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# Aspen Hysys Calculation Of Standard Liquid Voumetric Flow Rate For Ngl

3 replies to this topic
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### #1 Vegeta

Vegeta

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Posted 12 April 2020 - 04:06 AM

Team,

I am simulating a propane stream in the NGL plant and I have the following question:

How does Aspen HYSYS calculate the standard liquid volumetric rate of the low boiling point liquids i.e. at what temperature and pressure?

I have been using Aspen HYSYS for more than 3 years and I'm used to reference the standard liquid volume to 60 °F and atmospheric pressure.  However, this has been my first time to deal with low boiling point liquids. The liquid propane boils at -44 °F at an atmospheric pressure.  So, it shall be vapor at 60 °F.  The HYSYS results are not inline with this as follows (as an example):

Mass flow rate = 102175 lb/h

Density at -44 °F (and 30 psig) = 36.4 lb/ft3

Actual volumetric rate at -44 °F (and 30 psig) = 2807 ft3/h

the standard volumetric rate of the same stream by HYSYS = 3211 ft3/h

This corresponds to a density = ~31.8 lb/ft

However, there is no way the stream is liquid at 60 °F and atmospheric pressure.  Am I missing something here?

Regards,

### #2 Bobby Strain

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Posted 12 April 2020 - 09:25 AM

You need to find the definition for standard liquid volume. It's not the same condition as gas volume at STP.

Bobby

### #3 breizh

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Posted 12 April 2020 - 09:30 PM

http://users.rowan.e...ty packages.pdf

Hi,

Consider this resource to support your work .

Good luck

Breizh

### #4 Vegeta

Vegeta

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Posted 13 April 2020 - 02:29 AM

Thanks Bobby and Breizh...

The answer is in the pages 55 to 59.

Regards,