Low Pressure Medium Frequency Lobe Pump Pipes with WagH.O.

PulseGuard offers pulsation dampers. | Please Phone 910-270-2737
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The COST $$ of GEAR PUMPS
with Various PulseGuard Dampeners

25% saving by a 2 connection damper - even if you do not flow through it.
but 50% saving by a 2 connection damper - when you do flow through it.
GO TO General/Prices/Installation/etc. Pages Gear Pumps with Pulsation Dampeners

A gear pump test rig, 29 teeth at 1740 rpm - 87 Hz.
Pressure wave passes a 1" T in 0.0000175 of a second. Someone specifies a 5 Liter (300 In3) single connection accumulator, for this 75Lt./Min. (20 USGPM), 25 Bar (350 psi) application.
A 300in3 off line Acc. does nothing other than increase softness, therefore - lower wave speed

2 pcs. 316 1"=T Sch 80 @ $53
$106
6 pcs. 316 1" 300# Flgs @ $15
$90
6 hrs. welding @ 62.50/hr. $375
3+hrs. NDE & Hydro. $200
Flgd. 40 Bar SS Acc. @ $1,156
3. Total $1,927

Next the "T" for the Relief Valve was saved and the three flanges and welding time, so there was a 25% installed cost reduction, and a 30% reduction in pulsation because of the direct line from pump to large diameter bottle.

1 pcs. "T" as above $53
3 pcs. Flgs. as above $45
Weld, NDE & Hydro. $310
Twin flange 316 Damper $997
2. Total $1,405

Finally, "third time lucky", the pressure ripple went into the pressure pulsation damper and completely disappeared. This time it was only a 120 in3 at less half the cost of the 300 in3 cccumulator, which had proved useless.

1 pcs. "T" as above $53
3 pcs. Flgs. as above $45
Weld, NDE & Hydro. $310
Small flo-thru Damper & flanges, 293+238 = $531
1. Total $939

Pressure travels 300 times faster than flow
So pulsation - flies straight past a "T"!

Because flow is so slow, there is time to flow up, come to a stop, and flow back down a "T" on the other hand, whatever the residual pressure pulsation level is, it will fly straight past a "T".
Mass of liquid in a pipe is transferred at not above 180 inches/sec or say 460 cm/sec		Pressure in a fluid travels at, Mach 1 (in Air) In harder substances (liquid) is transferred at up to 4000 MPH, or say 140,000 cm/sec.

CONCLUSION:- With 300% greater efficiency, because flow fluctuations & pressure pulsation are forced to see the inside of PULSEGUARD PULSE DAMPENERS, are more compact vessels and DO MORE WORK FOR A LOWER COST
hence the saying:-

Dampers that do, flow goes through, BUT pressure pulsation is caught