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Another Q: Rupture disc burst pressure: A rupture disc is installed parallel to a relief valve, relieving pressure of the relief valve has been given: 25Barg. Then what should the burst pressure of the rupture disc be? Should I use a reverse acting rupture disc in this case? Thanks Cutie...

very helpful! Thanks everyone. Cutie Thank you, EngTips

Hello, My understanding is: ’U’ stamping for approved pressure vessels. ‘UV’ stamping for relief valves designed in accordance with ASME VIII code. Am I wrong? Lately I have been asked to purchase relief valves with ‘U’ stamp by my colleagues. Is it possible? One more question: If clients...

and my request for buying API standards has been rejected, because "we don't know how often we are going to use them, too expensive, don't want to waste money" Cutie Thank you, EngTips

Thanks, a friend once recommended that book, I think I have a copy. I don’t know if thermal is the worst case, but my boss is getting annoyed with me for questioning the client spec, because our client is one of the biggest oil company in the world, he thinks they know what they are doing, so...

calculation* Cutie Thank you, EngTips

Thanks, when I told a vendor I wanted a ‘thermal’ instead, he said ‘D’ orifice would be sufficient. I did the orifice sizing calculation (using equation in Crosby pressure relief valve handbook), I know the SG, set pressure, and the back pressure is 0, it looks like all I need to know is flow...

Hi pleckner, I think you are totally right. Thank you for your very helpful reply. That’s how others normally did it: - Give process details and all relevant relief valve specifications (from clients) to valve vendors - Vendors size the valves and send back sizing report with...

Thank you Jon, I will ask on Monday. Cutie Thank you, EngTips

Hey, I work for an engineering company (O&G), I’m new here, they used to have subcontractors to do the sizing and purchasing of relief valve, now it’s part of my job, I think that’s why we haven’t got the relevant API standards. I think all I need is to size a relief valve. I know the...

Oh, I forgot to mention, we don’t have the API521 standard in our company... but I have a copy of the Crosby pressure relief valve handbook, there are some formulas, I think they can be used to do the calculation. Cutie Thank you, EngTips

Thank you, Ben Hi Jon, This is my first time. I’m going on a training course next year. But at the moment, I’m really confused, “calculate the relief load” & “determine how big (i.e. the area in in^2)” - how do I do that? I always thought the vendors had to do the sizing… I have given the...

Thank you, pleckner, enjoy your day too. “increase in the confined space is the fact that the vessel is 100% liquid full and liquid, not being very compressible, has no where to expand” – so this is the blocked discharge scenario? (When outlet valve fails I imagine) The fluid is oily water; I...

Thanks JW, The operating temperature is ambient temperature for this project (-10/45DegreeC). I remember seeing the relief valve sizing software (I don’t have one), the sizing basis has to be filled in- fire or black discharge or thermal, etc, I guess if thermal is selected, it will just...

Because of the flow rate and everything, the normal relief valve is sized to have ‘G’ orifice, and a thermal relief valve as you mentioned ‘smaller than the typical API D orifice’. I’m not the process engineer, I’m not sure if there will be an overpressure (not due to thermal effects) scenario...

Hi, I have attached a drawing to help me explain. Filter vessel - MAWP is 20Barg, I have a normal relief valve sized for when the pressure goes above the MAWP pressure, but my client wants a thermal relief valve. I’m a little confused, does that mean the pressure inside the vessel would never...

Thank you very much BigInch, it’s very helpful. Cutie Thank you, EngTips

Hi, I’m new to pump field, so please help me. I attached a drawing just in case I can’t explain myself clear enough. Anyway, I read that ‘A relief valve is only needed if no other measures are provided to detect low flow conditions and shut down the centrifugal pump to prevent damage’, well in...

Thanks, my manager decided to send me on the BVAA course Cutie Thank you, EngTips

Thanks for the replies!!! The debates are interesting! I certainly learned a lot from all of you. Had intranet in my last company, but it’s pretty useless. Don’t have intranet in the new company. I needed API standards; I have got everything I needed. :) The IHS website looks good, but I doubt...