MAINTENANCE & REPAIR
performance. Coupled with the pretest
results, this is the only accurate way to
predict frequency of inspections required
to comply with plant PSM requirements.
CONs: There are two main downsides
to a full inspection and overhaul; additional time and cost of repair. To properly
overhaul any PSV, there are certain
requirements that must be followed in
order to provide a “VR’d” valve. This
method can take 3-4 times longer (time
may vary based on the size and condition
of the valve) than that of a test only.
Additionally, there are additional labor
costs for the repair, as well as costs associated with transportation, plant labor
(for removal and installation) and unit
downtime. These factors need to be taken
into consideration along with production
schedules to maintain a true and accurate PSM program.
PSV Management Software
Determining the methods and frequencies of inspection is not an easy task. As
stated, there are many factors—not just
the “pop-point” of a PSV—that affect
whether inspection frequencies should be
shortened, extended or maintained.
Managing all of this information can
be a daunting task. Having an internal
database or using a repair/testing facility
that is equipped with the proper database
is essential to a successful PSV program.
The ability to manage this information,
help predict frequencies of repair, and
assist in tracking history and total life
cycle cost for each PSV is a critical component of the PSM process.
There are many methods of PSV inspection that are used to meet end-user PSM
requirements. Determining which
method is the safest and most practical is
not to be taken lightly. Although cost will
always be a factor in the decision, safety,
quality and efficiency considerations
should play an equal (if not greater) role
in determining PSM frequencies and
A PSV is a plant’s last line of defense
when it comes to protecting life and
property. A properly maintained PSV
will ensure that the end user, the community and the environment will not be
exposed to equipment failure resulting in
a catastrophic situation.
BART COLLINS is the General Manager for Preci-
sion Services, Inc. of Louisville, KY and Corporate
Operations Manager for its parent company, Pre-
cision Pump and Valve Service, Inc.
(http// ppvs.com) of Charleston, WV. Reach him at
502.499.8250 or email@example.com.
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