bill bruce 30 june 2010 appendix b revisions for twenty-first edition of api 1104 proposed letter...
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Bill Bruce 30 June 2010
Appendix B Revisions for Twenty-First Edition of API 1104
Proposed Letter Ballots
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Appendix B Revisions for 21st Edition of API 1104
30 June 2010
2
Proposed Revisions to Appendix B
Eight letter ballot items pertaining to revisions to Appendix B for Twenty-First Edition of API 1104 are proposed- Seven pertain to various technical issues discussed at New Orleans meeting in January - Eighth letter ballot pertains to incorporating weld deposition repair into Appendix B
- Includes MS Word document of Appendix B revised using “Track Changes” and “Insert Comment” features
Proposed ballot items were developed by a working group established at New Orleans meeting
Have since been distributed to Maintenance Welding sub-committee members
No comments were received- Ready for discussion
© Det Norske Veritas AS. All rights reserved.
Appendix B Revisions for 21st Edition of API 1104
30 June 2010
3
Proposed Revisions Pertaining to Various Technical Issues
Proposed revisions include:- Clarify the definition of in-service weld as being welds that include fusion into the carrier pipe- Heat input ranges for each layer to be specified for procedures using temper bead- Procedures that rely on tempering and weld deposition sequence should include tolerance
for bead spacing to assure tempering- Carbon equivalent for pipe and attachments is an essential variable
- For in-service fillet welds, SMYS is not an essential variable- For non-fillet welds, the completed weld should meet or exceed the SMYS of the pipe.
- A change in the bead spacing beyond the limits specified in the WPS constitutes an essential variable
- Determine the maximum hardness of the coarse grained HAZ of the pipe and attachment- For temper bead procedures, include requirement for welder to demonstrate the ability to
make welds within the specified heat input range
© Det Norske Veritas AS. All rights reserved.
Appendix B Revisions for 21st Edition of API 1104
30 June 2010
4
Proposed Revisions to Incorporate Weld Deposition Repair
Weld deposition repair is a useful pipeline repair technique for applications where repair by welded full-encirclement sleeves and fiber reinforced composites is difficult or impossible, such as corrosion-caused loss of wall thickness in bend section, elbows, and tees
The use of this technique is addressed in ASME B31.4, ASME B31.8, CSA Z662, and ASME PCC-2
Proposed revisions include:- Procedure and welder qualification
- Essential variables- What test welds need to be made- How many test specimens need to be extracted- What tests the specimens should be subjected to
- Suggested in-service welding practices for weld deposition repair
Letter ballot consists of MS Word document using “Track Changes” and “Insert Comment” features
© Det Norske Veritas AS. All rights reserved.
Appendix B Revisions for 21st Edition of API 1104
30 June 2010
5
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