The COST €€ of GEAR PUMPS with Various PULSEGUARD Dampers 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. Gear pumps of the internal and external types have pressure pulsation dampners for flow fluctuation and high frequency dampning. |
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| 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 |
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| 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 |
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| 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 |
See also: Gear Pumps Pulsation Damper / Straight, Spur, Internal |
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