Need Information for CO2 Purging in an Oil Tank
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  1. #1

    Need Information for CO2 Purging in an Oil Tank

    Hi Guys Need a Lot of info regarding CO2 purging in oil tanks

    So here is the matter we have 6 Big Oil tanks and there has been a continuous supply of CO2 to these 6 tanks but the problem is that the consumption of CO2 is more in these tanks as there is a man hole above the tank which releases any pressure or Oxygen and other gases in to the atmosphere.

    I need a proper system which can help me for CO2 usage reduction

    And also Oil level of the tank is not same even we need an automation for this like suppose the oil level of the tank is 3/4 and the co2 is already full in tank and suddenly if oil level dips and the co2 content reduces then there will be pressure inside and same case vice versa if oil level rises that too.
    So need a system which manages all these things.

    Any help would be great

    Thanks

  2. #2
    Join Date
    Mar 2012
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    782

    Re: Need Information for CO2 Purging in an Oil Tank

    How big of tanks are you talking about?

    I know it sounds completely silly, but latex weather balloons aren't very expensive. If you could fit a 20' diameter weather balloon to the opening, and maintain it about halfway inflated (a fraction of a psi), it would act as an accumulator of sorts. Enough volume to quickly make up for a drop in the oil level, and enough give to take up the volume from a rise in the level.

    It'd sure be a lot cheaper and simpler than some sort of computerized rig with sniffers and solenoid valves and alarms...
    You didn't build that.

    '85 Miller AEAD-200LE

  3. #3

    Re: Need Information for CO2 Purging in an Oil Tank

    Tanks height is about 8 to 9 meters

  4. #4
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    Re: Need Information for CO2 Purging in an Oil Tank

    Your going to need an accumulator tank. I am an not an expert at tanking and fuel handling, so please take my advice with a grain of salt. I am thinking a voided tank to capture the displaced CO2 would help with your losses. You would need a pressure relief and CO2 resupply, but I think that would be a simple thing to figure out. I would consult with a professional engineering firm that specializes in this stuff; to much **** to go wrong and liabilities.

    https://en.wikipedia.org/wiki/Hydraulic_accumulator
    Last edited by Billdacat; 06-03-2017 at 10:28 AM.

  5. #5
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    Re: Need Information for CO2 Purging in an Oil Tank

    If you can use compressed air you could set control switch to max ,minimum with pressure relief valve slightly higher.
    When using oil compressor will keep pressure up . When adding oil , pressure relief will maintain pressure.

  6. #6
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    Re: Need Information for CO2 Purging in an Oil Tank

    Quote Originally Posted by redlikesu View Post
    Tanks height is about 8 to 9 meters
    And what is the volume of the tank ?

    What kind of oil are you storing in those tanks ?
    Crude oil, lubricant, heating oil, olive oil ?

    What is the CO2 for, I presume gas blanketing, to prevent an explosive air/gas ratio ?
    https://en.wikipedia.org/wiki/Tank_blanketing

    http://petrowiki.org/Fixed_roof_tanks
    http://petrowiki.org/Tank_breathing

    Presentation: Tank Blanketing 101
    http://www.lesman.com/train/webinars...keting-101.pdf

    Why do you use CO2 ? Is there a reason for that ?
    Maybe you could use Nitrogen N2, generated (made) on site with a nitrogen generator.
    Last edited by bluemoon; 06-05-2017 at 02:47 AM.

  7. #7

    Re: Need Information for CO2 Purging in an Oil Tank

    Quote Originally Posted by bluemoon View Post
    And what is the volume of the tank ?

    What kind of oil are you storing in those tanks ?
    Crude oil, lubricant, heating oil, olive oil ?

    What is the CO2 for, I presume gas blanketing, to prevent an explosive air/gas ratio ?
    https://en.wikipedia.org/wiki/Tank_blanketing

    http://petrowiki.org/Fixed_roof_tanks
    http://petrowiki.org/Tank_breathing

    Presentation: Tank Blanketing 101
    http://www.lesman.com/train/webinars...keting-101.pdf

    Why do you use CO2 ? Is there a reason for that ?
    Maybe you could use Nitrogen N2, generated (made) on site with a nitrogen generator.
    So here it is the content of the tank is Diesel and Some Petroleum tanks

    Volume of the tank Not sure about it

    But these tanks are mostly open(Flange size 8 inchs) so right now there is continuous CO2 supply

    So in case if oxygen content is more then there will be problem as from open flange it is under atmospheric condition

    So the closed tank blanketing doesnt work as tank is open

    So any other suggesions on this like any oxygen analyzer to be installed and the sensor inside tank in case oxygen content more than peermitted level CO2 pump opens and supply co2 or like this is there any system by which this can be done

    Request for help

  8. #8
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    Re: Need Information for CO2 Purging in an Oil Tank

    Where are you located ? somewhere in the US ?
    I am pretty sure there is some regulation and legislation regarding storage tanks.

