PulseGuard Ltd. and Inc.
PulseGuard Ltd. offers pulsation dampers | Please phone 44(0) 161-480-9625
We have people not voicemail | Call toll free UK 08080-567-7423
Fluid Flow Control Animations
Fluid Flow Control Animations

MULTIPLEX PLUNGER PUMP with WaveGuard & PumpGuard
pplication Story

PDF of this page
Septuplex, Quintuplex, even TRIPLEX pumps
Have small, but high frequency flow fluctuations
WaveGuard & Multiplex for 2" thru. 8" discharge pipe lines. No moving parts, and no open cell foam to clog or degrade.
INSTALLATION: Do not use direction changes tighter than 5D bends between dampers and pumps. Keep the distance to less than 15 pipe diameters. Use the rule of 2:6:3:1 for relative pipe cross sectional bore area. Where 2 is the supply, 6 is damper to pump suction, 3 is discharge to damper, 1 is the system
PumpGuard is for 3", 4", 6", 8", 10", & 12" suction lines. No cushion pre-fill is required.

Piping system liquid mass, viscosity, length, diameter, make flow fluctuation into pressure pulsation
PIPE PROBLEMS: 1, 2, 3 (below)
Reverse Osmosis "RO" systems, like many other systems, are packaged and have short pipes. Short pipes, like short anythings, have natural HIGH FREQUENCIES

TECH Notes: it is not necessary to read the areas shaded in this color. RPM x Number of displacers x 2 (because there is a secondary bump from the overlap of one displacer tot the next) x say a minimum of 3 valve beats, then all divided by 60 (60 seconds in a minute), = flow fluctuation forcing frequency in Hertz, abbreviation "Hz". Compare this figure with eh system you chose, is roughly according to the effective compressibility, 4600 ft/sec divided by twice pipe length ft. (end & back). Or 1400 / 2 x M = Min. Acoustic Hz. PUMP Hz. PIPE Hz is never to be a whole Number

1. The water was not pure.
2. The pipes vibrated, the shaking made more pressure spike, the pipe spikes built on the pump spikes & amplified
3. Now the high amplitude at high frequency robbed 70% of the life from the ultra filtration membrane.

Click on dampers or pump for associated pages
power pump with a WaveGuard and PumpGuard, frequency charts - detailed schematic
ANSWER: To prevent the system response reflecting back to the pump, and from increasing the pressure spikes, a WaveGuard WAG was installed which intercepted the forcing action of the pump and isolated it from the high frequency response of the short pipe system.

photo of a power pump with a WaveGuard and PumpGuard
Click on dampers or pump for associated pages
Irrespective of pipe length the frequency from the pump was 80 Hz, the pipe run was 8.8 *

RESULTS: 1, 2, 3, & 4
1. Four times the ultra filtration membrane life.
2. The water was pure
3. The system stopped springing leaks.
When a
PumpGuard cavitation preventor was added to suction it, it was possible to double the flow rate by changing the driven pulley.
*8.8 Meters, say 57.7 feet there and back, at 4600 ft in a second, dived by 57.7 ft. = 79.7 acoustic/pressure waves coming back onto the pump per second. They return at almost the exact instant the pump tries to send out another one. The system is an amplifier.
That is one reason for RESONANCE.

PUMPS MAKE FLOW, & flow fluctuations, SYSTEMS MAKE PRESSURE, & PRESSURE PULSATION; ask pump people about flow, ASK DAMPER PEOPLE about pressure pulsation


High Hz. - Comments Liquid Dynamics International by - "Pulse-Doctor" Analytical, Diagnostic and Software services

Neither the PumpGuard cavitation preventor, nor the WaveGuard resonance preventor, require any pre-filling with air or nitrogen at all

Return to the top
Return to More Pumps to more pumps

Return to the beginning of PulseGuard, pulsation dampeners

Selecting Pulsation Dampeners for Different Pump Systems.
Flow through pulsation dampers are at least 3 times more efficient than T off line accumulators.
Dampeners that do, flow goes through, but pressure pulsation does not.
PulseGuard Pulsation DampersThe Smooth Flow People

Call Toll Free 1-888-DAMPERS (326-7377) / See also: Pulsation-Dampeners.com for a pulsation dampener.

Fluid Flow Control Fluid-Flow-Control.com The Fluid Flow Control Source Pumps Accumulators Filters Dampers Heat Exchangers Valves Mixers P.I. / Pressure Indicators Controls Meters Vessels