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Hi EmmanuelTop and sshep It's quite suprising to me that API doesn't have commissioning standards, they even have standards on hydrotesting tanks (API 650). Thanks for the help! Gareth

Hi everyone I just wanted to find out if anyone knows if there is an API standard or similar for commissioning (particularly for a tank farm). Thanks! Gareth

I agree 100% with everyone else. You definitely require a PSV and should do a HAZOP. Even though you will never operate at 1375psi, you need to remember if there is a fire, the metal weakens and pressure increases. PSVs are very reliable (0.01 - 0.67 faults/year for a 1/1 system...

Hi everyone I have tried searching for an answer on the forums and google and can't find anything conclusive. I used to work for a company who said that every time that a PRV lifted, it had to be taken out and reset as the spring became unreliable (though this was never done in practice, this...

Vented....

Thanks for the article Snorgy. BigInch - Why's that? A 15m (50ft) length of 200NB pipe (8") is just less than 0.5m3. To me, if a line that size is liquid full, it'd be a serious problem, especially if it is one of the lines just after the outlet nozzle of the LPG sphere... Or am I missing...

I agree, an excessive amount of TRVs is the only thing I can think of. Thanks everyone, glad to see I'm not the only one that thought that it was necessary for small volumes too :) BigInch - you said it'd work for you, do you mean that you agree with the FEED (i.e. not required on smaller...

Hi Shunoff There are a lot of NFPAs, the ones that I've used on tank farms so far are: NFPA 11 - Standard for Low Expansion Foam NFPA 13 - Installation of Sprinkler systems NFPA 16 - Standard for the Installation of Foam-Water Sprinkler and Foam-Water Spray Systems NFPA RP 14G - Recommended...

Hi everyone I read the following in a FEED: "LPG - any section more than 500L of LPG that can be blocked in shall be provided with a TRV." Do you have any idea why there is a limit to the smallest volume that requires a TRV? I'd imagine a rupture in the line or flange or a failing gasket is...

It's gasoil & mogas... I am not sure if it was designed properly, though I know everything is EX except motors are IP56. Thanks for the help though! Will definitely have to see if they are even using work permits o.O Hopefully they are. But I know it's so remote that they don't have water to...

Thanks LittleInch. I figured it would probably have something to do with the electrical zone ratings, was hoping for a "20m from pumps" kind of an answer :) They didn't do zone classification for this plant - working in Africa is veeeery different....

Hi Welderturnedqc, and welcome If I can add to what the other guys said - the flange rating also has to do with the operating temperature - the higher the operating temperature, the lower the pressure rating. You might find this link useful, it has the pressure ratings for a few different...

I never said thanks for your feedback BigInch and LittleInch, so thanks :)

Hi all I have been asked to commission a tank and am concerned about future work on site. They will be continuing with hot work a little distance from the tank while the tank has been commissioned (though it will be a different system). I haven't been to this particular site yet so the distance...

Thanks so much BigInch - I thought there might be a bit of contamination allowed (since Jet A1 and Diesel have overlapping carbon chain lengths, I figured that only C16-C21 would be contaminants). Seems it is a lot more complicated than that! Thanks for the info! You seems to always have the...

Hi again! I am researching the possibility of multi-product pipelines, and need to know how much diesel (gasoil) or gasoline (mogas) is alllowed to contaminate Jet A-1. From what I've read, it seems the limiting factor may in fact be the water in the diesel and gasoline, rather than the...

25362 - Makes sense, I thought that when pressurised, the propane would condense pretty quickly (though I have no grounds to think this happens quickly - I guess this is just something I imagined and never questioned it) LittleInch - thanks :) Since there's no weigh bridge, we only measure the...

Hi LittleInch Thanks for your patience. I think I understand what you're saying - basically the gas is in transient state and in a sort of aerosol? How did you calc the 15bara, IGL? I think the answer from the drivers tomorrow will clear things up. I wish the guys had installed a vapour...

Would the lighter-than-LPG hydrocarbons be able to exert that much pressure? The way I see it, the vapour pressure exerted by a single component in a mixture is approx. the mol fraction * Pvap (Raoult's law) and even if there were lighter components, the molar frac should be small enough that it...

I can't - I was wondering about that today as well, maybe it hasn't reached equilibrium. We have 4 tankers coming back tomorrow and I should recognise a couple of the drivers so I'll ask them :)