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Blanket Gas Demand/requirements?


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#1 justinbasha

justinbasha

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Posted 05 August 2016 - 12:43 AM

Hi there:

I am currently sizing a blanket (fuel gas) gas line from a plant header system to a small 400 bbl tank.  During the initial sizing, it was determined by the plant project division to add two additional tanks for the system and blanket these as well from the same plant fuel gas header.   As a result, I will need to upsize my blanket gas line to meet the demand of the additional two tanks as they will sit in the plant side by side.  I am using Unisim to size the line (and have the required flow rates of gas required) but had a few questions to ensure the design is safe and supplies the demand required.

 

1.  How would I determine that the plant header system can meet the demand of an additional three tanks?  I was hoping someone could provide me with some things to look at to determine the flow rate in the line to provide re assurance that the header can supply the additional demand?

 

2.  Is there some rules of thumb that I should consider?  If so could you elaborate or point me in the direction to find them?   (i.e. pressure at regulator no less than 350 kpag or gas velocity should be no greater than...)?

 

Thank you in advance.  Any help would be greatly appreicated.

 

 

 



#2 proinwv

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Posted 05 August 2016 - 08:29 AM

I recommend that you look at "Flow of Fluids", Crane TP-410. This will answer most questions that you have regarding flows. It is inexpensive and has been a respected reference for many years.



#3 justinbasha

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Posted 05 August 2016 - 08:33 AM

Thank you.  I believe a friend has this document.  I will take a look at it doe sure.



#4 justinbasha

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Posted 05 August 2016 - 09:08 AM

Hi ProinWV:

do you have any pointers on what i should be searching for (i.e. valve down stream restriction etc) to determine if the available gas can supply the three tanks?

 

thanks 



#5 ADITYA.DUBEY

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Posted 05 August 2016 - 01:09 PM

Dear Justin

We have 2" fuel gas header line each for 10000 bbls crude oil tank.
Supply pressure is 5 bar and 30 deg C.
Tank pressure is maintained around 4-5 kpag by means of Pressure regulating valve installed in blanketing line.

blanketing gas demand mainly depends on outlet rate (empty out rate)of tank which in our case is 10000 bbl per day.

I hope this practical example will be helpful for reassurance of your calculations.

You can also consider connecting your all three tanks together by a vapour balancing line which will be helpful in maintaining equal pressures in all tanks and also reduce blanketing gas demand.

Regards
Aditya




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