Pulsation Damper Location

[rickco007]

Hi all,

I read on most of the installation manual of a pulsation damper that it is recommended to install it as close to the displacement pump as possible.

I wonder what will the impact if I install near a sensitive system where the flow need to be non turbulence? Will that help to damper the incoming flow and pressure?

Best regards
Rickco

 

[bimr]

Anything that will dampen the speed of flow will decrease turbulence. With a PD pump, you are producing pulses. The pulses are moving at a higher velocity than a system with continuous flow.

 

[DubMac]

Pulses move at the speed of sound; and they are coming from the pump itself.

 

[rickco007]

Hi Bimr, Dubmac,

I do understand.
I am thinking if my supply flow is non turluence, by adding a PD near my equipement, will that help to regulate the flow and pressure.

 

[itdepends]

It will help with short term fluctuations in pressure but will have no impact on longer term/sustained disturbances. There will be a corresponding smoothing in flow which will be a function of the reduction in pressure movement and the shape of the downstream system curve.

By short term I mean changes that are <1 second.

As a chem eng/metallurgist the first part of any answer I give starts with "It Depends"

 

[rickco007]

Hi Itdepends,

So you mean that if in once every 20 second, the pump pump, it will be able to smoothen the flow, but if the pump keep pumping, it may not be able to help to smoothen the flow?

 

[bimr]

A PD pump has a pumping output similar to this curve from a peristaltic pump. The flow is not continuous, rather it is a continuous series of plug flow. The velocity and turbulence change with every pulse

The pulsation dampener will help to smooth out the flow.

 

[rickco007]

Hi Bimr,

My question is if I do not fix the pulsation dampener near my pump, but I fix it near my sensative equipment (example 25m away from pump), what is the impact?

Best regards
Rickco

 

[Duwe6]

My read is to dampen the pulsations as close to the source as possible. Remember, steel is highly elastic. Thus pulsations in the fluid will cause flexing of the pipe; not a good operating condition for anything [except deicing, maybe]. And that "speed of sound" mentioned is the speed in the fluid. In water, it is just under 5000 fps.

 

[bimr]

Pulsation dampers are normally applied immediately downstream of a reciprocating, positive displacement pumps. In situations where you are seeking to obtain more uniform flow, you might consider adding an additional dampener elsewhere in the piping manifold (depending on the arrangement of the piping).

http://www.modernpumpingtoday.com/i...iquid-systems-part-2/http://www.eng-tips.com/

 

[Compositepro]

Placing the dampener near the pump lessens the effects caused by inertia of the fluid in the pipes, thus reducing stresses and vibrations on the pump and pipes.And it will save energy. Placing a dampener near the end user will be most effective at maintaining a constant pressure at the user. Near the pump is the usual choice, but you can use both.

 

[rickco007]

Thanks guys!
You have provided lots of information.
Greatly Appreciate it.

Best regards
Rickco

 

[stanier]

Geho pumps I have installed usually have a suction bottle to eliminate pulsations on the upstream side of the triplex diaphragm pump as well as downstream accumulators.

ôThe beautiful thing about learning is that no one can take it away from you.ö
---B.B. King

http://waterhammer.hopout.com.au/

 

[rickco007]

Thank all.
I had actually make use of a pressure reducing valve to regulate my incoming pressure.
Seems to work out as fine.