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
E. ORDERING INSTRUCTIONS
When corresponding with Imo Pump regarding Series DLH12D pumps, refer to pump nameplate, this
instruction manual, and assembly drawing as instructed below:
1. From pump nameplate, record the pump model number, serial number and manufactured date.
2. Record instruction manual number, revision and date.
3. From the assembly drawing and/or parts list (Table 2) in manual, provide IDP number(s) and
names for replacement part(s).
4. Give above information to your Imo service representative. Please call 1-877-853-7867 for
further guidance.
F. OPERATION
F.1 LIQUID LIMITATIONS
Never operate with thin liquids such as solvents or water. The pump is designed for liquids
having general characteristics of oil.
F.2 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 that of operational limitations. Equipment must not be operated
without verifying system’s operating requirements are within pump’s capabilities.
Under no circumstances are the following operating limits (specified in Table 1) to be exceeded
without specific approval from Imo Pump.
Table 1 – Normal Pump Operating and Structural Limits
MAXIMUM SPEED ................................................................................................................. 1750 RPM
VISCOSITY ....................................... 2 cSt (32.6 SSU) Minimum – 20,000 SSU (4,315 cSt) Maximum
MINIMUM – MAXIMUM LIQUID TEMPERATURE.......................................... 0 to 250 F (-18 to 121 C)
MAXIMUM INLET PRESSURE.................................................................................................. 150 psig
MAXIMUM DISCHARGE PRESSURE.................................................................1800* psig, Cont. Duty
FILTRATION................................................................................ (See General Instruction Manual, CA-1)
DRIVE ..................................................................................................................................... Direct only
MOUNTING ............................................................................... Foot or Flange mounted in any attitude
* Contact Imo for higher pressures.
3
G. PARTS LIST
Table 2 – Pump Parts List
IDP QTY DESCRIPTION KIT IDP QTY DESCRIPTION KIT
1 1 Case 31 2 Idler Rotor Sub-Assembly XX
2 1 Housing-Babbitted XX 35 2 Spiral Ring X
3 2 O-Ring X 36 1 O-Ring X
4 2 Vent Pin 37 1 Inlet Head
5 1 Fastener Seal X 38 1 Plug
6 1 Stop Pin XX 41 1 Elbow
7 1 Housing Babbitted XX 42 1 Seal Pipe
8 1 Cover 43 1 Fitting
9 1 Balance Piston Bushing X 44 1 Nipple
11 1 Idler Stop Sub-Assembly XX 45 1 Elbow
14 1 Bearing Retainer 46 2 Idler Rotor Sub-Assembly XX
17 1 Power Rotor XX 48 1 Spacer
19 1 Mechanical Seal X 49 2 Spacer
20 1 Seat Adapter Sub-Assembly XX 50 1 Thrust Plate XX
23 2 Retaining Ring X 51 1 Thrust Block
24 1 O-Ring X 52 2 Cap Screw
25 1 Ball Bearing X
26 1
27 4 Hex Bolt 27 56 1 Spacer
28 1 Key 28 91 16 Washer
X = Minor Repair Kit Items.
XX = Major Repair Kit Items. (Items marked (X) are included in Major Repair Kit).
Tube
26 55 16 Hex Bolt
53 2
Cap Screw
4
H. PUMP MAINTENANCE
WARNING
Failure to observe precautions while installing, inspecting and maintaining pump can
cause injury to personnel from accidental handling of liquids that may harm skin or
clothing, or fire hazard risks from flammable liquids, or injury from high pressure fluid jets.
DANGER
BEFORE working on equipment, make sure all power to equipment is disconnected and
locked-out.
H.1 GENERAL COMMENTS
Determine the pump model identification shown on the pump nameplate to select the applicable
pump assembly shown in Assembly drawing SF6454. Refer to that assembly for the following
instructions.
NOTE: Part number identifiers (IDP’s) contained within parenthesis such as (10) refer to
circled numbers shown on assembly drawings, figure 2 and Table 2.
H.2 TOOLS REQUIRED
Procedures described in this manual require common mechanics hand tools, a torque wrench,
dial indicator and suitable lifting device (such as) slings, straps, etc.
H.3 DISASSEMBLY PROCEDURES
CAUTION
Fluid leakage from disassembly of pump may make floor slippery and cause
personal injury.
