American Oil and Gas Reporter - March 2016 - 58
SpecialReport: Gas Industry Strategies
FIGURE 1
Changing Amplitude Trend Values
As Compressor Shows Indications of Leakage
accelerometers on the valves, providing
automatic data correlation between temperature and vibration, and giving additional predictive monitoring capabilities.
As valves begin to leak gas, temperatures
rise. By monitoring individual valve temperatures as well as individual valve vibration signatures, the problem valve is
identified more easily.
The data collected provide a good indicator of high-frequency occurrences
such as flow turbulence and friction, and
show the flow turbulence that occurs as
each valve opens and closes, relating it
to a consistent time in each revolution in
58 THE AMERICAN OIL & GAS REPORTER
order to determine valve action. The transient capabilities also allow for the replaying of events in real time, permitting
further diagnostic capabilities.
Data Examples
Figure 1 shows the predictive benefits
of continuous monitoring. In this example,
the trend values, as well as the pattern
present in the circular waveform, change
as a valve shows indications of leakage.
Dealing with a form of flow turbulence
instead of impacting, it is clear that the
amplitude actually decreases when a valve
is not sealing properly. This is related to
the fact that the delta pressure is reduced
across an improperly functioning valve,
instead of the usual "surge" of gas as the
valve opens and closes.
Circular waveforms were used for pattern recognition in determining valve
health. The circular waveform plots simply
overlay one rotation on another, instead
of plotting in strip format. This particular
format enhances the repeating pattern
seen in each revolution.
By utilizing data collection, temperatures, and viewing the circular waveform
patterns, the user can determine the operational health of the individual intake
and exhaust valves. This information,
along with the associated trend values
from the peak-to-peak waveform, helps
to determine overall valve health as well
as the rate of degradation of a given
valve.
Adding the vibration data along with
the individual valve temperatures helps
to pinpoint issues and allows for proper
scheduling of repairs to prevent catastrophic valve-related failures on recip-
American Oil and Gas Reporter - March 2016
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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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