NMM Series
7
5. Close the suction and discharge exits with gasket
6. Spray an anti-corrosive into the pump casing.
7. Rotate the pump shaft by hand once in every month,
in order to protect it from freezing and to lubricate the
bearings.
6. ASSEMBLY / INSTALLATION
NMM type close coupled pumps are mounted to the
ground by foots of the volute and also fixed to the
ground with a supporting pedestal at the bottom of the
motor.
6.1. Location of Installation
Pump shall be installed in a location where the control
and the maintenance of the pump are easily made. The
pump room shall be suitable for operation of lifting
systems such as freight elevator, forklift, etc.
The pump group should be installed in the lowest
possible location of the pumping system in order to
achieve the highest suction pressure.
6.1.1. Location of Installation- Local Ambient Temperature
When the local ambient room temperature exceeds
+40°C in a pumping system, suitable ventilation should
be provided in order to remove the heat dissipated to
the environment and supply fresh air.
6.2. Fixing (Securing) Of Pump Group
After the alignment of the pump group on the founda-
tion has been made, the mutual securing bolt screws
should be used alternately to fix the pump group.
Figure 3:
A typical Concrete Foundation
After the pump has been fixed, mount the
guard. According to the accident prevention
regulations, all preventions and protective
devices related to rotating parts shall be in their
intended place and in operational form.
6.3. Piping
6.3.1. General
• Do not use the pump as the hinged support for the
piping system.
• Put enough supports under the piping system in order
to carry the weight of the pipe and fittings.
• Avoid piping system loads on pump by installing
flexible components (compensator) to suction and
discharge of the pump.
• By mounting flexible supporting items, take into
consideration the fact that these items may elongate
under the pressure.
• Suction pipe shall be in a constantly increasing slope
to the pump. Air in the suction pipe shall be arranged to
move into the pump
• Discharge piping shall be in a constantly increasing
slope to the reservoir or discharge point, without up and
downs which can cause air pockets in the piping
system. At locations where forming of air pockets is
possible, special items like air valve and air cock are
mounted to evacuate the trapped air.
• It is important that pipe diameter and fittings are at
least as much as the pump opening diameter or
preferable one or two size higher. One should never use
fittings with smaller diameters than the pump exit
diameter. In particular, preferred fittings like foot valve,
strainer, filter, check valves and valves shall have large
free passing area, and low friction loss coefficient.
• For piping systems with hot liquids, thermal
expansions are to be taken into account and compensa-
tors shall be mounted in accordance with these
expansions. Caution shall be exercised to avoid the
loading of pump in this installation.
6.3.2. Specification of Work in Piping Installation
In installation of pipes, follow the procedures below
certainly.
• Install the pump on the concrete base as illustrated in
Figure 3.
• Take out the guards (placed by the manufacturer) from
suction and discharge openings of the pump.
• Close the suction and discharge flanges with rubber
gaskets. This precaution is important to avoid the
undesired substances (weld crust, weld slag, sand,
stone, wood piece etc.) get into the pump. Do not take
off this gasket until the installation is completed.
