Ultrasonic Testing for Positive Displacement Pumps
Specialized Ultrasonic Testing programs for Positive Displacement Pump Reliability & Maintenance.
Why it matters
Key Benefits
Leak Detection
Airborne ultrasonic detection identifies pressure and vacuum leaks in positive displacement pumps 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 positive displacement pumps 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 positive displacement pumps detect high-frequency stress waves generated by metal-to-metal contact, friction, and impacts in the plungers, diaphragms, check valves, and packing. These signals appear weeks before vibration amplitude increases detectably.
Context
Challenge & Approach
The Reliability Challenge
PD pump valve leakage generates ultrasonic turbulence as gas or liquid flows past damaged seats, but the signal competes with normal flow noise through the pump. Packing blow-by produces ultrasonic emission at the packing gland that varies with system pressure and packing adjustment. Gear pump internal leakage across gear tips creates ultrasonic energy proportional to clearance and pressure differential. Bearing ultrasonic signals are modulated by pulsating loads from the reciprocating or rotating displacement elements. Multi-cylinder reciprocating pumps require per-cylinder evaluation to isolate faulty valves. Background noise from adjacent equipment and piping can elevate baseline ultrasonic readings.
Our Approach
We mount contact ultrasonic sensors on individual valve covers, packing gland areas, and bearing housings on each PD pump surveyed. Valve condition is assessed by comparing ultrasonic levels between suction and discharge valve covers on the same cylinder and across cylinders at the same compression stage. Elevated ultrasonic emission at a specific valve cover indicates seat leakage or spring failure. Packing gland ultrasonic levels are trended against packing adjustment history and system pressure. Bearing condition is monitored through dBu trending with heterodyned audio quality analysis. Gear pump internal leakage is quantified through ultrasonic intensity correlation with differential pressure. Reports include per-valve and per-cylinder ultrasonic data, bearing condition assessments, and repair prioritization based on leakage severity.
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Learn More →Ultrasonic testing detects bearing faults, lubrication deficiencies, internal leakage, and electrical discharge in positive displacement pumps. 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 positive displacement pumps. 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 positive displacement pumps.
Ultrasonic testing is effective on rotating and reciprocating components, pressure boundaries, and electrical systems associated with positive displacement pumps. 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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Pinpoint PD Pump Leakage Acoustically
Our ultrasonic testing isolates valve leakage, packing blow-by, and bearing faults in positive displacement pumps per-cylinder and per-valve.
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