Normal & Emergency Vent Query

[chemks2012]

Hello All,

I am reviewing venting requirement for flammable solvent tank [all atmospheric] farm site located in Europe.
I am tasked to look at normal and emergency venting requirement.
There are many horizontal spit tanks, each tank containing 3 compartment and each compartment containing different solvent in it.

My queries

1) I am planning to use API2000 or PSG8. Is there any specific standard for the horizontal spit tank?
2) For the relief case, I would consider the worst case solvent [i.e. one with lowest latent heat of evaporation] out of those 3 different solvent contained in the horizontal split tank. Is that correct?

Thanks in advance.
KS

 

[CMA010]

What is psg8?

 

[chemks2012]

CMA010

Guide to Pressure Relief (PSG8) : The Guide has been prepared by the AstraZeneca Pressure Relief User Group (AZPRUG) to be the basic AstraZeneca reference on the engineering of relief systems.

 

[Duwe6]

With three compartments and three different liquids, they are three separate tanks. But you'll find that the calc's for TANK venting already have fluid properties built in to them.

Each compartment will need a Conservation Vent with Flame Arrestor - I like ProtectoSeal 830 series. *And* each compartment will require emergency venting for Fire Case, which is MUCH more probable with them sharing walls [common bulkheads]. Simplest, easiest Emj Vent is one sitting in the manway to that compartment, like a ProtectoSeal 53000. Your emergency vent will probably calc out to 6 to 10" diameter minimum, so just put the manway to use.

 

[CMA010]

If you're doing a project for AstraZeneca you should use their standard as long as it is more stringent than applicable industry standards / design codes.

 

[Longinthetooth]

The full title was EPSHEG 8 - Comprehensive guide to pressure relief.

It was developed many years ago by the old I.C.I. and continuously updated until the dissolution of that entity. Zeneca was one of the daughter companies- Now AstraZeneca after joining with the Swedish company Astra. I dont know what happened after I.C.I. left the scene, but it looks as if AstraZeneca is still using it (and updating it).
I have a paper copy but it is at least 10 years old. Still a good reference though. I.C.I. didn't do anything by halves!

 

[chemks2012]

Duwe6
Thanks very much for your input. Agree that each compartment should be treated as a separate tank. In this case, I would select the worst solvent out of three and size breather valve and emergency manway so that cost effective common design is proposed (to minimise spares etc).

Thanks CMA010 and Loginthetooth