NAFFCO NF-VTP Series Owner's manual

FIRE PUMP
INSTALLATION,
OPERATION &
MAINTENANCE
VERTICAL TURBINE - NF-VTP SERIES
INSTRUCTIONS

Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
FIRE PUMPS - NF-VTP SERIES
Ref. No. NFVTP-IOM/2016/V.02
CONTENTS
I of II
1. SAFETY 1
1.1. General Safety Instructions 1
1.2. Electric Hazards 1
1.3. Mechanical Hazards 1
2. INTRODUCTION 1
3. IDENTIFICATION 2
4. HANDLING 2
5. INSTALLATION 3
5.1. Foundation 3
5.2. Mounting the pump 4
5.3. Mounting hollow shaft drive(r) 6
5.4. Mounting Horizontal Driver (Engine or Horizontal Motor) 8
5.5. Mounting Drive Shaft 9
5.6. Aligning Pump and Driver 10
5.7. Drive Shaft Alignment 11
5.8. WATER TANK 13
5.9. Delivery Piping 14
5.10. Pressure Relief Valve 15
5.11. Operating instructions of flow meter 16
5.12. Pressure sensing line 16
5.13. ENGINE Cooling Line 17
5.14. Fuel Tank Arrangement 19
5.15. Battery Units 20
5.16. Pressure Setting 21
5.17. Pipes & Fittings material of construction 21
5.18. G. A. Diagram of fire pump room arrangement 22
5.19. SCHEMATIC Diagram of fire pump Installation 23
5.20. Check List for Fire Pump Set after installation 24
6. OPERATION 26
6.1. Check List for Fire Pump Set Prior to Operation / Commissioning 26

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CONTENTS
II of II
6.2. Start up 27
6.3. Methods of Stopping 27
6.4. Field Acceptance Test Form for Fire Pump Set 28
7. MAINTENANCE 28
7.1. Weekly Inspection And Testing 28
7.2. Visual Inspection 28
7.3. Jockey Pump – Testing 29
7.3. Electric Fire Pump – Test Procedure 29
7.4. Diesel Fire Pump – Test Procedure 29
8. DISMANTLING AND REASSEMBLY 30
8.1. General 30
8.2. Gland Packing Replacement 30
8.3. Dismantling 31
8.4. Inspection, Replacement and Reassembly 33
8.5. Exploded View of Split case Fire Pump 34
8.6. Parts Details of Vertical Turbine Fire Pump 35
9. SPARE PARTS, TOOLS & CONSUMABLES 35
9.1. Spare Parts Policy 35
9.2. Recommended Spare Parts 36
9.3. Recommended Tools And Instruments 36
9.3. Recommended Consumables 36
9.4. Recommended Lubricant Standards 36
10. FAULTS & REMEDIES 37
11. FIRE PUMP INSPECTION, TESTING AND MAINTENANCE SCHEDULE 40
11. FIRE PUMP INSPECTION, TESTING AND MAINTENANCE SCHEDULE 41
11. FIRE PUMP INSPECTION, TESTING AND MAINTENANCE SCHEDULE 42
11. FIRE PUMP INSPECTION, TESTING AND MAINTENANCE SCHEDULE 43
11. FIRE PUMP INSPECTION, TESTING AND MAINTENANCE SCHEDULE 44
12. POLICY ON WARRANTY OF NAFFCO PUMP SETS 45
NOTES 46

