Pulsation Dampeners for Vane Pumps

Curing resonant pipe "whine" in vane pump systems at:
1. Low frequency, 2. Medium frequencies, 3. High frequencies
If you must have the higher cost of a single connection “dampener” then at least go to the original PipeGuard series, it is far less expensive than any of its copies.

The source of the disturbance that is magnified into audible pulsation by the pipe system is from "X". As the vane passes over the end of the port slot, there is a pressure peak from liquid trying to escape.

FlexOrber: for systems requiring cleanliness, LDi “FlexFlon” or DuPont Teflon, plus polished 316ss and flow through flushability in place. Piping: “Texas style” – longhorns. A quieter pump would have 7 or 11 vanes. PTFE diaphragms are “stiff” and generally only respond up to a maximum frequency of 30Hz. Check your pulse frequency before selecting Teflon. Unlike “volumetric flow fluctuation” accumulation, or protection from “acceleration head loss or acceleration head generation” on the discharge of a reciprocating machine, preventing the pressure response of a system from feeding back to a pump and amplifying the input signal, requires the interception of pressure waves. Pressure travels at thousands of MPH, so an in line flow through device is a bare minimum requirement.

PipeHugger: for up to 150Hz. For medium frequencies and with EPDM, Buna Nitrile, Hypalon, or Fluoro elastomers, etc. bladders. Piping: “Louisiana style” – one out of it and one coming at you. The higher the frequency, the less important the volume of Nitrogen or air cushion becomes. Conversely, the most important it is that:-
A). There is a good volume of liquid to deaden the pressure activity. B). There is nothing close to the inlet, for a transient pressure spike to bounce back from. C). As a pressure spike explodes through an orifice into a large chamber, it dies away exponentially with distance traveled, so the diameter of the vessel is of prime importance, and should be preferably 8+ times the diameter of the exit hole.
For all the above reasons, our original 1965 gas bag accumulator, PipeGuard, copied by so many, is unsuitable in its single connection form.

Pulsation dampeners with no moving parts, no foam to degrade or clog

"Maintenance free dampeners" An admission that pulsation is acoustic not volumetric.

WaveGuard: for high, medium, and low frequency pressure pulsation. The answer to high frequency low volumetric pulsation, for clean liquids. Note: A dominant frequency of say 300 Hz, may mean nothing more than, that there is a major pipe node that is 15ft. Long, i.e. Frequency depends on distance. Please see the other WaveGuard range types designed for contaminated systems. For high efficiency “acoustic” dampeners where some delta P is acceptable, please refer to Wag/HO series.

The Ball path Disperser Guards against pressure waves propagation. By causing the pressure waves to travel down many paths of different lengths, through the ball pack, the instant at which they emerge from the other end of the WaveGuard, is spread over time. Spreading the time base, decreases the pressure height of the pulsation.

Pulsation Dampener Selection for Vane Pumps

When pipes are larger than necessary for 2 to 10 ft/sec flow velocity (according to cP.) there is no amplitude dissapation; audible whine, and with long pipes "shake", may occur. An acoustic decoupler will generally suffice.