BLACKMER NPH2F Manual

BLACKMER POWER PUMPS
960052
INSTRUCTIONS 103-A00
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
Section
Effective
Replaces
103
Oct 2015
Oct 2012
MODELS: NP1.5B, NP2F, NP2.5F, NP3F, NP4F,
NPH2F, NPH2.5F, NPH3F, NPH4F
TABLE OF CONTENTS Page
PUMP DAT
A
Safety Data 1 - 2
Technical Data 2
Initial Pump Start Up Information 2
INSTALLATION
Pre-Installation Cleaning 3
Location and Piping 3
Mounting 3
Coupling Alignment 4
Pump Rotation 4
Heating Heads / Jackets 4
Heating Heads / Electric 4
Check Valves 4
OPERATION
Pre-Start Up Check List 5
Start Up Procedures 5
Running the Pump in Reverse Rotation 5
Flushing the Pump 6
Pump Relief Valve 6
Relief Valve Setting and Adjustment 6
MAINTENANCE
Strainers 7
Lubrication 7
Vane Replacement 7
Pump Disassembly 8
Pump Assembly 8
TROUBLE SHOOTING 10
AFFF PUMPS 11
NOTE: Numbers in parentheses following individual parts
indicate reference numbers on Blackmer Parts Lists.
Blackmer pump manuals and parts lists may be obtained
from Blackmer's website (www.blackmer.com) or by
contacting Blackmer Customer Service.
NP1.5 NP2 NP2.5 NP3 NP4
103-A01 103-A02 103-A03 103-A04 103-A05
NPH2 NPH2.5 NPH3 NPH4
103-A12 103-A13 103-A14 103-A06
SAFETY DATA
This is a SAFETY ALERT SYMBOL.
When you see this symbol on the product, or in the
manual, look for one of the following signal words and be
alert to the potential for personal injury, death or major
property damage
Warns of hazards that WILL cause serious personal injury,
death or major property damage.
Warns of hazards that CAN cause serious personal injury,
death or major property damage.
Warns of hazards that CAN cause personal injury
or property damage.
NOTICE:
Indicates special instructions which are very
important and must be followed.
NOTICE:
Blackmer Pumps MUST only be installed in systems,
which have been designed by qualified engineering
personnel. The system MUST conform to all applicable
local and national regulations and safety standards.
This manual is intended to assist in the installation and
operation of the Blackmer NP Series pumps, and MUST
be kept with the pump.
Pump service shall be performed by qualified technicians
ONLY. Service shall conform to all applicable local and
national regulations and safety standards.
Thoroughly review this manual, all instructions and hazard
warnings, BEFORE performing any work on the pump.
Maintain ALL system and pump operation and hazard
warning decals.

103-A00 page 2/12
SAFETY DATA
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Failure to disconnect and lockout
electrical power before attempting
maintenance can cause shock, burns or
death
Hazardous
machinery can
cause serious
personal injury. Hazardous voltage.
Can shock, burn or
cause death.
If pumping hazardous or toxic fluids,
system must be flushed and
decontaminated, inside and out, prior to
performing service or maintenance
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury, death or major property damage
Hazardous or toxic
fluids can cause
serious injury. Hazardous pressure
can cause personal
injury or property
damage
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Failure to relieve system pressure prior
to performing pump service or
maintenance can cause personal injury
or property damage.
Do not operate
without guard in
place Hazardous pressure
can cause personal
injury or property
damage
Failure to stop the pump before
adjusting the shaft packing can cause
severe personal injury
Hazardous
machinery can
cause severe
p
ersonal in
j
ur
y
.
PUMP DATA
PUMP IDENTIFICATION
A pump Identification tag, containing the pump serial number, I.D. number, and model designation, is attached to each pump. It is
recommended that the data from this tag be recorded and filed for future reference. If replacement parts are needed, or if
information pertaining to the pump is required, this data must be furnished to a Blackmer representative.
TABLE 1 – TECHNICAL DATA
1.5”, 2”, 2.5”, 3” 4”
Maximum Pump Speed 640 RPM 500 RPM
Maximum Operating
Tem
p
erature* 240°F (115°C)
Maximum Viscosity* 20,000 SSU (4,250 cP)
Maximum
Differential Pressure* 150 psi (10.3 Bar)
Maximum
Workin
g
Pressure* 175 psi (12 Bar)
* Technical Data is for standard materials of construction.
