Imo DLH12D User Manual
INSTRUCTION MANUAL
AND
PARTS LIST
FOR
DLH12D-312(P) PUMPS
Manual No. SRM00094 Rev. 0 MARCH 2010
READ ENTIRE PAGE BEFORE PROCEEDING
FOR THE SAFETY OF PERSONNEL AND TO PREVENT DAMAGE TO EQUIPMENT, THE
FOLLOWING NOMENCLATURE HAS BEEN USED IN THIS MANUAL:
DANGER
Failure to observe the precautions noted in this box can result in severe bodily injury
or loss of life.
WARNING
Failure to observe the precautions noted in this box can cause injury to personnel by
accidental contact with the equipment or liquids. Protection should be provided by
the user to prevent accidental contact.
CAUTION
Failure to observe the precautions noted in this box can cause damage or failure of
the equipment.
Non compliance of safety
instructions identified by the
following symbol could
Safety instructions where
electrical safety is
involved are identified by:
affect safety for persons:
ATTENTION
Safety instructions which
shall be considered for
reasons of safe operation
of the pump and/or
protection of the pump
itself are marked by the
sign:
ATTENTION
CONTENTS
SAFETY AND TABLE OF CONTENTS .............................................................................A
A. GENERAL INSTRUCTIONS ...................................................................................... 1
B. INTRODUCTION........................................................................................................ 1
C. DESCRIPTION OF PUMP FEATURES ...................................................................... 1
D. PUMP MODEL IDENTIFICATION ............................................................................. 2
E. ORDERING INSTRUCTIONS .................................................................................... 3
F. OPERATION .............................................................................................................. 3
G. PARTS LIST ............................................................................................................... 4
H. PUMP MAINTENANCE ............................................................................................. 5
I. TROUBLESHOOTING ............................................................................................... 9
J. FIELD AND FACTORY SERVICE AND PARTS .......................................................... 9
K. ASSEMBLY DRAWINGS ................................................................................................9, 10
ATTENTION
If operation of pump is critical to your business, we strongly recommend you keep
a spare pump or major repair kit in stock at all times. As a minimum, a minor
repair kit (o-rings, gaskets, shaft seal and bearings) should be kept in stock so
pump refurbishment after internal inspection can be accomplished.
A
A. GENERAL INSTRUCTIONS
The instructions found herein cover the disassembly, assembly and parts identification of Series
DLH12D 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 text of the
manual 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.
If 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.
WARNING
B. INTRODUCTION
This instruction manual covers Series DLH12D Imo pumps. This series of pumps has been designed
for use in high pressure crude oil applications including those at very low viscosities. 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 PUMP FEATURES
The DLH12D Series pumps are positive displacement, rotary screw pumps consisting of a 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. By design, all rotor sets are hydraulically balanced in the radial direction.
Idler rotors (31 and 46) are balanced axially by internally transferring high pressure oil from the pump
discharge end to the pump inlet end (thrust end). The high pressure oil is transferred to the pump inlet
end through bores that have been gun drilled axially through the idler rotors (31 and 46).
1
Ball Bearing
The DLH12D-312(P) series pumps are equipped with a permanently lubricated standard Conrad antifriction ball bearing. The power rotor is provided with a Balance Piston to provide axial hydraulic balance
to the power rotor. The size (diameter) of the balance piston is selected to produce minimal axial thrust
loads on the anti-friction ball bearings thereby resulting in at least a minimum of 25,000 hours calculated
ball bearing life. There is no need to service the ball bearing. However, the ball bearing should be replaced
when removed from its installed position on the power rotor.
Mechanical Seals
The DLH12D-312(P) series pumps are equipped with a positive drive mechanical seal. The rotating face
is a Blister Resistant Carbon face, a Silicon Carbide stationary face and fluorocarbon elastomers. Refer
to mechanical seal drawing, figure 2, for assembly and construction.
When ordering new mechanical seals, it is important that the pump designator and/or serial number be
given. When pump designator and/or serial number cannot be ascertained, operating conditions should
be listed so that proper mechanical seal can be supplied.
D. PUMP MODEL IDENTIFICATION
This instruction manual covers the Imo Series DLH12D pumps with rotor size 400. The model of
each pump is identified on pump nameplate.
Figure 1 – Model Designator Definitions
Carbide Thrust
Block
-
Bi
Metal Babbitt
Rotor Housings
Integral Balance Piston
Housings and Inboard
Cover
Basic Design Series
Seal Design
D
L H
12D
X X X X -
XXX
X
Lead and Rotation
Rotor Size
Special
T- Carbide Seal Seat
S - Steel Case
2
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