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Emergency Vent [1]

A vent installed on an aboveground tank to provide for vapor release in event of excessive pressure build-up resulting from fire exposure of the tank. Such vents are designed to operate at higher pressure settings and to allow a greater flow rate of vapors than those which actuate the operation of pressure/vacuum vents on normal vent pipes.

Aboveground storage tanks have two separate openings for vents–one for emergency venting and one for normal venting.

Source URL (modified on 10/15/2014): https://testing.pei.org/wiki/emergency-vent

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[1] https://testing.pei.org/wiki/emergency-vent