Consult Blackmer Material Specs for optional materials of
construction.
cP = centistokes at fluid specific gravity of 1.0.
INITIAL PUMP START UP INFORMATION
Model No.: ____________________________________
Serial No.: ____________________________________
ID No.: _______________________________________
Date of Installation: _____________________________
Inlet Gauge Reading: ____________________________
Discharge Gauge Reading: _______________________
Flow Rate: _____________________________________

103-A00 page 3/12
INSTALLATION
NOTICE:
Blackmer pumps must only be installed in systems
designed by qualified engineering personnel. System
design must conform with all applicable regulations and
codes and provide warning of all system hazards.
Install, ground and wire to local and
National Electrical Code requirements.
Install an all-leg disconnect switch near
the unit motor.
Disconnect and lockout electrical power
before installation or service
Electrical supply MUST match motor
nameplate specifications.
Hazardous voltage.
Can shock, burn or
cause death.
Motors equipped with thermal protection automatically
disconnect motor electrical circuit when overload exists.
Motor can start unexpectedly and without warning.
PRE-INSTALLATION CLEANING
NOTICE:
New pumps contain residual test fluid and rust inhibitor.
If necessary, flush pump prior to use.
Foreign matter entering the pump WILL cause extensive
damage. The supply tank and intake piping MUST be
cleaned and flushed prior to pump installation and operation.
LOCATION AND PIPING
Pump life and performance will be significantly reduced when
installed in an improperly designed system. Before starting the
layout and installation of the piping system, review the
following:
1. Locate the pump as near as possible to the source of
supply to avoid excessive inlet pipe friction.
2. The inlet line must be at least as large as the intake port
on the pump. It should slope downward to the pump, and
should not contain any upward loops. Eliminate
restrictions such as sharp bends, globe valves,
unnecessary elbows, and undersized strainers.
3. A strainer should be installed in the inlet line to protect
the pump from foreign matter. The strainer should be
located at least 24" (0.6m) from the pump. For viscosities
less than 1,000 SSU (200 cP), the strainer should have a
net open area of at least four times the area of the intake
piping. For viscosities greater than 1,000 SSU (200 cP),
consult the strainer manufacturer instructions. Strainers
must be cleaned regularly to avoid pump starvation.
4. The intake system must be free of air leaks.
5. Expansion joints, placed at least 36" (0.9m) from the
pump, will compensate for expansion and contraction of
the pipes. Contact the flexible connector/hose
manufacturer for required maintenance/care and design
assistance in their use.
6. Install pressure gauges in the NPT ports provided in the
pump casing to check pump at start up.
7. ALL piping and fittings MUST be properly supported to
prevent any piping loads from being placed on the
pump.
8. Check alignment of pipes to pump to avoid strains
which might later cause misalignment. See Figure 1.
Unbolt flanges or break union joints. Pipes should not
spring away or drop down. After pump has been in
operation for a week or two, completely recheck
alignment.
Figure 1
9. The use of an intake side check or foot valve is NOT
recommended. A properly sized check valve may be
installed near the pump discharge.
PUMP MOUNTING
A solid foundation reduces noise and vibration, and will
improve pump performance. On permanent installations it is
recommended the pumping unit be secured by anchor bolts
as shown in Figure 2. This arrangement allows for slight
shifting of position to accommodate alignment with the
mounting holes in the base plate. Refer to ANSI/HI
standards or a suitable pump handbook for information on
typical pump mounting and foundations.
Figure 2 -
Pipe Type
Anchor Bolt Box
For new foundations, it is suggested that the anchor bolts be
set in concrete. When pumps are to be located on existing
concrete floors, holes should be drilled into the concrete to
hold the anchor bolts.
When installing units built on channel or structural steel type
bases, use care to avoid twisting the base out of shape
when anchor bolts are tightened. Shims should be used
under the edges of the base prior to tightening of the anchor
bolts to prevent distortion.

103-A00 page 4/12
INSTALLATION
COUPLING ALIGNMENT
The pump must be directly coupled to a gear and/or driver
with a flexible coupling. Verify coupling alignment after
installation of new or rebuilt pumps. Both angular and parallel
coupling alignment MUST be maintained between the pump,
gear, motor, etc. in accordance with manufacturer’s
instructions. See Figure 3.
1. Parallel alignment: The use of a laser alignment tool or
dial indicator is preferred. If a laser alignment tool or dial
indicator is not available, use a straightedge. Turn both
shafts by hand, checking the reading through one
complete revolution. Maximum offset should be less than
.005" (.127 mm).
