Teral NSVM Series Installation instructions

Installation & Operating Manual
VERTICAL MULTI-STAGE
CENTRIFUGAL PUMP
NSVM NSVMN

NSVM,
NSVMN
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WARNING
WARNING
1.Identification code and Nameplate
1.1 Identification code
1.2 Nameplate
1.Pump Model
2.Shaft seal code
3.Frequency
4.Rated Power
5.Speed
6.Maximum Head
7.Capacity
8.Head Range
9.Maximum Operating Pressure/ Temperature
10.Rotating Direction
11.Manufacturing Month and Year
12.Serial number
2.Handling
Read these instructions carefully before beginning installation. Lift and handle these pumps carefully. NSVM,
NSVMN series are vertical multi-stage non-self priming pumps coupled with standard electric motors. This manual
applies to standard version pumps and for standard applications. Contact your supplier or the factory for information
about special pump versions and applications.
3.Applications
NSVM, NSVMN series in-line pumps booster pumps are designed for a wide range of applications in various
industries – for water treatment, water boosting, water supply, cooling, cleaning, etc.
The pumps are designed for use with clean, viscous and non-explosive liquids that do not contain abrasive matter.
These pumps are not designed to be used with abrasive, solid containing, explosive and corrosive liquids.
For special application, please contact your supplier or the factory.
4.Technical data
4.1 Temperatures
Ø Ambient temperature: 0°C to +40°C
If ambient temperatures are above +40 degrees C, or if the pump is located at elevations more than 3280 ft above sea level, the
motor’s output must be decreased to compensate for less effective cooling, and may have to be replaced with a stronger motor.
Ø Liquid temperature: -15°C to +120°C
4.2 Maximum operating pressure
Ø Refer to page 7

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WARNING
warranty.
WARNING
4.3 Minimum inlet pressure-NPSH
Ø To avoid cavitation, make sure that there is a minimum pressure on the suction side of the pump.
NPSHA (Net Positive Suction Head Available)
--The net positive suction head available is a function of the pump
suction system.
NPSHR (Net Positive Suction Head Required)
--The net positive suction head required is a function of the pump
design at the operating point on the pump performance curve.
NPSHA=Ha-Hs-Hf-Hv-Hst (in Feet head)
Ha: Barometric pressure.(That can be set to 33 ft)
Hs: Suction lift.
Hf: Friction loss in suction pipe.
Hv = KT+KH: Vapor pressure
KT: Flow resistance due to liquid temperature.
KH: Flow resistance due to elevation above sea level.
If the liquid is water, you can consult the tables to determine the
values of KT and KH.
T(°C) 20 30 40 50 60 70 80 90 100
110 120
KT (ft)
0.656 1.312 2.624 4.264 7.216 10.824 16.4 24.272 36.08 49.2 72.16
H(ft) 0500 1,000 1,500 2,000 2,500 3,000
KH (ft) 01.804 3.608 5.412 7.216 9.02 10.824
Hst: Safety margin. (minimum: 2 ft head)
NPSHA ≧NPSHR: Pump running will be fine.
NPSHANPSHR: The pump will be dry running or cavitating.
Stop operation of the pump if cavitation occurs. Cavitation will cause pump dam age and the resultant dam age is not subject to
4.4 Minimum nominal flow rate
To prevent overheating of the internal pump components, the pump should not be used at flows below the minimum flow rate.
Do not run the pump against a closed discharge valve for longer than a few sec onds.
The curve below shows the minimum flow rate as a percentage of the nominal flow rate in relation to the liquid temperature.
4.6 Electrical data
See the motor nameplate.
WARNING Make sure that the supply voltages, phase and frequencies correspond to the motor specifications.
4.7 Number of starts per hour
Motors up to and including 5.5HP: Maximum 100 times per hour.
Motors of 7.5 HP and up: Maximum 40 times per hour..
WARNING If you use another brand of motor then check the manufacturer’s instructions for the maximum frequency of starts.
＜

