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- 100% of rated capacity at 150 psi net pump pressure. <br />-70% of rated capacity at 200 psi net pump pressure. <br />-50% of rated capacity at 250 psi net pump pressure. <br />Pump body will be close -grained gray iron, bronze fitted. <br />Impeller shaft will be stainless steel, accurately ground to size. It will be supported by oil or grease <br />lubricated, anti -friction ball bearings for rigid precise support. <br />Bearings will be protected from water and sediment by suitable stuffing boxes, slinger rings, and oil <br />seals. No special or sleeve type bearings will be used. <br />Pump will be equipped with a self-adjusting, maintenance -free, mechanical shaft seal. <br />The mechanical seal will consist of a flat, highly polished, spring fed carbon ring that rotates with the <br />impeller shaft. The carbon ring will press against a highly polished stainless steel stationary ring that is <br />sealed within the pump body. <br />In addition, a throttling ring will be pressed into the steel chamber cover, providing a very small <br />clearance around the rotating shaft in the event of a mechanical seal failure. The pump performance <br />will not deteriorate, nor will the pump lose prime, while drafting if the seal fails during pump operation. <br />Wear rings will be bronze and easily replaceable to restore original pump efficiency and eliminate the <br />need to replace the entire pump casing due to wear. <br />PUMP TRANSMISSION <br />The pump transmission will be made of a three (3) piece, aluminum, horizontally split casing. Power <br />transfer to pump will be through a high strength Morse HY-VO silent drive chain. By the use of a chain <br />rather than gears, 50 percent of the sprocket will be accepting or transmitting torque, compared to two <br />(2) or three (3) teeth doing all the work. <br />Drive shafts will be 2.35" diameter hardened and ground alloy steel and supported by ball bearings. <br />The case will be designed to eliminate the need for water cooling. <br />The chassis frame crossmembers will be designed with a center drop to allow the drive shaft to be <br />contained with -in the frame rails. <br />PUMPING MODE <br />An interlock system will be provided to ensure that the pump drive system components are properly <br />engaged so that the apparatus can be safely operated. The interlock system will be designed to allow <br />stationary pumping only. <br />AIR PUMP SHIFT' <br />Pump shift engagement will be made by a two (2) position sliding collar, actuated pneumatically (by tlir <br />pressure), with a three (3) position air control switch located in the cab. A manual back-up shift control <br />will also be located in the left side front compartment. <br />65 of 89 <br />