1. Close suction and discharge piping to pump and disconnect piping. Remove seal piping
(42) including fittings (41, 43, 44, & 45). Remove drain plugs (38), and drain unit.
Remove pump from driver, coupling and base plate. Remove coupling hub and key (28).
2. Remove bolts (55), washers (91), and inlet head (37).
3. Remove O-ring (36) from inlet head (37).
4. Remove capscrews (53) to disassemble thrust plates (51 & 50) and spacers (49).
Disassemble thrust plate (50) from block (51) by removing capscrews (52).
5. Remove spiral rings (35) from grooves in case (1). Remove spacer (48).
6. Remove suction idlers (46) by unscrewing them from inlet end of pump. Remove
remaining idlers (31) from housings (7, 2) by rotating power rotor (17) in a counterclockwise direction.
CAUTION
Do not permit idlers (46, 31) to drop as they emerge from housings (7, 2).
5
7. Remove bolts (27) and bearing retainer (14).
8. Remove assembled power rotor (17). Removal of power rotor (17) includes removal of
retaining rings (23), ball bearing (25), spacer (20), mechanical seal (19), and spacer (56).
9. Disassemble power rotor (17) as follows:
a. Using a flat nosed tool, such as a screw driver, remove retaining rings (23) located on
both sides of ball bearing (25) from their grooves in power rotor (17).
b. Sealed ball bearing (25) is assembled to power rotor (17) with a light press fit. Ball
bearing (25) may be removed by using a bearing puller or a vertical arbor press. When
using press, two pieces of key stock are to be placed through openings of inboard cover
(8) underneath ball bearing (25) on both sides of power rotor shaft. Key stock should be
long enough to support power rotor (17) as it is placed in press. Press ram is to be
positioned against power rotor (17) coupling end face. Gently press power rotor (17)
through ball bearing (25). Ensure power rotor (17) does not fall to floor once ball bearing
(25) is off of its diameter.
c. Remove mechanical seal stationary seat adapter (20) from power rotor (17) shaft.
Remove mechanical seal stationary sealing face from adapter (20). Loosen set screws
on mechanical seal rotating assembly body and remove, along with spacer (56), from
power rotor (17).
10. Remove gasket (24) from inboard cover (8).
11. Remove bolts (55) and inboard cover (8) from case (1).
12. Remove O-ring (3) from inboard cover (8).
13. Remove idler stop subassembly (11) from inboard cover (8) by removing bolts (52).
14. Remove tube (26) from idler stop subassembly (11).
15. Remove balance piston bushing subassembly (9) from inboard cover (8).
16. Remove stop pin (6) and fastener seal (5) from case (1).
17. Remove housing (7) from case (1).
18. Remove rotor housing (2) from case (1). Remove o-ring (3) from housing (2).
Do not permit housings (7) & (2) to drop as they are removed from pump. Each
housing weighs approximately 300 lbs.
19. Remove aligning vent pins (4) from housing (7 or 2).
Do not permit housing (7) to drop as it is removed from pump.
CAUTION
CAUTION
6
H.4 PUMP ASSEMBLY PROCEDURE
Note: Prior to reassembly of pump, all parts should be cleaned and inspected for nicks and
burrs. Replace all worn or damaged parts. Imo Pump recommends replacement of all
O-rings, gaskets, mechanical seal and ball bearing when these parts are disturbed
from their previously installed positions. Coat all parts with light lubricating oil to assist
in assembly.
Torque fasteners to values described in the assembly steps and shown on the pump
assembly drawing included in the manual.
1. Install O-ring (3) in groove of discharge housing (2).
2. Install vent pins (4) in end of inlet housing (2).
3. Install discharge housing (2) in pump case (1), from suction end of case, aligning groove in
housing (2) to stop pin hole in case (1). Install stop pin (6) with fastener seal (5) in case (1).
4. Install inlet housing (7) in case (1), ensuring that holes in housing face engage with vent
pins (4) in discharge housing (2).
5. Install balance piston bushing (9) in bore of inboard cover (8).
6. Install tube (26) in idler stop (11) and install on inboard cover (8). Ensure anti-rotation pin in
idler stop (11) engages with slot in the balance piston bushing (9) face. Secure with cap
screws (52). Torque cap screws to 36 ± 2 lb. in.
7. Install inboard cover (8) on case (1) using bolts (55). Be sure that tube (26) in idler stop
(11) engages with hole in discharge end face of rotor housing (2). Torque bolts (55) to 120
± 10 lb. ft.
