ACDE |
OM 00632 03 |
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March 26, 1980 |
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Rev. F 12 05 2013 |
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INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
10 SERIES PUMP
MODEL
13A20-B
THE GORMAN RUPP COMPANY D MANSFIELD, OHIO
www.grpumps.com
GORMAN RUPP OF CANADA LIMITED D ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
e1980 The Gorman Rupp Company
Register your new
Gorman Rupp pump online at
www.grpumps.com/register.
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:
TABLE OF CONTENTS |
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INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE I - 1 |
SAFETY SECTION A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE A - 1 |
INSTALLATION - SECTION B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 1 |
Pump Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 1 |
PREINSTALLATION INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 2 |
POSITIONING PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 2 |
Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 2 |
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 2 |
Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
SUCTION AND DISCHARGE PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
Line Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
Connections to Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
SUCTION LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
Strainers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 3 |
Suction Lines In Sumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 4 |
Suction Line Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 4 |
DISCHARGE LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 4 |
Siphoning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 5 |
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 5 |
Bypass Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 5 |
AUTOMATIC AIR RELEASE VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 6 |
Air Release Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B -6 |
ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 7 |
Coupled Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 8 |
V Belt Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 8 |
V BELT TENSIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 9 |
General Rules of Tensioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 9 |
Tension Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE B - 9 |
OPERATION - SECTION C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 1 |
PRIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 1 |
STARTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 1 |
Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 1 |
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 2 |
Lines With a Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 2 |
Lines Without a Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 2 |
Leakage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 2 |
Liquid Temperature And Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 2 |
Strainer Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 2 |
Pump Vacuum Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 2 |
STOPPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 3 |
BEARING TEMPERATURE CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 3 |
Cold Weather Preservation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE C - 3 |
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TABLE OF CONTENTS (continued)
TROUBLESHOOTING - SECTION D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE D - 1 |
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE D - 3 |
PUMP MAINTENANCE AND REPAIR SECTION E . . . . . . . . . . . . . . . . . |
PAGE E - 1 |
STANDARD PERFORMANCE CURVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 1 |
PARTS LIST: |
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Pump Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 3 |
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 4 |
Suction Check Valve Removal and Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 4 |
Back Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 4 |
Pump Casing Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 5 |
Impeller Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 5 |
Seal Removal and Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 5 |
Shaft and Bearing Removal and Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 6 |
Shaft and Bearing Reassembly and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 7 |
Seal Reassembly and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 8 |
Impeller Installation And Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 10 |
Pump Casing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 10 |
Back Cover Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 10 |
Suction Check Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 10 |
Final Pump Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 10 |
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 11 |
Seal Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 11 |
Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 11 |
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
PAGE E - 11 |
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10 SERIES |
OM-00632 |
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INTRODUCTION
Thank You for purchasing a Gorman Rupp 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.
This pump is a 10 Series, semi open impeller, self priming centrifugal model with a suction check valve. The pump is designed for handling most non volatile, non flammable liquids containing specified entrained solids. The basic material of construction for wetted parts is cast iron, with duc tile iron impeller.
This manual will alert personnel to known proce dures which require special attention, to those which could damage equipment, and to those which could be dangerous to personnel. However, this manual cannot possibly anticipate and provide detailed precautions for every situation that might occur during maintenance of the unit. Therefore, it is the responsibility of the owner/maintenance per sonnel to ensure that only safe, established main tenance procedures are used, and that any proce dures not addressed in this manual are performed only after establishing that neither personal safety nor pump integrity are compromised by such prac tices.
For information or technical assistance on the pow er source, contact the power source manufactur er's local dealer or representative.
If there are any questions regarding the pump or its application which are not covered in this man ual or in other literature accompanying this 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
The following are used to alert maintenance per sonnel to procedures which require special atten tion, 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.
Hazards or unsafe practices which 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.
Hazards or unsafe practices which COULD result in minor personal injury or product or property damage. These instructions describe the requirements and the possi ble damage which could result from failure to follow the procedure.
NOTE
Instructions to aid in installation, operation, and maintenance or which clarify a procedure.
INTRODUCTION |
PAGE I - 1 |
10 SERIES |
OM-00632 |
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SAFETY SECTION A
This information applies to 10 Series ba sic pumps. Gorman Rupp has no con trol over or particular knowledge of the power source which will be used. Refer to the manual accompanying the power source before attempting to begin oper ation.
This manual will alert personnel to known procedures which require spe cial attention, to those which could damage equipment, and to those which could be dangerous to personnel. How ever, this manual cannot possibly antici pate and provide detailed instructions and precautions for every situation that might occur during maintenance of the unit. Therefore, it is the responsibility of the owner/maintenance personnel to ensure that only safe, established main tenance procedures are used, and that any procedures not addressed in this manual are performed only after estab lishing that neither personal safety nor pump integrity are compromised by such practices.
