API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

2-162 API RECOMMENDED PRACTICE 581
Table 24.1—Data Required for Determination of the DF—Mechanical Fatigue
Required Data
Corrective actions taken: modifications
based on complete engineering
analysis, modifications based on
experience, no modifications
Piping complexity: based on 15.24 m
(50 ft) of pipe, choose:
0 to 5 branches, fittings, etc.
5 to 10 branches, fittings, etc.
>10 branches, fittings, etc.
Type of joint or branch design used in
this piping: threaded, socket welded,
saddle on, saddle in, piping tee,
weldolet, sweepolet
Condition of the pipe: missing/
damaged supports, unsupported
weights on branches, broken gussets,
gussets/supports welded directly to
pipe, good condition
Comments
Credit is given for analysis work that shows that the shaking piping is not a
fatigue concern.
Determine the piping complexity in terms of the number of branched
connections, number of fittings, etc.
Determine the type of joint or branch connection that is predominant
throughout this section of piping that is being evaluated.
What is the condition of the piping section being evaluated in terms of
support?