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A pedestal sump pump with a float switch. A float switch is a type of level sensor, a device used to detect the level of liquid within a tank. The switch may be used to control a pump, as an indicator, an alarm, or to control other devices. One type of float switch uses a mercury switch inside a hinged float.
Features may include controls for fully automatic operation; a high-level alarm indication, in the event of pump failure; and possibly a guide-rail/auto-coupling/pedestal system, to permit easy removal of pumps for maintenance. Traditional site constructed systems have the valve vault components installed in a separate structure.
4a System based on fuel reconciliation (measurement of amount sold through the dispenser against the amount that goes out of the tank according to the tank gauge).Any discrepancies release an alarm. 4b Detection of tank leak in quiet periods (liquid level is changing while the tank is not dispensing fuel).
When the alarm goes off, the OCM functionality will be checked by crew members. [1] An OCM is a small part of what is called the oil discharge monitoring and control system. The first part is the oil content meter. The second is a flow meter which measures the flow rate of the water at the discharge pipe. [5]
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The tank had a level gauge that employees used to monitor the level manually, and an independent high-level switch which would shut off inflow if the level got above a certain setpoint. On Tank 912, the manual gauge was stuck and the independent shut-off switch was inoperative, meaning that the tank was being "filled blind" with petrol (i.e ...