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  • BSI
    BS 6990:1989 Code of practice for welding on steel pipes containing process fluids or their residuals
    Edition: 1989
    $435.35
    / user per year

Description of BS 6990:1989 1989

This code covers operations relating to and involving arc welding on ferritic steel and austenitic stainless steel land or offshore pipelines and process plant pipework which contain or have contained a process fluid and which are at least 5 mm thick. It gives details of procedures prior to, during and after all these operations.

NOTE 1 Welding on pipes of thickness below 5 mm is not covered by this code although it can be undertaken.

The code covers manual, semi-automatic and mechanized arc welding by the following processes or combination of processes:

  1. manual metal-arc welding;

  2. MIG/MAG welding;

  3. TIG welding;

  4. flux cored arc welding;

  5. non-shielded welding.

It is essential that the items listed in clause 3 should be fully documented and followed.

Welding operations needing post-weld heat treatment for adequate weld quality are not within the scope of this code.

This code is not applicable to a pipeline or pipework that has been fully isolated and decontaminated or has not been commissioned. These are covered by other standards such as BS 2633, BS 4677 and BS 4515.

This code does not relate to a pipeline or pipework containing a process fluid or its residuals that will become explosively unstable upon the application of heat or will affect the pipe material by rendering it susceptible to ignition, stress corrosion cracking or embrittlement.

NOTE 2 The titles of the publications referred to in this code are listed on the inside back cover.



Covers details prior to, during and after all operations relating to and involving the safe arc welding on ferritic and austenitic steel land or offshore pipelines and process plant pipework which contain or have contained a process fluid and which are at least 5 mm thick.

Standard NumberBS 6990:1989
TitleCode of practice for welding on steel pipes containing process fluids or their residuals
StatusConfirmed
Publication Date1989-02-28
ReplacesDD 39:1974
DescriptorsPipework systems, Welders, Arc welding, Pipes, Safety measures, Pipe fittings, Pipelines, Approval testing, Non-destructive testing, Occupational safety, Inspection, In situ, Pressure pipes, Welding, Acceptance (approval), Repair, Thickness, Steels, Austenitic steels, Ferritic steels, Gas-shielded welding, Stainless steels
ICS25.160.10 Welding processes
CommitteeWEE/36
ISBN0 580 16672 4
PublisherBSI
Pages28

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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