Foreword
Committees responsible
Specification
Section one. General
1. Scope
2. Information and requirements to be agreed and to
     be documented
3. Parent metal
4. Condition of pipes
5. Weld metal
6. Gases for shielding and purging
7. Equipment
8. Welding processes
9. Backing rings
10. Joint preparation
11. Proximity of welds
12. Fusion faces
13. Assembly for welding
14. Purging
15. Damage to parent metal by arc strikes
16. Inter-run cleaning
17. Cold pull
18. Pre-heating for cutting and welding
19. Change of pre-heating with welding process
20. Continuity of welding and pre-heating
21. Dressing of welds in 1/2 Cr 1/2 Mo 1/4 V pipes
22. Post-weld heat treatment
23. Temperature measurement
24. Transition joints between dissimilar steels
Section two. Butt joints
25. General
26. All types of butt joint
27. Gusseted bends
Section three. Branches and small bore connections
28. General
29. Branches
Section four. Socket-welding fittings
30. General
31. Socket joint details
Section five. Reinforcement of welded branch connections
              (compensation)
32. General
33. Preparation and assembly
34. Welding procedure
Section six. Structural attachments
35. General
36. Welding procedure
Section seven. Flanges
37. General
38. Welding neck flanges
39. Plate flanges
Section eight. Inspection
40. Requirements for visual examination of completed
     welds
41. Non-destructive testing
42. Defect limitations
Section nine. Rectification of defective welds
43. Removal of defects
44. Preparation for re-welding
45. Re-welding
Section ten. Welding procedure approval
46. General
47. Attachments to thin pipes
48. Impact test (when required)
Section eleven. Welder approval
49. General
50. Attachments to thin pipes
Appendices
A. Classes of operating conditions
B. Grades of steel in British Standards and similar
     grades for pipe in ASTM and DIN standards
C. Guidance on suitable types of weld metal
D. Typical joint preparations
E. Guidance on welding transition joints between
     ferritic steel and austenitic stainless steel
F. Guidance on the use of methods of non-destructive
     testing
Tables
1. Parent metals
2. Methods of making initial root runs in butt joints
3. Material for steel backing rings
4. Pre-heating for thermal cutting
5. Pre-heating for welding
6. Post-weld heat treatment
7. Typical limits for bore difference and alignment
     for manual welding
8. Penetration of root bead
9. Defect limits
10. Classes of operating conditions
11. Grades of steel in British Standards
12. Grades in ASTM and DIN standards of similar
     weldability to British Standard grades of pipe
13. British Standards for electrodes and filler wires
Figures
1. Permissible types of permanent backing ring
2. Types of backing ring not permissible
3. Permissible types of temporary steel backing ring
4. Example of proximity of attachment weld
5. Area (shaded) to be heated for the local treatment
     of branch connections
6. Post-weld heat treatment heating and cooling rates
     for materials other than 1/2 Cr 1/2 Mo 1/4 V and
     2 1/4 Cr 1 Mo steels
7. Segmental bends
8. Cut-and-shut bend
9. Socket joint details
10. Welding neck flange
11. Typical butt joint preparations for use with metal-
     arc welding, with backing ring for single or
     double root run
12. Typical butt joint preparations for use with metal-
     arc welding, with backing ring where protrusion
     into the bore is not permissible
13. Typical butt joint preparations for use with metal-
     arc welding without backing ring
14. Typical butt joint preparations for use with manual
     TIG welding, with or without filler wire
15. Typical butt joint preparations for use with TIG
     welding for the root run, with or without filler
     wire, or with fusible insert
16. Typical butt joint preparations using a narrow gap
17. Typical preparation and assembly of set-on right
     angle branches without backing
18. Typical preparation and assembly of set-on sloping
     branches without backing
19. Typical preparation and assembly of set-in branches
     (access from inside pipe)
20. Typical preparation and assembly of set-on right
     angles branches with temporary backing
21. Typical preparation and assembly of set-on sloping
     branches with temporary backing
22. Typical set-on connection
23. Typical small bore connections
24. Typical 'face and back' welded-on flange
25. Typical 'bore and back' welded-on flange
26. Typical 'bore and back' weldon-on flange for
     positional welding
27. Typical 'face and fillet' welded-on flange
28. Typical 'bore and fillet' welded-on flange
29. Typical 'bore and fillet' welded-on flange for
     positional welding
30. Typical 'slip on' welded-on flange
31. Typical 'slip on' hubbed welded-on flange
32. Typical 'face and fillet' hubbed welded-on flange