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RE: Coke Drum Relief


coker squirrel

We are riding a Low Line system (gas recovery system) on one coker unit and are riding the Fractiontor OH Accumulator on the other coker unit so we do not flare unless we overpressure the Low Line or Fractionator OH. The main exposure we have for a reverse flow on a bad relief valve is when another Drum overhead vapors are switched to the blowdown system. It is a rare event when we get a reverse flow but never-the-less, it is an exposure. In 36 years, we have only had just a few of these events happen.

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