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Good
No Good
(5) Sink the suction pipe end in the liquid of suction tank by depth of 500mm or double of pipe diameter.
(6) Install a reducer in case the pump suction port bore is not the same as suction pipe diameter. Install the reducer so
that the upper part becomes horizontal as shown above. Do not use the suction pipe of which the diameter is
smaller than pump suction bore.
(7) If slurries or foreign matters possibly get into, install a strainer at the end of suction pipe.
(8) Install a compound gauge near to pump to check the excessive vacuum due to clogging by foreign matters.
(9) Take any measure for the foreign matters not to get into the suction tank. Foreign matters may cause pump failure.
Keep sufficient distance between the end of suction pipe and the bottom or side wall of suction tank or liquid
surface.
(10) In case of severe suction condition (pressure of suction tank is lower than atmospheric pressure, suction lift is high,
long suction side piping), it is recommended that NPSH available value is larger than "1.2 x NPSH required value".
(11) In case of suction lift application (Pump sucks up liquid.), prime the pump when the pump is operated for the first
time.
(12) In case of suction lift application, incline the suction piping ascending towards pump so that no air pocket is made
in suction piping.
(13) In case of flooded suction (Pumps suction port is below the liquid level.), it is recommended that the valve is
installed in suction piping so that the maintenance works can be done easily. Always open this valve during pump
operation because it is installed for maintenance works only.
