Ultrasonic Testing for Reciprocating Compressors
Specialized Ultrasonic Testing programs for Reciprocating Compressor Reliability & Maintenance.
Why it matters
Key Benefits
Leak Detection
Airborne ultrasonic detection identifies pressure and vacuum leaks in reciprocating 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 reciprocating 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 reciprocating compressors detect high-frequency stress waves generated by metal-to-metal contact, friction, and impacts in the pistons, cylinders, suction and discharge valves, crossheads, and crankshaft. These signals appear weeks before vibration amplitude increases detectably.
Context
Challenge & Approach
The Reliability Challenge
Reciprocating compressor valves generate normal ultrasonic energy during opening and closing events, requiring comparison between identical valves on adjacent cylinders to identify abnormal leakage. Packing blow-by ultrasonic emission varies with ring condition, system pressure, and packing adjustment, demanding trending against established baselines. High-pressure compressors produce elevated background ultrasonic levels from normal gas flow through passages and ports. Multi-stage compressors have different pressure levels at each stage, affecting ultrasonic sensitivity. Valve cover material thickness and coupling surface condition influence measurement consistency. Rider band and piston ring wear changes cylinder pressure profiles and affects valve ultrasonic signatures.
Our Approach
We apply contact ultrasonic sensors to each valve cover (suction and discharge) and packing case on every cylinder. Valve condition is assessed by comparing ultrasonic levels between identical valves on adjacent cylinders at the same stage—a valve with significantly higher ultrasonic emission than its peers indicates seat leakage or plate failure. Suction versus discharge valve comparisons on the same cylinder identify which valve type is leaking. Packing case ultrasonic levels are trended against system pressure and compared across cylinders. We use heterodyned audio to qualify the character of ultrasonic signals—steady hissing indicates gas leakage, while clicking or tapping suggests mechanical impact. Reports include per-valve ultrasonic maps, packing condition assessments, and valve replacement prioritization ranked by leakage severity and cylinder criticality.
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Learn More →Ultrasonic testing detects bearing faults, lubrication deficiencies, internal leakage, and electrical discharge in reciprocating 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 reciprocating 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 reciprocating compressors.
Ultrasonic testing is effective on rotating and reciprocating components, pressure boundaries, and electrical systems associated with reciprocating 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 Leaking Valves Without Pulling the Head
Our ultrasonic valve testing identifies the specific valves leaking on your reciprocating compressors so you replace only what needs replacing.
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