2. Angular alignment: Insert a feeler gauge between the
coupling halves. Check the spacing at 90° increments
around the coupling (four checkpoints). Maximum
variation should not exceed .005" (.127 mm). Some laser
alignment tools will check angular alignment as well.
3. Replace the coupling guards after setting alignment.

Figure 3 – Alignment Check
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
PUMP ROTATION
A right-hand pump rotates clockwise with the intake on the
right side, when viewed from the driven end.
A left-hand pump rotates counterclockwise with the intake on
the left side, when viewed from the driven end.
NOTICE:
Confirm correct pump rotation by checking the pump
rotation arrows respective to pump driver rotation.
TO CHANGE PUMP ROTATION
To reverse rotation, the pump must be disassembled then
reassembled with the shaft on the opposite side of the pump.
See the ‘Maintenance’ section for instructions.
HEATING HEADS / JACKETS
NOTICE:
Maximum recommended heating jacket steam pressure
is 150 PSI (10.3 bar).
Jacketed heads are recommended for heating highly
viscous liquids, or to “thaw out” liquids that have congealed
in the pumping chamber and packing area.
Hot oil or steam can be circulated through the jacketed
heads by 3/4” NPT connections (3/8” NPT on 1.5” models)
above and below the shaft.
Pumps fitted with heating devices have
hot surfaces that can cause serious
personal injury.
Extreme heat can
cause injury or
property damage.
HEATING HEADS / ELECTRIC
The 2.5, 3 and 4” pumps may be fitted with heads for
electric heating. The inboard head has two 12.5mm bore
(85 mm deep) Heating Cartridge ports and two M6 x 1.0
(12 mm deep) Temperature Sensor ports. The outboard
bearing cover has one 12.5mm bore (85 mm deep) Heating
Cartridge port. Follow the manufacturer’s instructions when
installing the heating system.
Figure 3a – Heads for Electric Heating
CHECK VALVES
The use of check valves or foot valves in the supply tank is
not recommended with self-priming, positive displacement
pumps.
If the possibility of liquid backflow exists when the pump is
off, a check valve in the pump discharge piping is
recommended because the pump can motor in the reverse
rotation and create undue stress on all attached
components. Never start a pump when it is rotating in the
reverse rotation as the added starting torque can damage
the pump and related equipment.

103-A00 page 5/12
OPERATION
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury, death or major property damage
Hazardous pressure
can cause personal
injury or property
damage
Failure to relieve system pressure prior
to performing pump service or
maintenance can cause personal injury
or property damage.
Hazardous pressure
can cause personal
injury or property
damage
Pumps operating against a closed valve
can cause system failure, personal
injury and property damage
Hazardous pressure
can cause personal
injury or property
damage
PRE-START UP CHECK LIST
1. Check the alignment of the pipes to the pump. Pipes
should be supported so that they do not spring away or
drop down when pump flanges or union joints are
disconnected.
2. Verify proper coupling alignment.
3. If equipped with a gear reducer, check the oil level in the
gear reducer. Fill with the grade of oil indicated on the
reducer tag. For more specific instructions on Blackmer
gear reducers, refer to the appropriate Gear reducer
Installation, Operation and Instruction Manual.
NOTICE:
Blackmer gear reducers are not lubricated at the factory.
Oil must be added before initial pump start up.
4. Check the entire pumping system to verify that the proper
inlet and discharge valves are fully open, and that the
drain valves and other auxiliary valves are closed.
5. Install vacuum and pressure gauges on the pump in the
1/4” NPT connections provided to check suction and
discharge conditions after pump start-up.
6. Check the wiring of the motor, and briefly turn on the
power to make sure that the pump rotates in the direction
of the rotation arrow.
START UP PROCEDURES
NOTICE:
Consult the "General Pump Troubleshooting" section of
this manual if difficulties during start up are
experienced.
1. Start the pump. Priming should occur within one minute.
2. Check the vacuum and pressure gauges to see if the
pump is operating within the expected conditions.
Record the readings in the ‘Initial Start Up Information’
section of this manual for future reference.
3. Inspect piping, fittings, and associated system
equipment for leaks, noise, vibration and overheating.
4. If possible, check the flow rate. Record the readings in
the ‘Initial Start Up Information’ section of this manual
for future reference.
