Ultrasonic Testing for Hydraulic Cylinders
Specialized Ultrasonic Testing programs for Hydraulic Cylinder Reliability & Maintenance.
Why it matters
Key Benefits
Leak Detection
Airborne ultrasonic detection identifies pressure and vacuum leaks in hydraulic cylinders 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 hydraulic cylinders 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 hydraulic cylinders detect high-frequency stress waves generated by metal-to-metal contact, friction, and impacts in the cylinder barrel, piston, piston rod, seals, and end caps. These signals appear weeks before vibration amplitude increases detectably.
Context
Challenge & Approach
The Reliability Challenge
Cylinder internal piston seal bypass produces ultrasonic turbulence at the piston location that is detectable through the cylinder tube wall, but signal strength depends on leak rate, pressure differential, and tube wall thickness. Rod seal leakage at low rates may not produce detectable ultrasonic signals. Cushion valve bypass during end-of-stroke deceleration is a transient event requiring timing-coordinated measurement. Cylinder tube surface condition affects ultrasonic transmission from internal leakage to external sensors. System pressure fluctuations during measurement create variable leakage rates and inconsistent readings. Background hydraulic system noise from pumps, valves, and piping may mask low-level cylinder leakage signals. Cylinder orientation and mounting affect sensor access and coupling.
Our Approach
We apply contact ultrasonic sensors to the cylinder tube at the piston location (determined from stroke position) and at both end caps during pressurized static hold conditions. Internal bypass is detected through elevated ultrasonic emission at the piston position compared to adjacent tube sections under differential pressure. dBu levels are correlated with approximate leak rates using calibration data developed from controlled leak testing. Rod seal areas are monitored during pressure application for leakage-related ultrasonic emission. Cushion effectiveness is assessed through end-cap ultrasonic measurement during deceleration events. We test at multiple stroke positions and pressure levels to map leakage severity across the operating range. Reports include piston seal bypass severity rating, rod seal condition assessment, cushion function verification, and cylinder rebuild recommendation with estimated remaining service life.
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Learn More →Ultrasonic testing detects bearing faults, lubrication deficiencies, internal leakage, and electrical discharge in hydraulic cylinders. 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 hydraulic cylinders. 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 hydraulic cylinders.
Ultrasonic testing is effective on rotating and reciprocating components, pressure boundaries, and electrical systems associated with hydraulic cylinders. 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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Test Cylinder Seals Without Breaking a Connection
Our ultrasonic cylinder testing quantifies internal piston seal bypass and rod seal condition without disconnecting hydraulic lines or disassembling the cylinder.
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