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 D ST. THOMAS, ONTARIO, CANADA eCopyright by the Gorman-Rupp Company Printed in U.S.A.
OM -- 04760 SELF-PRIMING CENTRIFUGAL PUMPS INTRODUCTION Thank You for purchasing a Gorman-Rupp SelfPriming Centrifugal Pump. Read this manual carefully to learn how to safely install and operate your pump. Failure to do so could result in personal injury or damage to the pump. A set of three manuals accompanies your pump. Each set consists of three parts; the Installation/ Operation Manual contains essential information on installing and operating the pumps.
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: OM -- 04760 WARRANTY INFORMATION The warranty provided with your pump is part of Gorman-Rupp’s support program for customers who operate and maintain their equipment as described in this and the other accompanying literature.
SELF-PRIMING CENTRIFUGAL PUMPS OM -- 04760 SAFETY - SECTION A This information applies to G-R SelfPriming Centrifugal pumps. These pumps are available as basic, pedestalmounted models or as close-coupled models driven by either an electric motor, gasoline or diesel engine. Refer to the manual accompanying the power source before attempting to begin operation.
OM -- 04760 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 overheated pump. Vapor pressure within the pump can cause parts being disengaged to be ejected with great force. Allow the pump to cool before servicing. These pumps may be used to handle products which if overheated could produce dangerous fumes. Use extreme caution when venting the pump, or when removing covers, plates, plugs, or fittings.
SELF-PRIMING CENTRIFUGAL PUMPS OM -- 04760 uous operating speed for the pump is shown on the performance curve (see the Parts List Manual). Fuel used by internal combustion engines 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 running engine. Avoid overfilling the fuel tank. Always use the correct type of fuel. Never tamper with the engine governor to gain more power.
SELF-PRIMING CENTRIFUGAL PUMPS OM -- 04760 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 arrange 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.
OM -- 04760 SELF-PRIMING CENTRIFUGAL PUMPS PAGE B -- 2 INSTALLATION
SELF-PRIMING CENTRIFUGAL PUMPS 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 installed with the flat part of the reducers uppermost to avoid creating air pockets. Valves are not normally used in suction lines, but if a valve is used, install it with the stem horizontal to avoid air pockets.
OM -- 04760 SELF-PRIMING CENTRIFUGAL PUMPS PAGE B -- 4 INSTALLATION
SELF-PRIMING CENTRIFUGAL PUMPS minimize the chance of plugging. In low discharge head applications (less than 30 feet or 9 meters), it is recommended that the bypass 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. In some installations, this bypass line may be terminated with a six-to-eight foot length of 1 1/4 inch I.D.
OM -- 04760 SELF-PRIMING CENTRIFUGAL PUMPS liters per minute) will occur when the valve is fully closed. Be sure the bypass line is directed back to the wet well or tank to prevent hazardous spills. When the pump shuts down, the spring returns the diaphragm to its original position. Any solids that may have accumulated in the diaphragm chamber settle to the bottom and are flushed out during the next priming cycle. Figure 2.
SELF-PRIMING CENTRIFUGAL PUMPS INSTALLATION OM -- 04760 PAGE B -- 7
OM -- 04760 SELF-PRIMING CENTRIFUGAL PUMPS 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 direction. 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.
SELF-PRIMING CENTRIFUGAL PUMPS OM -- 04760 Select pulleys that will match the proper speed ratio; 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 clothing, fingers, or tools, causing severe injury to personnel.
OM -- 04760 SELF-PRIMING CENTRIFUGAL PUMPS OPERATION --- SECTION C Review all SAFETY information in Section A. Follow the instructions on all tags, labels and decals attached to the pump. Do not attempt to pump any liquids the pump has not been designed for, and which may damage the pump or endanger personnel as a result of pump failure. Pump speed and operating conditions must be within the performance range shown on the curve in Parts Lists manual. Add liquid to the pump casing when: 1.
OM -- 04760 companying decals. Reverse rotation could loosen the impeller and seriously damage the pump. If the pump is driven by an electric motor, consult the operating manual furnished with the motor before attempting to start the motor. If rotation is incorrect on a three-phase motor, have a qualified electrician interchange any two of the three phase wires to change direction. If rotation is incorrect on a single-phase motor, consult the literature supplied with the motor for specific instructions.
OM -- 04760 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 immediately and allow it to cool before servicing it. Approach any overheated pump cautiously.
OM -- 04760 After stopping the pump, lock out or disconnect the power source to ensure that the pump will remain inoperative. Cold Weather Preservation In below freezing conditions, drain the pump to prevent damage from freezing. Also, clean out any solids by flushing with a hose. Operate the pump for approximately one minute; this will remove any remaining liquid that could freeze the pump rotating parts.
OM -- 04760 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 regularly and maintain it at the desired level. When lubrication is required, add SAE No. 30 non-detergent oil. Do not over-lubricate. Over-lubrication can cause the bearings to over-heat, resulting in premature bearing failure.
July 18, 1979 WARRANTY Pumping units manufactured by The Gorman-Rupp Company, Mansfield, Ohio are guaranteed to be free from defects in material 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 GormanRupp, of such part as shall appear to us upon inspection at such point, to have been defective in material or workmanship.
