Fluid Power Journal

Banging Damages Pipes and Fittings

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training

A manufacturer of various size steel drums had a problem with shock—banging—that caused welded pipe and fittings to crack and leak. A hose and fitting distributor replaced the A and B lines on the two opposing “beading” cylinders, adding additional high-pressure hose and hold-down clamps on the hose. This change reduced the leaks but seemed to increase the banging when the cylinders started to retract.

The hydraulic power unit had pilot-operated check-valve modules with a decompression feature under the pilot-operated directional valves, which had an internal pilot pressure orifice smaller than standard.

Any idea what they needed to do to reduce the system shock to an acceptable level?

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