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Thanks Latexman.

Hello! I have some questions regarding the requirements on lifting levers for relief valves as it applies to a project I am working on. The relief device in question features a packed lifting lever. The devices intent is to protect a positive displacement pump and its piping...

We are using the requirements of API 520 and 521. It has been very interesting work. It is still ongoing with a group of people at different countries. The final product will be interesting for sure, but I will not be able to see it since the company I work for was bought and we were separated...

Hello, If possible, can you help me develop a list of topics to include on a best practice document for relief devices? From design, material selection, installation, maintenance... Thank you,

We were having a discussion here at work regarding the need of a bypass around a PCV. I have a 3" steam line with a PCV in between but a 6" bypass around it. Picture is attached. This is an old system, installed sometime in the 70s'. The relief valve downstream of this system, was sized based on...

The pipe spec was just recently updated to include threaded smaller pipes, it was going through approval process. I was working off an old pipe spec and was wondering if there were any specific rules. Thanks for your input.

This will be a 1"X1.5" relief valve on a 0.5" nitrogen line. Our piping spec allows thredded piping for 1.5" diameter pipe or smaller.

I need to install a PSV in Nitrogen line. A different model relief valve was received (27EA34-120 is flanged) instead of 27EA34-M20, which is threaded. Would it be okay to install a flanged PSV in nitrogen service?

I want to thank everybody for your comments. I have since looked at articles in this database and taken various notes based on your feedback. Many thanks!

The company where I work has several relief valves identified as having inlet line losses greater than 3%. - What kind of engineering analysis can be done to show that the installation will not chatter? - What guidelines can be used to ensure the installations will not chatter? Thank You!

JAlton, manu thanks for your comments and recommendation. Much appreciated.

Thank you all for the help and clarification.

Is it a code violation to have water service valve with a SCFM stamped nameplate?

Thanks Mett11 and EmmanuelTop for your help. The valve will most likely react differently on air and on water. So they are not interchangeable between the services because they will react differently on each service and the ASME nameplate will reflect the set and service the valve is being...

Hello, I received a request to verify if a Farris valve (27DA23-M20), which is currently used in water service can be used in nitrogen service. Would this be possible? Thank you

I have a relief valve in nitrogen service (line provides a N2 pad to a tank). what is the difference between a Packed Lever and a Open Lever relief valve? Would that make any difference in my service? Thanks in advance!

Avalveman, thanks for your feedback. How do I ensure the valve is actually certified? Will the relief valve tag identify certified/non certified? Or is there another designation for that? Thanks!

avalveman, thank you for your reply. we have several tanks above 15 psig, so it would apply to all of them. When you say "capacities certified against these code rules by the National Board of Pressure and Vessel Inspectors" do you meen the relief calculation that we engineers do on each valve...

Are relief valves and rupture disks required to be certified / stamped when in hazardous processes? What can be done to have them certified?

we have two different relief valve models with the same SAP Number. The difference between the two is that the F2740UL-OL is basically obsolete and the predecessor of the Farris Model 27CA23120. The F2740 series is .06 in^2 orifice while the 2700 series is a .068 in^2. All other settings are...