should be arranged with one hoist for each gate; after comparison of machine types, fixed wire rope hoists may be selected.

4.0.2 item 2: for the hoists of emergency gates and maintenance gates where the number of openings is relatively small, fixed wire rope hoists may be selected after comparison of machine types.

4.0.2 item 3: for the hoists of the quick-acting gates at the water intakes of power station units, fixed wire rope hoists may be selected after comparison of machine types.

4.0.2 item 4: for the hoists of the closure gates used for construction diversion, fixed wire rope hoists should be selected.

4.0.3 A machine room should be provided for a fixed wire rope hoist. Maintenance space shall be left inside the machine room, and a walkway shall be left between the equipment and the walls, the width of which should be greater than 0.8 m; maintenance facilities shall be provided in the machine room of a large hoist. A movable machine cover shall be provided for a hoist arranged outdoors. For a fixed wire rope hoist located in a severely cold region and required to operate in winter, the machine room shall be provided with heat insulation facilities; for a hoist in a hot region, cooling facilities may be provided in the machine room.

4.0.4 The installation elevation of a hoist shall prevent the hoist and the electrical equipment from being submerged, and shall facilitate the normal maintenance of the gate, the gate slot and the components of the hoist.

4.0.5 The lift of a hoist shall satisfy the requirements of the operation and maintenance of the gate, and a margin shall be left.

4.0.6 The arrangement of a hoist shall prevent the wire ropes, the running blocks, the lifting appliances and the tie rods from interfering with the gate, the gate slot and the hydraulic structures.

4.0.7 When a hoist lifts a plane gate, the hoisting centre line of the hoist shall coincide with the hoisting centre line of the gate.