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Pocket In Oil And Gas Lines

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    Junior Member

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Posted 20 July 2019 - 09:25 AM

Hi every body 

please i need your help please.

I would like to know how to decide that such line ( vapor, liquid or mixed)  must be layed without pocket.

Thanks in advance.

#2 Bobby Strain

Bobby Strain

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Posted 20 July 2019 - 10:04 AM

Those that require such. As an experienced engineer, you should be able to analyze the situations. We can't possibly cover all the instances for you. So, don't depend on us.





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Posted 20 July 2019 - 11:09 AM

Many thanks Bobby for your reply.


Can you please give me some examples for those that require ?


Thanks in advance. 



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Posted 20 July 2019 - 11:31 AM

another question Bobby


Which parameter should i take in consideration while analyzing each situation


Many thanks.

#5 PhilippM


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Posted 20 July 2019 - 01:16 PM

What type of line are you talking about?


As Bobby Strain already pointed out, we can't cover all possibilities. There isn't a general rule of thumb or something like that to cover all situations in all industry sectors, as there are many different parameters to consider like: Which fluid is transported in it, process conditions, length, diameter, material, requirements for drainage, requirements for cleaning etc



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Posted 21 July 2019 - 01:18 AM

Thanks PhilippM 


In my case the fluid is a gas ( 78% C1 , 13% C2 , 3% C3 ) @ P= 50 Barg , T = 42 °,  the line diameter is 3 inches with about 450 m of length.


the gas to be used as backup fuel gas and is routed from slugcatcher to backup fuel gas K.o drum.

#7 gegio1960


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Posted 22 July 2019 - 01:57 AM

my 2 cents...

pockets in lines create spaces for liquid accumulation and possible flow of liquid slugs.

for your service, fuel gas, you have to absolutely avoid this situation: liquid droplets shall never be present at burners to avoid over pressurizations in the combustion space.

your last protection is the KO drum and the no-pocket provision for the KOD inlet line helps this item to meet its scope.

preferably, the line slope should be towards the upstream slug catcher.

the presence of liquids in the line could be generated, mainly, by off-design operations of the slug catcher (ie different flows, compositions, conditions).

of course, also the line from KOD to burners shall be no-pockets, with slope towards the KOD. it shall be as short as possible (few meters).

hope this helps,

good luck!

Edited by gegio1960, 22 July 2019 - 02:02 AM.



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Posted 22 July 2019 - 03:00 AM

many thanks gegio1960

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