5. Check the pressure setting of the relief valve by briefly
closing a valve in the discharge line and reading the
pressure gauge. This pressure should be 10-20 psi
(0.7-1.4 bar) higher than the maximum operating
pressure, or the external bypass valve setting (if
equipped). DO NOT operate the pump against a
closed discharge valve for more than 15 seconds. If
adjustments need to be made, refer to "Relief Valve
Setting & Adjustment."
Incorrect settings of the pressure relief
valve can cause pump component
failure, personal injury, and property
damage.
Hazardous pressure
can cause personal
injury or property
damage
RUNNING THE PUMP IN REVERSE
ROTATION NOTICE:
The pump should be operated in reverse rotation for no
more than 10 minutes and only when a separate
pressure relief valve is installed to protect the pump
from excessive pressure.
It may be desirable to run the pump in reverse rotation for
system maintenance. The pump will operate satisfactorily in
reverse rotation for a LIMITED time, at a reduced
performance level.

103-A00 page 6/12
OPERATION
FLUSHING THE PUMP
NOTICE:
If flushing fluid is to be left in the pump for an extended
time, it must be a lubricating, non-corrosive fluid. If a
corrosive or non-lubricating fluid is used, it must be
flushed from the pump immediately. Water is not
suitable to remain in pump after flushing.
1. To flush the pump, run the pump with the discharge
valve open and the intake valve closed. Bleed air into
the pump through the intake gauge plug hole or through
a larger auxiliary fitting in the intake piping. Pump air for
30 second intervals to clean out most of the pumpage.
2. Run a system compatible flushing fluid through the pump
for one minute to clear out the remainder of the original
pumpage.
3. To remove the flushing fluid, follow step 1 above.
NOTICE:
After flushing the pump some residual fluid will remain
in the pump and piping.
NOTICE:
Properly dispose of all waste fluids in accordance with
the appropriate codes and regulations.
PUMP RELIEF VALVE
NOTICE:
The pump’s internal relief valve is designed to protect
only the pump from excessive pressure and must not be
used as a system pressure control valve.
The Blackmer pump internal relief valve is designed to
protect the pump for a LIMITED time operation, against a
partially closed discharge valve by allowing internal fluid
recirculation.
An external bypass system is required when operating the
pump for periods greater that one minute against a closed or
partially closed discharge valve.
The pump relief valve must be set higher than the system
pressure control valve, but must not exceed the maximum
differential pressure of the pump (see table 1).
RELIEF VALVE SETTING AND
ADJUSTMENT
The relief valve pressure setting is marked on a metal tag
attached to the valve cover. The relief valve should be set at
least 10-20 psi (0.7-1.4 Bar) higher than the operating
pressure or system pressure control valve, but no higher than
the maximum working pressure of the pump (see Table 1)
Incorrect settings of the pressure relief
valve can cause pump component
failure, personal injury, and property
damage.
Hazardous pressure
can cause personal
injury or property
damage
Relief valve cap is exposed to pumpage
and will contain some fluid
Hazardous or toxic
fluids can cause
serious injury.
DO NOT remove the R /V Cap OR adjust the relief valve
pressure setting while the pump is in operation.
1. To INCREASE the pressure setting , remove the relief
valve cap (1) and gasket (88). Loosen the locknut (3), if
equipped. Turn the adjusting screw (2) inward, or
CLOCKWISE. Inspect R/V cap O-ring/gasket (88) and
replace as required. Reattach R/V cap O-ring/gasket and
R/V cap.
2. To DECREASE the pressure setting, remove the relief
valve cap (1) and gasket (88). Loosen the locknut (3), if
equipped. Turn the adjusting screw (2) outward, or
COUNTERCLOCKWISE. Inspect R/V cap O-ring/gasket
(88) and replace as required. Reattach R/V cap O-
ring/gasket and R/V cap.
Refer to the individual Blackmer pump parts lists for various
spring pressure ranges. Unless specified otherwise, pumps
are supplied from the factory with the relief valve adjusted to
the mid-point of the spring range.

103-A00 page 7/12
MAINTENANCE
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Hazardous
machinery can
cause serious
personal injury.
Failure to relieve system pressure prior
to performing pump service or
maintenance can cause personal injury
or property damage.
Hazardous pressure
can cause personal
injury or property
damage
If pumping hazardous or toxic fluids,
system must be flushed and
decontaminated, inside and out, prior to
performing service or maintenance
Hazardous or toxic
fluids can cause
serious injury.
Failure to disconnect and lockout
electrical power before attempting
maintenance can cause shock, burns or
death
Hazardous voltage.
