Question: A 2 0 0 0 - m 3 vessel containing liquid methanol must be prepared for entry. After draining, it must first be purged with

A 2000-m3 vessel containing liquid methanol must be prepared for entry. After draining, it must first be
purged with nitrogen (98% nitrogen and 2% oxygen from a membrane unit) and then purged with air to reach a
fuel composition of 0.1% of the TLV-TWA. Use sweep through purging, assuming a pressure of 1 atm, a
temperature of 25\deg C, and purging rates (for nitrogen and air) of 10 m3/min.

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