GB/T 51132-2015 PDF English
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Code for construction and quality acceptance of industrial non-ferrous metallic piping engineering
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GB/T 51132-2015: Code for construction and quality acceptance of industrial non-ferrous metallic piping engineering
---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/GBT51132-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB/T 51132-2015
Code for construction and quality acceptance of industrial
non-ferrous metallic piping engineering
Issued on. SEPTEMBER 30, 2015
Implemented on. JUNE 01, 2016
Issued by. Ministry of Housing and Urban-Rural Development of PRC.
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Code for construction and quality acceptance of industrial
non-ferrous metallic piping engineering
Main drafting organization. China Nonferrous Metals Industry Association
Approved by. Ministry of Housing and Urban-Rural Development of PRC
Date of implementation. June 1, 2016
China Planning Press
2015 Beijing
Table of Contents
Foreword... 6
1 General provisions... 8
2 Terms... 8
3 Basic requirements... 9
4 Inspection and storage of piping components... 10
5 Pipe processing... 18
6 Pipe welding... 25
7 Pipe network installation... 36
8 Pressure test of pipe network... 48
9 Blowing and cleaning of pipe network... 53
10 Inspection and acceptance of project quality... 58
Appendix A Inspection records for construction quality of industrial non-ferrous
metallic piping... 60
Appendix B Form and dimensions for welding groove of industrial non-ferrous metallic
piping... 71
Appendix C Batch quality inspection and acceptance record... 78
Appendix D Segments (sub-division) quality inspection and acceptance record... 79
Appendix E Segments (sub-division) quality control data inspection record... 80
Explanation of wording in this code... 81
List of quoted standards... 82
1 General provisions
1.0.1 In order to improve the construction level of industrial non-ferrous metal pipeline
projects, strengthen the quality control and acceptance of the construction process of
industrial non-ferrous metal pipeline projects, ensure the quality of the project, this
Code is hereby formulated.
1.0.2 This Code is applicable to the construction and quality acceptance of industrial
pipeline projects of copper, aluminum, lead, nickel, titanium, zirconium, tantalum,
niobium and their alloys.
1.0.3 This Code does not apply to the construction and quality acceptance of the
following industrial non-ferrous metal pipeline projects.
1 The manufacturer designs complete sets of pipes, that are integrated into the
equipment.
2 Special pipelines for military facilities and nuclear energy devices.
3 Pipes for offshore facilities and underground mines.
1.0.4 The construction and quality acceptance of industrial non-ferrous metal pipeline
projects shall not only comply with this Code, but also comply with the relevant
national standards.
2 Terms
2.0.1 Industry non-ferrous metal pipeline
Process pipes, other auxiliary pipes, pipes serving industrial production, which are are
connected or assembled by non-ferrous metal pipes and other piping components, to
transport process media in production device.
2.0.2 Intergranular corrosion
In some environments, when the dissolution rate of the grain boundaries is greater than
the dissolution rate of the grains themselves, corrosion occurs along the metal grain
boundaries or grain boundaries.
2.0.3 Solution treatment
A heat treatment process, in which the alloy is heated to a high temperature and
maintained at a constant temperature in the single-phase region, so that the excess phase
is fully dissolved into the solid solution and then rapidly cooled, to obtain a
supersaturated solid solution.
2.0.4 Roundness
The ratio -- of the difference between the maximum outer diameter and the minimum
outer diameter on the cross section of the elbow TO the average of the maximum outer
diameter and the minimum outer diameter.
3 Basic requirements
3.0.1 Pipeline projects shall have approved construction program, construction plan,
other technical documents, before construction.
3.0.2 Process handover inspection shall be conducted between pipeline engineering
construction and other related disciplines, meanwhile quality acceptance records shall
be formed.
3.0.3 During the pipeline project construction process, various construction technical
documents, construction records, inspection reports, quality acceptance records, and
other project acceptance work shall be completed.
3.0.4 The quality acceptance of industrial non-ferrous metal pipeline projects can be
divided into item work, segment work (sub-division work).
3.0.5 The non-ferrous metal pipeline project in the same unit project can be divided into
one segment work or several sub-division work.
3.0.6 Item work shall be divided, according to pipeline pressure levels and materials.
4 Inspection and storage of piping components
4.1 General requirements
4.1.1 Piping components shall have product quality certification documents from the
manufacturer; the technical parameters shall meet the requirements of the design
documents.
