BS 6990:1989
Current
The latest, up-to-date edition.
Code of practice for welding on steel pipes containing process fluids or their residuals
Hardcopy , PDF
English
02-28-1989
Foreword
Committees responsible
Code of practice
Section one. General
1 Scope
2 Definitions
3 Information, items to be approved and items to be
agreed and to be documented
Section two. Safety considerations
4 Legal requirements
5 Preliminary considerations
6 Factors affecting safety
Section three. Welding
7 Pipe thickness, temperature and internal pressure
8 Pipe material
9 Fitting material
10 Welding equipment
11 Electrodes and filler metals
12 Shielding gases
13 Approval and testing of welding procedures
14 Approval and testing of welders
15 Preparation of pipe
16 Inspection of fittings
17 Fusion faces
18 Preparation for encirclement fitting
19 Preparation for set-on fitting
20 Alignment of flanged fittings
21 Working clearance
22 Stray arcs
23 Weather conditions
24 Preheating
25 Sequence of welding
26 Inter-run cleaning
27 Inspection
28 Non-destructive testing acceptance criteria
29 Rectification of welds
Tables
1 Welding procedure details
2 Changes affecting procedure approval (essential
variables)
Figures
1 Typical fittings
2 Typical longitudinal weld preparation for fitting:
dimensions and tolerances
3 Attachment of run-on/run-off plates to backing
material
4 Typical yoke-type clamp for encirclement tee
fittings
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