[HWY36]

So the pressure relief valve on my recovery tank blew recently. When it blew, it never shut again. It spewed LPG for hours and let out 50 lbs of gas. It never shut off. The seller of this tank ensured me that this is what the tank is designed to do. I've seen other tanks briefly release some pressure before closing again; isn't this what they're designed to do? Doesn't it make more sense, wouldn't it be safer if the release valve let out the excess pressure then closed? The seller claimed that it was engineered to just keep venting. I don't understand.Isn't it more dangerous and harder to contain shitloads of gas spewing into the atmosphere? Is the seller full of shit? If not, how is this safer than a valve that automatically closes and then reopens at a predetermined PSI? Thx.

[dabboy]

That's really BS . When the pressure is exceed the set point of the pressure relief valve , the relief valve will automatically open it and let the over pressure out and then close if the pressure in the tank below the set point of the pressure relief valve . If the pressure relief valve won't close , all the gas will be gone ! That's crazy . Which brand you bought ?

[Gray Wolf]

Originally Posted by HWY36

So the pressure relief valve on my recovery tank blew recently. When it blew, it never shut again. It spewed LPG for hours and let out 50 lbs of gas. It never shut off. The seller of this tank ensured me that this is what the tank is designed to do. I've seen other tanks briefly release some pressure before closing again; isn't this what they're designed to do? Doesn't it make more sense, wouldn't it be safer if the release valve let out the excess pressure then closed? The seller claimed that it was engineered to just keep venting. I don't understand.Isn't it more dangerous and harder to contain shitloads of gas spewing into the atmosphere? Is the seller full of shit? If not, how is this safer than a valve that automatically closes and then reopens at a predetermined PSI? Thx.

All pressure relief valves are not created equal. Each valve has both a cracking pressure and a reset pressure, which are typically not the same. The cracking pressure is usually higher than the reset pressure, so if it releases at say 125 psi, it may not reset until 100 psi.

That said, there are also defective valves. What pressure did it release at and what pressure did it eventually reset at?

[HWY36]

Originally Posted by Gray Wolf

All pressure relief valves are not created equal. Each valve has both a cracking pressure and a reset pressure, which are typically not the same. The cracking pressure is usually higher than the reset pressure, so if it releases at say 125 psi, it may not reset until 100 psi.

That said, there are also defective valves. What pressure did it release at and what pressure did it eventually reset at?

It released at 150; it never reset; the tank emptied and the valve is still open. The seller claimed that it was engineered that way and said I would need to purchase a new pressure relief valve. I wanted to see if there is any way on earth that is possible before I jump to any conclusions.

If you can recommend a reputable pressure release valve, that is something I would happily pay extra for. Regards.

[FieldsOil]

What was the part in question, so I don't buy it

[Old Gold]

That's pretty shitty. Why would anyone sell such a device, knowing what task you are trying to accomplish?

Who is the seller?

Glad to have you alive and well. Cheers!

[Gray Wolf]

Originally Posted by HWY36

It released at 150; it never reset; the tank emptied and the valve is still open. The seller claimed that it was engineered that way and said I would need to purchase a new pressure relief valve. I wanted to see if there is any way on earth that is possible before I jump to any conclusions.

If you can recommend a reputable pressure release valve, that is something I would happily pay extra for. Regards.

I've used rupture discs only good for one failure, but never seen one time PRV tank valves.

What kind of tank and who did you buy it from?

We used Swagelok pressure relief valves, if you are looking for a reliable replacement.

[HWY36]

Originally Posted by Gray Wolf

I've used rupture discs only good for one failure, but never seen one time PRV tank valves.

What kind of tank and who did you buy it from?

We used Swagelok pressure relief valves, if you are looking for a reliable replacement.

I bought the tank from Open Source Steel, who, until now, I've been happy with. The guy's name was Dominick and he was a total dick. When I told him it didn't make sense for a PRV to keep spewing gas until it was empty, he insisted it was designed that way. He also told me I would need to purchase a new PRV and that he didn't want to argue about it. I want the world to know about this.

Thanks for the PRV suggestion

[HWY36]

Originally Posted by Old Gold

That's pretty shitty. Why would anyone sell such a device, knowing what task you are trying to accomplish?

Who is the seller?

Glad to have you alive and well. Cheers!

Thanks for the kind words. My balls have almost dropped back to their normal position; pretty scary shit. My pump went out and the tank had a lot of gas. The temp climbed quicker than I anticipated. Going to get a back up tank for the PRV to shoot the gas into for next time, god forbid. Any recommendations on where to get a tank other than Open Source Steel. Thx all.

[Gray Wolf]

Originally Posted by HWY36

Thanks for the kind words. My balls have almost dropped back to their normal position; pretty scary shit. My pump went out and the tank had a lot of gas. The temp climbed quicker than I anticipated. Going to get a back up tank for the PRV to shoot the gas into for next time, god forbid. Any recommendations on where to get a tank other than Open Source Steel. Thx all.

https://dsps.wi.gov/sb/docs/sb-CodeD...ppx85to106.pdf

Above is a link to ASME Section VIII, which outlines pressure relief requirements in UG 125 through 137.

Pressure Relief Devices/UG-125 General

(a) All pressure vessels within the Scope of this Division, irrespective of size or pressure, shall be provided with pressure relief devices in accordance with the requirements of UG-125 through UG- 137.

NFPA-58 definition of pressure relief devices and valves for LPG service.

https://www.nfpa.org/assets/files/ab.../58-98-pdf.pdf

Pressure Relief Devices:

A device designed to open to pre-vent a rise of internal fluid pressure in excess of a specifiedvalue due to emergency or abnormal conditions.

Pressure Relief Valve.

A type of pressure relief device designed to both open and close to maintain internal fluid pressure.


If you look at their ad, they are calling it a Pressure Relief Valve: https://www.opensourcesteel.com/prod...d-solvent-tank

If they are selling this for LPG service, they ostensibly should meet the requirements for that service.