Gorman-Rupp Pumps RD2A31-BAR User Manual

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PUBLICATION NUMBER OM-03989 January 21, 1994 Rev. D 05‐10‐12
RS AND RD
THE GORMAN‐RUPP COMPANY MANSFIELD, OHIO
GORMAN‐RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
www.grpumps.com
1994 The Gorman‐Rupp Company
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Register your new
Gorman‐Rupp pump online at
www.grpumps.com
Valid serial number and e‐mail address required.
RECORD YOUR PUMP MODEL AND SERIAL NUMBER
Please record your 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:
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OM-03989 RS AND RD SERIES PUMPS

INTRODUCTION

Thank You for purchasing a Gorman‐Rupp RS or
RD Roto‐PrimeSeries 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 pump. However, since pump installations are seldom identical, some of the information only summarizes general recommendations and practices required to in spect, position, and arrange the pump and piping.
The Parts List Manual provides performance curve(s), a pump model cross‐section drawing, and parts list for your pump.
The Maintenance and Repair Manual provides troubleshooting and maintenance instructions re quired to properly diagnose operational problems, and to service the pump components. Contact the factory for the authorized repair facility closest to you.
This pump is a Roto‐Prime self‐priming centrifu gal petroleum pump, designed to handle petro leum products only. It incorporates an integral va riable‐capacity vane pump which automatically evacuates air and vapor from the suction line. This pump should not be used to handle water or other non‐petroleum liquids. For specific service, con tact your Gorman‐Rupp distributor or the Gorman‐ Rupp Company.
The basic pump is not furnished with a mounting base and power source; however, these items are
available from the factory as optional equipment. The pump is designed to be driven by an explo sion‐proof motor with a maximum full load speed of either 1750 RPM (RS Series) or 3450 RPM (RD Series).
Because pump installations are seldom identical, this manual cannot possibly provide detailed in structions and precautions for every aspect of each specific application. Therefore, it is the re sponsibility of the owner/installer of the pump to ensure that applications not addressed in this manual are performed only after establishing that neither operator safety nor pump integrity are com promised by the installation. Pumps and related equipment must be installed and operated ac cording to all national, local and industry stan dards.
If there are any questions regarding the pump which are not covered in this manual or in other lit erature accompanying the unit, please contact your Gorman‐Rupp distributor or the Gorman‐ Rupp Company:
The Gorman‐Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-1217
Phone: (419) 755-1011
or:
Gorman‐Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
Phone: (519) 631-2870
CONTENTS
SAFETY - SECTION A INSTALLATION - SECTION B
GENERAL INFORMATION PAGE B - 1.....................................................
PUMP DIMENSIONS PAGE B - 1..........................................................
PREINSTALLATION INSPECTION PAGE B - 1...............................................
POSITIONING PUMP PAGE B - 2..........................................................
GROUNDING PAGE B - 2................................................................
SUCTION AND DISCHARGE PIPING PAGE B - 2............................................
SUCTION LINES PAGE B - 3..............................................................
DISCHARGE LINES PAGE B - 6...........................................................
ALIGNMENT PAGE B - 7.................................................................
PAGE I - 1INTRODUCTION
Page 4
OPERATION - SECTION C
GENERAL INFORMATION PAGE C - 1.....................................................
PRIMING PAGE C - 1....................................................................
STARTING PAGE C - 4...................................................................
OPERATION PAGE C - 4.................................................................
STOPPING PAGE C - 5...................................................................
BEARING TEMPERATURE CHECK PAGE C - 5.............................................
OM-03989RS AND RD SERIES PUMPS
RECORDING MODEL AND
WARRANTY INFORMATION
SERIAL NUMBERS
The warranty provided with your pump is part of
Please record the pump model, serial number, volt age, and motor frame size 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 could damage equipment, and to those which could be dangerous to personnel:
Immediate hazards which WILL result in severe personal injury or death. These instructions describe the procedure re quired and the injury which will result from failure to follow the procedure.
Gorman‐Rupp's support program for customers who operate and maintain their equipment as de scribed in this and the other accompanying litera ture. Please note that should the equipment be abused or modified to change its performance be yond the original factory specifications, the war ranty will become void and any claim will be de nied.
Hazards or unsafe practices which COULD result in minor personal injury or product or property damage. These instructions de scribe the requirements and the possible damage which could result from failure to follow the procedure.
NOTE
Hazards or unsafe practices which
Instructions to aid in installation, operation, and maintenance or which clarify a procedure.