Can shock, burn or
cause death.
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury, death or major property damage
Hazardous pressure
can cause personal
injury or property
damage
Failure to stop the pump before
adjusting the shaft packing can cause
severe personal injury
Hazardous
machinery can
cause severe
personal injury.
NOTICE:
Maintenance must follow the indicated schedules, be
performed by qualified technicians only, and follow the
appropriate procedures and warnings as presented in
this manual.
SCHEDULED MAINTENANCE
STRAINERS
Strainers must be cleaned regularly to avoid pump
starvation. Schedule will depend upon the application and
conditions.
LUBRICATION NOTICE:
To avoid possible entanglement in moving parts do not
lubricate the gear reducer or any other parts while the
pump is running.
Sleeve bearings (bushings) are lubricated by the liquid being
pumped. Additional lubrication is not required.
IF EQUIPPED: Blackmer gear reducers are shipped from
the factory without oil in the gearcase. Fill with the grade of
oil indicated on the reducer tag. The oil should be changed
after the first 48 hours of use and approximately every 500
hours of use thereafter.
VANE REPLACEMENT
NOTICE:
Maintenance shall be performed by qualified
technicians only. Following the appropriate procedures
and warnings as presented in manual.
1. Drain and flush the pump and system as required.
2. Remove the head assembly and all other parts on the
outboard (non-driven) side of the pump. See the "Pump
Disassembly" Section.
3. Turn the shaft by hand until a vane (14) comes to the
top (12 o'clock) position of the rotor. Remove the vane.
(1.5” and 2” models have only four vanes)
Figure 4 – Vane Replacement
4. Replace the vane, making sure to install the vane with
the rounded edge outward to contact the liner and the
relief grooves facing the direction of rotation.
5. Rotate the shaft until the next rotor slot is in the top
position, and replace the vane. Continue this procedure
until all new vanes are in place.
6. Reassemble the pump as instructed in "Pump
Assembly."

103-A00 page 8/12
MAINTENANCE
PUMP DISASSEMBLY
NOTICE:
Follow all hazard warnings and instructions provided in
the “Maintenance” section of this manual.
1. Drain and flush the pump and system as required.
2. Starting on the inboard (driven) end of the pump, clean
the pump shaft thoroughly, making sure the shaft is free of
nicks and burrs. This will prevent damage to the lip seal
when the inboard head assembly is removed.
3. Remove the shaft key(35), and the packing follower stud
nuts (18). Slide the packing follower (75) from the shaft.
A slight pry with a screwdriver may be necessary.
4. Pull the packing rings (19) from the stuffing box with the
use of a packing removal tool. Use care not to scratch or
damage the shaft. Discard packing. Remove the pack
washer (58) from the stuffing box.
Note: If the pump is equipped with a commercial
mechanical seal, refer to the seal manufacturer’s
instructions for removal.
5. Remove the inboard head capscrews (21) and pry the
head assembly away from the cylinder and off the shaft.
Remove head O-ring (72) and discard
6. The sleeve bearing (bushing) (24) is press fit into the head
and should not be removed unless replacement is
necessary. See step 1 of ‘Pump Assembly’.
7. Gently pull the rotor & shaft (13) out of the cylinder. While
one hand is pulling the shaft, the other should be cupped
underneath to prevent the vanes and push rods from
falling out.
8. From the opposite (outboard) side of the pump, remove
the bearing cover capscrews (28), bearing cover (27), and
bearing cover O-ring (26). Discard the O-ring.
9. Remove the outboard head (23) as instructed in steps 4
through 6 above.
PUMP ASSEMBLY
Before reassembling the pump, inspect all component
parts for wear or damage, and replace as required. Wash
out the bearing/seal recess of the head and remove any
burrs or nicks from the rotor and shaft.
1. Inspect the sleeve bearings (bushings) in both heads for
wear or damage and replace as required.
To replace the sleeve bearings (bushings):
a. Using an appropriately sized arbor press, remove the old
bearing from the head.
b. To aid installation and prevent bearing damage, heat the
head in an oven at 200
o F (93 o C) before installing the
bearing.
c. Coat the bearing with grease and place it on the inside
face of the head, with the notched end UP. Align the
notch in the bearing with the groove in the head (see
Figure 5).
d. Using an arbor press, press the bearing into the head in
one continuous motion, until it is flush with the inside face
of the head or slightly recessed (.015" maximum).
