GB/T 16507.4-2013Water-tube boilers -- Part 4: Strength calculation of pressure parts (English PDF)

Foreword

GB/T 16507 "Water-tube Boilers" includes the following eight parts.

- Part 1.General;

- Part 2.Materials;

- Part 3.Structural Design;

- Part 4.Strength Calculation of Pressure Parts;

- Part 5.Manufacture;

- Part 6.Inspection, Test and Acceptance;

- Part 7.Safety Appurtenances and Instruments;

- Part 8.Installation and Operation.

This part is Part 4 of GB/T 16507.

This part was drafted according to the rules specified in GB/T 1.1-2009.

This part partially replaces GB/T 16507-1996 and GB/T 9222-2008.The main

technical differences are as follows.

- This part was formulated based on GB/T 9222-2008.The requirements regarding

the materials and permissible stress table in GB/T 9222-2008 were incorporated

into Part 2 of this standard (GB/T 16507.2); the structural requirements on

process were incorporated into Part 3 (GB/T 16507.3). This part contains the

other contents in GB/T 9222-2008 and has integrated the relevant contents in

GB/T 16507-1996.The chapters were divided according to the calculation

process, including 16 chapters and 4 appendixes.

- Partial symbols, angle code and the like in the primary standard were modified;

- The permissible stress correction coefficient table was modified and only the

correction coefficients of the material permissible stress related to the component

operating condition were preserved. Others permissible stress correction

coefficients regarding the structures were abolished. Equivalent correction was

considered in calculation of component thickness. The structural coefficients of

corresponding components were modified and permissible stress correction

coefficient 0.95 for boiler drum and head of a rated pressure larger than or equal

to 16.7MPa was cancelled;

- The determination method of calculation pressure was modified and the

requirements that the calculation pressure shall be larger than or equal to the

sum of the operating pressure and the additional pressure designed for safety

valve setting were explicitly defined; the mandatory provision concerning the

designed additional pressure for safety valve setting was cancelled, and the

additional pressure value is optional by reference to informative Appendix B;

- The weld efficiency table was modified and the weld efficiency was determined

according to the weld groove form and non-destructive testing scope;

- The determination method of additional process thickness was modified and the

relevant mandatory provisions were cancelled. Appendix C (informative) can be

referred for adoption of additional process thickness;

- The thickness calculation formulae for outer arc, middle arc and inner arc of bent

tube or bend were provided, and specified that the required thickness of inner arc

of the bent tube or elbow with an outer diameter exceeding 100mm shall be

checked;

- The thickness calculation specifications for the small-bore tube which is subject to

external pressure were modified; and the provision about referring to the standard

calculation stated in GB 150 was added;

- Partial structural forms of flat lid were adjusted and newly-added;

- Provisions related to the verification of stress analysis were added and the

concerning general procedures were specified.

This part was proposed by and shall be under the jurisdiction of National Technical

Committee on Boilers and Pressure Vessels of Standardization Administration of

China (SAC/TC 262).

Chief drafting organization of this part. Shanghai Power Equipment Research

Institute.

Participating drafting organizations of this part. Harbin Boiler Co. Ltd., Dongfang

Boiler Group Co., Ltd., Shanghai Boiler Works Co., Ltd., Wuhan Boiler Co., Ltd., Wuxi

Huaguang Boiler Co., Ltd., Babcock & Wilcox Beijing Company Ltd., Hangzhou Boiler

Group Co., Ltd., Power Equipment National Engineering Research Center, Sichuan

Chuanguo Boiler Co., Ltd., and Jinan Boiler Group Co., Ltd.

Chief drafting staffs of this part. Li Liren, Liang Jianping, Xiao Zhonghua, Dong

Shihong, Xiao Huifang, Yao Meichu, Luo Sheng, Zheng Shuiyun, Zhao Weimin, Li Lin,

Zhang Qiangjun, Wu Xiangpeng, Sheng Jianguo, Chen Wei, and Mao Hefang.

The previous editions replaced by this part are as follows.

- GB/T 9222-2008;

- GB/T 16507-1996.

Water-Tube Boilers - Part 4.Strength

Calculation of Pressure Parts

1 Scope

This part of GB/T 16507 specifies the strength calculation of pressure parts used in

water-tube boilers and the designed permissible stress of materials, and determines

the method for verifying the maximum permissible working pressure of parts.

This part is applicable to the pressure parts of water-tube boilers defined in GB/T

16507.1, including boiler drum, header drum, tube, pipeline within the range of boiler,

convex head, flat lid and cover plate, tee joint and other non-rectangular components.

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 Pressure Vessels

GB/T 16507.1 Water-tube Boilers - Part 1.General Provisions

GB/T 16507.2 Water-tube Boilers - Part 2.Materials

GS/T 16507.5 Manufacture

DL/T 5366 Technical Code for Calculating Steam/Water Piping Stress in

Fossil Power Plants Code for Designing

JB/T 6734 Strength Calculation Method for Boiler Fillet Weld

3 Terms and Definitions

For the purposes of this document, the terms and definitions defined in GB/T 16507.1

and the following ones apply.