3-6
・
Attach a foot valve with a strainer to the end of the suction pipe to prevent entry of foreign
objects. Immerse the foot valve in water and set it at a depth of at least twice the diameter of the
pipe from the surface of water to prevent the suction of air. In addition, ensure that it is set
above 500 mm or more from the bottom of water.
(9) Attach a sluice valve and a check valve to the discharge pipes. If water hammer may occur, attach
a buffer type check valve.
(10) If there is an upward curve in the discharge pipe, ensure that air can be vented from the section.
(11) If two or more pumps are used for lifting operation, every pump should have its own separate
suction piping.
(12) If you take heat insulation measures for the pump, be sure to avoid the motor section. Otherwise,
the motor may heat up and ignite. Furthermore, since the mechanical seal needs to be replaced
periodically, install detachable insulation for it.
Warning
Never install heat insulation to the motor section. Otherwise, the motor
may heat up and ignite.
(13) On completion of the piping work, be sure to clean the inside of the receiver tank. Pay attention
not to contaminate the system with foreign matter.
(14) The shaft could get misaligned during installation due to the piping weight or fastening work of
anchor bolts. Check the alignment and re-align it after the installation is complete, referring to “3-3.
Installation procedure (8).”
Caution
・
Properly set a strainer so as not to suck air in.
In addition, ensure that it is set above 500 mm
or more from the bottom of water.
Caution
In case of using a foot valve:
・
Properly install the foot valve vertically. If the
valve is not vertical, it does not open or close
properly, which comprises the function of the
foot valve.
・
Immerse the foot valve in water and set it at a
depth of at least twice the diameter of the pipe
from the surface of water to prevent the suction
of air. In addition, ensure that it is set above
500 mm or more from the bottom of water.
Caution
If two or more pumps are used for lifting operation, every pump should have
its own separate suction piping. Otherwise, air may be sucked from the
inactive pump during single-pump operation, thus preventing water from
being pumped.
Caution
Improper alignment may lead to machine damage, vibrations, or noise.
Ensure to achieve accurate alignment.
Sluice valve
Min. 2D
Support
Construction example
Check
valve
Support
Pump
Gradient
Min. 1/100
1 to 1.5D or larger
Min. 500mm
Support
Support
Strainer