DO NOT OPERATE THIS PUMP AT ANY PRESSURE, FLOW
RATE, OR LIQUID TEMPERATURE OTHER THAN THOSE
WHICH SHOWN ON THE NAME PLATE. DO NOT PUMP
ANY LIQUID OTHER THAN WATER. IGNORING THIS
WARNING CAN RESULT IN PUMP FAILURE AND SERIOUS
PERSONAL INJURY OR DEATH.
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1.1. General Safety Instructions
1.2. Electric Hazards
Check proper earth connection of the electric, diesel, jockey controllers and electric motors.
Make sure safety labels and operation labels are stuck in the controllers if damaged please get from NAFFCO and
replace.
Use only qualified personnel for installation and maintenance.
Electric motor cables terminals should be properly terminate and covered with terminal cover.
Inspect cable and connector if any damage replace immediately.
Do not keep tools on top of battery, this could result short circuit.
1.3. Mechanical Hazards
Wear eye protection during welding, grinding, drilling etc. Wear ear protection while operating diesel engine. Always
wear safety shoes and safety gloves.
Monitor water leakage of pump gland packing. If excessive leak adjust the packing, do not place hands or finger into
this area.
During maintenance disconnect battery negative terminal connector.
Do not refuel the engine when its running, fuel fumes are highly flammable.
Diesel engine exhaust pipe line should be insulated from temperature and it should be kept separate from discharge
line.
2. INTRODUCTION
This manual provides general instruction for the installation, operation, maintenance, dismantling and assembling of
vertical turbine fire pump manufactured by NAFFCO, U.A.E. Each centrifugal fire pump is tested in our factory as per
1. SAFETY
If the safety labels are missed or damaged, contact NAFFCO and get label and replace.
While starting pump set make sure pump set drive shaft guard fixed in the pump set.
Only proper tools of correct size shall be used for maintenance and service.
Do not wear loose clothing that could catch on moving parts.
Pump room should be kept clean from oil, waste cloth, water and easily explosive materials.
Pump room should not be treated a like store room.
Fire pump should be monitored during running to ensure that it was started due to an actual demand and water tank
should be monitored to avoid dry run condition.

Fig. No. 02-a
FORKLIFT
DIESEL ENGINE
Fig. No. 01
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3. IDENTIFICATION
Every pump unit is coming with separate name plate. This name
plate is having serial number, model, flow rate and head.
It is important that the serial number should be quoted while
claiming for spares or service. This will identify the unit exactly
and ensure that correct advice and parts are selected. If it is
known that any update or modification to the pump has been
carried out since original supply then this information is also
crucial (Refer Fig. No. 01).
4. HANDLING
Pump set shifting and lifting shall be done using forklift or crane or hoist(refer Fig Nos. 02-a, 02-b, 02-c). When lifting
the fire pump set it should be very careful not to broke or bend it. Column and shaft should be supported by suitably
sized timbers while laying on floor. Strainer if fitted on the pump should be removed prior to lifting to avoid using
it as a pivot point during lifting. Only lifting lugs on the discharge head should be used whenever the entire pump is
lifted as an assembled unit.
NFPA guideline and hydrostatically tested in accordance with the Hydraulic Institute Standards to verify individual
performance. Certified copies of all test reports shall be submitted to the engineer for approval, and our QC shall
engineer check the all equipment against the shipping paper.
The NAFFCO UL Listed centrifugal pumps will give trouble-free and satisfactory service for a long time if they are
properly installed and maintained periodically. Follow the instructions in this manual carefully. Do not run the pumps
under operating instructions which differ from those specified by us. Motors, engines, controllers, jockey pump, right
angle gear drives, drive shafts and other accessories are provided with their on individual IOM manuals. They should
be consulted in tandem with the corresponding instructions provided in this manual for all installation, operation and
maintenance activities described herein.

Fig. No. 03
horizontal driver foundation vt pump foundation
base frame
mounting flange
ø20 (4 nos.)
200
(TYP)
200
(TYP)
AA
dia. - ref. catalogue dia. - ref. catalogue
Fig. No. 02-b Fig. No. 02-c
CRANE
COLUMN PIPE
FIRE PUMP
HOIST
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5. INSTALLATION
Fire water pump sets and control systems should be installed, and accepted, in accordance with NFPA 20. Failure to
install the supplied NAFFCO fire pump set fully in accordance with the NFPA 20 will void the equipment warranty.
Proper ventilation and drainage system shall be provided for fire pump room.
5.1. Foundation
We recommend that you install the pump on a concrete foundation above the water tank which is heavy enough to

