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INTERPRETING
OSCILLOGRAPHS
Pub 2 Main Menu

6 examples

Gear & Packed Plunger Systems

Dosing, Air Op. &"Metering" Systems

Plunger & Valve Motions

Multi Plunger & Centrifugal Systems

Acceptable Maximums

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LDi Pulsation Analysis - target image Triplex reciprocating plunger pump - analysis of motion, valve action mass oscillation, velocity jump, membrane response

To understand the normal pulsation signature of the triplex test shown here it is necessary to examine the plunger and valve motions that cause the mass transfer velocities, before study of pressure response plot A. & discharge plot B.

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(note below in graph says) Bar 1 NOTE:- Log scale change - otherwise shock amplitude would take the entire page.
Graph
Graph
From report by Yuri V. Gerasimov, Technical Director Liquid Dynamics Inc. March 1994. Subject German pumps for Exxon. Cause the effect review M. Packer.

 
Strokes of a triplex piston pump displacement or forward stroke, suction or backwards stroke Pressure generation against system resistance inside the plunger chamber Suction check valve stroke, note the opening delay of 28 ms during the decompression of the red cylinder Suction mass flow kg per second caused by pressure difference, supply line to in pump cylinder Suction system pressures excited by the velocity jump from valve delay and mass oscillation Discharge check valve movement, note the overshoot and rebound, indicating valve stop allowing more than 25% of critical diameter travel. Discharge mass flow from the individual cylinders, then combine for theoretical steady state. Discharge pressure at check valve outlet, response to mass decompression explosion and Joukowsky shock. Note: Log scale change - otherwise shock amplitude would take the entire page. Individual dampeners per cylinder, note stiff “FlexFlon” membrane stroke response to high frequency pulsation
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Liquid Dynamics International provides pipeline and pump user problem analysis, diagnostics, prediction by software, pulsation analysis, piping system analysis, and piping system simulation. For water hammer and shock solutions pulsation dampening and shock alleviating devices can be obtained from our associate websites.

PulseGuard Inc., and Ltd. for further information about pulsation dampeners / pulsation dampers.
PulseGuard. USA: Pulsation Dampeners | Pulsation-Dampeners.com: Pulsation Dampeners
PulseGuard Limited: Pulsation Dampers | PulseGuard für Deutschland: Pulsationsdämpfer

Large pressure vessels, jumbo bladders, float separator / big bellows type pipeline surge attenuators and
expansion / contraction volume compensators, surge alleviators, and shock alleviators.
Shock-Guard. USA: Surge Alleviators | Water-Hammer.com: Water Hammer
ShockGuard.co.uk: Shock Alleviators | Suction-Stabilizers: Suction Stabilizers

Information about energy saving in pumping systems, standby emergency power, safety shutdown systems,
hydraulic accumulators, and hydropneumatic accumulators.
Accumulators-Hyd: Hydraulic Accumulators
Accumulators.co.uk: Hydropneumatic Accumulators | HydroTrole: Hydraulic and Control Engineering

Protection against excess flow. Protect against toxic spills when pipes burst, guard against gushers and fluid
loss when hoses split. Flow-Guard against excess flow floods with flow fuses and breather bags.
FlowGuard: Flow-Guard - Flow Fuses and Breather Bags

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