GB/T 20801.5-2025 (GB/T 20801.5-2020) PDF English
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GB/T 20801.5: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 20801.5-2025 | 1899 | Add to Cart | 10 days | Pressure piping code - Part 5: Hydrogen piping and pipelines | Valid |
| GB/T 20801.5-2020 | 245 | Add to Cart | Auto, 9 seconds. | Pressure piping code - Industrial piping - Part 5: Inspection and testing | Valid |
| GB/T 20801.5-2006 | 85 | Add to Cart | Auto, 9 seconds. | Pressure piping code -- Industrial piping -- Part 5: Inspection and testing | Obsolete |
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GB/T 20801.5-2020: Pressure piping code - Industrial piping - Part 5: Inspection and testing
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20801.5-2020GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.040 J 74 Replacing GB/T 20801.5-2006 Pressure piping code - Industrial piping - Part 5. Inspection and testing Issued on. NOVEMBER 19, 2020 Implemented on. JUNE 01, 2021 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Examination requirements... 7 5 Examination methods... 8 6 Examination scope and acceptance criteria... 10 7 Examination process... 19 8 Examination certificate and records... 19 9 Testing... 19 10 Record... 291 Scope
This Part of GB/T 20801 specifies the basic safety requirements for pressure piping inspection, examination and testing. This Part applies to the inspection, examination and testing of pressure piping which is defined by the scope of GB/T 20801.1.2 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/T 20801.1-2020, Pressure piping code - Industrial piping - Part 1. General GB/T 20801.2-2020, Pressure piping code - Industrial piping - Part 2. Materials GB/T 20801.3-2020, Pressure piping code - Industrial piping - Part 3.Design and calculation GB/T 20801.4-2020, Pressure piping code - Industrial piping - Part 4. Fabrication and assembly GB/T 20801.6-2020, Pressure piping code - Industrial piping - Part 6. Safeguarding3 Terms and definitions
Terms and definitions determined by GB/T 20801.1-2020, GB/T 20801.2-2020, GB/T 20801.3-2020, GB/T 20801.4-2020, GB/T 20801.6-2020, and the following ones are applicable to this document. 3.1 Inspection The compliance review process, which is carried out by the owner or an inspection agency independent of the piping builder, to verify whether the product or piping construction meets the specifications and engineering design requirements. 3.2 Inspector Full-time personnel of the owner or inspection agency engaged in inspection work.4 Examination requirements
4.1 General provisions 4.1.1 This Chapter stipulates the piping installation, including requirements for the examination of each component and its fabrication and processing technology, additional examinations and acceptance standards required by any engineering design. 4.1.2 The examination and testing of the piping components (or their elements) which are processed by the factory shall meet the requirements of relevant product standards and design documents. 4.4 Progressive examination When out-of-gauge defects are found in partial or sampling examination, they shall be dealt with according to the following requirements. 4.5 Examination personnel Field fabrication and welding examination and testing, if there is no special indication, shall be carried out by the construction unit. The examination personnel shall meet the definition in 3.4.5 Examination methods
5.1 General provisions 5.1.1 This Chapter specifies the main examination methods that confirm to this Part, the engineering design or the inspector’s requirements. If methods other than those specified in this Chapter are used, the acceptance criteria shall be specified in the engineering design. 5.3 Non-destructive testing The non-destructive testing of welded joints is divided into radiographic testing, ultrasonic testing, magnetic particle testing, penetrant testing, ultrasonic time of flight diffraction technique, and standard practice for X-ray digital radiography. 5.4 Hardness examination Welded joints, hot bending and hot formed components shall be subjected to the hardness examination, to check the reliability of the heat treatment process.6 Examination scope and acceptance criteria
6.1 Examination grade 6.1.1 Pressure piping is divided into five examination grades I, II, III, IV, V according to piping grade, material category and nominal pressure. 6.1.2 The examination grade of the pressure piping that meets one of the following conditions is grade I. 6.1.3 The examination grade of the pressure piping that meets one of the following conditions is grade II. 6.1.5 The examination grade of the pressure piping that meets one of the following conditions is grade IV. 6.1.6 The examination grade of grade GC3 pressure piping is grade V. 6.2 Visual examination 6.5 Hardness examination 6.5.1 Unless otherwise specified in the design documents, the quantity and acceptance criteria of the pressure piping hardness examination shall meet the requirements of 9.6 in GB/T 20801.4-2020.7 Examination process
The examination shall be carried out according to a certain method specified in Chapter 5; the inspector shall verify the evaluation result, date and record of the examination process.8 Examination certificate and records
The examination personnel shall make sure that the materials and components are of the specified grade and have passed the required heat treatment, examination and testing, through the review of the certificate, quality certificate, marking and other certification documents.9 Testing
9.1 Pressure testing 9.1.1 General requirements Before the initial operation and after the completion of the relevant examinations in accordance with the requirements of Chapter 6, each piping system shall be subjected to pressure test to ensure its pressure-bearing strength and tightness. Except for the case where the pressure test can be replaced, which is specified in 9.1.1.1, the hydraulic test shall be carried out in accordance with the provisions of 9.1.3. 9.1.1.5 Vacuum or external pressure piping The pressure test of vacuum or external pressure piping shall meet the following requirements. 9.1.1.6 Jacketed pipe The pressure test of the jacketed pipe shall meet the following requirements. 9.1.1.8 Test record A test record shall be made for each piping system; the record content shall at least include the following main contents. 9.1.2 Preparation 9.1.2.1 Exposed joints The exposed joints during the pressure test shall meet the following requirements. 9.1.3 Hydraulic test The hydraulic test shall meet the following requirements. 9.3 Vacuum test Except for the case of 9.1.1.5b), after the vacuum piping system is qualified in the pressure test, a 24 h vacuum test shall be carried out in accordance with the provisions of the design documents, and the pressure increase rate shall not exceed 5%. The pressurization rate shall be calculated according to ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