Fig. No. 04
horizontal driver foundation vt pump foundation
base frame mounting flangedia. - ref. catalogueø20 (4 nos.)
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5.2. Mounting the pump
Pumps are usually supplied assembled. First clean the discharge head base mounting flange. Inspect the concrete
foundation for dust, dirt, oil, chips water etc. and remove any contaminants. Refer grout manufacturer’s instructions
for cleaning and follow the same. Remove water and/or debris from anchor bolt holes/sleeves also. When using sleeve
type bolts fill the sleeves with packing or rags to prevent grout from entering it.
Fit shackles on the lifting lugs with bolts. Sling through the shackles and hoist the pump into position over foundation.
Shackles and slings should be rated to handle in excess of the pump weight. Lower the pump assembly carefully until
the discharge head is just above the foundation bolts and guide it so that it doesn’t strike the sides of the concrete
foundation opening. Orient the pump so that the discharge nozzle is in the right direction and the holes in the base
provide permanent and rigid support to the entire pump. Foundation area should have adequate space for future
inspection and maintenance activities and should be sufficient enough to provide a solid footing. The foundation must
be capable of absorbing any vibration, normal strain or shock. It should have enough strength to support the complete
weight of the pump including driver related components and weight of the water passing through the pump during
operation.
As a rule of thumb, the weight of the raised concrete foundation should be 2.5times the total weight of these components.
If structural foundations are provided instead of concrete foundation then it should be constructed properly after a
detailed structural strength analysis. The concrete foundation must have an absolutely level and even surface. Make sure
the concrete foundation has set before mounting the pump discharge head and driver base frame by allowing a curing
time of at least 48 hours.
The raised concrete base should be 200 mm larger than the mounting flange and driver base frame on all sides. (See Fig.
Nos. 03 and 04). Pipe sleeves of the foundation bolt should be 2.5times the bolt diameter embedded in the concrete.
Foundation bolt locations should be exactly as shown on the assembly drawing (showing pump, gearbox, drive shaft,
location of bolt holes for discharge head mounting flange and driver base frame) provided by manufacturer.

Fig. No. 05
Fig. No. 06
foundation bolt
grout
dam for grout
sleeve
wedge
foundation
discharge head
mounting flange
dam for grout
precision level
discharge head
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frame (dam) on the foundation enclosing an area around the discharge head base that includes all alignment wedges to
retain the grout between the base mounting flange and the foundation (refer Fig. No. 06). Recommended dam height
is approximately 1/2inch (12 mm). Follow grout manufacturer’s instructions for other grouting procedures and pour
the grouting material into the dammed-in area up to the level of dam and force it between the discharge head and the
mounting flange align with the foundation bolts. Continue to lower the pump assembly until the bolts enter the holes
in the base. Place wedges under the discharge head base mounting flange adjacent to the bolt holes, one under the each
of the four sides. For structural foundations use shims under the corners. Lower the hoist until the full weight of the
pump assembly is resting on the wedges or shims on the foundation.
Remove the slings. Hand tighten the anchor bolt nuts. By adjusting the wedges or shims and nuts on the anchor bolts,
adjust the discharge head flange center line to the correct elevation. While maintaining the correct elevation adjust the
nuts and wedges or shims to achieve the required levelness. Level the pump in two directions at 90° on the machined
top surface of the discharge head (refer Fig. No. 05). The levelness tolerance is 0.005 inches per foot. Build a barrier or

