GB/T 19624-2019Safety assessment of in-service pressure vessels containing defects (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 19624-2004 "Safety Assessment of Pressure Vessels in Use". Compared with GB/T 19624-2004, the main To change as follows.

--- Revised the canonical reference document (see Chapter 2, Chapter 2 of the 2004 edition);

--- Revised the primary stress distribution safety factor (see Table 1, Table 5-1 of the 2004 edition);

---Modified welding residual area, high restraint weld area or welding residual stress distribution caused by welding residual stress in unknown areas The value of the secondary stress (see 5.4.2.3.4, 5.4.2.4.4 of the 2004 edition);

--- Revised the safety assessment qualification conditions for pit defects and the conditions for exemption from evaluation (see 5.8, 5.8 of 2004 edition);

--- Revised the value of the flow stress (see 5.8.4 and H.7, 2004 editions 5.8.4 and H.7);

--- Increased inner ring circumferential crack of inner cylinder, semi-elliptical surface axial and circumferential crack, elliptical buried axial or circumferential crack The calculation formula of Lr modifies the calculation formula and applicable range of the long 2a penetration crack Lr on the inner pressure spherical shell, and adds a schematic diagram. (See Appendix C, Appendix C of the 2004 edition);

--- Increased inner ring circumferential crack of inner cylinder, semi-elliptical surface axial and circumferential crack, elliptical buried axial or circumferential crack The calculation formula of the 2a penetration crack KI on the inner and inner pressure spherical shells, and the calculation formula of the weld root crack KI in the cross joint is deleted. (See Appendix D, Appendix D of the 2004 edition);

--- Increased the impact of corrosion fatigue on safety assessment (see Appendix A);

--- Modified the method for determining the load ratio LFr during crack initiation (see G.4.2.2, G.4.2.2 of 2004);

--- Revised the formula for calculating the plastic limit internal pressure of a dimensionless defective pipe under pure internal pressure (see H.11.1, 2004 edition) H.11.1);

--- Increased safety assessment methods for pressure pipe elbows and three-way volume defects (see Appendix I);

--- Increased empirical formula for material fracture toughness substitution (see Appendix J).

Introduction

In order to adapt to the relevant national laws and regulations regarding the use of defective pressure vessels, pressure piping safety assessment requirements and engineering needs, I The country has successively launched the "Seventh Five-Year Plan" key scientific and technological projects "Research on the safety assessment of defective pressure vessels" and the "Eighth Five-Year Plan" national key research project "in service" Research on Safety Assessment and Explosion Prevention Technology of Boiler and Pressure Vessels and National Key Science and Technology Research Projects in the Ninth Five-Year Plan Evaluation and important pressure vessel life prediction technology research, based on these research work, formed in 2004 GB/T 19624-2004 "Safety Assessment of Pressure Vessels in Use". The standard is based on the principle of "combined use" and "weakest ring" and is used to identify defects in use.

Whether the pressure vessel can continue to be used safely under the specified conditions of use. The main drafting units and personnel of GB/T 19624-2004 are.

National Special Equipment Testing and Research Center Chen Gang, Li Xueren, Zuo Shangzhi, Sun Liang, Tao Xuerong, Jia Guodong; Zhong Qunpeng, Beijing University of Aeronautics and Astronautics Tian Yongjiang; Li Peining and Wang Zhiwen of East China University of Science and Technology; Yu Shouwen and Dong Yamin of Tsinghua University; Chen Xuedong and Zhang Liquan of Hefei General Machinery Research Institute, He Zhiren, Wang Bing; Shoubi Nan of China Petrochemical Economic and Technological Research Institute; Zhang Kangda of Zhejiang University of Technology; Qin Hong of Dalian University of Technology; Chinese General Stone Xiao Yougu, a mechanical engineering company; Wang Kuanfu, Zhejiang University; and Shen Shiming, Nanjing University of Technology.

In order to solve the problems in the implementation of the standard, the "10th Five-Year Plan" of national key scientific and technological research projects was launched.

Research on key technologies for safety protection of special pressure equipment in the industry", "National Five-Year" National Science and Technology Support Project "Large high-parameter high-risk complete sets Research on Key Technologies of Long-term Operation Safety Guarantee", Quality Inspection Public Welfare Project "Research on Pressure-bearing Equipment Based on Damage Mode And the application of research and other work, combined with the development of relevant international technology, completed the revision of GB/T 19624-2004. Safety assessment of pressure vessels containing defects

1 Scope

This standard specifies the terms, definitions and symbols for the safety assessment of pressure vessels containing defects, general theory, fracture and plastic failure assessment, fatigue Failure assessment.

This standard is applicable to the safety assessment of steel pressure vessels containing excessive defects. Boilers, pipes and other containers made of metal materials The pressure-receiving element can also be used for reference when performing safety assessment.

This standard applies to the safety assessment of pressure components with the following types of defects:

a) Plane defects: including cracks, unfused, incomplete penetration, undercuts with a depth greater than or equal to 1 mm;

b) Volume defects: including pits, pores, slag inclusions, undercuts with a depth of less than 1 mm.

This standard does not apply to the following pressure vessels and structures:

a) pressure vessels and structures subjected to nuclear radiation in nuclear energy installations;

b) non-independent pressure-bearing components on the machine (eg compressors, generators, pumps, pressurized casings or cylinders of diesel engines, etc.);

c) pressurized components subjected to direct fire;

d) Capacitive pressure vessels (closed appliances) for enclosed electrical equipment for the power industry;

e) Potential failure modes include creeping pressure vessels and structures.

2 Normative references

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

GB/T 150.2 Pressure Vessels Part 2: Materials

GB/T 228 (all parts) tensile test of metallic materials

GB/T 4161 Metallic material plane strain fracture toughness KIC test method

GB/T 6398 metal material fatigue test fatigue crack propagation method

GB/T 21143-2014 Unified test method for quasi-static fracture toughness of metallic materials

JB/T 4732 Steel Pressure Vessel Analysis Design Standard

NB/T 47013.2 Non-destructive testing of pressure equipment - Part 2: Radiographic testing

3 Terms, definitions and symbols