POWER February 2016 - 46

OPERATIONS & MAINTENANCE
7. Robot inspector. The submersible robot used by the Mistras Group to inspect the
tank interiors carried a television camera for visual reconnoitering as well as the PEC pulser and
receiver probe that detected variations in thickness of the carbon-steel walls. Courtesy: NAES
the acceptable range.
The PEC findings enabled us to budget
and properly plan for a single tank drain and
repair. We would otherwise have fallen back
on the costly and labor-intensive recourse of
draining both tanks during our annual outage
and responding reactively to the results of
conventional destructive testing.
Better Long-Term Planning = Less
Risk of Major Failures
Through the use of advanced technologies
not commonly deployed during routine outages,
we were able to catalog and baseline
conditions inside GRE's least accessible
components. We can now plan more accurately
for the long term and better target our
future outage efforts.
Although skeptical at first, GRE's owner,
of test specimens using a different method.
The PEC inspection showed the demineralized
water tank to be in great condition, with
wall thickness and epoxy liner totally intact.
However, it also confirmed that the makeup
water tank was showing signs of liner failure,
with active corrosion of the steel wall. Fortunately,
wall thicknesses still measured within
Granite Ridge Holdings LLC, much appreciated
our choice of nondestructive sensor testing
to do these 10-year assessments. The company
not only realized a cost savings up front over
using conventional destructive methods but
also substantially mitigated the risk of being
blindsided by a catastrophic failure. ■
-Larry Hawk, NAES Corp., is plant
engineer at Granite Ridge Energy,
Londonderry, N.H.
CIRCLE 13 ON READER SERVICE CARD
46
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POWER February 2016

Table of Contents for the Digital Edition of POWER February 2016

Contents
POWER February 2016 - Cover1
POWER February 2016 - Cover2
POWER February 2016 - Contents
POWER February 2016 - 2
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POWER February 2016 - Cover3
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