discharge head
Fig. No. 07
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Hollow shaft drive(r) refer to hollow shaft motors or hollow shaft gear drives. Clean the top end thread of the middle
line shaft, and the threads of the coupling. Apply a thin film of oil to the threads. Screw the coupling onto shaft for
half its distance. A fine wire inserted in the drilled hole at the center of the coupling can be used as a gage to
determine when the coupling is correctly positioned.
Be sure to remove the wire after installing the coupling. Upon completion of the installation pump run out should be
checked at the positions indicated in the Fig. No. 7. Attach the base of the dial indicator on the discharge head or driver
support. Place the stylus on the shaft at the locations indicated in Fig. No. 07. Rotate the shaft slowly 360°. Check that
the shaft run out is within 0.06". (1.5 mm) TIR.
5.3. Mounting hollow shaft drive(r)
After finishing the installation of the coupling, inspect the driver mounting flange of the discharge head and clean the
surface thoroughly. Remove the driver top cover cap screws and lift off the cover. Remove the top drive coupling or
clutch and the hold down bolts.
Attach a sling to the lifting lugs of the driver and hoist the driver up. Inspect the mounting surface register and clean
these surfaces thoroughly. Any burrs found on the mounting surface should be removed using a smooth mill file and
clean afterwards. Position the driver above the discharge head. Orient the terminal box of the motor or input shaft of
the right angle gear in the desired position.
Align the driver mounting holes with the respective holes on the top surface of the discharge head. Lower the driver
until the registers engage and the driver firmly rests on the discharge head and secure the driver with the provided cap
screws. Now take top shaft and position it properly over the motor quill shaft. Lower it through the motor quill shaft
to meet the middle line shaft top coupling. Apply a thin film of oil to the threads of the top shaft.
Screw the top shaft into the coupling manually until the resistance is felt. Completely tighten the joint using a pair of
pipe wrenches. Follow the alignment checking procedure described in the section 5.3and ensure the proper alignment.
Lubricate the driver bearings and make the necessary cooling line connections for gear drives. With the motor in place
and top shaft projecting through the driver quill shaft make temporary electrical connections. After removing the
foundation all around. Remove the air bubbles from grout as it is poured by puddling, using a vibrator, or pumping
the gout into place. Level off the grout flush with the top of the dam. Allow the grout to cure at least 48 hours and
after that tighten the foundation bolts.

Fig. No. 08-a
nut cap screw
cover cap screw
adjusting nut
drive coupling
top cover
hold down bolts
gib key
top shaft
rotating ratchet
ratchet ball
stationary ratchet
ball retaining ring
Fig. No. 08-a
nut cap screw
cover cap screw
adjusting nut
clutch
top cover
hold down bolts
gib key
top shaft
ratchet plate
ratchet pin
Hollow Shaft Motor Mounting Components Assembly
Hollow Shaft Gear Mounting Components Assembly
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Disconnect the temporary electrical conncetions before proceeding further. Install the top drive coupling or clutch over
the top shaft. Insert the ratchet pins. In case of ball type ratchet place the ratchet balls and install the rotating half of
the ratchet on top of that and place the ball retaining ring. Match the coupling lugs with corresponding holes in the
motor. Tighten the hold down bolts evenly, ensuring that the driver coupling is properly seated in the register fit.
Insert the gib key into the keyway. Key must fit snugly but with a sliding fit and should have a slight clearance with the
ratchet pin or balls (with rotating half of the ratchet) check the motor rotation. Motor must rotate counter-clockwise
when viewed from the top end. Refer Fig. No. 08-a and 08-b for the details of general arrangement of the driving
mechanism for hollow shaft driver.

Fig. No. 09
l
o
w
e
r
i
m
p
e
l
l
e
r
adjusting nut
r
a
i
s
e
i
m
p
e
l
l
e
r
drive coupling / clutch
r
o
t
a
t
i
o
n
shim liquid level gauge
shim
800 mm (max.)
Fig. No. 10
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small impeller clearance.
Line-up one of the holes in the adjusting nut with the nearest hole in the driver coupling (Fig. No. 09). Insert the cap
screw in the hole and tighten it.
bottom of the keyway. Care should be taken to ensure that the gib key is not too
high so as to hold up the adjusting nut from seating on the drive coupling. Install
adjusting nut to a hand tight.
Shaft adjustment up or down is accomplished by turning the adjusting nut. Before
any adjustment is made, the impellers will be resting on the lateral bowl wear
rings, and considerable resistance due to friction can be felt when turning the
shaft by hand.
To set impellers to the mid position proceed as follows: Turn the adjusting nut
in counter clockwise direction, thus lifting the shaft, until the impellers just clear
their seats and the shaft/motor/gear drive turns freely by hand. This position
at which the shaft begins to rotate is the starting position of the adjustement.
1/36 to 1/48 turns per unit length (m) of pump shaft should be made for pump
models NF-4VTP22 & NF-4VTP60 and 1/36 to 1/54 turns per unit length (m) of
pump shaft, should be made for pump models NF-6VTP115, NF-8VTP170, NF-
8VTP230, NF-10VTP285 & NF-10VTP340 further after the starting position of
adjustement. Further adjustements may be necessary after starting the pump if a
high power consumption by the pump is observed with caused diagnosed as too
5.4. Mounting Horizontal Driver (Engine or Horizontal Motor)

