LDi - Water Hammer and Shock Analysis, Diagnostics, and Prediction by Software.

ACOUSTICS:

Characteristic

"FIXED FREQUENCY" & "NUL
PERIODS BETWEEN SPlKFS"

DESCRIPTION

i) Sharp spikes
ii) Flat pressure between them
iii) First one starts at an elapse time equal to speed of sound for effective bulk modulus (of liquid + absorbed gas and the pipe modulus of elasticity) and twice the length (There and back) to the first sharp 90 deg. corner .

a) CAUSE

Pipe from point of supply too large diameter not dissipative enough, and too thick a wall. PLUS The initial jerk of the liquid due to lost angle of suction displacement, to start it off . Perhaps, lack of 100% volumetric efficiency. Most often experience with highly gas absorbed liquids . Here for a pump sucking at 200 spm per cylinder from a 70 feet supply line.

b) DETRIMENT

May start to drive the suction check valve up and down. Valve life and Pipe shake.

c) SOLUTION

Prevent it from getting stated in the first place.
So sell a "PulseView" analysis. Re run the pipes.
Or use a suction "Hydraulic Isolator"

d) INPUT DATA NEEDED

See 8 pages of advice and hints "PulseView" analysis.

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.