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 delivery volume.
(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 pump shaft from coming off center,
resulting in equipment breakage, 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 delivery 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 delivery volume 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 foreign matters such as cutting powder, dirt, or the like in the
pump section. Failure to observe this may clog the pump strainer, break the pump, or promote
the performance degradation. Perform the primary treatment by filtration with a mesh net, chip
conveyor or magnetic separator, before pump startup.
(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 if necessary.
(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.
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