GB 50683-2011 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 50683-2011 | English | 145 |
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Code for Acceptance of Field Equipment, Industrial Pipe Welding Construction Quality
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GB 50683-2011: Code for Acceptance of Field Equipment, Industrial Pipe Welding Construction Quality
---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/GB50683-2011
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50683-2011
Code for Acceptance of Field Equipment,
Industrial Pipe Welding Construction Quality
Issued on. FEBRUARY 18, 2011
Implemented on. MAY 1, 2012
Jointly issued by. Ministry of Housing and Urban-Rural Development of
the People's Republic of China;
General Administration of Quality Supervision,
Inspection and Quarantine of the People's Republic of
China.
National Standard of the People's Republic of China
Code for Acceptance of Field Equipment,
Industrial Pipe Welding Construction Quality
Chief Development Department.
China Association of Engineering Construction Standardization - Chemical
Engineering Subcommittee
Approval Department.
Ministry of Housing and Urban-Rural Development of the People's
Republic of China
Implementation Date.
May 1, 2012
2012 Beijing
Announcement of the Ministry of Housing and Urban-
Rural Development of the People's Republic of China
No.939
Announcement on Publishing the National Standard of “Code for
Acceptance of Field Equipment, Industrial Pipe Welding
Construction Quality”
“Code for Acceptance of Field Equipment, Industrial Pipe Welding
Construction Quality” is hereby approved as national standard with the serial
number as GB 50683-2011 and shall be implemented on May 1, 2012.Therein,
Article (Item) 3.2.3 (4) is mandatory and must be enforced strictly.
Authorized by the Standard Rating Research Institute of the Ministry of
Housing and Urban-Rural Development of the People’s Republic of China, this
code is published and distributed by China Planning Press.
Ministry of Housing and Urban-Rural Development of the People's
Republic of China
February 18, 2011
Table of Contents
Foreword... 4
1 General Provisions... 7
2 Terms... 8
3 Basic Requirements... 9
3.1 Division for Acceptance of Construction Quality... 9
3.2 Acceptance of Construction Quality... 9
3.3 Procedure and Organization for Acceptance of Construction Quality... 10
4 Materials... 11
5 Preparation Before Welding... 13
6 Welding... 19
7 Heat Treatment After Welding... 21
8 Examination of Welded Seam Quality... 24
8.1 Visual Quality Examination of Welded Seam... 24
8.2 Nondestructive Detection of Welded Seam Surface... 28
8.3 Radiographic Examination and Ultrasonic Flaw Detection for Welded Seam... 29
8.4 Other Examination... 30
Appendix A -- Record for Quality Acceptance of Sub-item Project... 32
Explanation of Wording in This Code... 34
List of Quoted Standards... 35
1 General Provisions
1.0.1 This code was formulated in order to unify the acceptance of welding
quality acceptance of field equipment and industrial pipelines and strengthen
the engineering quality management.
1.0.2 This code is applicable to the construction quality acceptance of the
welding engineering of the metallic materials such as carbon steel, alloy steel,
aluminium and aluminium alloy, copper and copper alloy, nickel and nickel alloy,
titanium and titanium alloy as well as zirconium and zirconium alloy.
1.0.3 The codes shall be applied together with “Code for Construction of Field
Equipment, Industrial Pipe Welding Engineering” GB 50236.
1.0.4 The requirements for the construction quality acceptance of engineering
technical document and contract agreement document shall not be less than
those specified in this code.
1.0.5 Except meeting this code, the acceptance of welding engineering
construction quality shall also meet the requirements of the current relevant
national standards.
2 Terms
2.0.1 100 % examination
The entire examination of a specific item in a specified examination batch
2.0.2 Random sampling examination
The examination is conducted on a specific item by a certain proportion of
random sampling.
2.0.3 Local sampling examination
A specific part of examination is conducted for a specific item on every piece in
a specific examination batch.
3 Basic Requirements
3.1 Division for Acceptance of Construction Quality
3.2 Acceptance of Construction Quality
3.2.1 The quality acceptance of sub-item project shall meet the following
requirements.
3.2.3 Where the welding engineering does not meet the requirements of this
code, it shall be processed according to the following requirements.
3.2.4 The weld engineering without acceptance qualification shall not be put
into application
3.3 Procedure and Organization for Acceptance of Construction Quality
3.3.1 The sub-item project qualify acceptance shall be conducted based on the
self-examination qualification of construction organization and quality
acceptance records of sub-item project shall be filled by the project professional
quality inspector of the construction organization.
4 Materials Dominant items
4.0.1 Before the application of base metal, the examination and acceptance shall
be conducted according to the requirements of design document; the material,
specification and appearance quality shall meet the requirements of the product
standard and design document of base metal. The material marker shall be
clear and complete and shall be traced back to the product quality certification.
