4 replies to this topic

[Root]

Dear Forum members,

attached is existing crude oil storage tank skecth, tank venting is big problem because of heavy smoke in LP flare. staff resident camp is very close to production facility hardly 500 meters away. the design of blankiting and venting is different from today crude oil storage and handling.

balnkit gas is coming from dehydrator outlet and from de-gassing boot directly with out controlling and LP gas going to flare from is controlled by PCV on 20'' dia line. tank pressure is only 0.2 psig.

Maximum crude inlet flow is 25000BOPD to de-gassing boot. I think, if we can modify the de-gassing boot vapour outlet line and divert to flare and regulate the dehydrator gas by installing the PRV this problem can be solved but i need some more input in this regards.

Thanks

Toor

Attached Files

•  Crude Storage Tank N.Waha.pdf   5.4KB   51 downloads

[fallah]

Toor,

 

In the similar system with which I am familiar, the outlet gas line of degassing boot is directly conducted to the relevant flare network along with the outgoing line from depad valve of the storage tank; and the blanketing gas is to be supplied from another source. If it's intended to use such gas for blanketing, it should be controlled in flow rate and there would be a back up blanketing gas in the cases with lack/shortage of the gas of degassing boot...

But your suggestion is also could be reasonable and practical to divert the vapor outlet of degassing boot to flare and using the dehydrator gas as blanketing gas by regulating through a PCV but with a back up blanketing gas in the lack/shortage of the dehydrator gas... 

[Root]

Fallah,

What about installing a PCV on De-gasser boot vaouper out line, well this have effects on degassing or not because crude inlet to de-gassing boot have 30 psig.

Thanks

Toor

[fallah]

Toor,

 

Installing a PCV on degasser boot vapor outlet line by which the pressure of the tank is kept at, let say, 0.2 psig as you mentioned; will affect on degassing performance by variation in operating pressure of degasser...

[Root]

Fallah Thanks

Toor