9
0
°
COMPANION FLANGE
DRIVER OR GEAR SHAFT
FLANGE FACE SHOULD BE
SQUARE WITH SHAFT TO
WITHIN 0.003 TIR
PILOT SHOULD BE CONCENTRIC TO BORE TO WITHIN 0.003 TIR
Fig. No. 11
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The horizontal drivers are mounted on the base frame while shipping from the factory. Use the lifting arrangement
shown in the Fig. No. 02-a for hoisting the driver assembly. Lift the driver assembly and orient it so that the holes
in the base frame align with the foundation bolts. Lower the pump assembly until the bolts enter the holes in the base.
Fit shims to left and right of the foundation bolts, between the base frame and the foundation. If the shims are more
than 800 mm apart, position extra shims equal distant between them. Lower the hoist until the full weight of the
horizontal driver assembly is resting on the shims on the foundation.
Align the driver assembly using a precision spirit level (on the base frame) as shown in the Fig. No. 10. All shims must
be perfectly flush and uniformly tighten up using securing means. Base plates have to be grouted with non-shrinking
mortar up to the upper edge of the frame after having been fixed in position.
Check flange bores and shaft diameters for proper fit. Clean all mating surfaces, bores and faces removing grease, oil,
dirt, nicks, paint and other contaminants to insure proper fit and function of mating parts. Companion flanges are
bored for a slip fit over driver and gear shafts.
Align flange key with shaft key and gently tap flange on to shaft with extreme care to avoid any damage for flange or
flange face. Tighten the set screw provided over keyway to lock flange into position.
Makes sure that the shaft at both driven end and driver end are not extended out beyond the flange face or pilot bore
boss. Check the run-out of flange face and pilot diameter. Ensure that the total indicated run out is below 0.003" (see
Fig. No. 11). In cases where fly wheel adapter disc is used for connecting drive shaft to diesel engines, instead of fitting
companion flanges on the stub shaft, this disc should be properly aligned and tightly bolted onto the engine flywheel.
5.5. Mounting Drive Shaft

drive shaft
Fig. No. 12
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The the components of the Vertical Turbine fire pumps are equipped with register fits enabling the automatic alignment of
mating parts. Nevertheless we recommend that the alignment between the driver and top shaft be checked during installation
of the driver and after the discharge piping is connected. To do the same follow the procedure described below.
Mount the magnetic base of the dial indicator on the drive plate. Place the contact point of the dial on shaft and slowly turn
rotor and check the dial indicator reading variation (Fig. No. 13).
Confirm that the shaft run out is within 0.06”. (1.5 mm) TIR. If it is not within this limit then it indicates a misalignment.
In such cases check the following possible causes:
1. Bent top shaft
2. Burrs or foreign matter between shaft ends, between driver flange and discharge head top flange, discharge head mounting
flange and foundation. (If any leveling problem is found between discharge head mounting flange and foundation it can be
corrected by shimming between them).
3. Eccentricity of vertical driver to discharge head.
5.6. Aligning Pump and Driver
Align pilot bore boss into companion flange mating diameter. Align bolt holes of drive shaft flange and companion
flange / adapter disc. Secure drive shaft to companion flange using bolts / studs with hand tight on both ends. Extend
shaft at slip section until pilot bore boss aligns with companion flange pilot bore boss. Align holes and tighten the
bolts/studs to firmly secure the drive shaft to the companion flanges/ fly wheel adapter disc.
Do the alignment as specified in the section 5.7. After the alignment lubricate all joints and slip splines. Add lubricant
to until clean lubricant appears at all four bearing seals. Disconnect the screws and separate the two halves of the
drive shaft guard. Fix the guard in place to properly cover the drive shaft and secure it with the screws.
Once the companion flanges / fly wheel disc is fixed in place, lift the drive shaft, compress it and lower it into position
between mating flanges (see Fig. No. 12).