COULD result in severe personal injury or death. These instructions describe the procedure required and the injury which could result from failure to follow the procedure.
PAGE I - 2 INTRODUCTION
Page 5
OM-03989 RS AND RD SERIES PUMPS

SAFETY - SECTION A

The following information applies throughout this manual to Gorman‐ Rupp RS and RD Roto‐Primer Series basic pumps.
Because pump installations are seldom identical, this manual cannot possibly provide detailed instructions and pre cautions for each specific application. Therefore, it is the owner/installer's re sponsibility to ensure that applications not addressed in this manual are per formed only after establishing that nei ther operator safety nor pump integrity are compromised by the installation.
Before attempting to install, operate, or service this pump, familiarize yourself with this manual, and with all other liter ature shipped with the pump. Unfamil iarity with all aspects of pump operation covered in this manual could lead to de struction of equipment, injury, or death to personnel.
Before attempting to open or service the pump:
4. Check the temperature before opening any covers, plates, or plugs.
5. Close the suction and discharge valves.
6. Vent the pump slowly and cau tiously.
7. Drain the pump.
This pump is designed to handle petro leum products or other similar hydro carbon liquids. Do not attempt to pump water, corrosive materials, or any liq uids which may damage the pump or en danger personnel as a result of pump failure.
This pump is designed to be used with volatile and/or flammable liquids; be certain proper safety practices are fol lowed before operating or servicing the pump. Provide adequate ventilation, prohibit smoking, wear static‐resistant clothing and shoes. Clean up all fuel spills immediately after occurrence.
1. Familiarize yourself with this man ual.
2. Shut off the incoming power to the motor and lock it out, or take other action to ensure that the pump will remain inoperative.
3. Allow the pump to completely cool if overheated.
Do not operate the pump against a closed discharge valve for long periods of time. If operated against a closed dis charge valve, pump components will deteriorate, and the liquid could come to a boil, build pressure, and cause the pump casing to rupture or explode.
PAGE A - 1SAFETY
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RS AND RD SERIES PUMPS OM-03989
6. Refer to instructions in this manual before restarting the pump.
After the pump has been installed, make certain that the pump and all piping con nections are tight, properly supported and secure before operation.
Do not install and operate a non‐explo sion proof motor in an explosive atmo sphere. Install, connect, and operate the motor in accordance with The Na tional Electric Code and all local codes.
This pump is designed to be used with volatile and/or flammable liquids; over heating may produce dangerous fumes. Take precautions to ensure the area sur rounding the pump is adequately venti lated. Allow the pump to completely cool and use extreme caution when venting the pump, or when removing covers, plates, plugs, or fittings.
If there is a conflict between the instruc tions in the manual accompanying the unit and The National Electric Code or the applicable local code, The National or local code shall take precedence. All electrical equipment supplied with this pump conformed to applicable federal regulations and national codes in effect on the date of manufacture.
Overheated pumps can cause severe burns and injuries, and produce explo sive fumes. If overheating of the pump occurs:
1. Stop the pump immediately.
2. Ventilate the area.
3. Allow the pump to completely cool.
4. Check the temperature before opening any covers, plates, gauges, or plugs.
5. Vent the pump slowly and cau tiously.
This pump is not designed to handle water. Operation of the pump with water or water‐ based solutions will damage the group grind within the vane‐type priming pump. Do not connect this pump to a storage tank which has been filled with water until the tank and lines have been completely drained and flushed. Install a commercially available 80 mesh screen and a filter in the suction line to prevent debris from entering the pump. Check pump rotation with the suction line disconnected.
PAGE A-2 SAFETY
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OM-03989 RS AND RD SERIES PUMPS

INSTALLATION - SECTION B

GENERAL INFORMATION
Review all SAFETY information in Section A.
Since pump installations are seldom identical, this section is intended only to summarize general rec ommendations and practices required to inspect, position, and arrange the pump and piping. If there are any questions concerning your specific instal lation, contact your Gorman‐Rupp distributor or the Gorman‐Rupp Company.
This pump is not designed to handle water. Operation of the pump with water or water‐ based solutions will damage the group grind within the vane‐type priming pump. Do not connect this pump to a storage tank which has been filled with water until the tank and lines have been completely drained and flushed. Install a commercially available 80 mesh screen and a filter in the suction line to prevent debris from entering the pump. Check pump rotation with the suction line disconnected.
contact your Gorman‐Rupp distributor or the Gor man‐Rupp Company.
