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MTDC Batch Mixer

Batch Mixer Owner’s Manual (continued)

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Theory of Operation

The batch mixer mixes gelling agent with gasoline by agitating and re-circulating gasoline through a pump. This pump is also used to fill the helitorch from the batch mixer. The pump takes suction from a 90-degree valve installed in the bottom of the tank. Flow from the pump is discharged through a 3-way valve that may be set in the re-circulation or discharge position. When the valve is set in the re-circulation position, the gasoline flows through a shutoff valve in the end of the tank, into a re-circulation tube, through the re-circulation tube flow nozzles, and back into the tank. The configuration of the re-circulation tube causes agitation of the gasoline. This agitation mixes the gelling agent with the gasoline.

When the 3-way valve is set in the discharge position, flow from the pump is diverted to the hose reel and out to fill the helitorch.

The batch mixer is also equipped with a pressure relief system. During normal operation, the relief valve should remain closed. If the system experiences an overpressure from a closed dry break, closed tank valve, or other cause, the relief valve will open and allow fuel from the pump discharge to flow to the inlet side of the pump. If the relief valve opens the system should be shut down and the cause of the overpressure determined.

Relief Valve