Ultrasonic Testing for Centrifugal Compressors
Specialized Ultrasonic Testing programs for Centrifugal Compressor Reliability & Maintenance.
Why it matters
Key Benefits
Leak Detection
Airborne ultrasonic detection identifies pressure and vacuum leaks in centrifugal compressors systems that are inaudible to the human ear. Locating leaks quickly reduces energy waste and prevents process quality problems.
Bearing Lubrication Optimization
Ultrasonic monitoring of centrifugal compressors bearings provides real-time feedback during grease application to prevent both under-lubrication and over-lubrication. Proper lubrication extends bearing life and reduces friction-related energy losses.
Early-Stage Fault Detection
Contact ultrasonic measurements on centrifugal compressors detect high-frequency stress waves generated by metal-to-metal contact, friction, and impacts in the impeller, diffuser, journal and thrust bearings, dry gas seals, and balance piston. These signals appear weeks before vibration amplitude increases detectably.
Context
Challenge & Approach
The Reliability Challenge
Centrifugal compressor casing joints and piping connections operate at high pressures, and even small leaks produce strong ultrasonic signals that can be detected from a distance. Dry gas seal leakage monitoring requires distinguishing normal seal gas consumption from excessive primary seal wear. Casing horizontal joint leaks may be intermittent and temperature-dependent as thermal expansion changes bolt loading. Background ultrasonic noise from high-velocity gas flow through the compressor and piping system is high. Labyrinth seal leakage is normal but increases as seals wear, and baseline trending is necessary to detect changes. Lube oil system components (pumps, control valves, coolers) generate flow-related ultrasonics that can mask fault signals.
Our Approach
We perform airborne ultrasonic surveys of compressor casing joints, piping flanges, valve packing, and instrument connections to detect pressurized gas leakage. Leak signals are quantified in dBu and converted to estimated leak rates using calibration data for the gas and pressure conditions. Dry gas seal vent flow is monitored ultrasonically and compared against normal consumption rates. Contact sensors on bearing housings assess lubrication condition through dBu trending and audio quality analysis. Casing horizontal joint integrity is evaluated at multiple points along the joint length. Piping connection surveys follow systematic patterns to ensure complete coverage. Reports include leak location mapping with estimated leak rates, seal condition assessment, bearing lubrication status, and repair prioritization based on safety, environmental, and reliability impact.
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Learn More →Ultrasonic testing detects bearing faults, lubrication deficiencies, internal leakage, and electrical discharge in centrifugal compressors. Airborne ultrasonic detection locates pressure and vacuum leaks at joints, seals, and connections. Contact ultrasonic measurements identify early-stage metal fatigue and friction before vibration levels increase measurably.
Ultrasonic testing detects high-frequency stress waves that appear earlier in the fault progression than vibration amplitude increases in centrifugal compressors. It is most sensitive to friction, impact, and turbulent flow, while vibration analysis excels at identifying specific fault types through frequency patterns. The two technologies are complementary rather than interchangeable for monitoring centrifugal compressors.
Ultrasonic testing is effective on rotating and reciprocating components, pressure boundaries, and electrical systems associated with centrifugal compressors. It is particularly valuable for slow-speed equipment where vibration signals are too weak for reliable analysis. Access to measurement points and background ultrasonic noise levels are the main factors that determine measurement quality.
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Find Compressor Leaks Before They Find You
Our ultrasonic surveys detect gas leakage, seal degradation, and bearing problems on centrifugal compressors with quantified leak rate estimates.
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