4.2 Pipes inspection
4.2.1 The outer diameter and wall thickness of the pipe shall be inspected before use.
The outer diameter inspection shall comply with the current national standards for non-
ferrous metals and alloy products; where there are no requirements for non-standard
pipe design, the allowable deviation of wall thickness shall comply with the provisions
of Table 4.2.1.
4.2.2 Where there is no requirement in the design, the straightness of the pipe shall
comply with the provisions of Table 4.2.2.
4.3 Valves inspection
4.3.1 Appearance quality inspection shall be carried out before the valve is installed,
which shall comply with the following requirements.
4.4 Inspection of other piping components
4.4.1 The surface of pipe fittings shall be smooth and clean, without defects such as
cracks, pinholes, folds, delamination, dents, scratches, blisters, etc.
4.4.6 Compensator inspection shall comply with the following requirements.
4.5 Storage and transportation of piping components
4.5.1 Piping components shall be stored separately and neatly, according to category,
material, specification. They shall be labeled. They shall not be stored in a mixed
manner. Steel stamps must not be used for marking pipes and pipe fittings. The
materials used for marking nickel and nickel alloy pipes must not contain halogens or
halides; meanwhile measures such as anti-corrosion, anti-deformation, anti-surface
damage shall be taken.
4.6 Quality inspection and acceptance
I Main control items
4.6.1 Piping components shall be checked against the quality certification documents
provided by the manufacturer. The performance parameters shall comply with the
provisions of relevant technical documents.
Inspection quantity. 100% inspection.
Inspection method. Check the certificate of conformity and quality inspection report;
check relevant technical documents.
5 Pipe processing
5.1 General requirements
5.1.1 Special processing tools shall be used for pipe processing. During processing,
measures shall be taken to prevent pipe damage, deformation, deterioration, and
reduction of material performance. Iron tools shall not be used in direct contact with
pipes.
5.2 Pipe straightening and rounding
5.2.1 Pipe straightening and rounding shall be carried out on a platform, which is paved
with soft pads. Straightening shall meet the following requirements.
5.2.2 After the pipe is straightened and rounded, the inside and outside of the pipe shall
be cleaned.
5.3 Pipe cutting and groove processing
5.3.1 Mechanical methods should be used for cutting copper, aluminum, lead, nickel,
titanium, zirconium and their alloy pipes. When thermal cutting is used, mechanical
methods shall be used to remove the heat-affected area of the cutting. Tantalum,
niobium and their alloy pipes should be cut by wire cutting or mechanical methods.
5.4 Bending fabrication
5.4.1 The bending radius of the elbow shall comply with the provisions of the design
documents. If there is no provision in the design documents, it should comply with the
provisions of Table 5.4.1.
5.4.4 Lead pipes with a nominal diameter less than or equal to 100 mm can be cold-
bent; lead pipes with a nominal diameter greater than 100 mm can be hot-bent. During
hot bending, sand must not be filled in the pipe.
5.6 Fabrication of piping support-bracket and hanger
5.6.1 The type, material, processing dimensions, accuracy of support-bracket and
hanger shall comply with the design documents and the current national standards for
pipeline accessories.
5.6.2 The assembly of support-bracket and hanger, welding and inspection of main
stress-bearing components shall comply with the design documents, as well as the
provisions of the current national standard "Code for construction of industrial metallic
piping engineering" GB 50235.Observation and inspection shall be carried out after
welding; welding deformation shall be corrected.
6 Pipe welding
6.1 General requirements
6.1.1 Welding procedure qualification shall be carried out before the construction of
pipeline welding projects. The qualification standards and methods shall comply with
the provisions of the current national standards on pressure equipment and pipeline
welding procedure qualification.
6.1.2 Before pipeline welding, a welding procedure specification shall be prepared,
based on the welding procedure qualification.
6.2 Preparation before welding
6.2.1 Before pipeline welding, the welding materials shall be inspected, which shall
meet the following requirements.
6.3 Welding process
6.3.1 Welding of copper and copper alloy pipelines shall comply with the following
requirements.
6.4 Heat treatment after welding
6.4.1 The post-weld heat treatment of pipelines shall comply with the provisions of the
heat treatment process documents.
6.5 Inspection after welding
6.5.1 After the pipeline welding operation, the appearance of the weld shall be inspected
for quality. There shall be no undercuts, dents, pinholes, slag inclusions, incomplete
welding and other defects on the surface of the weld. Non-destructive testing shall be
carried out after passing the visual inspection.
6.5.2 The surface of the welded pipe shall be free of arc scratches, welding slag, spatter.
7 Pipe network installation
7.1 General requirements
7.1.1 The installation process and tools for pipelines shall be selected, based on design
documents, material quality certification documents, material properties, etc.
