LIQUID DYNAMICS Ltd. offer Pulsation / Vibraton and Shock - Analysis & Diagnostics + Software Models Please call toll free USA 1-888-326-7377 WE HAVE PEOPLE - Not voice mail. --44-161-480-9625 UK

VOLUMETRIC PULSATION:

Characteristic

"NICELY ROUNDED" (Sexy as hell, gentle agitation, no stagnation, you know the system is still in the land of the living )

DESCRIPTION

i) This IS what recip. mfrs. like to pretend is meant by the word - wait for it ! -- Yes, you guessed it - "Pulsse-AAtion"
ii) A small disturbance as valve opens, gentle fall and climb back.
iii) Just a tad of valve reseat disturbance. Lovely.

a) CAUSE

The rate of mass transfer is Mom sine motion.

b) DETRIMENT

Unless the pipe is very long - The good lord only knows

c) SOLUTION

Stuff a condom in a can.

d) INPUT DATA NEEDED

Volume per stroke - AND - How much more gentle do theywant it ? --------- B U T This is really an exercise in futility. Because Just about all the other AMPLITUDES at FREQUENCIES will be far greater than the residual fluctuation from VOLUMETRIC PULSATION after the "condom in a can has some life breathed into it".

SO Unless the "engineer" is mistaken enough to limit his residual amplitude spec to --"-+?? Amplitude at SPM time number of displacers frequency" ----making a selection on the basis of volumetric pulsation must, you will agree, be a FARCE.

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Liquid Dynamics provides pipeline and pump user problem analysis, diagnostics, and prediction by software. For water hammer and shock solutions pulsation dampening and shock alleviating devices can be obtained from our associate websites PulseGuard and ShockGuard.

For Hardware see our associate websites:

www.PulseGuard.com and www.PulseGuard.co.uk for further information about pulsation dampeners and pumping systems.

www.Shock-Guard.com and www.ShockGuard.co.uk to find large gas bag vessels, jumbo bladders, float separator and big bellows type pipeline shock attenuators and expansion / contraction volume compensators.

www.Pulsation-Dampers.co.uk for more about pulse dampers in pumping systems and water hammer.

Water Hammer  and www.Shock-Alleviators.co.uk for more on water hammer, pump start up surge, shut down back flow, & valve closure hammer.

www.Accumulators-Hyd.com and www.Accumulators.co.uk for information about energy saving in pumping systems, standby emergency power, and safety shutdown systems.

www.Pulsation-Shock.com for a quick view of how each different type of pulse dampener is matched to a pump installation. Pumps make flow, system resistance to flow is pressure, systems make pressure and pressure pulsation.

www.Flow-Guard.com to find protection against excess flow. Guard against toxic spills when pipes burst, guard against gushers and fluid loss when hoses split, Flow-Guard guards against excess flow floods.