PREINSTALLATION INSPECTION
The pump assembly was inspected and tested be fore shipment from the factory. Before installation, inspect the pump for damage which may have oc curred during shipment. Check as follows:
a. Inspect the pump for cracks, dents, damaged
threads, and other obvious damage.
b. Check for and tighten loose attaching hard
ware. Since gaskets tend to shrink after dry ing, check for loose hardware at mating sur faces.
c. Carefully read all tags, decals, and markings
on the pump assembly, and perform all duties indicated. Note the direction of rotation indi cated on the pump. Check that the pump shaft rotates in the required direction.
Most of the information pertains to a standard stat ic lift application, where the pump is positioned above the free level of the liquid to be pumped.
If installed in a flooded suction application, where the liquid is supplied to the pump under pressure, some of the information such as mount ing, line configuration, and priming must be tai lored to the specific application. Since the pres sure supplied to the pump is critical to perform ance and safety, be sure to limit the incoming pres sure to 50% of the maximum permissible operating pressure shown on the pump performance curve.
For further assistance, contact your Gorman‐Rupp distributor or the Gorman‐Rupp Company.
PUMP DIMENSIONS
For the approximate physical dimensions of your pump, refer to the pump specification data sheet or
Only operate this pump in the direction in dicated on the pump body and/or the ac companying decal. Reverse rotation of the shaft will adversely effect pump perform ance, and the pump could be seriously damaged.
d. Check levels and lubricate as necessary. Re
fer to LUBRICATION in the MAINTENANCE AND REPAIR section of this manual and per form duties as instructed.
e. If the pump and power source have been
stored for more than 12 months, some of the components or lubricants may have ex ceeded their maximum shelf life. These must be inspected or replaced to ensure maxi mum pump service.
PAGE B - 1INSTALLATION
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RS AND RD SERIES PUMPS OM-03989
If the maximum shelf life has been exceeded, or if anything appears to be abnormal, contact your Gorman‐Rupp distributor or the factory to deter mine the repair or updating policy. Do not put the pump into service until appropriate action has been taken.
POSITIONING PUMP
Lifting
Use lifting equipment with a capacity of at least 5 times the weight of the pump, including the
weight of options and customer installed accessories. Customer installed equipment such as suction and discharge piping and fittings must be removed before attempting to lift the pump.
The pump assembly can be seriously damaged if the cables or chains used to lift and move the unit are improperly wrapped around the pump.
contact the factory to obtain optional springs for the priming pump group grind. If the vibration is not corrected, the tubing could fatigue and rupture, spilling the liq uid being pumped and resulting in a fire hazard.
GROUNDING
To eliminate electrostatic build‐up by the liquid be ing pumped, it is recommended that the pump be grounded by attaching a ground wire assembly to a ground rod. Install the ground rod in accordance with the National Electrical Code and all local codes. Be sure the clamp or fastener has made a tight electrical connection with the rod.
Inspect and test the ground wire assembly for conductivity. Replace broken or frayed wire before resuming operation.
For the approximate weight of your pump, refer to the pump specification data sheet or contact your Gorman‐Rupp distributor or the Gorman‐Rupp Company.
Mounting
Locate the pump in an accessible place as close as practical to the liquid being pumped. Level mount ing is essential for proper operation.
The pump may have to be supported or shimmed to provide for level operation or to eliminate vibra tion.
When the pump is installed under unusual conditions, the priming tube(s) may vi brate abnormally. If this occurs after the pump and piping are properly secured,
SUCTION AND DISCHARGE PIPING
Damage to the pump resulting from debris in the suction line will not be covered by the pump warranty. Before connecting the suction and discharge piping, carefully check the storage tank and piping for con struction debris such as nuts, bolts, wire, weld slag, and other foreign material. In stall a commercially available 80 mesh screen and a filter in the suction line to pre vent debris from entering the pump.
Pump performance is adversely effected by in creased suction lift, discharge elevation, and fric tion losses. See the performance curve and oper ating range shown in the Parts List manual to be sure your overall application allows the pump to operate within the safe operation range.
PAGE B - 2 INSTALLATION
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OM-03989 RS AND RD SERIES PUMPS
Materials
Either pipe or hose maybe used for suction and discharge lines; however, the materials must be compatible with the liquid being pumped. If hose is used in suction lines, it must be the rigid‐wall, rein forced type to prevent collapse under suction. Us ing piping couplings in suction lines is not recom mended.
