Proposed Revision to API Standard 1104, 21st Edition
Rev. 0
Date:
Section:
Heading:
Subsection:
April 1, 2010
Appendix B – In-Service Welding
B.2 Qualification of In-Service Welding Procedures
B.2.1 Procedure Specification, B.2.1.1 Specification Information
CURRENT TEXT
PROPOSED TEXT
JUSTIFICATION
B.2.1.1.4 Weld Deposition Sequence
B.2.1.1.4 Weld Deposition Sequence
For procedures intended to overcome
the effect of the flowing contents by
using temper bead deposition sequence
(temper bead procedures), the required
weld deposition sequence should be
specified.
For procedures intended to overcome
the effect of heat removal by the
contents that rely on tempering and a
specific deposition sequence, the
required weld deposition sequence
should be specified. The weld deposition
sequence should include tolerances for
bead spacing to assure proper tempering
of the previous passes.
The additional text is necessary to
clarify the intent of this section and to
indicate that, for procedures intended to
overcome the effect of heat removal by
the contents using a temper bead
deposition sequence, control of bead
spacing is an important aspect of
assuring adequate tempering.
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