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I suggest API608.

There should be common forum from manufacturer engineering, but it's little difference based on diff design and different factor added, so you would better confirm to your suppler.

Thanks valvit and littleInch, very appreciated for your guys input. This is awesome. The ball valves we use for oil service,which don't have pressure communication hole, because we request to verify the upper seal through body drain, pressure must be relieved back to upstream, directly connect...

Dear Senior, I have a question regarding to DIB-1 ball valve external pressure relief device, due to thermal pressure expansion we have to install external pressure relief device for DPE ball valve in liquid service. The code of ASME B 31.3 section 322.6 which defines that the pressure relief...

Hello, I am wondering anyone has experiences to use TOV (Triple offset valve)on terminal isolation. How the performance of the TOVs? any leaking issues is found through stem or disk. Thanks

Congratulations LittleInch on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go! That is awesome! Hi LitteInch, You estimated 30C temp increasing could expand pressure from 1000psig to 1440 psig. why my culcalation is around 5C. The...

Thanks Gerhardl, How about on liquid service? Is it same like gas phase? Thanks.

Hi guys, Does someone know how to calculate body cavity thermal expansion pressure? For example, 30inch ball valve, full port, #600class, how much degree increasing of temperture could cause pressure expansion from 1000psig to 1440 psig. Very appreciate.

Thanks. blinv, I means where I can find definition of the code which specific that should apply with 1ENP or 3ENP for higher operating temperature, typically my understanding is 3ENP gives trims pretection more than 1ENP. Thanks.

Hi, Who is the expert aware with what's the different between 1Enp and 3ENP on trim, the pipeline operational TEAM and pressure rate will be 149C and ANSI 600. Thanks

Hi all, Does somebody has such experiences which is requested SPExSPE seats? Thanks.

Stiaf, Would you please advise how did you use cavity drainvalve to shock the valve? Thanks.

I agree with Gerhardl, for isolation(no DBB requirement), throttling and sacrificial purpose, maybe TOV is good choice.

You guys both gave exhaustive description, thanks. The valves must be buried, I could not imaging any possible reason of potential cavity overpressure, otherwise must be applied with DPExSPE.

Thanks guys, very appreciated. The valve will be used to isolate pump station deal with Emergency shout down and maintenance, 36inch. I plan to apply a SPE type(DIB-2)for this purpose, it is DPE X SPE. I am nervous to apply DPE x DPE C/W external pressure relieving valve for buried. But the...

Thanks,Pennpiper. I have a few years pipeline design experiences, the valve will be used to transport crude oil in Alberta, be buried due to low TEMP. Operating Pressure and Temperture is 1200PSI/45C. Thanks.

Hi all, I'm looking for some instruction or idea regarding body cavity pressure relieving in ball valve. what kind condition is requested body pressure relieving? If the valve is buried, be below ground, whether it is necessary to apply relieving body cavity pressure in liquid service? Thanks.