7.2 Threaded connection
7.2.1 Threaded connections shall use protective agents, lubricants, etc. according to the
working conditions; they shall not affect the delivered medium or pipeline.
7.2.2 Before installing threaded pipes, check whether the threads are clean, smooth, intact.
7.3 Flanged connection
7.3.1 The types and parameters of flanges, flange gaskets, fasteners shall comply with
the design documents and the current national standards for pipeline accessories.
7.6 Quality inspection and acceptance
I Main control item
7.6.1 The material and performance of the isolation material, between non-ferrous metal
piping components and ferrous metal pipeline supports, shall comply with the
provisions of the design documents.
8 Pressure test of pipe network
8.1 General requirements
8.1.1 After all the installation work of the pipe network except the insulation
construction is completed and passed the inspection, a pressure test shall be carried out.
8.1.2 The pipe network shall undergo pressure testing in accordance with the provisions
of the design documents and shall comply with the following provisions.
8.2 Hydraulic pressure test
8.2.1 Before hydraulic testing of the pipe network, it shall inspect the appearance,
geometric dimensions, connection quality, safety facilities of the pipe network and
temporary pressurized pipelines.
8.2.2 Clean water shall be used for hydraulic testing of pipe networks. When nickel and
nickel alloy pipes or equipment are connected to nickel and nickel alloy pipes for testing,
the chloride ion content in the water shall not exceed 50 mg/L. When a flammable liquid
medium is used for testing, the flash point of the liquid medium shall not be lower than
50 °C; meanwhile safety protection measures shall be taken.
8.3 Air pressure test
8.3.1 The pipe network shall be subjected to air pressure tests according to design
requirements; the air pressure tests shall meet the following requirements.
8.4 Leakage test
8.4.1 Pipelines transporting extremely hazardous media, highly hazardous media,
flammable media shall be subject to leakage tests.
8.4.2 The leakage test shall be carried out after the pressure test is qualified. The test
medium should be air; the leakage test pressure shall be the design pressure.
8.4.3 The leakage test can be carried out simultaneously with the commissioning work.
8.4.4 The leakage test shall slowly increase the pressure, at 10% of the test pressure
level by level. When the test pressure is reached, the pressure shall be stabilized for 30
minutes. There shall be no leakage in the stuffing box, flange, connection points,
interfaces of the valve.
9 Blowing and cleaning of pipe network
9.1 General requirements
9.1.1 Before the pipe network that has passed the pressure test is put into use, the pipe
network shall be purged and cleaned. A pipe network purging and cleaning plan shall
be prepared, which shall be implemented after approval. Safety measures shall be taken
during purging and cleaning.
9.2 Water flushing of pipe network
9.2.1 Clean water shall be used for flushing the pipe network. When flushing nickel and
nickel alloy pipelines, the chloride ion content in the water must not exceed 50 mg/L.
9.2.2 The average flow rate of water flushing in the pipe network shall not be less than
1.2 m/s; the flushing pressure should be 0.2 MPa ~ 0.3 MPa, which shall not exceed the
design pressure.
9.3 Air blowing of pipe network
9.3.1 The purging pressure of the pipe network shall not be greater than the design
pressure of the system equipment and pipelines. The average purging flow rate of
copper, aluminum, nickel, titanium, zirconium, tantalum, niobium and their alloy pipes
shall not be less than 20 m/s. The average purging flow rate of the lead and lead alloy
pipe shall not be less than 15 m/s and shall not be less than the design flow rate.
9.3.2 Oil-free pipe networks shall be purged with oil-free compressed air or other oil-
free gases.
9.4 Degreasing of pipe network
9.4.1 The oil-free pipe network shall be decreased, in accordance with the provisions
of the design documents.
9.4.2 The prepared degreasing liquid shall be tested and verified. The degreasing agent
or degreasing liquid shall have no harm to the workpiece, human body, environment.
9.5 Chemical cleaning of pipe network
9.5.1 The formula and technical parameters of the chemical cleaning solution shall be
determined through testing.
9.5.2 Online circulation chemical cleaning operations shall be carried out after the pipe
network pressure test has passed. Equipment and pipelines that do not require chemical
cleaning shall be isolated. The cleaning fluid shall flow in from the low end of the pipe
network and flow out from the high end.
9.5.6 For pipe networks that have passed chemical cleaning, protective measures shall
be taken to prevent re-contamination.
9.5.7 Chemical cleaning of the pipe network shall comply with the provisions of the
design documents.
9.6 Quality inspection and acceptance
I Main control items
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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