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RE: Atmospheric venting

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when you open the vent if because you is thinking the drum is cool low temperature less 250F and pressure less 2 psig, (when you open the vent for an operator expert he can tell you if the drum still hot; for the sound or amount of the steam , etc) and then the operator procedure to drain the drum (there is some refinery after opening the vent they open the top flange) this take between 20 t0 30 minute

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