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Thanks a ton, jwy! I also used that same approach, and came up with basically the same answer (47.9 lb/hr). The only difference was that I used .0911 lb/cu.ft. H2S Would it make a big difference if we adjusted for the MW and temp? The temp of the gas is actually 60 F and it's specific...

Hello, I just learned that the valve is a Varec 2"x3" model 2020B. After speaking with Tyco, I learned that the max pressure flow capacity for this valve is 8098 SCFH and the max vacuum flow capacity is 1562 SCFH. If some one could help me calculate the amount of H2S released, it would be...

Hello, I have learned that the PRV is a Varec model #2020B, 2"x3". After speaking with the manufacturer, I learned that this valve has a maximum pressure flow capacity of 8098 scfh and a max vacuum flow capacity of 1562 scfh. Given the gas composition and this flow information, would someone be...

As soon as I receive the model # of the valve, I will then be able to provide the flow curve. Hopefully, that will be soon. Thanks for the help.

Thanks guys for all of your help. I just contacted Varec to get the flow curve on the valve. Unfortunately, I do not know the model number and the guy I was speaking with was unable to venture a guess at which valve I was trying to describe. Maybe you guys can venture a guess. Here is what...

Hello guys, I have some additional information and hopefully this can help solve the problem. The gas components are approximately: Methane = 75-78% H2S = 6-13.5% (normally, 6.5-8%) Propane = 3-4% Butane = 2% CO2 = less than 1% I know it doesn't add up to 100%, but that's as close as I can...

I have just learned that the PSV was a 3" Varec valve. I do not tknow the size of the orifice. Would that help in determining the amount of gas/vapor that can release through it?

I have spent the last few days trying to gather information, specifically from the EPA. Do you know of the specific EPA regulation that address these types of calculations? Thank you.

Thank you very much for the reply and your assistance. First, the composition of the gas contains 6.5% total volume of H2S. I am trying to obtain the composition of the gas and the temperature; as soon as I get those, I will post them. Regarding the flow curve of the PRV, I don't know if this...

Hello Steve, thanks for your reply. I do not have any other information on the gas/liquid charateristics, but I do know that the air release coefficient of the PRV is 0.95. Using your engineering judgement, can you provide me with an approximate amount of the H2S release rate? Thank you very...

I am attempting to calculate the emission rate of H2S from an oil/gas production slop tank. The pressure relief valve that was venting to atmosphere released at 8 psi through a 3" pipe. The volume of the tank is 16,800 gallons and there was a continuous supply of gas flowing into the tank...

To Latexman: Vapor Thank you very much.

What is the typical/average air release coefficient of a PRV on an oil/gas production slop tank.

I have been given the task of calculating how many pounds of H2S was released through a pressure relief valve on a slop tank that was constantly fed a supply of gas for a 24 hr period. I wish I was a ChemE, but I'm not, so I would appreciate some help from someone who is. The slop tank holds...