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Hi, I need to know the latent heat of vapourisation for polyphosphoric acid at ~atmospheric pressure (56mbarg) for a fire relief calculation. Unfortunately, the MSDS's I have seen just says: 'not pertinent' as they do with phosphoric acid. Is there any reason for this? Does it break down to...

All pipe velocities now at sensible low single figures! Many thanks for all the help and advice.

Thanks for the replies. The 12m/s will 'only' be transferring about 20litres of fluid. It will also be via a system where the velocity can be reduced as well hence from a process design point of view it will not be an issue. The client will have to make their basis of safety for those transfer...

Brilliant. Well, that sorts it out then. Many thanks.

HM, Thanks for the reply. Even if a system is fully bonded and you are using a non-conducting solvent one still needs to keep the velocity low otherwise a charge will build up in the fluid itself. Based on the NFPA information, I am assuming acetone will not build a static charge and I will...

Well, finally a question that has not been asked on the site that I need answering so here's my first post! I am designing a small acetone storage tank (5m3 volume) which needs to be filled from a road tanker. I am having problems working out a maximum pumping velocity as some literature say...