    I don`t live in the US, so I can`t comment on that.
    Maybe this API standard ?
    API STANDARD 2000 SEVENTH EDITION, Venting Atmospheric andLow-pressure Storage Tanks
    http://ballots.api.org/cre/scprs/bal...tionballot.pdf

  9. #9
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    Re: Need Information for CO2 Purging in an Oil Tank

    It sounds like you need a PV/RV valve on the tank. This allows the tank to vent at a few inches of pressure when filling and also allows inlet venting when you draw out of the tank. The CO2 would be the makeup.
    I also suggest you contact a vent vendor who can properly size a vent for your application. I used this company for an acquis ammonia tank I recently put in service.

    http://www.ipegstl.com/

    Dan D.
    Manipulator Of Metal

  10. #10
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    Re: Need Information for CO2 Purging in an Oil Tank

    I agree, designing/sizing a blanketing and vent/relief system is not rocketscience, but it needs to be done with care.
    Major accidents can happen with tanks.....

  11. #11

    Re: Need Information for CO2 Purging in an Oil Tank

    Quote Originally Posted by bluemoon View Post
    Where are you located ? somewhere in the US ?
    I am pretty sure there is some regulation and legislation regarding storage tanks.

    I don`t live in the US, so I can`t comment on that.
    Maybe this API standard ?
    http://ballots.api.org/cre/scprs/bal...tionballot.pdf
    We are located outside US,Plant is in Dammam Saudi Arabia

  12. #12
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    Re: Need Information for CO2 Purging in an Oil Tank

    Dammam is right in the middle of the oil fields in Saudi Arabia, over a million people live there.
    I am pretty sure there are plenty of consultancy and engineering company`s that can help you.

    It`s not that I don`t want to help you, but you have to be careful with storagetanks and their vent/relief systems.
    I can tell you the setup and design on the plant were I work, but that might not be comparable with your situation.

  13. #13

    Re: Need Information for CO2 Purging in an Oil Tank

    Well lets see i just came up with a solution to connect an oxygen analyzer that senses the content of o2 in tank.setting up with the upper flammable limit and lower flammable limit does the work as it supplies co2 with this limit.these analyzer connected to a control valve which will regulate the supply of co2 in tanks.Hope this is the one solution that works...still in research.

  14. #14
    Join Date
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    Re: Need Information for CO2 Purging in an Oil Tank

    Sounds like big tanks, you need professional advice on this one.

  15. #15
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    Re: Need Information for CO2 Purging in an Oil Tank

    Quote Originally Posted by jackdawg View Post
    Sounds like big tanks, you need professional advice on this one.
    I`m with stupid ↑↑↑↑

    Like I said earlier, contact a local engineering company, you don`t want to fool around with this.
    Quote Originally Posted by redlikesu View Post
    Well lets see i just came up with a solution to connect an oxygen analyzer that senses the content of o2 in tank.setting up with the upper flammable limit and lower flammable limit does the work as it supplies co2 with this limit.these analyzer connected to a control valve which will regulate the supply of co2 in tanks.Hope this is the one solution that works...still in research.
    Sounds way too complicated.

    I asked you earlier, why do you use co2 and not nitrogen N2 ?
    I assume you have to buy the CO2 ? It`s supplied in high-pressure cylinders ?
    You can make N2 on site with a nitrogen generator, it will be cheaper in the long term.

  16. #16
    Join Date
    Aug 2009
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    Re: Need Information for CO2 Purging in an Oil Tank

    I strongly agree with hiring a consultant. The company can afford it and you probably don't want to die to save them a few grand.

    A consultant can generate a full safety checklist and more important, relieve you of the liability for the solution in case someone else screws up and goes boom.

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