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Dear All, I have a vessel operating at atmospheric pressure and the fluid is Ethanol. The operating temperature of this vessel will be about 90 deg C and ethanol boils at 78.4 deg C at atm. pressure. THis tank will be drained out to another tank quickly as soon it is filled up. To minimise the...

Dear All, Need your help in selection of a Steam Trap.. I got a exchanger which is operated on a temperature control, the condendate load is about 2600 lb/hr The operating pressure is 60 psig and the condensate is drained to atmosphere. The vendor quoted me a 1.5" flat type trap with a...

Dear All, Need your help.. I've a got situation where I need to condense and cool a vapour stream from 260 deg C to about 200 deg C using natural convection or by leaving it bare. I need to know the amount of uninsulated length needed to do that. The process line is a 1/2" tubing. Thanks in...

Dear Experts, I'm doing a pilot plant study where I have a stripper which uses live steam to strip off acid gas to recover rich MEA solution. The MEA flow-rate is about 0.5 gpm and it contains H2S and C02. The exact composition of the acid gas is unknown at this point. I'm looking for a...

Dear Experts, I've got a column with bottom part made from Incoloy 800 H and top section from Chrome Moly. It is possible to weld these two materials directly, if not, then I might have to go with a full body flange (40") for the transition. Thanks in advance for your help. Timewrap.

Hi All, Here is a little problem on which I need your help. This is a batch process. A tank intially start with a temperature of -90 deg C and had to be heated up to -80 deg C in two hours. I'm considering a heat transfer fluid circulating through the vessel jacket at about 35 deg C, the...

Dear Experts, I'm designing a system where a reactor is cooled using liquid nitrogen inside a jacket around the reactor. The boilig point of liquid N2 at atmospheric pressure is about -196 deg C. I'm sure that the SS 304/316 could not be used at this low temp. I'm certain, it gotta be low some...

Dear Experts, This question had been on my mind for a while, I require clafications in terms of the requiremnts of the PRL (pump recicrculation line)for a centrifugal pump. The basics I understand are 1) A small centrifugal pump can be deadheaded without any considerable damage 2) A big...

Dear Experts, I want your comments on the flare header design, If I knew the total flare load and the all the information about installed PSV's. Can I assume that total allowable backpressure in the header from the PSV outlet flange to the flare tip should not not be more the 10 % of the set...

Dear Experts, I'm designing a system consists of at least 15 PSV's where most of them designed for fire case. All the PSV's are conventional spring loaded types, the flare header is purged with nitrogen with a contant pressure of 0.1 psig. How to calculate constant backpressure, variable...

Hi All, I'm trying to devise a Level measurement scheme in a Polyethylene reactor (Slurry Phase), this is in a pilot scale. I've used Nuclear in past and it works. This time, my customer is insisting on a using a level measurement using differential pressure. The technique requires a flush...

Hi All, Can somebody explain me the defination of the various category listed in ASME 31.3 such as Category D,M and Normal. I've got a pressure vessel with internal I.D less than 6", Normal operating pressue is 1400 deg F and presure is 30 psig. The design conditions are 1500 deg F and 50...

Hi All, I've got some values for the heat of reaction for Polyethylene which are in the range of 3400 - 4300 KJ/KG of Polythylene. Can somebody knowledgable in this field confirm this values OR point me in the correct direction for finding out more. Thanks in advance, Timewrap.