8. Assemble mechanical seal (19) – use figure 2 - and ball bearing (25) as follows.
a. Install O-ring in groove of mechanical seal (19) stationary seat. Install mechanical
stationary seat in mechanical seal spacer sub-assembly (20) ensuring that spring pin is
properly positioned to engage slot in seal seat.
b. Install mechanical seal (19) rotating assembly on power rotor (17) next to spacer (56).
c. Wipe mechanical seal rotating and stationary faces with a clean, lint free cloth before
assembling faces together.
d. Install assembled seal seat adapter (20) on power rotor shaft and carefully place the
mechanical seal stationary face on the mechanical seal rotating face.
e. Install inner retaining ring (23) in groove of power rotor (17).
f. Press ball bearing (25) on power rotor (17), pressing only on inner race of ball bearing
(25) until it is located next to inner retaining ring (23).
g. Install outer retaining ring (23) in groove of power rotor (17).
h. Tighten mechanical seal rotating assembly (figure 2) setscrews.
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9. Install O-ring (24) to inboard cover (8) counter bore. A small amount of grease may be
applied to hold the O-ring (24) in place.
10. Install assembled power rotor (17) in pump, centering all parts as they enter inboard cover
(8). Align one of the openings in seat adapter sub-assembly (20) over drain in inboard
cover (8).
11. Install bearing retainer (14) to inboard cover (8) using bolts (27). Torque bolts (27) to 55 ±
5 lb. ft.
12. Install idlers (31, 46) into rotor housings by meshing threads with power rotor thread and
screwing them into housing idler bores.
13. Install spacer (48) to pump case (1) bore and position next to suction rotor housing (7).
14. Install spiral rings (35) to groove in pump case (1) bore.
15. Assemble thrust plate and block (50 & 51) with capscrews (52). Torque cap screws (52)
to 130 ± 10 lb. in. Install spacers (49) and thrust plate assembly, to suction rotor housing
(7) using cap screws (53). Torque cap screws (53) to 45 ± 2 lb. ft.
16. Install O-ring (36) to groove in inlet head (37).
17. Install inlet head (37) using bolts (55). Torque bolts to 54 ± 5 lb. ft.
18. Install seal piping (42), including fittings (41, 43, 44, & 45), and drain plug (38).
Note: Inlet head (37) can be rotated and repositioned in 90° increments to suit suction
piping. To change inlet position, disconnect seal piping (42), remove bolts (55) and
rotate inlet head to desired position. Install bolts (55) and torque to 54 +/- 5 lb ft.
Reconnect seal piping (42).
19. Install coupling hub key (28). Install and align pump and driver as specified in General
Instruction Manual, CA-1.
8
I. TROUBLESHOOTING
For assistance with troubleshooting see General Instruction Manual, CA-1.
J. FIELD AND FACTORY SERVICE AND PARTS
Imo Pump maintains a staff of trained service personnel that can provide pump installation, pump
start-up, maintenance/overhaul and troubleshooting supervision as well as installation and
maintenance training.
Our factories provide maintenance as well as overhaul and test facilities in the event user prefers to
return pumps for inspection or overhaul. Factory-overhauled pumps are normally tested and
warranted “as-new” for a period of one year from date of shipment. For either field service or factory
overhaul assistance, contact your local Imo Sales Office or representative at Technical/Customer
Service Department in Monroe, NC, USA, 1-877-853-7867.
Most pumps have repair kits available. Minor Repair Kits are used to repair leaking seals, bad
bearings and/or for re-assembly after pump tear-down. They include (as applicable) pump shaft
seals, packing, all gaskets/O-rings and bearings. Major Repair Kits are sufficient to rebuild
completely worn-out pumps to “as-new” condition. They include all parts found in Minor Repair Kits
plus all major internal parts subject to wear. Since kits have all necessary parts, kit purchase is
preferred rather than selecting individual parts. When parts are individually selected from Parts List,
some needed components are often overlooked. In addition, mixing worn or used parts with new
parts risks rapid wear and shortened service life from new parts.
Figure 2
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10
A Colfax Business Unit
IMO Pump
1710 Airport Road 28110
PO Box 5020
Monroe, NC/USA 28111-5020
Tel: 1+ (704)289-6511
Email: imo.pump@colfaxcorp.com
Web: www.imo-pump.com
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