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Hydrate Formation (Upstream Or Downstream Pressure)

pressure control downstream pressure hydrates

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#1 rs20170808@gmail.com

rs20170808@gmail.com

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Posted 04 July 2021 - 02:55 AM

i have a gas expanding thru a control valve ...

upstream pressure is 400 psig and downstream is 50 psig

 

upstream temp is 80 F and downstream is 50 F

 

At upstream pressure hysys show hydrate formatiion at 56 F

at downstram pressure hysys show hydrate formation at 35 F

 

What should be considered ...will hydrate form? since downstream temp. 50 F > 35 F so no formation?

 

which pressure should be considere for analysis?



#2 Pilesar

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Posted 04 July 2021 - 03:33 AM

Hydrate formation tendency is affected by pressure, temperature, and composition. Consider the stream composition at its conditions: upstream pressure at the upstream temperature and the downstream pressure at the downstream temperature.



#3 PaoloPemi

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Posted 04 July 2021 - 01:45 PM

given composition, hydrate formation temperature depends from pressure as said by Pilesar,

see the image below created with the free online calculator

https://www.prode.co...ies/hydrate.php

 

hydrateformation.jpg

 


Edited by PaoloPemi, 05 July 2021 - 01:08 AM.





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