9 replies to this topic

[Graduate process ENG]

I am looking for density gal/Ibmole at 14.696 psia , 60 F for gas mixtures from  C1 up to C7+ .Anyone can guild me where I can find it? I would like to calculate liquid volume for gas mixture.

 

 

 

Appreciate your helps.

 

 

 

 

[ankur2061]

Gas Densities in USC units are defined as lb/ft3. To calciulate the densities, you need to know the molecular weight of the gas mixture. Refer the link below on how to calculate gas densities at either standard conditions of 14.696 psia / 60°F or at any other conditions of pressure and temperature:

 

http://www.cheresour...ard-conditions/

 

Regards,

Ankur.

[Graduate process ENG]

Thanks you very much this really helpful .

[Art Montemayor]

You write that you want to calculate the liquid volume of a gas mixture ranging from methane to heptane.

 

The only way that I know how to do that is to employ an equation of state (Peng-Robinson, for example), a simulation program, and a dewpoint calculation.  This is a phase equilibria type of calculation where you know:

1) the molecular weight of each of the gas components;

2) the mole composition of the gas mixture.

 

What you don't know is:

a) at what pressure and temperature does the mixture liquefy (dewpoint) - if it does;

b) what is the density of the resulting liquid product at the saturated liquid conditions.

 

You tell us that you want the liquid density at 14.696 psia & 60 oF but it is probably not possible to have a liquid product (presumably at saturated condtions) at those condtions.  --But then you don't tell us what you need the information for or what you intend to do with it.

[Bobby Strain]

There is something called GPM, (gal. NGL per thousand std. cubic feet of gas), in the natural gas processing business. Check how this is defined; maybe this is what you are looking for.

 

Bobby

[Graduate process ENG]

Art/Bobby , first ,  thanks you for respond ,appreciate your help and support . 

 

Why I am asking about density because I have seen post here in our forum about NGL yield calculation excel sheet which was mention density in gal/Ibmole and I was reviewed GPSA book  where they did mentioned density in Kg/m3. However , this confused me from where this density come from? dose this was given as standard at that pressure and temperature or there is calculation behind it .However, if it given as standard how I can obtained actual density for each respective component at different pressure and temperature. Also how I can converted from kg/m3 to gal/Ibmol in order to get estimated  NGL recovery .

[Bobby Strain]

Look for the definition of GPM with Google and you will find the answer. Here is one.

http://www.composis....nt/free/mol.htm

 

Bobby

Edited by Bobby Strain, 08 May 2014 - 05:29 PM.

[Graduate process ENG]

Bobby, thanks you for a very useful link ,however, they did not specify from where gall/Ibmole coming from?or how they did calculate ?

[Art Montemayor]

Graduate:

 

Bobby was perfectly correct in his response and assumptions.

 

I specifically stopped from going any further in probing just exactly what it is that you need or require because I expected you to respond to my comment: "...you don't tell us what you need the information for or what you intend to do with it."  I want to make a point here before giving you the precise information I think you require:  as a young graduate you would be well advised to communicate your needs and requests in a direct, specific, and detailed manner.  Otherwise, experts (like Bobby) are left to guess, speculate, or ponder just exactly what it is that you are talking about.  And this wastes a lot of our member's valuable time and efforts.

 

Now to get to your need.  I believe now that you require knowledge about the GPSA and the excellent Engineering Databook that they publish.  If you are interested in following up on this recommendation, ask us about it.  For now, read the excerpt I have taken from said Databook and that should satisfy your request.  I hope this helps you out - but you need to work on your communicating skills.

Attached Files

•  GPSA on NGL Contents.docx   430.76KB   19 downloads

[Graduate process ENG]

Art, agree with all of your comments and a great information coming from great people like you and Boppy.
We are leaning from you and others not only engineering knowledge but also commuinication skils.
Thanks once again.