Xylem IMVS R01 Model VS Vertical Industrial Turbine Pumps - Manual (Page 6)

6
SECTION 4 — PREPARATION FOR
INSTALLATION
4–1 WELL REQUIREMENTS
1. The well should be developed with a test pump prior
to installing the submersible pump. Test pumping the
well serves several purposes. It removes the excess
sand encountered during the initial pumping of the
well. Pumping sand or other abrasives with a submers-
ible pump will shorten the life of the pump and can
void the warranty.
DO NOT INSTALL THE UNIT WITH
THE MOTOR IN THE MUD, SAND
OR RESTING ON THE BOTTOM OF THE WELL.
IT IS IMPORTANT TO PREVENT THE WELL FROM
SANDING UP AT ANY TIME TO THE POINT THAT
THE MOTOR BECOMES EVEN PARTIALLY BUR-
IED.
2. The test pumping also provides a means of determin-
ing the capacity and drawdown. The well capacity
should equal or exceed the pump capacity. If the pump
removes water at a higher rate than the well produces,
the drawdown will be excessive and the pump will
cavitate or 'starve' resulting in damage of the pump
and motor.
3. The well must be deep enough so that the pump suc-
tion is at least 10 feet below the expected drawdown
level. If the well screen or water producing aquifer is
above the pumping level, the required submergence of
the pump suction would be over 20 feet.
NEVER INSTALL UNIT WITH THE
BOTTOM OF THE MOTOR CLOSER
THAN FIVE FEET FROM THE BOTTOM OF THE
WELL.
4. The motor must always be immersed in flowing water.
The flow rate must be over .5 ft./sec. If the pump is set
below the well screen openings or other conditions ex-
ist that caused the water to be supplied from above the
pump, a flow induce sleeve should be used.
5. The inside diameter of the well casing must be large
enough to allow lowering the unit into the well with-
out damage to the power cable, the splice between the
power cable and the motor leads. Many wells have
more than one size of casings installed and frequently
the lower sections are smaller in diameter than the
upper casing.
6. The submersible pump/motor unit must be operated
in a straight portion of the well. Exerted pressures can
and will cause misalignment of bearings or coupling.
When the straightness of the well is not known, it is
recommended to lower a test blank with the same
diameter and length as the pump/motor assembly with
electrical leads into the well to the desired depth. If
there is any doubt about straightness, gagging and
plotting are recommended.
4–2 PREPARING THE FOUNDATION
The foundation must be rigid, level and of adequate
strength to support the complete weight of the pump,
motor, column, plus the weight of the liquid passing
through it. It is recommended the foundation be con-
structed of solid concrete, however, adequate beams or
timbers may be used. A common foundation consists of
the following concrete mixture:
1. One part cement
2. Two parts sand
3. Four parts gravel
4. With sufficient water to make a stiff mix
4–3 MOTOR AND CABLE CHECKS AND
PREPARATION
DO NOT USE MOTOR LEADS TO
LIFT OR HANDLE THE MOTOR. THE
MOTOR LEADS ARE EASILY DAMAGED. THEY
SHOULD BE PROTECTED AND HANDLED WITH
CARE AT ALL TIMES.
1. MOTOR SERVICING
Consult the motor manual and perform any preinstal-
lation servicing that is required. Some motors may
require filling with oil or water.
2. ASSEMBLE OF MOTOR TO PUMP
If the pump and motor have not already been assem-
bled, assemble per the instructions given in Appendix
A. For extra long units, it may be more practical to as-
semble the pump to the motor in the vertical position
at the installation site.
3. TESTING BEFORE SPLICING POWER CABLE TO
MOTOR LEADS
Perform the following tests before making the splice
between the motor leads and the drop cable. Instruc-
tions for performing resistance tests and evaluating
the results are given in Appendix C.
MOTOR TESTS
• Measure the resistance between each motor lead
and ground with the motor submerged in water.
See Appendix C.
• Measure the resistance of the motor windings. See
Appendix C. Record the values for future reference.
• Secure the pump and motor with chain tongs to
resist torque. Energize the motor momentarily (on
and immediately off) to check the rotation.
GROUND THE UNIT WHEN TEST-
ING. FAILURE TO GROUND THE
UNIT PROPERLY CAN RESULT IN SERIOUS OR
FATAL SHOCK. ALSO, THE HIGH STARTING
TORQUE OF THE MOTOR WILL CAUSE IT TO
'KICK' WHEN POWER IS APPLIED. THE UNIT
SHOULD BE RESTRAINED SUFFICIENTLY TO PRE-
VENT DAMAGE TO THE EQUIPMENT OR PER-
SONAL INJURY.
NOTE: ROTATION WILL BE COUNTERCLOCK-
WISE WHEN VIEWED FROM THE DIS-
CHARGED BOWL.
On three phase unit, if rotation is wrong, interchange
any two of the motor leads at the control panel.
CORRECT ROTATION IS OF EX-
TREME IMPORTANCE. EXCESSIVE
OVERLOADS MAY BE DEVELOPED UNDER OPER-
ATING CONDITIONS WITH REVERSE ROTATION.
CAUTION
CAUTION
CAUTION
WARNING
CAUTION