2 replies to this topic

[cat]

Hi all,
We have two flare system, hot and cold. The flare tips are stacked side by side, approximately ~0.4 to 0.5m difference, center to center. The plan is to turn off the hot flare as the hot KO drum is intended to be inspected. The cold flare is still, however, in service as we have some equipment connected to it that are in service. The hot flare still have some PSV's connected, but mostly fire case PSVs, and the actions to be taken for this is to stop any hot work activity on the equipment connected.

I am unsure if there are any safety implications if we proceed with this path forward, i.e, as there may be burned HCs and steam, is there a potential for the fluids release to "go" into the adjacent stack, given that there wind dynamics and release velocity (depending on the instances of the HC's flared) may change. We've tried to ask the vendor and there was no definite answer.

Thank you all.

[Movers]

I suggest to wait for shut off the whole plant and than turn off the flare. If there is no other option than revision of KO drum now I would rather consider shut off the plant connected with this flare and then do the inspection. There will be production losses but safety first. Remember that flare system is very important frrom the safety point of view. You may try hard make everythink in a safe way but an accident can always happen. In case that you turn off the flare and some accident will happen (material damage or someone will be harmed) I am pretty sure that person who has made decision about shut off the flare will be the first charged.

 

Regards

Edited by Movers, 17 October 2019 - 11:01 AM.

[cat]

Hi,

Actually, what is connected to the cold flare are PVs for two cryogenic tanks, although, the BOG compressors are working during this time, hence based on data, the demand for the PVs on these tanks connected to the cold flare is very small. On the hot flare, aside from fire case PSVs, blocked discharge scenarios are on the BOG compressors, but there are high alarms provided to which operator can utilize to stop the BOG compressors (closed monitoring activity). Aside from these, 1 more PV on the accumulator (within the BOG system) is connected, but as long as the BOG system is okay, the demand for this PV is also small.

Options we have considered is to jumpover this one PV (2" valve) to the cold flare line (there are isolation valves we can utilize), however, as per above, I am unsure that it is okay to have the cold flare running whereas the hot flare is turned off considering the distances between them. Another option is to have these lines rerouted to atmosphere, size and length are based on dispersion models.