IMMERSIBLE MOTORS0 pages

CORNELL PUMP COMPANY

IMMERSIBLE
the ImmersIble motor concept:
Immersible motors are designed to be used in dry-pit applications where
there is a possibility of flooding. Why take a submersible motor that was
designed to run submerged 100% of the time and modify it to run in air
99% (or most of the time) and submerged 1% of the time (in case of a
flood)? This seems backwards. The correct approach is to take a TEFC
motor that is designed to run in air 100% of the time and adapt it to run
submerged 1% of the time (in case of a flood).
ImmersIble motor basIc desIgn:
The basic design of the immersible pump/motor incorporates a premium
efficient, inverter duty, P-Base or C-Face TEBC motor (totally enclosed,
blower cooled). The motor, as the name implies, is totally enclosed
and cooled by a blower on top of the motor. If the motor becomes
submerged, the blower motor fan shuts down without affecting the
main motor. While the motor is temporarily submerged, the media cools
the motor just like a true submersible. A special conduit box is used to
prevent water leakage into the motor. The motor is designed to prevent
infiltration of water along the shaft and into the motor by utilizing a triple
redundant sealing system, including a patented hydroseal design. The
motor-end bell housing incorporates the ‘inverted cup’ principle, which
traps an air bubble under the
motor as water rises, thus
keeping water away from the
shaft seal. The shaft is fitted
with a hydroseal, which expells
water and further reduces the
chance of water reaching the
shaft seals.
The Immersible motor can
withstand up to 30 feet of
submergence depth for a twoweek period. This exceeds the
requirements of Immersible
motors that is described in the
industry standard “Index of
Protection” IP67. Competitive designs only allow immersion
of the motor for a period of time not exceeding 30 minutes
at a submergence level of 3 ‘. Hardly enough time to deal
with any kind of flooding emergency!
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