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5.Installation
Always refer to the local or national regulations and codes relating to the selection of the installation site, the water and power
connections, etc.
5.1 Position
Pumps should be installed in a protected environment – not exposed to weather.
Make sure that there are no obstructions to prevent proper motor cooling.
5.2 Anchoring
The pump must be secured to a solid foundation by bolts through the holes in the flange or base plate.
An illustration of page 10 shows the bolt location and the pipe connections.
5.3 Installation example
When positioning and installing the pump, follow the installation examples in order to avoid damaging the pump.
Pos. Description
1 Pipe support: Support piping system properly to avoid stresses on connections.
2 On-off valves: Install on-off valves for easy access- before the pump intake and after
the pump discharge.
3 Use flexible piping on both input and output sides of the pump to reduce vibration and
transmission of noise.
4 Check valves will prevent return flow of pumped liquid when pump is stopped, reducing
the danger of pump damage.
5 Control Panel: Use high quality components. Make sure that the panel conforms to
local standards and regulations.
6 Do not place elbows next to the pump intake and discharge.
7 If pump needs to be operated with on-off valve closed, install a by-pass line to avoid
damaging the pumping system.

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WARNING
8 If it is necessary to increase the diameter of the suction pipe, place an eccentric reducer
between the check valve and the flexible pipe section.
9 Using elbows will increase the flow resistance. Wide bends will result in lesser flow resistance.
10 The piping must have a level or positive gradient to prevent the formation of air pockets.
11 The diameter of the drop pipe must be bigger than the diameter of the pump’s suction port.
12 Use a foot valve in case of negative suction head.
13 Size pump for correct head.
14 Place the intake of the suction pipe so that the intake is always submerged to prevent entry of air.
15 Install a compound gauge at the pump suction and a pressure gauge at the pump discharge.
6.Electrical connection
Ø All electrical connection should be in accordance with the local regulations and made by a qualified electrician.
Ø Make sure that the supply voltages and frequencies, and phase are suitable for the motor used.
Ø Before proceeding, make sure that all the connections are grounded and well insulated.
Ø Overload protection should be provided.
Ø To connect, proceed as shown on the inside of the terminal board cover.
Ø The terminal box can be turned to four positions.
Ø Check the direction of rotation (Three-phase motor only).
Ø Make sure that the controls are properly grounded.
Ø To avoid the possibility of dry running, we strongly recommend installing dry running protection.
7.Start-up
The pump and suction pipe should be filled with the liquid to be pumped before start-up to prevent dry running at start-up.
Dry running can damage the pump bearing and shaft seal.
7.1 Operation
Ø Start the pump and check the direction of rotation of the motor (Three –Phase motors).
Ø Start the pump, keeping the on-off valve of the discharge side of the pump closed. Then, open the on-off valve slowly. The
pump must run smoothly and noiselessly. If not, then it may be necessary re-prime the pump.
Ø Check the current drawn of the motor. If necessary, adjust the setting of the thermal relay.
Ø Any air pockets trapped inside the pump may be released by adjusting the air screw.
If the pump is installed in a location where it is subject to freezing when not in operation, then the pump and the pipe system
should be drained to prevent dam age from freezing.
WARNING

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7.2 Others (Only for NSVM, NSVMN 25L, 25, 32 series)
Ø For these pumps, it is advisable to open the bypass
valve during start-up. The bypass valve connects
the suction and discharge sides of the
pump, thus making the filling procedure easier.
When the operation is stable, the bypass valve can
be closed.
Ø If the pumped liquids contains air, it is advisable to
leave the bypass valve open if the operating pressure
is lower than 85.32 PSI. If the operating pressure constantly
exceeds 85.32 PSI, the bypass valve must be closed.
Otherwise the material at the opening will be worn because
of the high liquid velocity.

