Electric Pump Drive For a Two-compartment Tanker
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QHOWN at Earls Court by The A.P.V. o.--) Co., Ltd., Crawley, Sussex, a 1,750gal. two-compartment milk tanker is equipped with an electrically driven pump system, the motor of which was specially developed by C.A.V., Ltd., to meet the requirements of the operators, Miers Transport, Ltd., Wolverhampton. The tank is mounted on a Guy Warrior chassis.
Normally connected to the power takeoff of the vehicle, the gear-type stainlesssteel rotary pump is driven by the electric motor through a 2 to I reduction gear. The motor is mounted above the pump in the rear compartment on the nearside. Electric drive has enabled the speed of the pump to be increased from 550 r.p.m. to 650 r.p.m., which gives a corresponding increase in output. Standard output is 5,000 gal. per hour for a head of 100 ft.
The motor is supplied by the vehicle battery, which has a capacity of 185 amp.-hr., compared with the normal rating of 89 amp.-hr. Dimensionally the battery is increased in size by some 25 per cent. A larger generator is also used, and the capacity of the system is sufficient to provide loading and unloading at the maximum r ate without assistance from the engine generator. The power unit is, therefore, switched off during pumping operations. The pump is a standard 30 R.E.C. unit, manufactured by Stainless Steel Pumps, Ltd., Eastbourne.
Advantages claimed for the system, in addition to increased output, include freedom from engine fumes during collections and deliveries, reduced installation and maintenance costs, and a reduction in the amount of engine idling. Fully tested experimentally for 12 months, the equipment has been employed for routine operations for the past three months.