Please first consider whether the addition of pressure vessels to your piping system, can be avoided completely.

A. Can the need for pump start up surge prevention be made unnecessary?

Please Quote

1.) To start a pump without a surge, start the pump slowly. If you specify a pressure that must not be exceeded Liquid Dynamics will quote for working out how slowly you must start your pumps, for you.

Please Quote

2.) Start as normal, but allow the flow to by-pass back to suction against a gradually increasing resistance of a slow closing valve in the bypass line. If you state the space available, and the pressure that must not be exceeded, - Liquid Dynamics will quote the by-pass system for you.


B. Can the need for valve closure shock prevention be made unnecessary?

Please Quote

1.) To close a valve without a shock, close the valve more slowly, when you specify a pressure that must not be exceeded, Liquid Dynamics will quote for working out how slowly you must close your valve, for you.

Please Quote

2.) Stop the flow going through the fast closing valve in the normal way, but first open another valve in a smaller line from a "T" immediately ahead of the fast closing valve, this line will be piped back to a point nearer to point of volume supply. State the space available and the pressure that must not be exceeded.
Liquid Dynamics will quote for determining the back-pass system dimensions for you.

C. Can the need for pump shutdown back-flow hammer prevention be made unnecessary?
1.) To stop a pump, without a back-flow hammer, slow the pump down gradually; or de-clutch the pump from its driver & allow the pump to spin down, while the inertia of the mass flowing away from the pump pulls liquid through the pump.

Please Quote

2.) If you can not decouple the pump drive, then provide a "suck-by" circuit, allowing the void that is sucked out behind the liquid that continues to travel away from the pump, to be filled by sucking past the pump. Liquid Dynamics will quote for establishing the dimensions of the "suck-by" circuit, for you.

**Additionally, Include pressure wave speed (acoustic velocity) m/s when available.

When neither 1 nor 2 of A, B, C, above, "preventive methods" are possible, we can provide a list of companies who can provide vessels suitable for the duties established by a ShockView model of the data that you provide to Ldi, as below.

50e-6
@ + 40 C 19.6e-5
11.389E-4