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Participant

Join Date: Oct 2012
Posts: 4

Looking for Gas Proving System Design

10/03/2012 12:49 AM

Dear all,

I am looking for information about gas proving system. It's very helpful if someone can give me an example of its P&ID or design basis or what standards I should read. Here, I am dealing with Natural Gas.

Can u guys help me?

Thanks

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Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
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#1

Re: Looking for Gas Proving System Design

10/03/2012 4:12 AM

Can you describe what is to be proved about the natural gas? Pressure, flow, that it's natural gas rather than something else, etc.? I'm not familiar with your context.

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Power-User

Join Date: Mar 2008
Location: Mumbai
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#2

Re: Looking for Gas Proving System Design

10/03/2012 11:15 PM

Hi ,

You can use a Z meter Configuration ( Two Ultrasonic Flow meter ), One for measuring and other for Verifying .

Package Vendor Provides Info ( P& ID )

Regards

Jose

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Associate

Join Date: Jan 2011
Location: Rotorua, New Zealand
Posts: 30
Good Answers: 1
#3

Re: Looking for Gas Proving System Design

10/04/2012 3:49 AM

There are several systems available on the market. I am presuming that you are doing a valve proving step as part of a gas or oil burner start up.Try googling the Durag AD2H, but there are a number of them on the market. Get a TUV approved one.

A good standard to read, because it is by far the best, is the Australian AS3814. You could also use the American NFPA 85. Section 1 Single burners or Section 2 multiple burners.

The device is normally fitted just prior to the burners. The wiring does not need to be anything special. This is not a hazardous zone. If the above does not cover your question, be more specific.

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#4

Re: Looking for Gas Proving System Design

10/04/2012 3:57 AM

If by gas proving system you mean a system which checks that the gas valves on an automatic burner are not letting gas leak passed them then forget designing one and buy one off the shelf which has been through an approvals house for testing. Dungs, Kromschoder and Honeywell all make them. One of the Dungs units simply bolts onto the side of their multiblock twin solenoid and governor.

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Active Contributor

Join Date: Apr 2012
Posts: 22
#5
In reply to #4

Re: Looking for Gas Proving System Design

11/22/2013 6:03 PM

Can anyone explain the principle of valve proving system . I am using DUNGS vdk 200 a so6 model.

SOS any1 ?

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Guru

Join Date: Jul 2010
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#6

Re: Looking for Gas Proving System Design

11/22/2013 6:20 PM

A gas meter prover is a device which verifies the accuracy of a gas meter.

A paper "Onsite Proving of Gas Flow Meters" provides an overview and cites references.

www.asgmt.com/default/papers/asgmt2009/docs/032.pdf‎

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Associate

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#7
In reply to #6

Re: Looking for Gas Proving System Design

11/22/2013 10:33 PM

We are not discussing a gas meter prover. The gas proving system has already been adequately described. It consists of a double block and bleed (sometimes called a vent). It's purpose is to ensure that when the gas fired boiler is not on, there is no leak into the combustion chamber that could cause an explosion when the burner is restarted. I have already detailed the codes that describe the procedure. Use the Australian one. It is more detailed than the American one. Dare I say that the Americans tend to put the procedure into a non SIL rated control system. The proving system should be the automatic procedure immediately before a boiler purge. Imagine the two main block valves in series with the vent valve between them. A pressure transmitter measures the pressure between the two block valve. No, we do not use a pressure switch on a good design. The procedure is. Close the vent valve. Check that the pressure does not increase between the block valves. If it does the first block valve is leaking. If there is no pressure increase briefly open the first block valve, then close it. Check that the pressure does not decay. That tests vent and second block valve Open vent valve. Test over. All valves must be ball valves.

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Allan Evans (2); diagon123 (1); Gasman (1); Iris (1); josej (1); Tornado (1)

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