Line Configuration
Keep suction and discharge lines as straight as possible to minimize friction losses. Make mini mum use of elbows and fittings, which substan tially increase friction loss. If elbows are necessary, use the long‐radius type to minimize friction loss.
Connections to Pump
Before tightening a connecting flange, align it ex actly with the pump port. Never pull a pipe line into place by tightening the flange bolts and/or cou plings.
Lines near the pump must be independently sup ported to avoid strain on the pump which could cause excessive vibration, decreased bearing life,
INCORRECT PITCH
and increased shaft and seal wear. If hose‐type lines are used, they should have adequate support to secure them when filled with liquid and under pressure.
Gauges
Most pumps are drilled and tapped for installing discharge pressure and vacuum suction gauges. If these gauges are desired for pumps that are not tapped, drill and tap the suction and discharge lines not less than 18 inches (457,2 mm) from the suction and discharge ports and install the lines. Installation closer to the pump may result in erratic readings.
SUCTION LINES
To avoid air pockets which could affect pump prim ing, the suction line must be as short and direct as possible. When operation involves a suction lift, the line must always slope upward to the pump from the source of the liquid being pumped; if the line slopes down to the pump at any point along the suction run, air pockets will be created.
Refer to Figure 1 for the recommended configura tion of the suction line.
INCORRECT LOOPS
PITCH UP TO
SUCTION
WITH NO
LOOPS
VAPOR
POCKETS
RECOMMENDED
POCKETS
Figure 1. Suction Line Configuration
VAPOR
POCKETS
NO
PAGE B - 3INSTALLATION
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RS AND RD SERIES PUMPS OM-03989
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
POOR ENTRANCE CONDITIONS
CHECK
VALVE
REDUCER HORIZONTAL
RECOMMENDED ENTRANCE CONDITIONS
ECCENTRIC
REDUCER
to avoid creating air pockets. Valves are not nor mally used in suction lines, but if a valve is used, install it with the stem horizontal to avoid air pock ets.
Refer to Figure 2 for the recommended entrance conditions using fittings.
GATE
VALVE
ELBOW
3 TO 4 DIA'S OF STRAIGHT PIPE
GATE
VALVE
3 TO 4 DIA'S OF STRAIGHT PIPE
Figure 2. Entrance Conditions Using Fittings
Strainers
A suction strainer was not furnished with this pump since it is not designed to handle liquids containing solids. However, to protect the pump from acciden tal damage a commercially available 80 mesh screen should be installed in the suction line. Make certain that the total open area of the screen is at least three or four times the cross section of the suction line to ensure an adequate supply of liquid to the pump.
Damage to the pump resulting from debris in the suction line will not be covered by the pump warranty. Before connecting the
HORIZONTAL
ELBOW
suction and discharge piping, carefully check the storage tank and piping for con struction debris such as nuts, bolts, wire, weld slag, and other foreign material. In stall a commercially available 80 mesh screen and a filter in the suction line to pre vent debris from entering the pump.
Sealing
Since even a slight leak will affect priming, head, and capacity, especially when operating with a high suction lift, all connections in the suction line should be sealed with pipe dope to ensure an air tight seal. Follow the sealant manufacturer's rec ommendations when selecting and applying the pipe dope. The pipe dope should be compatible with the liquid being pumped.
PAGE B - 4 INSTALLATION
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OM-03989 RS AND RD SERIES PUMPS
Suction Lines In Sumps
If a single suction line is installed in a sump, it should be positioned away from the wall of the sump at a distance equal to 1 1/2 times the diame ter of the suction line.
If there is a liquid flow from an open pipe into the sump, the flow should be kept away from the suc tion inlet because the inflow will carry air down into the sump, and air entering the suction line will re duce pump efficiency.
If it is necessary to position inflow close to the suc tion inlet, install a baffle between the inflow and the suction inlet at a distance 1 1/2 times the diameter of the suction pipe. The baffle will allow entrained air to escape from the liquid before it is drawn into the suction inlet.
If two suction lines are installed in a single sump, the flow paths may interact, reducing the efficiency
of one or both pumps. To avoid this, position the suction inlets so that they are separated by a dis tance equal to at least 3 times the diameter of the suction pipe.
Suction Line Positioning
The depth of submergence of the suction line is critical to efficient pump operation. Figure 3 shows
recommended minimum submergence vs. veloc ity.
NOTE
The pipe submergence required may be reduced by installing a standard pipe increaser fitting at the end of the suction line. The larger opening size will reduce the inlet velocity. Calculate the required submergence using the following formula based on the increased opening size (area or diameter).
