Raymarine FA-2E General, Liquid piping, Points to be observed in suction pipe arrangement

5.2Piping

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

FA-2

FF-10, FH-10

FF-20, FH-20, FZ-20

FA-40, FF-40, FH-40

O.D.

3/8"

1/2"

3/4"

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.

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