3 replies to this topic

[Afshin445]

Dear All,

During of simulation of a gas pipeline a basic question rise for me.
When we using hysys for simulation of pipeline normally we define gas molar flow based on MMSCFD.
But at the end of pipeline when gas become two phase hysys give us liquid molar flowrate based on MMSCFD.
My question is can we use MMSCFD for liquid flowrate also?
If the answer is yes what's meaning of this?

Rgrds
Afshin

[breizh]

Hi ,
Take a look at this link :

http://en.wikipedia....ic_feet_per_day

Hope this helps
Breizh

[Afshin445]

Breizh,

Thank you for your fast reply and information. In defining MMSCFD, the referenced site refers us to gas and also liquid; but for SCFD only, it refers us to gas flow. It confuses me.

For gas, it's understandable because when we fix Pressure & Temperature and, as a result, molar flow has a constant relation with volumetric flow (PV=nRT). But I can't understand this relation for liquid in standard condition.

I would appriciate it if you could advise me in this regards.

Rgrds
Afshin

Edited by Art Montemayor, 22 January 2011 - 11:21 AM.

[Craig Morris]

A standard cubic foot can be thought of as representing the amount of material that would occupy a cubic foot, if it were an ideal gas at 60 F and 1 atm. It doesn't matter what conditions the material is actually at. As such, it is in fact a molar unit - not a volume unit, as far as the simulator is concerned.

Craig