Graham Corporation
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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.
The normal operating ranges of Liquid Ring Pumps when using water at 59º F
(15 ºC) for the service liquid are:
Single Stage Pumps down to 150 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.
Contact Graham for a complete listing of the codes used to describe the pump.
Number of Stages
Frame Size
Pump Series
Impeller Size
Shaft Seal Code
Special Features
2 PV 42120 / 12 / 43 / I / D
Pump
Material
Code
Vacuum Pump = PV
Compressor = PC
Connection
and Shaft
End Type
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