NOTE: Ensure the bearing does not become misaligned
during the pressing motion. Starting and stopping the
pressing motion may result in a cracked bearing.
2. Reassemble the OUTBOARD side of the pump first:
For a CLOCKWISE rotation pump, position the pump
cylinder with the INTAKE port to the left.
For a COUNTERCLOCKWISE rotation pump,
position the pump cylinder with the INTAKE port to
the right.
3. Apply a small amount of quality O-ring lubricant on a
new head O-ring (72), and install in the groove on the
inside face of the outboard head (23).
Figure 5 – Bearing Location
4. For NP1.5: Place INTAKE marking on outboard head
towards INTAKE of pump. NOTE: V-notch location does
not apply to this model.
NP2, 2.5,3 AND 4: For clockwise (right-hand) rotation,
place the outboard head (23) on the cylinder with the V-
notch upward, in the 12 o'clock position. For
counterclockwise (left-hand) rotation, place the outboard
head (23) on the cylinder with the V-notch downward, in
the 6 o'clock position.
5. Install the head capscrews (21) and uniformly tighten;
torque per the Bolt Torque Table.
6. Install a new bearing cover O-ring (26) and attach the
bearing cover (27) to the outboard head. Install and
uniformly tighten the bearing cover capscrews (28);
torque per the Bolt Torque Table.
BOLT TORQUE TABLE
Model
Head
Capscrew Bearing Cove
r
Capscrew
Size Torque ft-lb (Nm) Size Torque ft-lb (Nm)
NP1.5 3/8" 25 (34) 5/16" 15 (20)
NP(H)2 3/8" 25 (34) 3/8" 25 (34)
NP(H)2.5 3/8" 25 (34) 3/8" 25 (34)
NP(H)3 3/8" 25 (34) 3/8" 25 (34)
NP(H)4 1/2" 58 (79) 5/8" 115 (156)
7. Turn the pump around and begin assembly on the
opposite, inboard end.

103-A00 page 9/12
MAINTENANCE
(1.5” and 2” models have only four vanes)
Figure 6 – Push Rod Installation
8. Remove the vanes and push rods from the rotor and
shaft assembly and inspect for wear or damage.
a. Insert the vanes (14) into the bottom rotor slots with
the rounded edges facing outward, and the relief
grooves facing in the direction of rotation. (Refer to
Figure 4.)
b. Hold the vanes in place while inserting the push rods
(77) from the top, as shown in Figure 6.
c. While holding the vanes in place, carefully slide the
non-driven end (shorter end) of the pump shaft into
the open end of the pump cylinder and into the
installed outboard head.
d. Install the remaining vanes into the top slots of the
rotor with the relief grooves facing in the direction of
rotation and the rounded edges outward.
9. Install the inboard head (20) as instructed previously in
steps 3 through 6.
10. PACKING AND PACKING FOLLOWER
When necessary to re-pack, use a full set of new
packing rings. Packing is furnished in sets with the
correct number of rings. Never add new rings to an old
set of packing.
a. Insert the pack washer (58) into the stuffing box of
the inboard head (20).
b. Insert each of the packing rings (19) separately into
the stuffing box, staggering the split joints 180
degrees, so that they are not overlapping or near the
joint of the preceding ring. Use the packing follower
to properly seat each ring after placement.
c. After all of the packing rings are in place, slide the
packing follower (75) against the packing. Install and
hand-tighten the stud nuts (18) evenly.
NOTE: Adjustment to the packing follower should be
made after the running the pump for 10 to 15 minutes
(see "Packing Adjustment").
11. PACKING ADJUSTMENT
It is important that the packing be properly adjusted to
prevent overheating.
Failure to stop the pump before
adjusting the shaft packing can cause
severe personal injury
Hazardous
machinery can
cause severe
personal injury.
a. While the liquid is being pumped, check for leakage
from the stuffing box. If necessary, STOP the pump
and uniformly tighten the packing follower stud nuts
(18) 1/4 turn at a time to reduce leakage.
b. Restart the pump and check the stuffing box
temperature several minutes after each adjustment
for signs of overheating.
c. Repeat steps a and b until leakage is controlled, and
no excess heat develops.
d. Check the packing again after 20 to 30 minutes of
running the pump, and readjust, if necessary.
NOTE: Some leakage is desirable to lubricate the packing,
but in some cases it is unacceptable, depending on the
application. A commercial mechanical seal should be used
for applications requiring minimal shaft leakage.
