[Gary Pitman]

Having the anti-foam controlled by level does work. We have had this control system for many years. Anti-foam rate is controlled through a metering pump and then injected into the CLGO carrier. The line to the drum is packed and the response time is immediate.
We can run either CHGO or CLGO we prefer CLGO.
I would not want any storage of anti-foam on the structure.

[Gary Pitman]

We have had many discussions about this:
The PSV is designed for out flow
The PSV is robust by design and routinely inspected
The PSV has a steam tattletale if the bellows has been blown
In 33 years, we have never had gasses from the flare over come the steam purge and the integrity of the valve.
No history of a PSV failure in reverse flow
We have downstream block valves they are car sealed open and not used for LOTO unless the PSV is removed for maintenance.
Our operators all have H2S montiors on while in the unit.

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