Situation:
While investigating efficiency envelope issues, a large
compressor was found to be operating outside design
parameters. The inlet piping configuration was identified to
be different than what the license holder recommended.
Stress analysis of the recommended configuration and the
existing design showed that the potential for compressor
nozzle load exceedence existed, which could contribute to
the identified efficiency envelope issues. However, the
severity of an exceedence could not be quantified by
calculations alone.
Strain Gage Installation
Solution:
Strain gages were installed on the piping at the
compressor inlet while the unit was operating. The unit
was then shut down for scheduled maintenance allowing
for piping nozzle load changes to be measured. Strain
data was also collected on startup, while shut down and
during operations. Piping supports were carefully
observed during shut down and start up to determine
displacements and any gap closure changes. This data was
then used to determine the exact compressor nozzle
loading during operation for comparison to the
compressor manufacturer’s recommended limits.
Piping Displacement Measurements
Benefits:
Measuring the compressor nozzle loading directly removed
the approximations which are inherent in any analysis
technique. Using the field measurements along with the
analysis results allowed for a complete understanding of
the system’s behavior with confidence. Argos Engineers
is ready to partner with your operations personnel. Use
field measurements for strain, displacement, vibration,
temperature, or some other physical parameter to remove
guess work. Let us provide the field measurements needed
to make operating decisions with certainty.
