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INSTALLATION, OPERATION AND MAINTENANCE MANUAL
POLARIS - SERIES TBM 200 LH ( 8” ) - TYPE PHO / PBO / PVO
10of 29
DOCUMENT NBR. :
PED-010
REVISION:
1
EFFECTIVE
DATE:
08-24-2004
4.6.2 PRIMARY SEAL FLUSH
The seal flush / cooling water to the outboard mechanical seal is automatically
supplied if the pump is running. Be aware that if the pump is 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 can cause the 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
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 for periods exceeding 15 minutes. This is to prevent
overheating and subsequent burnout of the stator windings.
Cooling water should be 3 GPM at 60 P.S.I. maximum pressure at a
temperature not exceeding 40
◦
C (104
◦
F).
Water must be clean
so that no sand, etc., is pumped into the water jacket.