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DESCRIPTION OF EQUIPMENT
The AA3G Series pumps are positive displacement, rotary screw pumps consisting of a precision bored
housing that encloses a drive screw (power rotor) and two intermeshing driven screws (idler rotors). These
screws, when rotating, form a succession of closures or cavities. As they rotate, fluid is moved axially from
inlet to outlet port in a continuous, uniform flow with minimum fluid pulsation and pump noise.
ORDERING INSTRUCTIONS
To order replacement pump or parts, contact an Imo sales office or representative with pump model number,
serial number and part IDP number. This information can be found on pump nameplate and in this manual
.
OPERATION
LIQUID LIMITATIONS
Never operate on water. Pump is designed for liquids having general characteristics of lubricating oil
or distillate fuel oils.
OPERATING LIMITS
CAUTION
ATTENTION
Operating conditions, such as speed, fluid viscosity, temperature inlet pressure, discharge
pressure, filtration, duty cycle, drive type, mounting, etc., are interrelated. Due to these
variable conditions, specific application limits may be different from operational
limitations. This equipment must not be operated without verifying system’s operating
requirements are within pump’s capabilities.
Under no circumstances are operating and structural limits (specified in Table 1) to be exceeded
without specific approval from Imo Pump.
Table 1.
Pump Operating and Structural Limits
MAXIMUM SPEED:
4000 RPM for 187/200 models and 3600 RPM for 250 models.
VISCOSITY:
15000 SSU (3200 cSt) Max./ 1500 SSU (325 cst) Max. for Relief Valve models.
2.0 cst Minimum For All Models
NOTE:
Consult factory for allowable operating viscosity at specific speeds and pressures.
DO NOT
alter design viscosity without prior consultation with Imo Pump.
TEMPERATURE: ………………..…………………….
0
to 225
F (-18
to 107
C).
INLET PRESSURE: …………………………..………..
50 psig (3.4 Bar) Max.
DIFFERENTIAL PRESSURE: . ………………………
250 psig (17.2 Bar) Max.
DISCHARGE PRESSURE: ………………..…………..
300 psi (20.7 Bar) Max.
DRIVE: ……………………………………………..……
Direct Drive only.
FILTRATION: …………..……………………………..
See General Installation Manual, CA-1
MOUNTING: ……………….………...…………….…..
Foot or Flange Mounted.
SHAFT ROTATION: …………………….…………….
Available in CW or CCW versions. Pump is
NOT
bi-rotational.