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WARNING
switched off.
8.Maintenance
Before starting maintenance work on the pump, the motor, or other parts of the system, make sure that the power supply has been
Ø The pump does not have a recommended scheduled maintenance schedule.
Ø If the motor is fitted with grease nipples, then the motor should be lubricated with a high temperature lithium-based grease.
If not, then the motor does not require regular maintenance.
Ø If the pump and motor are used infrequently with long intervals of non-operation, then we recommend that the motor be
greased.
Ø Coupling adjustment: Refer to page 11 to 12.
9.Troubleshooting
Fault Probable cause Possible Solution
a. Supply failure or no power supply. Check connections or restart the power supply.
b. Main contacts in motor starter are not making contact or the
motor coils are defective Reconnect or replace contacts or magnetic coil.
c. Pump or auxiliary circuits protection fuses blown. Replace fuses.
d. Pump or piping system may be obstructed causing a jam. Clean the obstruction and restart pump.
e. Motor may have failed. Replace the motor.
f. Motor protector or thermal relay has tripped out. Reset the motor or thermal protector.
Pump does not run
when the motor starter
is activated.
g. Tripping of anti-dry running protection. Check the water level in the tank or the water system
pressure. If everything is in order, check the protection
device and its connection cables.
a. Overload setting is too low. Set the motor starter correctly.
b. The cable connection is loose or faulty. Fasten or replace the cable connection.
c. One fuse is blown. Replace fuse and try starting again.
d. Pump is jammed by an obstruction Check and clean obstruction from system.
e. Contacts in overload are faulty. Replace motor starter contacts.
f. The motor winding is defective. Replace the motor.
Starter overload trips
immediately when the
power is switched on.
g. Low voltage (Especially at peak time). Check the power supply.
a. The voltage is not within the motor’s operating limits. Check the operating conditions of the pump.
b. The control panel is situated in an excessively heated area
or is exposed to direct sunlight.
Protect the control panel from heat sources and from the
sun.
The pump starts
but, after a short time,
the thermal protector
trips out or the fuses
blow. c. A phase in the power supply is missing. Check the power supply.
a. Worn motor bearings causing motor to overheat. Replace motor bearings.
b. The pump’s delivery rate is higher than the specified rate on
the pump nameplate.
Partially close the on-off valve located discharge side until
the delivery rate returns to within the specified limits.
c. There are obstructions inside the pump or pumping system. Disassemble and clean the pump and piping.
The pump starts up
but, after a
period of time, the
thermal protector trips.
d. Less viscous liquids may cause the motor to work too hard
and overload the motor, causing the motor to overheat.
Check the actual power requirements based on the
characteristics of the liquid being pumped, and replace the
motor accordingly.
a. Pump is not primed with liquid. Fill the pump with the liquid to be pumped.
b. The pump, suction or discharge pipes are blocked by solids
in the liquid being pumped. Clean the pump, suction or discharge pipe.
c. The foot or check valve is blocked or has failed. Replace the foot or check valve.
d. The suction pipe leaks. Repair or replace the suction pipe.
e. The air is in the suction pipe or pump. Remove trapped air from system..
Pump runs but no
water delivered.
f. Motor operating in wrong direction (three-phase motor). Change the direction of rotation of the motor
by reversing motor connections.
a. The pump draws in air or the inlet pressure is too low. Improve the suction conditions.
The pump capacity is
not constant. b. The pump or the suction side of the piping system partly
blocked by foreign bodies.
Clean the pump or suction pipe.
The system's general
protection cuts in. Short circuit. Check electrical system.
a. The foot or the check valve has failed. Check and replace check valve.
The pump rotates in
the wrong direction
when switched off. b. Leakage in the suction pipe. Repair or replace the suction pipe.

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Fault Probable cause Possible Solution
a. Leakage in the foot valve, check valve or system. Repair or replace the components.The frequency of
Pump start-up is
too high. b. Ruptured membrane or no air pre-charge in surge tank. See relevant instructions in surge tank’s manual.
a. Cavitation
Reduce the required flow or improve the operating
conditions of the pump (suction conditions, head, flow
resistance, liquid temperature, viscosity,…etc.).
b. Make sure that pump and motor shafts are properly aligned Adjust the pump and/or motor shafts.
c . Worn motor bearings Replace the bearings or the motor.
d. Operation with frequency converter Consult a qualified engineer form the supplier of the
frequency converter.
Vibration and
noise
e. Check vibration and noise damping devices Replace vibration & noise dampers, if worn.
Maximum Operating Pressure and inlet Pressure

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NSVM (N) 25L, 25, 32 Coupling adjustments

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NSVM (N) 40, 50, 50B Coupling adjustments

Teral Pumps and Fans North America Ltd.
2380 United Boulevard, Coquitlam, B.C., V3K 6A3, CANADA Tel: [phone] Fax: [phone]
Email: [e-mail]
TERAL ASIA LIMITED
Room 1001, 10/F., Olympia Plaza, 255 King’s Road, North Point, Hong KongTel: [phone] Fax: [phone]
E-mail: [e-mail]
TERAL INC.
Head Office.230, Moriwaki, Miyuki-cho, Fukuyama-city, Hiroshima, 720-0003, Japan Tel.[phone] Fax.[phone]
Tokyo Office.TERAL Koraku Bldg., 2-3-27, Koraku, Bunkyo-ku, Tokyo, 112-0004, Japan Tel.[phone] Fax.[phone]
TP-363-00