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Hi, Im looking into water hammer at the moment. I am trying to figure out whether or not my lines are at risk from water hammer stresses. I have found a design guide which tells me that if t>3L/Vsound then water hammer is not a problem. t = valve closing time L = length of column of fluid...

Hi, I was recently doing some work where I wound up looking at gas densities at different pressures. It got me thinking about values for the universal gas constant, R. At this stage I have seen many different values and units, from 287.05 J/kgK (for air) to 0.08205746 L.atm/K.mol. My question...

Hi all, I recently posted a question about nitrogen purging calculations in this forum. Im glad to say that I have resolved my earlier question, but I now have something of a follow up!! On our plant, we are planning on generating nitrogen at 6-8BarG, distributing it at 3BarG and supplying it...

Guys, I wonder if any of you would have access to the archives of the journal "Industrial & Engineering Chemistry Research". I would be very interested in seeing a copy of an article from 1943, the reference is as follows: Watson, K.M. Ind. Eng. Chem., 35, 398 (1943) Thanks Niall

Joerd, thanks,thats really useful. Niall

Dick, I dont suppose you know what the critical pressure is as well? Thanks again Niall

Dick Thanks for that, the Tc value is really useful to have. Niall

All, thanks for the help. I have used the C-C eqn, and have gotten an answer which seems to have met with some general agreement. Your help is greatly appreciated. Cheers Niall

Thanks 25362, I had considered using that expression, but I was under the impression that it was just for phase change operations, or does the question of boiling point presuppose a phase change and as such this expression is valid to use here? Im sorry, my thermo is a little rusty!! Niall

Hi all, I have a question regarding the prediction of a boiling point of an oil at varying pressures. I have a natural/essential oil whose thermodynamic properties I know at 1atm. The properties I have are density, viscosity, specific heat capacity, latent heat of vapourisation and its vapour...

25362, Unfortunately, the tanks are being designed to withstand only a very small amount of over pressure, once the pressure gets above 1.03BarA there is a relief valve that goes. What I was wondering was if you knew of any fudge factor that I could use to allow for incomplete mixing etc? Cheers...

Hi, Im working on trying to figure out how much N2 is required to inert a vessel such that the final O2 conc. within the vessel is <= 2%. I have done some sums which indicate that ideally 3.5 tank volumes would be required to do this. The other engineers in my office generally agree that this...

Who isn't a "free market capitalist". The problem is that we do not in general work in a "free market". As long as there are unions, this debate will exist. I would not say that it should be requisate that an engineer should be a member of the above society, I think that it could be good if they...

All of the above sounds good to me. I think this is a topic that could be debated for a long time. I think every contributor to this thread has more or less agreed that engineers are under appreciated and under compensated (generally speaking) for our contribution to industry. I also think that...

I would 2nd (or 3rd) the sentiments of both ScottyUK (Electrical)& Ussuri (Civil/Environme. I am a member of the IEI and the IChemE and again, I feel I get very little other that journals and job adverts. I agree with what moltenmetal (Chemical) had to say. I wonder how difficult it would be...

can someone please explain to me what the 401k plan is?

My understanding of the way in which unionised labour works is that you get pay increases on the basis of time served in a position. I have seen situations in my country in which the annual salary of a technician/operator is in fact more than that of the plant manager as a result of the...

Ziggi I have to agree there

Agreed.

regarding conformity, it would be up to the relevant institutions to agree on standards, but I cant imagine that there would be a huge difference in standards between chartered and professional engineers on both sides of the atlantic. I would not suggest that engineering become a unionised...