13
Installing / piping precaution
1. Installing precaution
(1) If a large amount of air enters in pumps, it does not pump properly and causes a breakdown.
⚫
The suction pipe is the state of the negative pressure. If air enters for the connection installing
failure, liquid is not pumped, and the temperature of priming liquid is raised. It may cause the
pump damage.
⚫
Use the suction pipe whose bore is the same as the suction inlet. Do not use the pipe which is
bigger than the suction inlet, because it may cause the self-priming ability decline or failure.
(2) Place a strainer at the suction inlet to prevent foreign objects from entering the pipe. However, clean
the strainer periodically to prevent clogging and minimize loss resistance.
(3) It is recommended to place check valves on the discharge pipe
to prevent “water hammer”. At the
bottom, place a bypass for air exhaust.
⚫
The discharge pipe is long or the capacity is 10m (30ft.) and more.
⚫
The tip of the discharge pipe is 9 m (27 ft.) and more from the liquid level in a suction tank.
⚫
Two or more pumps that are parallel to one another are used.
(4) Create bending sections or expansion joints on the piping to prevent pump deformation and liquid
leakage caused by thermal expansion of pipe.
(5) The inside of the pump is mainly made of resin. Do not create any impact.
(6) Arrange the pipe flange and the pump flange parallel to one another and do not tighten the bolts
excessively. Bolt: M16, Recommended tightening torque: 19.6N
・
m or 200kgf
・
cm (14.45lbw-ft)
(7) When installing, fit the dimension of the pump. If not, the casing may be damaged.
(8) When using the pump outside, use the water proof cable at the service entrance to prevent rain into
the terminal box.
2. Do not apply piping load.
(1) Install the piping support to apply the piping load completely.
(2) When high temperature liquid ( 40
℃
(104
゜
F) and more),
create bending or expansion joints in the pipe to prevent the
pump from load for heat expansion.
(3) Prevent to use metal pipes as much as possible and use resin
pipes.
*Using metal pipes for strong sulfuric acid or caustic soda is
usual. Especially, follow the prohibition (2) and (3).
3. Drain Ditch
(1) Arrange drain ditches as liquid leaks flows to a wastewater pit.
(2) If not, set a drain pan.
4. Precaution before priming liquid
After pouring priming liquid, tighten the priming water plug
firmly. If the pump is operated with loosen O-ring, it may cause
self-priming failure.
Model
Min. priming liquid
20*GV1
0.6L/0.15 gal
250*GV(F)*
2.0L/ 0.52gal
400*GV(F)3
3.0L/ 0.79gal
500*GV(F)3
4.0L/ 1gal
