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balu1 This is a well known and established book on heat transfer, originally in German and translated in english. I dont know what VDI means in german. A search on google tells that its eqns are used in most of the design softwares on heat transfer. hope this helps

Does anyone have a copy of VDI heat atlas Please help

Dear Friesian Your question to calculate the vapour pressure of hydrocarbon gases is incorrect. Gases have no vapour pressure to the best of my knowledge. It is liquids that have vapour pressure which represents the equilibrium between the liquid and its vapor phase. This is readily calculated...

Dear Maurice Thermal expansion factor is used to account for the expansion for the orifice opening at the process temp. This is readily available in std texts. If you cant find i will send you a copy for the most common moc. For liquids the modified formula is 1/(b^4) = (0.6/sm + 0.06)^2...

dlewis As mentioned in the above posts, heat transfer will definately increse with the no of spirals as the area increases. However the eqns to use are not straightforward of the type q = UA LMTD as the LMTD changes as the vessel temp decreases. The approach to calculate the heat transferred...

Dear MaurisChe This was my first post and I am glad you found it useful. However the formula is applicable only upto pipe size of 2 inch. This formula is actually used for sizing intergral orifice plate assembly to measure flowrate of gas using a dp transmitter. The formula is apllicable to...

are these half coil limpets on the outer shell

I am using the following formulae for orifice sizing to measure gas flows . b = d/D ; d is orifice dia mm, D is pipe ID mm use b to get sm 1/(b^4) = (0.6/sm)^2 + 1 after getting sm , use the following eqn to get dp sm = Q / ( 0.1264 x D^2 x sqrt dp x sqrt de x sqrt z x f ) Q =...