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12. Pay close attention to the lowest level of the liquid in the suction tank so that air entrainment to the
suction piping will not occur.
The inflow pipe into the suction tank should be distanced from the suction pipe and positioned below the
liquid surface as a means of preventing air entrainment to the suction pipe. If air bubbles are generated in
the suction tank, install a baffle.
13. It is recommended that a vacuum/pressure gauge be installed on the suction piping approximately 6 pipe
diameters from the pump suction port.
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Discharge Piping
1. Use proper pipe supports so that the weight of the piping does not load the pump nozzle.
2. If a method other than flooded suction is used, install a special pipe for priming.
3. If the piping is very long, its diameter should be determined by calculating the piping resistance. Other-
wise, the specified performance may not be obtained due to increased piping resistance.
4. A check valve should be installed if any of the following conditions exists in the piping:
• The discharge piping is very long.
• The discharge head is 50 feet or more.
• The end of the discharge pipe is located 30 feet higher than the surface of the suction tank.
• Several pumps are connected in parallel with the same piping.
5. The installation of a gate valve on the discharge pipe is recommended for the adjustment of discharge
quantity and for the prevention of motor overload. When installing both a check valve and a gate valve,
the check valve should be positioned between the pump and the gate valve.
6. A pressure gauge must be installed on the discharge piping.
7. An air bleeding valve should be installed if the discharge pipe is very long in the horizontal direction.
8. A drain valve should be installed for the drainage of liquid if there is a chance that the liquid in the
discharge pipe will freeze.
