SBI/SBN Vertical Multistage Centrifugal Pumps
5
WARNING:
If the pump is installed in a location where it is subject to freezing when not in operation, then the pump
and the pipe system
should be drained to prevent damage from freezing.
7.2 Others (Only for SBI, SBN 1, 3, 5 series)
— For these pumps, it is advisable to open the bypass
valve during start-up. The bypass valve connects the
suction and discharge sides of the pump, thus making
the filling procedure easier. When the operation is
stable, the bypass valve can be closed.
— If the pumped liquids contains air, it is advisable to
leave the bypass valve open if the operating pressure
is lower than 6 kg/cm
2
If the operating pressure
constantly exceeds 6 kg/cm
2
the bypass valve must be
closed. Otherwise the material at the opening will be
worn because of the high liquid velocity.
