MOTOR INFORMATION
Typical Motor Jacket/Shroud Configurations.
The motor shroud is generally of the next nominal diameter of standard pipe larger than
the motor or the pump, depending on the shroud configuration used. The tubular/pipe
material can be plastic or thin walled steel (corrosion resistant materials preferred). The
cap/top must accommodate power cable without damage and provide a snug fit, so that
only a very small amount of fluid can be pulled through the top of the shroud. The fit
should not be completely water tight as ventilation is often required to allow escape of the
air or gas that might accumulate. The shroud body should be stabilized to prevent rotation
and maintain the motor centered within the shroud. The shroud length should extend to a
length of 1-2 times the shroud diameter beyond the bottom of the motor when possible.
Shrouds are typically attached immediately above the pump intake or at the pump/column
correction.
A typical motor sleeve/shroud selection example is sited below and illustrated in Figure 8:
If a well feeds water from above the pump, has a casing/chamber too small to allow a
motor jacket/sleeve on the pump, and does not have adequate level and flow to allow
raising the pump above the inflow, it is difficult to properly cool the motor. When possible,
the casing depth should be increased to allow flow to come from below the motor. If this is
not practical, adequate flow past the motor can usually be attained by employing a motor
jacket with a stringer pipe or by using a jet tube.
Figure 8: Typical Motor Jacket Installation Scenarios
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