[David Maia]

Generally there is a steam injection before and after the PSV, for line cleaning. The probability of the backflow from blowdown reach the drum is very low. Is the MOV really necessary ?

[David Maia]

Some refineries start the drainig whitout open the vent, with the drum still connected whith the blown down and pressurized. Then after some time, when the pressure get low the operator isolate the drum and open the vent. There is a risk of hot spots and send HC to atmosphere by the blow down but you gain a valuble time.

[Author]

Posts