3-5
(2) Be sure to provide pipe supports so that the weight of pipes is not applied directly to the pump
main body.
(3) The suction pipe must be made as short and straight as possible.
(4) Bends must be as far from the suction port of the pump as possible with maximum bend radius.
(5) Carefully attach joints and other parts to the suction pipe to block air suction.
(6) The suction piping should be corresponding to or larger in diameter than the pump port (a size
larger as a guide). In case, for lifting operation, you use a suction pipe with larger diameter than
that of the pump suction port, attach an eccentric reducer to prevent air from being trapped. Also if
you use a suction pipe with smaller diameter than that of the pump, it may cause cavitation.
Note
For the models with pump suction
diameter of 80, 100, and 125mm,
the suction piping should be a size
larger in diameter than the pump. If
you use a suction pipe with smaller
diameter than that of the pump, it
may cause cavitation.
(7) For boost operation
・
Be sure to attach a sluice valve to the suction pipe.
・
Install a strainer at the suction side of the pump to
block the entrance of foreign matter and other
objects (such as cutting chips, sand, rust, and scale)
to the pump. (Recommended mesh size for the
strainer: 40 mesh for normal use, 80 mesh for
cleaning)
(8) For lifting operation
・
The suction pipes should be as short as possible with minimum bends. Do not attach a sluice
valve to the suction pipes. Do not install the piping with a shape of upward bend (i.e. providing
the piping with a rising gradient and then a descending gradient).
・
To prevent air from being trapped inside the suction pipe, provide a rising gradient (at least
1/100 degrees) leading up to the pump.
・
If you use a suction pipe whose bore is larger than that of the suction port of the pump, use an
eccentric reducer to prevent air from being trapped. The diameter of the suction pipe can be up
to 2 sizes larger than that of the pump. (e.g. If the suction port bore of the pump is 40A, the
suction pipe bore must be 50A or 65A.) If the diameter of the suction pipe is too large, the foot
valve might not open or bubbles may easily generate inside the suction pipes due to the
increased amount of the dissolved oxygen.
Caution
Be sure to provide pipe supports for the pipes. Otherwise, the main shaft
may be displaced from the center, thus leading to the equipment damage,
vibration, or noise.
Discharge
Suction
Strainer
Pump
Check
valve
Sluice valve
Drain valve
Vibration
isolation joint
Construction example
