American Oil and Gas Reporter - March 2016 - 59
SpecialReport: Gas Industry Strategies
FIGURE 2
Circular Waveforms Associated
With Healthy and Suspect Valves
Healthy Valve
also is evident that the event is less
defined and shows a large amount of energy present during the entire revolution.
Notice the energy present at approximately
225 degrees (revolutions). These waveforms also can be viewed in standard
strip format, if preferred.
Continuous monitoring of valve health
on reciprocating compressors provides
significant short- and long-term benefits.
Providing operators, maintenance and engineers with valuable, reliable, and easy
to evaluate data on the health of compressor valves means giving them the
tools they need to keep the organization
running as efficiently and reliably as possible. With valuable analysis data at their
fingertips, compression and operations
staff can stay ahead of problems and remain focused on production.
❒
Suspect Valve
rocating compressors.
This form of continuous monitoring
of valves works well regardless of flow
variance. Because the system monitors
high-frequency flow turbulence, the heart
of the data is in the consistency of the
amplitudes and pattern of the turbulence
data. If there is liquid mixed with the
gas, the amplitudes will be higher, but
the patterns will remain consistent. If,
however, the valve is leaking, the pattern
will change, while the amplitude remains
consistent.
This pattern change can be seen in
Figure 2. In the circular waveform graphs,
there is a significant difference in the
pattern. This shows that the valve is not
seating properly because of the loss of
the distinctive sharp crisp occurrence that
is present in the top waveform.
Notice, in particular, the "crisp" event
that is present on the upper plot. This
can be related directly to the phase angle
of the compressor crankshaft and the
timing of the valve. On the lower plot, it
SCOTT BASSETT is an applications
development specialist with Emerson
Process Management's application and
customer service department in Knoxville,
Tn. He previously served the company
as an online service engineer. A veteran
of the U.S. Air Force, where he performed
aircraft maintenance duties, Bassett's
professional experience includes vibration
analysis , diagnostics, maintenance and
fabrication of rotating equipment.
MARCH 2016 59
American Oil and Gas Reporter - March 2016
Table of Contents for the Digital Edition of American Oil and Gas Reporter - March 2016
Contents
American Oil and Gas Reporter - March 2016 - Cover1
American Oil and Gas Reporter - March 2016 - Cover2
American Oil and Gas Reporter - March 2016 - 3
American Oil and Gas Reporter - March 2016 - Contents
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American Oil and Gas Reporter - March 2016 - Cover3
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