Fig. No. 13
top shaft
dial indicator
drive plate
Fig. No. 14
top view
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5.7. Drive Shaft Alignment
Make sure that the engine crank shaft / motor shaft center line is on the same center line as the right angle gear drive shaft
when examined from the top view (Fig. No. 14) and parallel in the side view (Fig. No. 15).
The cause of misalignment should be corrected before proceeding further with the installation.
Universal joint operating angles at each end of a drive shaft should always be at least 1°. At the same time this deflection angles
θ1and θ2must be equal within ±0.5°. Shaft yokes must be aligned in phase (Fig. No. 16).
The maximum joint operating angle of 3° is recommended for optimum bearing life. Parallel offset is the recommended
method for achieving the desired angle. Measure the distance “A” and “B” as shown in the Fig. No. 17 (same unit). If the ratio
between “A” and “B” (A/B) is between 0.0175 and 0.0524 then the angle will be approximately between 1° and 3°.
Engine crank shaft / motor shaft center line and right angle gear drive shaft center line should be parallel in side view as

side view
centerlines:
parallel
Fig. No. 15
Fig. No. 16
yo
k
e
s
in
ph
as
e
θ1
θ2
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shown in the Fig. No. 15 in order for the angle θ1and θ2be equal when the angle is measured using the method described
herein. If it can not be ensured then an inclinometer, angle finder or angle locator should be used as shown in the Fig. No. 18.

Fig. No. 17
θ1
θ2
a
b
Measuring the operating angle of the rear universal joints
Read deflection
shown gauge
Inclinometer
Magnetic end of tool
centered on bearing cap
Bearing surfaces
must be clean
Preparation for checking the rear joint's operating angle
Adjusting knob
Magnetic end of tool
centered on bearing cap
Inclinometer
Bearing surfaces
must be clean
Fig. No. 18
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Water tank should provide sufficient and reliable water supply for the fire protection system. The depth of the tank should
match with the pump length and it should be confirmed by cross-checking with the pump dimensional drawing.
Ensure the proper submergence of the pump for reliable operation of the pump. The minimum submergence level is given
in the Fig. No. 19. The maximum quantity of water required for the fire fighting system at any condition, for the amount of
time for which the fire pump is designed to operate, should be above this level (i.e. this is the lowest pumping water level).
5.8. WATER TANK

Pump bowl
assembly
column pipe
Suction nozzle
Basket suction strainer
(alternate conical
strainer)
Pump water level at 150% of rated
pump capacity
Drawdown
Static water level before pumping
Minimum
submergence
(refer catlogue)
VERTICAL HOLLOW
SHAFT MOTOR
ELECTRIC FIRE PUMP
Fig. No. 19
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5.9. Delivery Piping
Ensure that bolt grouting or chemical anchors are allowed to dry thoroughly before connecting any pipe work.
Note that fire pump sets have regulatory requirements for piping and these must be strictly observed. Refer to the
appropriate standard for details. (See Fig. No. 20).
The discharge piping should be supported independently and close to the pump so that no strain is transmitted to
the pump when the flange bolts are tightened. Use pipe hangers or other supports at intervals necessary to provide
supports closest to the pump discharge head.
The distance between the bottom of the strainer and the bottom of the tank should be at least one-half of the pump bowl
diameter but not less than 12 in (305 mm). The distance between pump center line and tank wall should be more than the
diameter of bowl. Distance between the center lines of two pumps installed adjacently should be more than four times the
diameter of the bowl of the pump with largest bowl size.