12. OPTIONAL LIP SEAL ASSEMBLY
a. Insert the wave spring (152D) into the stuffing box of
the inboard head.
b. Lightly grease the inboard shaft to facilitate lip seal
installation. With the lip seal spring facing the pump,
slide the lip seal assembly (152) into the stuffing box,
against the wave spring.
c. Install the seal follower (75) against the lip seal
assembly. Install and tighten the follower capscrews
(16).
NOTE: When installed properly, lip seals should require
no adjustment.
13. COMMERCIAL MECHANICAL SEAL
On pumps equipped with a commercial mechanical seal,
refer to the separate literature accompanying the
mechanical seal for installation instructions.
14. RELIEF VALVE ASSEMBLY
a. Insert the valve (9) into the relief valve body (6) with
the fluted end inward.
b. Install the relief valve spring (8) and spring guide (7)
(and valve collar (9A) on the NP2.5) against the valve.
c. Attach a new relief valve gasket (10) and the valve
cover (4) on the relief valve body (6).
d. Screw the relief valve adjusting screw (2) into the valve
cover until it makes contact with the spring guide (7).
e. Install the relief valve cap (1) and gasket (88) after the
relief valve has been precisely adjusted.
NOTICE:
The relief valve setting MUST be tested and adjusted
more precisely before putting the pump into service.
Refer to "Relief Valve Setting and Adjustment"
15. Reinstall coupling, shaft key, and coupling guards.
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard in
place.
15. Refer to “Pre-Start Up Check List” and “Start Up
Procedures” sections of this manual prior to pump
operation.

103-A00 page 10/12
PUMP TROUBLESHOOTING
NOTICE:
Maintenance shall be performed by qualified technicians only,
following the appropriate procedures and warnings as presented in this manual.
SYMPTOM PROBABLE CAUSE
Pump Not Priming 1. Pump not wetted.
2. Suction valve closed.
3. Air leaks in the suction line.
4. Strainer clogged.
5. Suction line or valves clogged or too restrictive.
6. Wrong rotation on motor.
7. Broken drive train.
8. Pump vapor-locked.
9. Pump speed too low for priming.
10. Worn Vanes.
Reduced Capacity 1. Suction valves not fully open.
2. Air leaks in the suction line.
3. Excessive restriction in the suction line (i.e.: undersized piping, too many elbows &
fittings, clogged strainer, etc.).
4. Damaged or worn parts.
5. Excessive restriction in discharge line causing partial flow through the relief valve.
6. Relief Valve worn, set too low, or not seating properly.
7. Vanes installed incorrectly (see "Vane Replacement").
Noise 1. Excessive vacuum on the pump due to:
a. Undersized or restricted fittings in the suction line.
b. Pump speed too fast for the viscosity or volatility of the liquid.
c. Pump too far from fluid source.
2. Running the pump for extended periods with a closed discharge line.
3. Misalignment of the pump.
4. Baseplate not securely mounted.
5. Sleeve Bearings (bushings) worn or damaged.
6. Vibration from improperly anchored piping.
7. Bent shaft, or drive coupling misaligned.
8. Excessively worn rotor.
9. Malfunctioning valve in the system.
10. Insufficient oil in the gear reducer.
11. Damaged vanes (see following category).
Damaged Vanes 1. Foreign objects entering the pump.
2. Running the pump dry for extended periods of time.
3. Cavitation.
4. Viscosity too high for the vanes and /or the pump speed.
5. Incompatibility with the liquids pumped.
6. Excessive heat.
7. Worn or bent push rods, or worn push rod holes.
8. Settled or solidified material in the pump at start-up.
9. Hydraulic hammer - pressure spikes.
10. Vanes installed incorrectly (see "Vane Replacement”).
Broken Shaft 1. Foreign objects entering the pump.
2. Viscosity too high for the pump speed.
3. Relief valve not opening.
4. Hydraulic hammer - pressure spikes.
5. Pump/driver misalignment.
6. Overtightened V-belts, if equipped.
7. Excessively worn vanes or vane slots.
8. Settled or solidified material in the pump at start-up.


103-A00 page 11/12
PUMP TROUBLESHOOTING ….Continued
SYMPTOM PROBABLE CAUSE
Overload on Motor 1. Horsepower of motor not sufficient for application.
