Water Hammer

[hydraulicsman]

I'm interested to find out more about hydraulic system shock absorbers.
We have been performing some tests on a system that is subject to water hammer... by adding a bladder accumulator locally to the nucleus of the induced water hammer we can mitigate it's effects well... however, the limiting factor now appears to be the entry hole into the accumulator... if I can find a large entry hole unit, the inrush in/out flow will not be throttled as much. Actual size required is in the region of 2L capacity
Suggestions welcome.

 

[hydromech]

How large is large?

10mm...50mm...100mm?

For low pressure systems, you can make your own piston accumulator. Then apply whichever hole suits best.

 

[hydraulicsman]

I was thinking more diaphragm or bladder... Thouhgt a piston may have inertia problems... seal stiction etc.
Was wondering if there was large entry, small capacity accumulators.

 

[micalbrch]

A 2 L accumulator will have a connection size of approx. 1" (+/-). Is that enough for you? If so, I might have one or two manufacturers for you.

 

[IceStationZebra]

You should check out "pulsation dampers." Many of these have an angled inlet to direct the flow into the damper, which may let you get away with a smaller accumulator. And even if they are too small the idea is sound though it will add restriction to the system.

For example: pulseguard.com (no relation to the company, reference only)

ISZ