Page 162 - Machinery Component Maintenance
P. 162
Process Machinery Piping 145
0 Observe alignment of machinery with pipe being attached. If exces-
sive movement is noted, the pipe is to be disconnected and modified
until misalignment is brought within the limits permitted.
If the pipe is greater than 8 in. NPS, one may need to add sandbags or
similar weights to the pipe at the hanger adjacent to machinery to
simulate the operating condition of the pipe.
Pull stops on all system hangers.
Check to determine that no hanger travel indicator moves out of the
“Ih total travel” cold setting zone. If travel is excessive, refer imme-
diately to the design contractor for modifications of support.
Adjust the hanger to return travel marker to the “C” position.
Record alignment of machinery.
Reinstall piping system hanger stops.
Final Check, Immediately Prior to Machinery Operation
0 Break piping as necessary.
Flush and/or steam blow.
Repipe and realign.
Weight the hanger adjacent to the machinery.
Pull system pins, check “C” settings and fine tune hangers. If travel
is excessive (out of the 1/3 total “C” zone) contact the designated pip-
ing engineer for resolution.
Flange Jointing Practices
These steps can be written up in checklist format allowing field person-
nel to use piping-related guidelines in an efficient manner, as shown in
the appendices at the end of this chapter.
The importance of getting flanged joints right the first time cannot be
overemphasized if trouble-free performance during startup is desired. In
order to obtain an adequate joint the first time we must assure ourselves
that the contractor, subcontractor, and the working crews appreciate the
importance of quality workmanship needed during each stage of the
flange joint building process. This includes materials handling and stor-
age operations, piping prefabrication, erection, and bolting-up proce-
dures. Time spent in covering preventive measures. supervision and
crew guidance, and/or training (if needed), and assuring adequate quality
control will pay dividends.
