how to calculate weight of gas

[Bao Nguyen]

Dear friend,

I have a trouble during using codeware to assume operating weight on heat exchanger design. My question is how to know the result calculate for weight of liquid is correct if the service of tube and shell side is gas service, not liquid? Based on codeware there have option to input liquid level and specific gravity but the formula is using for liquid or use the same with gas service?. In my calculation, i have input 0.6 SG for gas at shell side and tube side and shell I.D 975 mm with total length of shell is 11200 mm then the weight of liquid total shell side and tube side is 2,6 ton. Is it correct?

 

[ivymike]

i have input 0.6 SG for gas at shell side and tube side

0.6 SG sounds like a very high density for a gas. I suspect you want to put in a much lower number.

 

[katmar]

A liquid SG is the ratio of the liquid's density to that of water. A gas SG is the ratio of the gas' molecular weight to the MW of air. If the codeware is expecting a liquid SG you will have to convert your gas SG to being relative to water.

Katmar Software
Engineering & Risk Analysis Software

http://katmarsoftware.com

 

[racookpe1978]

"Generic" weight of a volume of gas around standard temperature and pressure (STP, or room temperature and atmospheric pressure for practical purposes) is about 1/1000 the weight of an equal volume of liquid.