What should the methanol washing unit do in case of a shutdown due to a loss of instrument air throughout the plant?
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What should the methanol washing unit do in case of a shutdown due to a loss of instrument air throughout the plant?
Upon the interruption of instrument air throughout the plant, gas supply is cut off; treat it as an emergency shutdown! The various control valves will not function, so the shut-off valve for on-site liquid level control is closed. Attention should be paid to the reversal of the pumps in the methanol washing unit to prevent high pressure from leaking into the low pressure system. Stabilize the pressure in each tower. Based on the recovery situation, implement a short-term shutdown!
First, shut off the valve that connects the high and low pressures to prevent high pressure from mixing with low pressure! Danger! Then carry out an emergency stop following the normal shutdown procedures, and wait for further actions!