3-4
3.4 Precautions for piping work
(1) The pipes should be as short and straight as possible (with minimal joints and valves). Use pipes
whose bore size is equal to or larger than that of the pump. Piping which is thin and has many
bends may decrease the discharge rate.
(2) Be sure to provide pipe supports so as to prevent the weight of the pipes from acting on the pump
body.
Caution
Avoid the weight of the pipes from acting on the pump.
Failure to observe this may cause the main shaft from coming off center,
resulting in equipment damage, vibration and noise.
(3) Do not forcibly screw the pipe into the pump. Doing so may break the joint.
(4) Lay the pipes securely in such a way that the pipe connections are kept completely airtight without
leakage. Prevent liquid leakage and air leakage by use of seal tape, liquid packing or other means.
The seal tape should be wound reliably so as not to block up the piping.
(5) Use a tank (oil tank) with as larger a capacity as possible.
* A recommended capacity is at least three times the discharge volume per minute.
Too small a capacity may cause problems such as causing the liquid temperature to rise up,
causing the strainer to get clogged with cutting powder, and causing the discharge rate to
decrease due to the occurrence of air bubbles.
When pouring a liquid used into a tank (oil tank), slowly pour air so as not to trap air in.
(6) Do not allow a large amount of cutting powder, dirt, or other contaminants to get into the pump
section. Failure to observe this may clog the pump strainer, damage the pump, or significantly
deteriorate the performance. Use liquids that are subjected to secondary treatment through a net
cage, a chip conveyor, a magnetic separator, etc.
(7) If water hammer may occur, attach a pressure damper (e.g. accumulator).
(8) The companion flange type pump is packaged with a companion flange for the discharge port.
Use it as needed. When using the flange, be sure to install the supplied O-ring.
(9) If there is an upward curve of the discharge pipe, ensure that air can be vented from the section.
(10) If you provide an escape pipe on the pump discharge side, provide a sluice valve in the middle of
the escape pipe to adjust the relief volume.
Note
If the amount released from the escape pipe is too much, the temperature
of the liquid in the tank (oil tank) comes to rise easily.
(11) On completion of the piping work, clean the inside of the tank (oil tank) to prevent the suction of
foreign matter.
3.5 Precautions for wiring work
Danger
Use high-quality wiring equipment and devices, and carry out wiring work
safely and securely according to the technical standards for electrical
facilities, as well as the indoor wiring regulations.
Only qualified personnel such as licensed electrical engineers are allowed
to carry out electrical wiring work. Unqualified persons are prohibited by
law to carry out wiring work, and it is very dangerous.
