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Step-down pressure of demin water line

Step-down pressure of demin water line

Step-down pressure of demin water line

(OP)
I am looking for options to reduce the demin water pressure from a 8 barg header to about 5 barg for a downstream process unit. The downstream unit has been designed to work with a low pressure rating and there is a relief valve set at 5.5 barg. Anybody got any sugestions on what can be used to do that? Thanks.

RE: Step-down pressure of demin water line

A control valve with a downstream pressure controller?

RE: Step-down pressure of demin water line

(OP)
Thanks, TD2K. Is a control valve inevitable for a liquid service?

RE: Step-down pressure of demin water line

I'm not quite sure what you are asking.  I could assume the 8 barg and 5.5 barg pressure ratings are design pressures since you have a PSV set at 5.5 barg on the LP system.

Do you need to reduce the operating pressure?  Are you trying to prevent the PSV from opening?  

I don't know what your flowrate is to the lower pressure system but a control valve would be a pretty common solution.  The dP across an RO will vary as the flow rate changes.  The dP is likely too low for a hydraulic recovery turbine.  We really need some more information on your system and what you are trying to achieve.

RE: Step-down pressure of demin water line

(OP)
Sorry for the lack of information. The primary objective is to prevent the RV from lifting. So I guess a control valve will be a solution.

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