3 replies to this topic

[Lowflo]

In Saudia Arabia and Kuwait, does dust and dirt accumulating in the PRV tailpipes cause a problem for atmospheric PRVs?

With regard to this particular risk, is anything special done in this region that is different from what is done in other parts of the world?

Thanks.

[jrtailor09]

Lowflo,

I am agree with your concern but here i have seen SRV discharge left to atmosphere is not provided with any other arrangement.

Regards,
Jatin

[ankur2061]

Lowflo,

In current times, there are very few applications where the PRV discharges to the atmosphere. The tendency is to hook up the PRV tail pipe to the flare system. In some rare cases, a canopy is provided at the end of the tail-pipe discharging to atmosphere to prevent ingress of sand and dust. But this is more of an exception than a rule and I wouldn't count on a canopy preventing ingress of sand and dust effectively.

One more option where sand / dust is a problem, would be to provide a blowdown vessel connecting multiple such PSVs (atmospheric discharging). The vent from the blowdown would be atmospheric with a canopy provided at the vent outlet. Quite clearly an expensive option (blowdown vessel cost as well as cost / equipmnet for removal of any residual liquid) as well as leading to a certain backpressure at the PSV outlet.

IMHO, the best option would be to connect the PSV outlet to the flare system if the fluid discharging from the PSV is not incompatible with the flare system.

Regards,
Ankur.

[fallah]

IMHO, the best option would be to connect the PSV outlet to the flare system if the fluid discharging from the PSV is not incompatible with the flare system.

Ankur,

Then, even if the distances/elevations allow those PSV's be connected to flare network, type of most of them might be changed from conventional to balanced bellows or pilot operated.

Lowflo,

In such dirty conditions a rupture disc, with lower set pressure, downstream of the PSV might be a solution against dust accumulation in relevant short tail pipe.

Edited by fallah, 22 December 2012 - 01:37 PM.