10
Be careful that pump is not to be
influenced with thermal stress of piping
when transferring hot liquid or cold liquid.
Don’t make U shaped bend in the piping
when transferring easily precipitable slurry.
Install a flushing pipe line for maintenance
and inspection when transferring viscous
liquid,
poisonous liquid, or coagulative liquid.
Choose the piping material that has
sufficient corrosion resistance to the liquid
and can endure the pressure applied in the
piping.
Connect piping after flushing the inside of
piping cleanly and remove the inspection
sticker for preventing entrance of foreign
substance on the discharge port.
Protect the piping with insulating material
or keeping warm device, if the liquid may
freeze inside of piping. In addition, Install
drain valve at the suction & discharge side
in order to drain the
liquid inside piping after operation stopped.
9-3 Suction Piping
Suction piping is made with drop method as far as possible. Also, the diameter of the suction
piping should be larger than or same with the suction diameter of the pump.
Carefully connect the joint of suction piping in order to prevent air inflow into the piping.
Discharge rate of pump can be destabilized by air Inflow into the piping.
Make piping length of suction side as short as possible. If it is too long, cavitation occurs and
regular discharge rate can‘t be assured.
Install a strainer on the suction piping because it make unstable performance that foreign
substances flows into pump head.
9-4 Discharge Pipe
Safety valve should be installed at a place near to discharge pipe of the pump and do not install
any other valves between the pump and the safety valve.
Use a discharge pipe of which internal pressure is higher than the set value of the safety valve.
Also, carefully fit the joint of the discharge pipe.
If discharged at the pressure below than atmospheric pressure, keep the pipe end higher than the
water level of the tank or install the back pressure valve to prevent siphon phenomenon.
(The pulse rate could be increased after installing the back pressure valve, so consult an expert
before installing it.)
Install pressure gauge for daily inspection of the discharge pressure.
9-5 Electrical Wiring
Warning
•
Do not touch with wet hands. Electric shock may occur.
Safty Valve
Pressure
Pressure
Suction
Discharge
Drain Valve
Pump
Drain Valve
Y-Straner
TANK
Valve
Relief Valve
Gauge
Valve