slurry PSV 1

[petrona]

Hi,
what kind of PSV is applicable to slurry discharge?
-solid suspension in liquid water with KOH
-total Solid 35000 mg/L
-Density: 1400 kg/m3

 

[moltenmetal]

Getting such a relief valve to relieve might not be such a big problem. Getting it to re-seat reliably WILL be a problem.

Perhaps a rupture disc is more appropriate, combined with some other controls to eliminate any operational overpressure cases.

 

[jamesbanda]

I've seen several charts which document the installation for different sevices.. the Parry relief valve handbook has such a chart.

If your slurry is hazardious you will be guided down the route of a bursting disc and relief valve. (For KOH that would probably be approprate).

alternatively if this is on a positive displacement pump you may choose for a high integrity (or hard wired) local trip on the pump discharge rather than a relief valve - i've seen this done many times.

 

[psafety]

Concur with jamesbanda, unless there is an absolute need for a relief valve don't use it, it'll work once as designed.

My first question can the pump discharge be blocked? If instrumentation is workable a quick risk accessment can determine if SIL is required.