Before attempting to open or service the pump:
1.Familiarize yourself with this man ual.
2.Disconnect or lock out the power source to ensure that the pump will remain inoperative.
3.Allow the pump to completely cool if overheated.
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 most non volatile, non flammable liquids containing specified entrained solids. Do not attempt to pump volatile or flam mable liquids which may damage the pump or endanger personnel as a result of pump failure.
Death or serious personal injury and damage to the pump or components can occur if proper lifting procedures are not observed. Make certain that hoists, chains, slings or cables are in good working condition and of suffi cient capacity and that they are posi tioned so that loads will be balanced and the pump or components will not be damaged when lifting. Suction and dis charge hoses and piping must be re moved from the pump before lifting. Lift the pump or component only as high as necessary and keep personnel away from suspended objects.
After the pump has been installed, make certain that the pump and all piping or hose connections are tight, properly supported and secure before operation.
SAFETY |
PAGE A - 1 |
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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.
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 completely cool before servicing.
Overheated pumps can cause severe burns and injuries. 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.
6.Refer to instructions in this manual before restarting the pump.
Do not operate the pump without shields and/or guards in place over the drive shafts, belts, and/or couplings, or other rotating parts. Exposed rotating parts can catch clothing, fingers, or tools, causing severe injury to person nel.
Never run this pump backwards. Be cer tain that rotation is correct before fully engaging the pump.
Pumps and related equipment must be in stalled and operated according to all na tional, local and industry standards.
PAGE A - 2 |
SAFETY |
10 SERIES |
OM-00632 |
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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.
If installed in a flooded suction application where the liquid is supplied to the pump under pressure, some of the information such as mounting, line configuration, and priming must be tailored to the
specific application. Since the pressure supplied to the pump is critical to performance and safety, be sure to limit the incoming pressure to 50% of the maximum permissible operating pressure as shown on the pump performance curve (see Sec tion E, Page 1).
For further assistance, contact your Gorman Rupp distributor or the Gorman Rupp Company.
Pump Dimensions
See Figure B-1 for the approximate physical di mensions of this pump.
OUTLINE DRAWING
Figure B-1. Pump Model 13A20-B
INSTALLATION |
PAGE B - 1 |
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PREINSTALLATION INSPECTION |
POSITIONING PUMP |
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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 that the pump shaft rotates in the required direction.
Only operate this pump in the direction in dicated by the arrow on the pump body and on the accompanying decal. Other wise, the impeller could become loosened from the shaft and seriously damage the pump.
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 has been stored for more than 12 months, some of the components or lubri cants may have exceeded their maximum shelf life. These must be inspected or re placed to ensure maximum pump service.
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.
Death or serious personal injury and damage to the pump or components can occur if proper lifting procedures are not observed. Make certain that hoists, chains, slings or cables are in good working condition and of suffi cient capacity and that they are posi tioned so that loads will be balanced and the pump or components will not be damaged when lifting. Suction and dis charge hoses and piping must be re moved from the pump before lifting. Lift the pump or component only as high as necessary and keep personnel away from suspended objects.
Lifting
Pump unit weights will vary depending on the mounting and drive provided. Check the shipping tag on the unit packaging for the actual weight, and use lifting equipment with appropriate capacity.
Drain the pump and remove all customer installed equipment such as suction and discharge hoses or piping before attempting to lift existing, installed units.
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.
Clearance
It is recommended that 18 inches (457 mm) of clearance be provided in front of the back cover to permit removal of the cover and easy access to the pump interior. A minimum clearance of 6 inches (152,4 mm) must be maintained to permit removal of the cover.
PAGE B - 2 |
INSTALLATION |
10 SERIES |
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SUCTION AND DISCHARGE PIPING
Pump performance is adversely effected by in creased suction lift, discharge elevation, and fric tion losses. See the performance curve on Page
E 1 to be sure your overall application allows pump to operate within the safe operation range.
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, 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.
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. 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.
Strainers
If a strainer is furnished with the pump, be certain to use it; any spherical solids which pass through a strainer furnished with the pump will also pass through the pump itself.
If a strainer is not furnished with the pump, but is installed by the pump user, make certain that the total area of the openings in the strainer is at least three or four times the cross section of the suction line, and that the openings will not permit passage of solids larger than the solids handling capability of the pump.
This pump is designed to handle up to 1 1/2 inch
(38,1 mm) diameter spherical solids.
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.
INSTALLATION |
PAGE B - 3 |
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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 B-2 shows recommended minimum submergence vs. velocity.
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 B-2. Recommended Minimum Suction Line Submergence vs. Velocity
PAGE B - 4 |
INSTALLATION |
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