4.0.2 Before the application of the welding materials, the visual quality, quality
proof documents, external packing and packing mark shall be examined.
4.0.3 The welding material shall be baked according to the specification before
application and shall be kept dry in application process and the baking
conditions shall meet the requirements of welding materials directions and
relevant technical document.
5 Preparation Before Welding I Dominant items
5.0.1 Where nondestructive testing is required for the groove face in the design
document, magnetic particle testing or penetrant testing shall be conducted.
Groove face quality shall not be lower than Class I as specified in the current
professional standard “Nondestructive Testing of Pressure Equipment” JB/T 4730.
Examination quantity. it shall meet the requirements of the design
document.
5.0.3 Where the pipe butt weld is assembled, the in-wall misalignment shall
meet the requirements of Table 5.0.3.
5.0.5 Where the butt weld pieces with unequal thickness are assembled, the
end surface of thin piece shall be located within that of the thick piece. Where
the in-wall misalignment is greater than those specified in Articles 5.0.3 and
5.0.4 or the outer wall misalignment is greater than 3 mm, the groove dimension
after processing and finishing shall meet the requirements of Figure 5.0.5.
5.0.6 The position of weld seam of weldment shall meet the requirements of
the design documents and the following specifications.
5.0.7 The primary structure dimension and shape of weldment, the form and
dimension of groove and the quality of the groove surface shall meet the
following requirements.
5.0.8 Before welding, the cleaning quality of the groove surface and the inner
and outer surface on both sides of the groove shall meet the requirements of
Table 5.0.8.
6 Welding I Dominant items
6.0.1 As for weld seam with impact ductility requirement, the weld heat input
shall be measured in welding and shall be recorded. The weld heat input shall
meet the requirements of design document and welding process documents.
Examination quantity. all products.
6.0.2 As for the weld seam specified for intermediate nondestructive testing,
the nondestructive testing shall be conducted after the visual examination
qualification and the weld quality shall meet the relevant requirements of
Chapter 8 in this code.
6.0.3 As for the weld seam with specified requirements for the inter-pass
temperature, the inter-pass temperature shall meet the requirements of welding
process documents. As for the weldment with the requirements for preheating
before welding, the inter-pass temperature shall fall in the scope of the specified
preheating temperature.
6.0.4 As for the weld seam with the requirement of back chipping on the rear
surface, visual examination shall be conducted after back chipping and the weld
seam after back chipping shall expose metallic luster and the groove shape
shall be regular and tidy as well as meet the requirements of welding process.
6.0.6 After the tack weld, the slag shall be cleared for examination, and the
dimension and quality of tack weld shall meet the requirements of the current
national standard “Code for Construction of Field Equipment, Industrial Pipe
Welding Engineering” GB 50236 and the requirements of welding process
document.
7 Heat Treatment After Welding
I Dominant items
7.0.1 The post-weld heat treatment parameters of the field equipment and pipes
shall meet the requirements of design document, the current national standard
“Code for Construction of Field Equipment, Industrial Pipe Welding Engineering”
GB 50236, heat treatment process document and the following requirements.
7.0.2 The post-weld heat treatment effect examination of field equipment and
pipe shall meet the requirements of design document and the current national
standard “Code for Construction of Field Equipment, Industrial Pipe Welding
Engineering” GB 50236.Where product welding examination specimens are
required to be fabricated, they shall meet the requirements of Article 8.4.1 in
this code.
8 Examination of Welded Seam Quality
8.1 Visual Quality Examination of Welded Seam
I Dominant items
8.2 Nondestructive Detection of Welded Seam Surface
I Dominant items
8.2.1 Magnetic particle testing or penetrant testing shall be applied on weld
surface according to the requirements of the design document. The weld
surface nondestructive testing with reheating crack tendency shall be conducted
after heat treatment. As for the unqualified weld seam in magnetic particle testing
and penetrant testing, the specified testing method on the repair positions shall
applied for re-examination. Weld quality shall not be lower than Class I as
specified in the current professional standard “Nondestructive Testing of
Pressure Equipment” JB/T 4730.
8.4 Other Examination
I Dominant items
8.4.1 Where the product welding examination specimen is fabricated according
to the requirements of design documents and current relevant national standard,
the preparation, welding, sample preparation, mechanical property testing
method and approval standard shall meet the requirements of the design
document and the current professional standard “Mechanical Property Tests of
Product Welded Test Coupons for Pressure Equipment” NB/T 47016.
Examination quantity.
8.4.2 Where the chemical composition analysis of weld metal, the weld seam ferrite
content determination and metallographic examination of welded joint are
conducted according to requirements, the examination results shall meet the
requirements of design document.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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