Bleeder vent

[Alirezaparsa]

Why some bleeder vent, bleeding crude oil on tank's roof?

 

[HTURKAK]

API 650 APPENDIX C—EXTERNAL FLOATING ROOFS C.3.9 VENTS ;
'..... The Manufacturer shall determine and recommend the number and sizes of bleeder vents to be provided based on maximum filling and emptying rates specified....'

The picture implies, no.and size of bleeders not conforming with filling and emptying rates ..

 

[LittleInch]

Also is this one closer to the inlet nozzles?

Any gas entering via those could force Crude out as the gas escapes.

Need rather more detail here but look at location versus potential for gas bubbles entering the tank.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Geoff13]

I've seen floating roofs with small pools of oil on top of them, so your case is very minor.

LittleInch is on the right track. You should consider whether gas bubbles can be in the inlet feed, or any light products that might flash to vapour. As the pipe is quite small you won't need much vapour to splash this small amount of product.

 

[Dhurjati Sen]

If this is a safety / environment issue, replace the bleeder vent.

DHURJATI SEN
Kolkata, India