Figure 3. Recommended Minimum Suction Line Submergence vs. Velocity
PAGE B - 5INSTALLATION
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RS AND RD SERIES PUMPS OM-03989
DISCHARGE LINES
Siphoning
Do not terminate the discharge line at a level lower than that of the liquid being pumped unless a si phon breaker is used in the line. Otherwise, a si phoning action causing damage to the pump could result.
Valves
Some pump models are provided with an integral priming pump check valve in the discharge port. This check valve is designed to prevent recircula tion of air or vapor ejected during the priming cycle. It will not serve as a discharge check valve in the system piping. If the application involves static dis charge head or suction pressures, a check valve must be installed to prevent siphoning or loss of prime through the bypass line. If a system check valve is required, it must be installed in addition to the built‐in priming pump check valve.
The Air Release Valve works in conjunction with the integral priming pump to expel and prevent recir culation of air or vapor ejected during the priming cycle. The Air Release Valve will not serve as a throttling valve or check valve in the system piping. If the application involves static discharge head or suction pressure, system check valve must be in stalled to prevent siphoning or loss of prime through the pump.
If a throttling valve is desired in the discharge line, use a valve as large as the largest pipe to minimize friction losses. Never install a throttling valve in a suction line.
With high discharge heads, it is recommended that a throttling valve and a system check valve be in stalled in the discharge line to protect the pump from excessive shock pressure and reverse rota tion when it is stopped.
Priming Lines
The integral Roto‐Prime priming pump incorpo rates a priming line which evacuates the suction line effectively against back pressure ranging from atmospheric pressure up to approximately 8 psi (measured downstream of the discharge check valve). If static discharge pressure exceeds 8 psi, an Air Release Valve must be installed to permit the escape of air or vapor to atmosphere during initial priming or repriming cycle. This valve functions in conjunction with three priming tubes installed be tween the Air Release Valve, the priming pump and the pump suction.
Air Release Valves (“BAR” Models)
Some pump models are provided with an Air Re lease Valve. If the pump does not have an Air Re lease Valve, it can be ordered as optional equip ment. Since internal changes are required on the pump to facilitate installation and proper function of the Air Release Valve, it is recommended that this be ordered as a factory installed option only.
If the application involves a high discharge head, gradually close the discharge throttling valve before stopping the pump.
Air Release Valve Venting (“BAR” Models)
When ordered as a factory installed option, the Air Release Valve is shipped mounted on the pump base with the valve tubing connected. If the Air Re lease Valve is shipped separately, refer to the in stallation instructions accompanying the Valve.
Remove the shipping plug in the head of the Air Re lease Valve so that normal operation and venting can take place. It is suggested that a length of 3/4 inch tubing be installed in the shipping plug open ing so that hazardous vapors can be carried away from the immediate vicinity of the pump.
NOTE
When two pumps equipped with Air Release Valves are installed in parallel, a check valve must be in stalled in the venting lines.
PAGE B - 6 INSTALLATION
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OM-03989 RS AND RD SERIES PUMPS
If the pump is installed within a closed building such as a pump house, venting lines to the outside of the building should be installed in accordance with National and local codes.
Bypass Lines (“BAR” Models)
The integral Roto‐Prime priming pump and Air Release Valve work in conjunction with three tube assemblies. One tube assembly draws vapor from the suction flange of the centrifugal pump to the suction port of the priming pump. Another assem bly discharges the vapor to the air release. The third tube assembly returns any accumulated liq uid from the bottom of the cylindrical air release chamber back into the suction flange of the cen trifugal pump.
ALIGNMENT
The alignment of the pump and its power source is critical for trouble‐free mechanical operation. In either a flexible coupling or V‐belt driven system, the driver and pump must be mounted so that their shafts are aligned with and parallel to each other. It is imperative that alignment be checked after the pump and piping are installed, and before opera tion.
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. Most couplings require a specific gap or clearance between the driving and the driven shafts. Refer to the coupling manufacturer's service literature.
Align spider insert type couplings by using calipers to measure the dimensions on the circumference of the outer ends of the coupling hub every 90 de grees. The coupling is in alignment when the hub ends are the same distance apart at all points (see Figure 4).
NOTE
Check Rotation, Section C, before final alignment of the pump.
