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No one has yet commented upon the statements from Campbell and Perry handbooks (recognized bibles for process engineers) Campbell in chapter "basic thermodynamic concepts" writes that work is zero unless some mechanisms is provided for its transfer; pumps, compressors, turbines and expanders...

Thanks Compositepro, but I do not think the explanation of J-T in Wikipedia is clearcut and easy to understand, do you ?

Latexman! I wrote "I presume this is valid also for an orifice". i.e. isenthalpic. It is in the VESSEL to be blown down the process may be said to be close to isentropic. Over the valve/orifice it is isenthalpic ΔH = 0, but look here: In Perry Handbook chapter 6-22 "Fluid and particle dynamics"...

My understanding increases hopefully Chicopee [smile], I have now read several other explanations in forums elsewhere and none describe it as work Morten A. Virtually all, describes it as an isentropic process in vessel- and over the valve as an isenthalpic process, as you said. Isenthalpic...

thread124-102901 thread798-136301 thread124-202829 thread798-242307 Hi, could someone in a very simple way explain why: the process upstream the orifice influencing the vessel is so-called "isentropic" and downstream the orifice (flare tailpipe, headers) the process is "isenthalpic", is...

thread391-38740 I imagine the required input is amongst others; Cp, thermal conductivity and density of the fire insulation. Has somebody run a case and applied the required input papameters and gained some learning to share?

could someone pass over such a example spreadsheet, it would be great

thread798-112950 Could someone please drop me an example excel spreadsheet on how to calculate settle-out pressure in a compressor section

Thanks Gunnar! If you come over similar sites please let me know regards runsaep from Norway - like you?

very useful web-site about pumps. NPSH-formula is quite simple, it can be calculated "stand-alone". But dP pipe inlet and outlet has to be calc. separately. In the offshore engineering business e.g Crane calculation spreadsheet can be used for that part. What I sought for was a spreadsheet...

want a more specific recommendation

what is the best pump calculation web site or spreadsheet you ever have come over? Please send it! It has to contain the possibility of pressure drop calculation for inlet and outlet piping