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5.2 Piping
5.2.1 General
1. Carry out sufficient air blowing or flushing of tubing and connectors to remove foreign matter from
inside surfaces prior to connecting them with the pump.
2. Tube connections should be done such that the extra load of piping is not applied to the pump, use pipe
supports as necessary. Supports also prevent the vibration and heat generated along the piping from
reaching the pump.
3. The connections on the piping should be assembled carefully, to prevent liquid leakage, air leakage, and
air suction.
4. Commercially available connectors and tubing may be used in the piping system. However, for the
liquid piping system, they must be designed to withstand leakage due to high temperature or heat cycle
operation as well as corrosion from the liquid and atmosphere..
5.2.2 Liquid piping
1. Pump port diameters and materials
The standard material of the pump discharge and suction port is PFA tube. The applicable tube
diameters are as follows:
Model O.D.
FA-2 3/8"
FF-10, FH-10 1/2"
FF-20, FH-20, FZ-20 3/4"
FA-40, FF-40, FH-40 1"
Use tubing, piping and connectors with diameters corresponding to those of the pump tubes. The
inside diameter of the piping connectors and tubing should be larger than those of the discharge and
suction ports if possible. Never install connectors or tubing with smaller diameters than the pump
suction and discharge tubing.
2. The length of the piping should be as short as possible. The number of bends, couplings and valves
installed along the piping should also be minimized to keep the piping resistance as low as possible.
3. Design the piping to absorb linear expansion and thus prevent thermal stress onto the pump.
Points to be observed in suction pipe arrangement
1. The suction piping should be larger in diameter than the pump port if possible, and short in length.
Iwaki America recommends the flooded suction system, if possible, for optimum performance. In the
suction lift system, determine the height according to the self-priming capacity of the pump.
* The suction height differs with the liquid's characteristics, temperature & suction pipe length.
For more detailed information, contact Iwaki America.