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- Page 1 PUBLICATION NUMBER OM -- 04760 December 2, 1998 Rev. A 11-20-03 SELF-PRIMING CENTRIFUGAL PUMPS THE GORMAN-RUPP COMPANY D MANSFIELD, OHIO GORMAN-RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA Printed in U.S.A. Copyright by the Gorman-Rupp Company...
- Page 2 ..............INTRODUCTION SELF-PRIMING CENTRIFUGAL PUMPS INTRODUCTION structions and precautions for every aspect of each specific application.
- Page 3 SELF-PRIMING CENTRIFUGAL PUMPS RECORDING MODEL AND SERIAL NUMBERS Please record the pump model and serial number in the spaces provided below. Your Gorman-Rupp distributor needs this information when you require parts or service. Pump Model: Serial Number: The following are used to alert personnel to procedures which require special attention, to those which...
- Page 4 This information applies to G-R Self- Priming Centrifugal pumps. These pumps are available as basic, pedestal- mounted models or as close-coupled models driven by either an electric mo- tor, gasoline or diesel engine. Refer to the manual accompanying the power source before attempting to begin oper- ation.
- Page 5 to a boil, build pressure, and cause the pump casing to rupture or explode. Do not remove plates, covers, gauges, pipe plugs, or fittings from an over- heated pump. Vapor pressure within the pump can cause parts being disen- gaged to be ejected with great force. Al- low the pump to cool before servicing.
- Page 6 Fuel used by internal combustion en- gines presents an extreme explosion and fire hazard. Make certain that all fuel lines are securely connected and free of leaks. Never refuel a hot or run- ning engine. Avoid overfilling the fuel tank. Always use the correct type of fuel. Never tamper with the engine governor to gain more power.
- Page 7 INSTALLATION --- SECTION B Review all SAFETY information in Section A. Since pump installations are seldom identical, this section offers only general recommendations and practices required to inspect, position, and ar- range the pump and piping. Most of the information pertains to a standard static lift application where the pump is positioned above the free level of liquid to be pumped.
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Page 8: Suction Lines
List manual to be sure your overall application al- lows the pump to operate within the safe operation range. PAGE B -- 2 SELF-PRIMING CENTRIFUGAL PUMPS Materials Either pipe or hose maybe used for suction and discharge lines; however, the materials must be compatible with the liquid being pumped. - Page 9 slopes down to the pump at any point along the suction run, air pockets will be created. Fittings Suction lines should be the same size as the pump inlet. If reducers are used in suction lines, they should be the eccentric type, and should be in- stalled with the flat part of the reducers uppermost to avoid creating air pockets.
- Page 10 OM -- 04760 SELF-PRIMING CENTRIFUGAL PUMPS PAGE B -- 4 INSTALLATION...
- Page 11 minimize the chance of plugging. In low discharge head applications (less than 30 feet or 9 meters), it is recommended that the by- pass line be run back to the wet well, and located 6 inches below the water level or cut-off point of the low level pump.
- Page 12 Figure 2. Valve in Open Position During the priming cycle, air from the pump casing flows through the bypass line, and passes through the Air Release Valve to the wet well (Figure 2). Figure 3. Valve in Closed Position When the pump is fully primed, pressure resulting from flow against the valve diaphragm com- presses the spring and closes the valve (Figure 3).
- Page 13 N O T E SELF-PRIMING CENTRIFUGAL PUMPS OM -- 04760 INSTALLATION PAGE B -- 7 A LIGNM EN T...
- Page 14 When checking alignment, disconnect the power source to ensure that the pump will remain inoperative. Adjusting the alignment in one direction may alter the alignment in another direc- tion. check each procedure after altering alignment. Coupled Drives When using couplings, the axis of the power source must be aligned to the axis of the pump shaft in both the horizontal and vertical planes.
- Page 15 Select pulleys that will match the proper speed ra- tio; overspeeding the pump may damage both pump and power source. Do not operate the pump without the guard in place over the rotating parts exposed rotating parts can catch cloth- ing, fingers, or tools, causing severe in- jury to personnel.
- Page 16 SELF-PRIMING CENTRIFUGAL PUMPS OPERATION --- SECTION C Review all SAFETY information in Section A. Follow the instructions on all tags, labels and de- cals attached to the pump. Do not attempt to pump any liquids the pump has not been designed for, and...
- Page 17 PAGE C -- 2 SELF-PRIMING CENTRIFUGAL PUMPS sure which could damage pipe ends, gaskets, sprinkler heads, and any other fixtures connected to the line. When the discharge line is completely filled, adjust the throttling valve to the required flow rate.
- Page 18 SELF-PRIMING CENTRIFUGAL PUMPS ter the pump cools, drain the liquid from the pump by removing the casing drain plug. Use caution when removing the plug to prevent injury to personnel from hot liquid. If overheating does occur, stop the pump immedi- ately and allow it to cool before servicing it.
- Page 19 Con- tinued operation should bring the temperatures down to normal levels. PAGE C -- 4 SELF-PRIMING CENTRIFUGAL PUMPS LUBRICATION Do not remove plates, covers, gauges, pipe plugs or fittings from an over- heated pump. Vapor pressure within the pump can cause parts being disen- gaged to be ejected with great force.
- Page 20 SELF-PRIMING CENTRIFUGAL PUMPS stem; this will release the spring to apply grease to the seal. Oil Lubricated Bearings Bearing housings are fully lubricated when shipped from the factory. Check the oil level regu- larly and maintain it at the desired level. When lubri- cation is required, add SAE No.
- Page 21 July 18, 1979 WARRANTY Pumping units manufactured by The Gorman-Rupp Company, Mansfield, Ohio are guaranteed to be free from defects in mate- rial and workmanship for one year from date of shipment from factory in Mansfield, Ohio. The obligation under this Warranty, statutory or otherwise, is limited to replacement or repair at Mansfield, Ohio factory or at a point designated by Gorman- Rupp, of such part as shall appear to us upon inspection at such...
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