Monitoring fuel vapor flow in vapor recovery system

Fluent material handling – with receiver or receiver coacting mea – Diverse fluid containing pressure filling systems involving... – Filling with exhausting the receiver

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141 95, 141 7, 137587, B67D 5378

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active

057656037

ABSTRACT:
A vapor recovery system monitoring system includes a vacuum monitor and a vent sensor. The vacuum monitor has a signal relay in communication with a vacuum system served by a vacuum source to generate a first signal upon actuation of the vacuum source for recovery of displaced fuel vapor and a second signal when a minimum vacuum level is achieved; a timer measuring elapsed time between first and second signal; a comparator comparing elapsed time with a predetermined standard; and an error display actuated when the predetermined number of instances of elapsed time is exceeded. The vent sensor, mounted to a vent conduit for an underground storage tank, defines an orifice creating a pressure differential when volume flow of vent emission exceeds a predetermined level; a pressure differential switch; a counter receiving a signal from the pressure differential switch for indication of venting frequency over a predetermined time period; a timer receiving a signal from the pressure differential switch for indication of total venting time over a predetermined time period; a comparator comparing total venting time with a predetermined acceptable total venting time; and an error message display actuated when a predetermined acceptable total venting time is exceeded. A method for monitoring a vapor recovery system is also described.

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