GB 50517-2010(2023)Code for construction quality acceptance of metallic piping in petrochemical engineering (2023 revision) (English PDF)

Explanation of the partial revision

This partial revision of the code was carried out on national standard GB 50517-2010 Code for construction quality acceptance of metallic piping in petrochemical engineering by SINOPEC Tenth Construction Co., Ltd. together with SINOPEC Engineering Incorporation, SINOPEC Fourth Construction Co., Ltd., SINOPEC Fifth Construction Co., Ltd., the General Station of Petrochemical Engineering Quality Supervision, Wison Engineering (China) Co., Ltd. and other organizations, in accordance with the requirements of the Notice on Issuing the 2019 Plan for the Development of Engineering Construction Codes and Standards and Related Work (Jianbiaohan [2019] No. 8) of the Ministry of Housing and Urban-Rural Development.

The main contents of the partial revision include:

1. Some referenced standards have been updated;

2. The petrochemical piping classification table has been modified;

3. The classification criteria for acute toxicity categories of toxic media and the acute toxicity classification criteria for toxic mixture media have been clarified;

4. The scope of the inspection grades for austenitic stainless steel has been delimited and explanations have been added;

5. The requirements for valve acceptance and valve pressure tests have been revised;

6. The inspection proportions and sampling quantities for re-inspection in the acceptance of materials have been adjusted;

7. The requirements for welding ambient temperature and weldment temperature have been revised;

8. Requirements for bevel preparation and fit-up of piping components of aluminium, nickel, titanium, zirconium, etc. and their alloys have been added;

9. Requirements for fit-up, welding and heat treatment of branch connection joints of different forms have been added;

10. Requirements for welding and installation of jacketed pipes have been added;

11. The heat treatment temperature requirements for welded joints of commonly used materials and the preheating requirements before welding have been adjusted;

12. Technical requirements for phased array ultrasonic testing and time-of-flight diffraction ultrasonic testing have been added;

13. It has been clarified that the proportion of non-destructive testing of welded joints shall be counted by inspection lot;

14. The sampling proportion and sampling method of non-destructive testing and the progressive examination method have been revised;

15. The leak test requirements have been revised;

16. Annex A and Annex B have been deleted.

The underlined parts of the provisions of this code are the modified contents; the provisions printed in bold type are mandatory provisions and shall be strictly implemented.

Chief development organization of this partial revision: SINOPEC Tenth Construction Co., Ltd.

Participating development organizations: SINOPEC Engineering Incorporation; SINOPEC Fourth Construction Co., Ltd.; SINOPEC Fifth Construction Co., Ltd.; General Station of Petrochemical Engineering Quality Supervision; Wison Engineering (China) Co., Ltd.

Foreword

This code was jointly developed by SINOPEC Tenth Construction Company together with SINOPEC Fourth Construction Company, SINOPEC Fifth Construction Company, Wison Engineering (China) Co., Ltd. and other organizations, in accordance with the requirements of the Notice on Issuing the Plan for the Formulation and Revision of Engineering Construction Standards and Codes in 2006 (Second Batch) (Jianbiao [2006] No. 136) of the former Ministry of Construction.

During the development of this code, the drafting group carried out special studies and fairly extensive investigation, summarized the practical experience of petrochemical engineering construction in recent years, adhered to the guiding principle of 'separating verification from evaluation, strengthening acceptance, improving means and controlling the process', solicited comments from design, construction, supervision and other parties in various forms, discussed the main issues several times, and finally finalized the code after review.

This code comprises 12 chapters and 2 annexes. The main contents include: general provisions, terms, basic requirements, piping classification, acceptance of piping materials, piping prefabrication, piping welding, piping installation, inspection and examination of piping welds, piping tests, piping blowing and flushing, and technical documents for handover.

The provisions printed in bold type in this code are mandatory provisions and shall be strictly implemented.

The Ministry of Housing and Urban-Rural Development is responsible for the administration of this code and the interpretation of the mandatory provisions, China Petrochemical Corporation is responsible for the routine management, and SINOPEC Tenth Construction Company is responsible for the interpretation of the specific technical contents. During the implementation of this code, all organizations are requested to sum up experience and accumulate data in combination with engineering practice, and to send comments or suggestions at any time to SINOPEC Tenth Construction Company (address: No. 29 Jianshe Road, Linzi District, Zibo City, Shandong Province; postcode: 255438) for reference in future revision.

