5 replies to this topic

[m42364236k]

Dears

i want to know where is the best place for location of pulsation dampener ?upstream of plunger pump psvs or downstream

in our project we have plunger pump .this pump has pulsation dampener in discharge line and also this pump has psv in the discharge line? 

where is the best location of dampener .upstream of pump psv or downstream of pump psv?

is it better to install downstream of psv fo protecting the pulsation dampener from high pressure

 

 

thanks

mike

[fallah]

mike,

 

A discharge pulsation dampener normally removes the pulses from its downstream line. If the PSV is located after discharge pulsation dampener may be subject to unstable flow pattern due to such pulses then cannot do the job properly. Therefore the PSV in discharge line of a reciprocating pump should be installed upstream of the relevant pulsation dampener...

[m42364236k]

dear fallah:

 

if we have  a blockage in  the discharge of the pump, in this situation is it not better to put the pulsation upstream of PSV to protect the pulsation from over pressure?

 

Thanks.

[fallah]

mike,

 

The PSV at discharge line before pulsation dampener can protect the downstream system in which such dampener is located if had properly been set because it is closer to the pump as pressure source than being located downstream of the dampener. In fact, as soon as the blockage in pump discharge happens, whole blocked segment between the pump and blockage point will be in stagnant conditions and there might be no matter the PSV being located at downstream or at upstream of the dampener, but in normal operation as I mentioned it would be better to be installed at upstream...

[m42364236k]

Thanks fallah for your good answer.

 

i have another question:

 

in my project we have control valve.  Upstream pressure of the control valve is 50 barg, while downstream is 4 barg.  Down stream of this control valve  in the line we have a PSV that is designed for blocked outlet scenario, but this PSV is not spared. 

 

My question is does it need any spare?  If yes, do you have any standard for this case that mentions a need for a spare PSV?

 

 

Thanks.

[fallah]

mike,

 

Considering a spare for a PSV isn't a mandatory requirement in any code and standard. It's just in some engineering practices that reuire considering a spare for a single or multiple PSV(s)...