Vibration Analysis for Positive Displacement Pumps
Specialized Vibration Analysis programs for Positive Displacement Pump Reliability & Maintenance.
Why it matters
Key Benefits
Valve Impact Detection
Time-synchronous vibration capture identifies worn or leaking check valves in positive displacement pumps by comparing impact signatures against known-good baselines. This prevents loss of volumetric efficiency and downstream process upsets.
Pulsation Resonance Mapping
Spectral analysis separates normal pulsation harmonics from structural resonance in positive displacement pumps. Identifying coincident frequencies prevents fatigue cracking in piping and support structures.
Plunger and Packing Wear Trending
Envelope analysis isolates mechanical fault signatures beneath dominant pulsation energy in positive displacement pumps. Trending these amplitudes over time reveals progressive plunger and packing wear before leakage becomes visible.
Context
Challenge & Approach
The Reliability Challenge
PD pumps create high-amplitude pulsation harmonics at pump speed × number of plungers, which dominate the spectrum and can mask bearing or gear defects. Valve impact events are transient and require time-synchronous capture to isolate. Pulsation dampener degradation shifts harmonic amplitudes in ways that mimic internal wear. Diaphragm pumps generate low-frequency pressure pulsations that couple into piping resonance, complicating structural measurements. Gear pumps produce gear mesh frequencies that overlap with flow pulsation harmonics.
Our Approach
We use high-frequency accelerometers (minimum 10 kHz range) with time-synchronous averaging locked to pump RPM to separate pulsation harmonics from mechanical faults. Envelope analysis targets bearing defect frequencies beneath the pulsation energy. Dynamic pressure transducers at suction and discharge quantify pulsation levels per API 674 or API 675 limits. We compare valve impact signatures in the time waveform against known-good baselines. Cepstrum analysis identifies uniform spacing from repetitive impact events. Reports include amplitude trending, fault identification, and severity classification.
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Learn More →Vibration analysis detects mechanical faults in positive displacement pumps including valve wear, packing leakage, diaphragm rupture, and pulsation damage by analyzing frequency domain signatures specific to each component. Bearing defect frequencies, running speed harmonics, and component-specific patterns such as those related to the plungers, diaphragms, check valves, and packing are all identifiable through proper spectral analysis techniques.
Collection frequency depends on equipment criticality and operating conditions. Critical positive displacement pumps in continuous service typically require monthly vibration surveys at minimum, with more frequent collection warranted when trending indicates a developing fault. Online monitoring systems provide continuous data for the most critical assets.
Standard practice uses triaxial accelerometers mounted at each bearing housing to capture radial and axial vibration in positive displacement pumps. High-frequency enveloping sensors may be added for early bearing fault detection. Proximity probes are used on equipment with sleeve bearings to measure shaft relative vibration and orbit patterns.
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Our vibration programs cut through pulsation noise to find the mechanical faults that actually threaten your positive displacement pumps.
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