IMO 3215/525, Instruction Manual And Parts List, Page: 3 / 11

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A. GENERAL INSTRUCTIONS
The instructions found herein cover the disassembly, assembly and parts identification of
D12DZ-250 pumps.
NOTE: Individual contracts may have specific provisions that vary from this manual. Should
any questions arise which may not be answered by these instructions, refer to General
Instructions Manual, CA-1, provided with your order. For further detailed information
and technical assistance please refer to Imo Pump, Technical/Customer Service
Department, at (704) 289-6511.
This manual cannot possibly cover every situation connected with the installation, operation, inspection,
and maintenance of equipment supplied. Every effort was made to prepare the manual text so that
engineering and design data is transformed into the most easily understood wording. Imo Pump must
assume personnel assigned to operate and maintain supplied equipment and apply this instruction
manual have sufficient technical knowledge and are experienced to apply sound safety and operational
practices which may not be otherwise covered by this manual.
In applications where equipment furnished by Imo Pump is to become part of processing machinery,
these instructions should be thoroughly reviewed to ensure proper fit of said equipment into overall plant
operational procedures.
WARNING
I
f installation, operation and maintenance instructions are not correctly and strictly
followed and observed, injury to personnel or serious damage to pump could
result. Imo Pump cannot accept responsibility for unsatisfactory performance or
damage resulting from failure to comply with instructions.
B. INTRODUCTION
This instruction manual covers D12DZ-250 pumps. This series of pumps has been designed for use in
fuel applications requiring high inlet pressure capabilities. The model, and design construction of each
pump can be identified by the designator code on the pump nameplate. Definitions of model
designators are identified in Figure 1.
C. DESCRIPTION OF EQUIPMENT
D12DZ-250 pumps are positive displacement, rotary screw pumps consisting of two precision bored
housing that encloses a driven screw (power rotor) and four intermeshing following screws (idler rotors).
These screws, when rotating, form a succession of closures or cavities. As they rotate, fluid is moved
axially from inlet port to outlet port in a continuous, uniform flow with minimum fluid pulsation and pump
noise.