When mounted at the Gorman‐Rupp factory, driver and pump are aligned before shipment. Misalign ment will occur in transit and handling. Pumps must be checked and realigned before operation. Before checking alignment, tighten the foundation bolts. The pump casing feet and/or pedestal feet, and the driver mounting bolts should also be tightly secured.
Figure 4. Aligning Spider‐Type Couplings
Align non‐spider type couplings by using a feeler gauge or taper gauge between the coupling halves every 90 degrees. The coupling is in alignment when the hubs are the same distance apart at all points (see Figure 5).
Check parallel adjustment by laying a straightedge across both coupling rims at the top, bottom, and
PAGE B - 7INSTALLATION
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RS AND RD SERIES PUMPS OM-03989
side. When the straightedge rests evenly on both halves of the coupling, the coupling is in horizontal parallel alignment. If the coupling is misaligned, use a feeler gauge between the coupling and the straightedge to measure the amount of misalign ment.
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.
Figure 5. Aligning Non‐Spider Type Couplings
PAGE B - 8 INSTALLATION
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OM-03989 RS AND RD SERIES PUMPS

OPERATION - SECTION C

GENERAL INFORMATION
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and decals attached to the pump.
This pump is designed to handle petro leum products or other similar hydro carbon liquids. Do not attempt to pump
water, corrosive materials, or any liq uids which may damage the pump or en danger personnel as a result of pump failure.
This pump is not designed to handle water. Operation of the pump with water or water‐ based solutions will damage the group grind within the vane‐type priming pump. Do not connect this pump to a storage tank which has been filled with water until the tank and lines have been completely drained and flushed. Install a commercially available 80 mesh screen and a filter in the suction line to prevent debris from entering the pump. Check pump rotation with the suction line disconnected.
Pump speed and operating condition points must be within the continuous per formance range shown on the curve (see the Parts List Manual, Page 1).
PRIMING
Install the pump and piping as described in IN STALLATION. Make sure that the piping connec
tions are tight, and that the pump is securely mounted. Check that the pump is properly lubri cated (see LUBRICATION in MAINTENANCE AND REPAIR).
Never operate this pump unless there is liquid in the pump casing. The pump will not prime when dry. Extended operation of a dry pump will destroy the seal assembly.
If the pump is installed within a closed building such as a pump house, venting lines to the outside of the building should be installed in accordance with National and local codes.
Priming Pump
Before starting the pump for the first time, carefully remove the spring cap, gasket and pressure regu lating spring located in the top of the group grind (see the parts list for identification). Pour approxi mately 4 ounces (0,12 liter) of SAE 10 or 20 non‐de tergent oil into the group grind to lubricate the shaft seal and group grind rotor blades. Reinstall the spring, gasket and cap.
Before attempting to start the motor, rotate the pump shaft by hand to ensure the oil is evenly dis tributed within the group grind. If the shaft does not rotate by hand, allow the pump to sit to absorb the lubricating oil and then rotate the shaft again. Do not start the pump motor until the shaft has been rotated by hand.
Whenever air or vapor is present in the suction line, whether at start‐up or during pumping operation,
PAGE C - 1OPERATION
Page 16
RS AND RD SERIES PUMPS OM-03989
the spring located on top of the rotor forces the group grind into its maximum eccentric position to automatically evacuate the air vapor through the priming tube and into the pump discharge.
When the pump is installed under unusual conditions, the priming tube(s) may vi brate abnormally. If this occurs after the pump and piping are properly secured, contact the factory to obtain optional springs for the priming pump group grind. If vibration is not corrected, the tubing
could fatigue and spill the liquid being pumped, resulting in a fire hazard.
As air and vapor is evacuated and the main cen trifugal pump begins to deliver liquid, the resulting priming pump discharge pressure builds up against the underside of the slide and moves it to ward the neutral (centered) position. After all the air and vapor is removed and the centrifugal pump reaches full capacity, the priming pump discharge pressure overcomes the spring pressure on the slide and moves it towards the neutral position where it remains until air or vapor enters the sys tem. While in the neutral position, the priming pump operates at minimum capacity and circu lates only a small amount of liquid. See Figure 2 for the theory of priming pump operation.
FULL PRIMING
(SPRING FULLY EXTENDED,
SLIDE AT BOTTOM, MAXI
MUM VAPOR EVACUATION)
Priming is rapid, but not instantaneous. The prim ing pump will prime an absolutely dry line of four inch diameter in approximately two seconds per foot of suction pipe. Thus, if the suction line is 10 feet long, the pump will prime in approximately 20 seconds. If the pump continually handles dry liq uids, such as gasoline or solvents, priming pump vane wear may result, causing a loss of priming vacuum. If priming time increases significantly over a period of time, check the priming pump vanes for excessive wear.
