Graham Corporation Liquid Ring Pump 2 Series Instruction manual
Graham Corporation
Table of Contents
Section 1 - General Information ................................................................................................... 3
1.1 Introduction...................................................................................................................................... 3
1.2 General Description and Principle of Operation..............................................................................4
1.3 Description of Pump Model Codes .................................................................................................. 5
Section 2 - Installation Instructions .............................................................................................. 6
2.1 Handling........................................................................................................................................... 6
2.2 Preservation...................................................................................................................................... 6
2.3 Mounting.......................................................................................................................................... 6
2.4 Installation........................................................................................................................................ 6
2.5 Coupling Alignment......................................................................................................................... 7
2.6 Belt Drives ....................................................................................................................................... 8
2.7 Service Liquid Piping Arrangements ............................................................................................... 8
2.8 Shaft Seal Coolant Piping Arrangement ........................................................................................ 11
2.9 Piping Requirements ...................................................................................................................... 11
2.10 Electrical Requirements ............................................................................................................... 12
Section 3 - Operating Instructions .............................................................................................. 12
3.1 Start-up Procedures ........................................................................................................................ 12
3.2 Pump Packing Adjustment............................................................................................................. 13
3.3 Service Liquid Requirements......................................................................................................... 14
3.4 Cavitation ....................................................................................................................................... 15
3.5 Shut-Down Procedure .................................................................................................................... 16
Section 4 - Accessory Items........................................................................................................ 16
4.1 Accessories..................................................................................................................................... 16
Section 5 - Maintenance.............................................................................................................. 19
5.1 Performance ................................................................................................................................... 19
5.2 Pump Estimated Weights ............................................................................................................... 19
5.3 Shaft Bearings ................................................................................................................................ 19
5.4 Gland Packings .............................................................................................................................. 19
5.5 Mechanical Seals............................................................................................................................ 19
5.6 Storage ........................................................................................................................................... 20
5.7 Removal from storage.................................................................................................................... 20
5.8 Troubleshooting Chart ................................................................................................................... 21
Section 6 - Rebuild Instructions.................................................................................................. 22
6.1 General ........................................................................................................................................... 22
6.2 Impeller End Clearances ................................................................................................................ 22
6.3 Tie Rod Torque Values .................................................................................................................. 24
6.4 Bearing Data .................................................................................................................................. 24
Section 7 - Warranty ................................................................................................................... 25
Appendix A- Material Safety Data Sheets.................................................................................. 26
Appendix B- Return Material Authorization Form .................................................................... 29
Appendix C- Pump Information ................................................................................................. 30
Appendix D- Pump Weights....................................................................................................... 31
Graham Corporation
3
Section 1 - General Information
1.1 Introduction
This manual will provide assistance in the installation, operation, and maintenance of your
Graham Liquid Ring Pump. Please read this manual completely prior to operating your Liquid
Ring Pump. If you need to contact the Pump Service Department for assistance, please have
available the pump serial number and model number. The Pump Service Department may be
reached by contacting Graham Corporation in Batavia, NY by phone (585) 343-2216, Fax (585)
343-1097, or e-mail at service@graham-mfg.com. Refer to the Graham web site at
www.graham-mfg.com for other information on our Liquid Ring Pumps.
Graham has an extensive stock of spare parts and replacement pumps. Stocked parts and pumps
can be shipped from our warehouse in Batavia, NY by a carrier of your choice.
For your convenience, use our toll free number (1-800-828-8150) only when ordering spare parts
and replacement pumps. Please have the model number, serial number and part number of the
items required when placing an order. Refer to Graham web site www.graham-mfg.com for
Liquid Ring Vacuum Pump spare parts information. Normal business hours are 8:00 a.m. to 5:00
p.m. (E.S.T.), Monday through Friday.
Factory rebuilding service is available for pumps returned to our factory in Batavia, New York.
Before a pump is returned to the factory for repairs, please drain and flush the pump and include
a Material Safety Data Sheet (MSDS) for the process in which the pump was used. A Return
Material Authorization (RMA) Number, issued by Graham, is required before returning a pump.
Refer to our web site for this form or contact Graham for this information. Field Service
Technicians are also available for travel to the jobsite for troubleshooting and repair or
rebuilding of pumps. Contact Graham for service rates.
This document and the information contained herein are the property of Graham Corporation and
must not be copied, in whole or in part, nor used for manufacture or otherwise disclosed without
the prior written consent of the company. Information contained herein may, from time to time,
be revised and/or updated.
Copyright Graham Corporation 2006
Graham Corporation
4
1.2 General Description and Principle of Operation
Graham Vacuum Pumps and Compressors are of the liquid ring type. Single and two stage
pumps are available in a wide range of sizes and materials. These options are listed in the
Graham Sales Bulletin available on our web site. The major component of the Graham pump is a
multi-bladed rotating assembly positioned eccentrically in a cylindrical casing. (See Figure 1)
This assembly is driven by an external source, normally an electric motor. Service liquid
(usually water) is introduced into the pump. As the impeller rotates, centrifugal force creates a
liquid ring which is concentric to the casing. At the inlet, the area between the impeller blades
(buckets) increases in size, drawing gas in. As the impeller continues to rotate toward the
discharge, the impeller bucket area decreases in size, compressing the gas. This gas, along with
the liquid from the pump, is discharged through the outlet nozzle. The service liquid is separated
from the gas and cooled for reuse in the pump or sent to a drain. In addition to being the
compressing medium, the liquid ring performs two other important functions:
1) It absorbs the heat generated by compression, friction, and condensation of
the incoming vapor.
2) It absorbs and washes out any process contaminants entrained in the gas.
A continuous supply of service liquid is necessary to limit the temperature rise in the pump
caused by the heat of compression, friction, and condensation. Any excessive rise in
temperature will have a detrimental effect on performance, reducing the capacity and degree of
vacuum attainable. Installation schematics for the supply of the service liquid and for the
separation of the gas and liquid discharged from the pump are shown in Section 2.
FIGURE 1
Shaft
Suction Port
Impeller
Gas
Dischar
g
e Port
Li
q
uid Rin
g
Gas and
Li
q
uid Outlet
Gas
Inlet
Rotation
Graham Corporation
5
Service liquid quantities are a function of the particular model and the intended application.
Check the data sheet for your specific pump model or see Table 1 of Section 3 which lists typical
service liquid requirements for Graham Model Pumps.
The normal operating ranges of Liquid Ring Pumps when using water at 59 ºF
(15 ºC) for the service liquid are:
Single Stage Pumps dependent on model, down to 25 mmHgA
Two Stage Pumps down to 25 mmHgA
Two Stage Pumps w/Air Ejector down to 3 mmHgA
Single Stage Compressors 20 psi (1.4 bar) max. differential
Two Stage Compressors 30 psi (2.1 bar) max. differential
The standard materials of construction are suitable for handling air and other non-corrosive
gases, while using water as the service liquid. Other materials can be supplied for special
applications.
1.3 Description of Pump Model Codes
Each pump is designated by a model code which describes the materials of construction, size,
type of shaft seals, and any special features. An example of a typical pump is shown below.
Note: Graham Pump Models LXP30 & LXP55 are replacements for models 2PV31020 and
2PV31040 respectively.
Number of Stages
Frame Size
Series 2 Design
Size
C-faced mounting option
(not available on all models)
2 PV 42120 / 10 / DD / L
Design CodeVacuum Pump = PV Material
C
ode
Table of contents
