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josej
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Join Date: Mar 2008
Location: Mumbai
Posts: 250
Good Answers: 2

Safety Valve Setting

08/26/2008 12:56 AM

Hello Frnds,

We are having a pressurised feed (Crude Oil) tank with design pressure of 10"WC TO -2 "Wc with safety valve mounted on top of it with set value of 8 " WC & -1 " WC

I want to know how PZV will Work/Logic on the negative side.

Regards

Jose
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Safety Valve Setting

08/26/2008 4:21 AM

It can be expected to operate at -1"wc if correctly installed and maintained.

1"wc is well within the normal swings of barometric pressure due to local weather conditions.

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josej
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Join Date: Mar 2008
Location: Mumbai
Posts: 250
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#2

Re: Safety Valve Setting

08/26/2008 7:50 AM

Dear Frnds,

Thanks for Inputs ,As mentioned in the link , We are having same application tank is being pressurised with Fuel gas .

I guess In PID PZV should Be PV

Regards

Jose
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Anonymous Poster
#3
In reply to #2

Re: Safety Valve Setting

08/27/2008 11:23 AM

just a little curious,doesn't the valve sales company or manufacturer advise on techical information.
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srini
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Join Date: Mar 2008
Location: Houston, Texas
Posts: 101
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#4

Re: Safety Valve Setting

08/27/2008 1:28 PM

The tank is designed for 10"WC and the set pressure is 8" WC.

If this is a pallet loaded type relief valve it takes 100% over pressure before the valve lifts full.

Unless the valve is grossly oversized the valve may not reach the full capacity required if this is weigh loaded device

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