(SPRING SLIGHTLY COMPRESSED,
SLIDE MOVING TOWARD CENTER,
Figure 2. Automatic Priming Sequence
NOTE
A special seal is available for pumps which are to
PAGE C - 2 OPERATION
PARTIAL PRIMING
VAPOR MOSTLY EVACUATED)
handle solvents. When ordering a pump or replace ment parts, specify what solvent the pump is to han dle.
Priming Pump Group Grind Check
With the pump inoperative, remove the group grind drain plug and drain any liquid from the group grind. Remove the spring cap and pressure regulating spring. Insert a screwdriver or other suit able tool into the drain plug hole, and move the slide up and down. The slide should travel 1/8 inch (3,2 mm) from the full priming position to the neu
NEUTRAL
(SPRING FULLY COM
PRESSED, SLIDE CENTERED,
VAPOR FULLY EVACUATED)
Page 17
OM-03989 RS AND RD SERIES PUMPS
tral position. If it does not, flush the group grind with penetrating oil, and check the slide travel again. The slide should move freely. Reinstall the pressure regulating spring and spring cap, and clean and reinstall the drain plug.
Air Release Valve (“BAR” Models)
When properly installed, the Air Release Valve al
AIR RELEASE
VALVE
lows the integral Roto‐Prime priming pump to overcome relatively high static discharge heads or back pressure during the priming cycle. Figure 1 shows a schematic configuration of the valve and is keyed to the following description of operation.
VENT TO OUTSIDE IF INSTALLED IN
PUMP HOUSE (CHECK VALVE REQUIRED
ON DUPLEX INSTALLATION ONLY)
DISCHARGE LINE CHECK
VALVE (MANDATORY)
D
DISCHARGE
B
C
E
Figure 1. Gorman-Rupp Air Release Valve Connected To Roto-Prime Pump
The Air Release Valve is designed with an air valve in the head of the assembly and a sump valve in the base of the assembly. These valves are controlled by a common rod which is moved vertically by an attached float.
When the pump is first installed, there is air in the suction line, the Air Release Valve is open, and there is back pressure against the discharge line check valve “D”.
When the pump is started, air is drawn from the suction line into the priming pump through the priming tube “A”, compressed by the priming
A
GORMAN‐RUPP ROTO‐PRIME
SELF‐PRIMING CENTRIFUGAL PUMP
pump, and discharged through the discharge tube “B” to the Air Release Valve. This air and vapor is then vented to the atmosphere through the valve head.
With the float down, sump valve “E” is closed; air cannot re‐enter the suction piping through the re turn tube assembly “C”.
As product fills the pump casing, the impeller de velops pressure, opening check valve “D” in the discharge piping. The priming pump will deliver product, filling the float chamber. The float will rise, opening sump valve “E”, and closing the air valve.
SUCTION
PAGE C - 3OPERATION
Page 18
RS AND RD SERIES PUMPS OM-03989
The product recirculates through the return tube assembly “C” to the pump suction flange. The liq uid pressure equalizes the priming pump spring pressure and the priming pump slides into neutral. At this point the pump is fully primed.
In neutral position the priming pump circulates a small amount of liquid through the discharge tube to the float chamber through the return tube and back into the suction flange.
If air or vapor enters the suction piping during the pumping operation, again the discharge line check valve will close, and the priming pump will again evacuate the air through the Air Release Valve.
STARTING
Consult the operations manual furnished with the power source.
Before connecting a motor to the incoming power, check that the electrical service available matches the pump motor requirements stamped on the mo tor nameplate. Check that the motor speed meets pump specifications. The pump is designed to be driven at a maximum full load speed of either 1750 RPM (RS Series) or 3450 RPM (RD Series).
Rotation
observing the direction of the motor shaft, or cool ing fan.
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 lit erature supplied with the motor for specific instruc tions.
OPERATION
Leakage
No leakage should be visible at pump mating sur faces, or at pump connections or fittings. Keep all line connections and fittings tight to maintain maxi mum pump efficiency.
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is 160F (71C). Do not apply it at a higher operating temperature.
Overheating can occur if operated with the valves in the suction or discharge lines closed. Operating against closed valves could bring the liquid to a boil, build pressure, and cause the pump to rup ture or explode. If overheating occurs, stop the pump and allow it to cool before servicing it. Refill the pump casing with cool liquid.