Chief development organization: SINOPEC Tenth Construction Company

Participating development organizations: SINOPEC Fourth Construction Company; SINOPEC Fifth Construction Company; Wison Engineering (China) Co., Ltd.

1 General provisions

1.0.1 This code is formulated with a view to strengthening the quality management of petrochemical construction projects, standardizing the construction quality acceptance of metallic piping works in petrochemical engineering and ensuring the construction quality of piping.

1.0.2 This code is applicable to the construction quality acceptance of metallic piping works in petrochemical engineering with a design pressure not greater than 42 MPa and a design temperature not lower than -196 °C.

1.0.3 This clause is deleted.

1.0.4 In addition to this code, the construction quality acceptance of metallic piping works in petrochemical engineering shall also comply with the provisions of the relevant current national standards.

2 Terms

3 Basic requirements

3.0.1 This clause is deleted.

3.0.2 Welders and non-destructive testing personnel engaged in the construction of petrochemical metallic piping shall have working skills appropriate to the work they perform.

3.0.3 The construction of petrochemical metallic piping shall be carried out in accordance with the design documents. Modification of the design or substitution of materials shall be approved by the original design organization.

3.0.4 The construction quality of paint anti-corrosion of metallic piping shall comply with the current industry standard SH/T 3548 Code for construction quality acceptance of anticorrosion coating engineering in petrochemical industry.

3.0.5 The construction quality of insulation of metallic piping shall comply with the current national standard GB 50645 Code for construction quality acceptance of insulation engineering in petrochemical industry.

4 Piping classification

4.0.1 The classification of petrochemical metallic piping shall comply with Table 4.0.1.

Note to Table 4.0.1 Classification of petrochemical piping: Meaning of the codes of the piping classes: SH stands for the petrochemical industry, A for toxic media, B for flammable media, C for non-toxic, non-flammable media; the digit is the piping quality inspection grade.

4.0.2 In addition to complying with 4.0.1 of this code, the classification of petrochemical piping shall also comply with the following provisions:

1 The class of piping conveying oxygen shall be determined according to the design conditions as for Class B flammable gas in Table 4.0.1 of this code;

2 The classification of acute toxicity categories of toxic media shall comply with the National Catalogue of Hazardous Chemicals, and the classification of hazard degree levels of toxic media shall comply with the current national occupational health standard Classification of occupational hazards from exposure to toxic substances;

3 The acute toxicity of toxic mixture media shall be evaluated according to the classification criteria for mixtures specified in the current national standard GB 30000.18 Rules for classification and labelling of chemicals - Part 18: Acute toxicity, and the hazard degree level of toxic mixture media shall be determined taking into account factors such as the toxicant concentration from leakage and dispersion of the medium, exposure route, exposure time and engineering experience;

4 The fire hazard classification of flammable media shall comply with the current national standard GB 50160 Standard for fire prevention design of petrochemical enterprises;

5 For piping conveying media that are both toxic and flammable, the piping class shall be determined separately according to the SHA and SHB provisions of Table 4.0.1 of this code, and the higher of the two classes shall apply; where the piping classes are the same, the SHA piping class should apply.

4.0.3 The inspection grades of the piping listed in Table 4.0.1 of this code shall also comply with the following provisions:

1 The inspection grade of titanium and titanium alloy, zirconium and zirconium alloy, nickel and nickel-base alloy, and high chromium-nickel-molybdenum austenitic stainless steel piping, as well as of piping specified in the design as being in severe cyclic service or high-temperature creep service, shall not be lower than grade 1;

2 The inspection grade of chromium-molybdenum alloy steel, duplex stainless steel, and aluminium and aluminium alloy piping shall not be lower than grade 2;

3 The inspection grade of austenitic stainless steel (except non-toxic, non-flammable non-pressure piping) and of carbon steel piping for which the design requires impact testing shall not be lower than grade 3.

4.0.4 The construction and acceptance of oxygen piping shall also comply with the relevant provisions of the current national standard GB 16912 Safety technical regulation for oxygen and relative gases produced with cryogenic method.