Grundfos MS 4000, Руководство по эксплуатации продукта

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Example 1:
A six-inch motor and pump that delivers 60 gpm will be
installed in a 10” well, 90 gpm past the motor is required
assuming 10” ID well (from Table 1). An 8” or smaller
sleeve must be added to the pump to provide a cooling
flow velocity of 0.5 fps or greater. 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 as shown in Figure 6.
Typical Motor Jacket Installation Scenarios
Fig. 6 Motor Jacket Installation
The table shows the recommended number of starts of intermittent operation:
Special (Non Water Well) Applica-
tions
A cooling shroud should be used in all static horizontal
and vertical installations where water can directly enter
the pump intake, without crossing the motor surface. In
addition to focusing the pumped fluid to dissipate motor
heat, a motor shroud can be used to improve suction
conditions by reducing vortices. Such applications
include fountains and pump-out tanks, where the
ambient fluid temperature is often higher than ground-
water temperatures.
In such installations; motor submergence-temperature
considerations, as well as pump intake requirement
must be carefully considered.
Intermittent Operation
A typical horizontal pump out tank application is illus-
trated in Figure 7. Vertical application should be
handled as illustrated in Figure 8, which is analogues to
top feeding water well application.
Typical Flow Inducer Sleeve Cutaway View
Motor type Recommended number of starts
MS 402 - 4" Min. 1 pr. year
MS 4000 - 4" Max. 100 pr. hour
MS 6000 - 6" Max. 300 pr. day
Mechanical Installation
MS Motors
MS.book Page 22 Wednesday, January 26, 2005 3:25 PM