The correct direction of pump rotation is indicated by an arrow on the pump body or accompanying decals. The pump could be damaged and per formance adversely affected by incorrect rotation. If pump performance is not within the specified lim its (see the curve in the Parts List Manual on page
1), check the direction of rotation before further troubleshooting.
Consult the operating manual furnished with the power source before attempting to start the power source.
If an electric motor is used to drive the pump, re move V‐belts, couplings, or otherwise disconnect the pump from the motor before checking motor rotation. Operate the motor independently while
PAGE C - 4 OPERATION
Allow an over‐heated pump to com pletely cool before servicing. Do not re move plates, covers, gauges, or fittings from an over‐heated pump. Liquid with in the pump can reach boiling tempera tures, and vapor pressure within the pump can cause parts being disen gaged to be ejected with great force. Af 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.
Page 19
OM-03989 RS AND RD SERIES PUMPS
Strainer Check
A suction strainer was not furnished with this pump but an 80 mesh screen may have been installed by the user. Check the screen regularly, and clean it as necessary. The screen should also be checked if pump flow rate begins to drop. If a vacuum suc tion gauge has been installed, monitor and record the readings regularly to detect screen blockage.
If the application involves a high discharge head, gradually close the discharge throttling valve before stopping the pump.
After stopping the pump, shut off the incoming power and lock it out, or take other action to ensure that the pump will remain inoperative.
Pump Vacuum Check
NOTE
Petroleum products are very sensitive to changes in temperature. Warmer temperatures elevate the product vapor pressure resulting in low vacuum readings. Do not mistake temperature problems for faulty pump installation or performance.
With the pump inoperative, install a vacuum gauge in the system, using pipe dope on the threads. Block the suction line and start the pump. At oper ating speed the pump should pull a vacuum of 15 to 17 inches (381 to 432 mm) or more of mercury for petroleum. If it does not, check for air leaks in the seal, gasket, or discharge valve.
Open the suction line, and read the vacuum gauge with the pump primed and at operation speed. Shut off the pump. The vacuum gauge reading will immediately drop proportionate to static suction lift, and should then stabilize. If the vacuum reading falls off rapidly after stabilization, an air leak exists. Before checking for the source of the leak, check the point of installation of the vacuum gauge.
STOPPING
Cold Weather Preservation
Since the application of this pump is limited to pe troleum products, normal freezing conditions will not damage the pump. However, during extremely severe conditions care should be exercised during start‐up, especially if the pump has been idle for more than a few hours.
BEARING TEMPERATURE CHECK
The standard bearings used in this pump are per manently sealed and lubricated by the manufac turer. However due to temperature changes and the danger of moisture contamination, the bearing cavity is also partially filled with grease.
Optional oil lubricated bearings are not fully sealed, and oil is required within the bearing hous ing to lubricate them and protect them from mois ture condensation.
Monitor the condition of the bearing lubri cant regularly for evidence of rust or mois ture condensation. This is especially im portant in areas where variable hot and cold temperatures are common.
Never halt the flow of liquid suddenly. If the liquid being pumped is stopped abruptly, damaging shock waves can be transmitted to the pump and piping system. Close all connecting valves slowly.
Bearings normally run at higher than ambient tem peratures because of heat generated by friction. Temperatures up to 160F (71C)are considered normal for bearings, and they can operate safely to at least 180F(82C).
PAGE C - 5OPERATION
Page 20
RS AND RD SERIES PUMPS OM-03989
Checking bearing temperatures by hand is inaccu rate. Bearing temperatures can be measured ac curately by placing a contact‐type thermometer against the housing. Record this temperature for future reference.
A sudden increase in bearing temperatures is a warning that the bearings are at the point of failing to operate properly. Make certain that the bearing
lubricant is of the proper viscosity and at the cor rect level (see LUBRICATION in Section E). Bear ing overheating can also be caused by shaft misalignment and/or excessive vibration.
When pumps are first started, the bearings may seem to run at temperatures above normal. Con tinued operation should bring the temperatures down to normal levels.
PAGE C - 6 OPERATION
Page 21
For U.S. and International Warranty Information,
Please Visit www.grpumps.com/warranty
or call:
U.S.: 419-755-1280
International: +1-419-755-1352
For Canadian Warranty Information,
Please Visit www.grcanada.com/warranty
or call:
519-631-2870
THE GORMAN‐RUPP COMPANY MANSFIELD, OHIO
GORMAN‐RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA
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