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INSTALLATION, OPERATION AND MAINTENANCE MANUAL
POLARIS - SERIES TBM 75 LH ( 3" ) - TYPE PHO / PBO / PVO
DOCUMENT NBR. :
A0452
4.6.2 PRIMARY SEAL FLUSH
Polaris pumps equipped with the standard, run dry capable internal slurry seal
arrangement do not require an external seal flush or cooling. They are cooled and
lubricated by the oil contained in the seal chamber.
The seal flush / cooling water for the available outboard mechanical seal options is
automatically supplied if the pump is running. Be aware that if pumps equipped with
outboard seals are operated in applications where the sump can be pumped dry, a
minimum water level must be present to prevent the mechanical seal from dry
running. If the sump level falls below the minimum requirement, the higher than
normal seal temperatures could cause the outboard seal faces to crack due to
thermal shock once the sump water level rises back and quenches the hot seal
faces.
Refer to the general arrangement drawing of your pump (Section 8.0) for the
minimum sump level requirement and install suitable level controls.
4.6.3 OPTIONAL WATER JACKET / PIPING
Unless equipped with a continuous dry run rated motor, an optional water jacket
must be installed if the pump is operated in applications where the sump can be
pumped dry below the minimum water level and the pump remains running under
full load for periods exceeding 15 minutes. This is to prevent overheating and
subsequent burnout of the stator windings.
Water must be clean so that no sand, etc., is pumped into the water jacket.
REVISION:
Cooling water should be 5 GPM at 35 P.S.I. maximum pressure at a
temperature not exceeding 40
EFFECTIVE
4
DATE:
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C (104
10of 30
01-17-2006
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F).
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