Fig. No. 20
TYPICAL VT PUMP PIPING INSTALLATION
CHECK VALVE
DISCHARGE
VALVE
DISCHARGE
INCREASER
BOWL
PIPE
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Install piping as straight as possible, avoiding unnecessary bends. Where necessary use 45° or long sweep 90° bends to
decrease friction losses.
Make sure that all piping joints are airtight. Where increasers are used in discharge line it should be concentric type.
Failure to comply with this may adversely affect the performance of the pump by causing the formation of air pockets
in the pipe work.
Piping should be flushed clean before connecting to the pump.
5.10. Pressure Relief Valve
Pressure relief valve is required only for diesel engine driven fire pump sets. Pressure relief valve should be evaluated
and operated at 121% of the net rated shutoff pressure considering the pressure rating of the fire fighting system
components.

Fig. No. 21 Subject to flow meter manufacturer’s recommendations.
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5.11. Operating instructions of flow meter
The flow meter arrangement of NAFFCO pump set is built as per flow meter manufacturer’s instructions. The
operating guidelines are following (See Fig. No. 21 also):
1. Close the system OS&Y valve.
2. Open OS&Y test line valves (shown in the Fig. No. 21) or butterfly throttle valve (according to- system
requirement).
3. Purge meter located on venture as follows:
- Open shut off valves and air vent valves.
- When a steady stream of water is passing through each plastic hose, the meter is purged of
air.
- Close air vent valve after purging.
4. Open the air release valve provided upstream of the flow meter.
5. Start fire pump, read meter in gpm.
6. Refer to pump flow requirement and adjust throttle valve.
7. After test, open system valve and close system test line and throttle valves.
5.12. Pressure sensing line
»For all pump installations, including jockey pumps, each controller shall have its own individual pressure sensing
line.
»The pressure-sensing line connection for each pump is made between that pump’s discharge non- return valve and
discharge control valve.
»This line has ½” non return valve with 2.4mm hole in the clapper and will be connect in opposite direction.
»The end of pressure sensing line is connected with ball valve to drain the water.
»The pressure sensing line is intended to control automatic starting of the pump motor and the running cycle of
the fire pump.
»The pressure sensing line shall be brass, rigid copper pipe or stainless steel pipe or tube, and the fittings shall be
of ½in. (15 mm) nominal size.
»The use of soft copper tubing is not permitted for pressure sensing line because it is easily damaged.

PRESSURE
SWITCH
CONTROL PANEL BALL VALVE FOR DRAIN
2
11/2" CV WITH 2.4 MM HOLE INCLAPPER AND WILL BE CONNECTED IN OPPOSITE DIRECTION
BV
CV
TO DRAIN
1
BV
1
2
TO DRAIN
CHECK VALVE
DISCHARGE
VALVE
DISCHARGE
INCREASER
BOWL
PIPE
Fig. No. 22
17 of 46
Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
FIRE PUMPS - NF-VTP SERIES
Ref. No. NFVTP-IOM/2016/V.02
»Where the water is clean (i.e. water that is free from obstructing material), ground-face unions with non-corrosive
diaphragms drilled a nominal dia. of 0.09375 in. (2.4 mm) orifice shall be permitted in place of the check valves.
In most cases, potable water is considered to be acceptable for this application.
»Where the above requirements are not met, there shall be two check valves installed in the pressure sensing line
at-least 5ft. (1.52 m) apart with the nominal dia. of 0.09375 in.(2.4mm) dia. hole drilled in the clapper to serve
as dampening.
»There shall be a no shut-off valve in the pressure sensing line.
»Pressure switch actuation at the low adjustment setting shall initiate the pump starting sequence (If the pump is
not already in operation).
Refer Fig. No. 22 for details.
5.13. ENGINE Cooling Line
Most fire water pump diesel engine installations use water cooling systems. These fall into two categories - radiator
and heat exchanger.