2. Improper wire size or wiring.
3. Misalignment.
4. Excessive viscosity, pressure or speed.
5. Faulty or worn sleeve bearings (bushings).
6. Rotor rubbing into head.
7. Excessively tight packing (see “Packing Adjustment”).
8. Unevenly tightened stud nuts, causing shaft interference with packing follower.
Mechanical Seal Leakage
(if equipped) 1. Seal Rings/O-rings not compatible with the liquids pumped.
2. Seal Rings/O-rings nicked, cut or twisted.
3. Shaft at seal area damaged, worn or dirty.
4. Excessive cavitation.
5. Mechanical seal faces cracked, scratched, pitted or dirty.
6. Pump sleeve bearings worn excessively.
NOTE: Consult commercial mechanical seal manufacturer for more information
on mechanical seal troubleshooting.
AFFF SERVICE PUMPS – Special Notes
NOTICE:
Design and materials of construction should be suitable
for use with the type of foam concentrate to minimize
corrosion, foaming, or sticking
NOTICE:
Blackmer NP pumps are not approved for use in systems
where automatic system pressure balance exceeds 200
psi, 13.79 bar (175 psi, 12.07 bar for the NP4, NPH4).
DESCRIPTION
AFFF pumps were previously listed as FFNP models. They
are now NP pumps with specific options:
Duravanes (1.5” – 3”)
Laminate Vanes (4”)
Lip Seal
Corrosion Resistant RV
Stainless Steel 200 psi spring
Buna-N O-Rings
Casing Drain
TABLE 1 – TECHNICAL DATA
1.5”, 2”,
2.5”, 3” 4”
Maximum Differential
Pressure 200 psi (13.79 Bar) 175 psi (12.07 Bar)
Maximum Working
Pressure 220 psi (15.17 Bar) 195 psi (13.44 Bar)
LOCATION AND PIPING
NOTICE:
A system pressure control device, in addition to the
pump relief valve, is required.
OPERATION NOTICE:
The pump must be tested, for a ten minute period, every
30 days. During this activity, the pump discharge must
be recirculated through a bypass system. Do not
operate the pump against a closed discharge.
An electrical time clock is recommended to record
elapsed operating time. Refer to the ‘Scheduled
Maintenance - Pump’ section.
PUMP RELIEF VALVE
NOTICE:
The pump’s internal relief valve is designed to protect
only the pump from excessive pressure and must not be
used as a system pressure relief valve. Foam system
pressure must be controlled by a separate bypass
pressure control valve which returns bypassed fluid to
the foam storage tank.
SCHEDULED MAINTENANCE - PUMP
1. Pump MUST be disassembled and checked after each
ten hours of system trial operation, or five years,
whichever occurs sooner. The heads (20 & 23), cylinder
(12), bushing (24) and vanes (14) MUST be inspected
for wear. Replacement of worn parts is required.
Inspect the rotor and shaft for wear or corrosion. If rotor
& shaft indicates wear, scaling, flaking rust particles or
cracking, replacement is required.
2. If during operation of the system the contents of the
foam concentrate tank has been depleted OR there is
reason to believe the pump has run dry, the pump MUST
be completely disassembled and carefully inspected for
damage or wear. The heads (20 & 23), cylinder (12),
bushing (24) and vanes (14) MUST be inspected for
wear. Replacement of worn parts is required. Inspect
the rotor and shaft for wear or corrosion. If rotor & shaft
indicates wear, scaling, flaking rust particles or cracking,
replacement is required.

Sliding Vane Pumps: 5 to 2200 GPM
Refined Fuels, Liquefied Gases, Solvents,Process
Stainless Steel Sliding Vane Pumps
1 to 265 GPM: Acids, Brines, Sugars, Syrups,
Beer, Beet Juice, Cider, Flavor Extracts, etc.
System One®Centrifugal Pumps
10 to 7500 GPM; Process, Marine
Magnetic Drive Pumps
Stainless Steel: 14 to 215 GPM
HXL 6, 8 & 10”
Sliding Vane Pumps
130 to 2,220 GPM
Refineries
Terminals
Barges
Ships
Reciprocating Gas Compressors
Liquefied Gas Transfer, Boosting, Vapor Recovery
Hand Operated Pumps
Dispensing, Transfer, In-line
Accessories
Gear Reducers, Bypass Valves, Strainers
Visit www.blackmer.com for complete information on all Blackmer products
1809 Century Avenue, Grand Rapids, Michigan 49503-1530 U.S.A.
Telephone: [phone] • Fax: [phone]
E-mail: [e-mail] • Internet Address: www .blackmer.com