2 replies to this topic

[vinod]

Sirs


How does providing foam in the seal rim of a floating roof tank having hydrocarbon protect it during a fire scenario?

Regards

Vinod

[Qalander (Chem)]

Sirs


How does providing foam in the seal rim of a floating roof tank having hydrocarbon protect it during a fire scenario?

Regards

Vinod

Dear Vinod, Just a general reply

Since this Annular space in case of floating roof is containing beneath the sealed area; a mixture of air (from atmosphere) stored product vapors and the roof contact with the shell inner surface is multiple time made and broken physically thus static charges may be a possible source of ignition.
Or this is the most vulnerable area containing almost all the components to induce (God Forbids) a fire

To counter this by design many beefed up safeguards are suggested/recommended by codes.
Such as Provision of Foam dam (about 0.6m height and 0.6m annular distance.)
Now this Foam dam is filled with Fire extinguishing/suppressing foam as per NFPA 11 and NFPA 30 guidelines

This takes care of fires occurring in this most susceptible location of floating roof tanks;through forming a stable(adequatelyrelenished) foam blanket
capable to seal off atmospheric air contact and cool down the on-fire materials.
Definitely all this is subject to adequate foam supplies/Contingency back-ups.
Well maintained/Tested foam deployment and aspiration systems to fulfill 'duty on demand'

Hope this helps for now.
Best regards
Qalander

[Qalander (Chem)]

Sirs


How does providing foam in the seal rim of a floating roof tank having hydrocarbon protect it during a fire scenario?

Regards

Vinod

Dear Vinod, Just a general reply

Since this Annular space in case of floating roof is containing beneath the sealed area; a mixture of air (from atmosphere) stored product vapors and the roof contact with the shell inner surface is multiple time made and broken physically thus static charges may be a possible source of ignition.
Or this is the most vulnerable area containing almost all the components to induce (God Forbids) a fire

To counter this by design many beefed up safeguards are suggested/recommended by codes.
Such as Provision of Foam dam (about 0.6m height and 0.6m annular distance.)
Now this Foam dam is filled with Fire extinguishing/suppressing foam as per NFPA 11 and NFPA 30 guidelines

This takes care of fires occurring in this most susceptible location of floating roof tanks;through forming a stable(adequatelyrelenished) foam blanket
capable to seal off atmospheric air contact and cool down the on-fire materials.
Definitely all this is subject to adequate foam supplies/Contingency back-ups.
Well maintained/Tested foam deployment and aspiration systems to fulfill 'duty on demand'

Hope this helps for now.
Best regards
Qalander

Dear vinod, Your response about reply is awaited that whether it was useful or useless?
Regards
Qalander