Xylem IMVS R01 Model VS Vertical Industrial Turbine Pumps - Manual (Page 7)

7
DROP CABLE TEST
• Measure the resistance between the cable conduc-
tors and ground with the cable submerged in water.
See Appendix C.
4. SPLICING POWER CABLE TO MOTOR LEADS
A waterproof splice must be made to connect the
power cable to the motor leads. A properly made
splice will last the life of the pump. An improperly
made splice will become a service problem. Make the
splice per instructions supplied with the drop cable
or per instructions in the pump motor manual. The
splice should be located above the pump bowl. It
should be as compact as possible. A compact splice is
less likely to be damaged as the pump is being lowered
into the well. See Appendix B for instruction on splic-
ing the cable.
5. TESTING AFTER SPLICING POWER CABLE TO
MOTOR LEAD
Perform the following test after making the splice, but
before lowering the pump into the well.
• Check that the splice is waterproof by immersing it
in a container of water for approximately one hour
and then taking resistance readings between each
cable conductor and the water. See Appendix C.
• Measure the total resistance of the complete drop
cable and motor circuit to insure that a good splice
was made. Record the values for future reference.
THE MINIMUM READING FOR EACH
LEAD TO GROUND SHOULD BE 50
MEGOHMS.
SECTION 5 — INSTALLING THE PUMP
1. Check the pump and motor shaft to make sure it turns
free before installation. For some models, it may be
necessary to remove the suction screen in order to
check the shaft. Be sure to reinstall the suction screen.
2. Raise the bowl/motor assembly with the shipping skids
still in place. Remove the shipping skids and lower as-
sembly into the well, clamping the bowl assembly near
the top.
3. Attach the elevators to the bottom column pipe imme-
diately below the column coupling. Hoist the column
section into place above the well and the top of the
bowl assembly, providing a soft board or pipe dolly
for the end of the column pipe to slide in on so that
threads will not be damaged while the section is being
raised. Clean all threads with thread lubricant. Thread
the pipe into the discharge bowl connection and make
up tight, using one set of chain tongs for backup.
THE PUMP MOTOR WILL EXERT
A TORQUE THAT WILL TEND TO
UNSCREW THREADED COLUMN PIPE CONNEC-
TIONS. FOR THE REASON, THREADED COLUMN
JOINTS MUST BE TIGHTENED.
THE FOLLOWING TABLE GIVES THE NORMAL
AMOUNT OF THREAD ENGAGEMENT NECES-
SARY TO MAKE A TIGHT JOINT FOR THE NPT
THREAD JOINT:
Pipe Length of Number
Size Thread (in.) of Threads
3" 1" 8
4" 1 1 /
8
" 9
5" 1 1 /
4
" 10
6" 1 5 /
16
" 10 1 /
2
8" 1 7 /
16
" 11 1 /
2
10" 1 5 /
8
" 13
4. Install a cable clamp on each side of the cable splice.
See Figure 1. Be careful not to damage the cable. If
an air line is to be installed, route it beside the cable,
making sure that it is not pinched by the clamps. If
there is any danger that the splice will rub against the
well casing during installation, it should be protected
by thick rubber chaffing pads or by a steel shield.
Check that the grounding system is in place.
FAILURE TO GROUND THE UNIT
PROPERLY CAN RESULT IN SERIOUS
OR FATAL SHOCK. REFER TO ELECTRICAL CODE
REQUIREMENTS.
5. Slowly lower the unit into the well (or sump) adding
joints of column pipe as the unit is lowered. Tighten
each joint securely. See note above. Remove slack from
the power cable and attach a cable clamp approxi-
mately every 20 feet. For units with large heavy power
cable, additional cable clamp may be required to give
additional support. Line up the cable on one side of
the pump and maintain as much clearance as possible
on that side when lowering the pump in the well. BE
EXTREMELY CAREFUL NOT TO SCRAPE OR
DAMAGE THE POWER CABLE, CABLE SPLICE
OR GROUNDING SYSTEM WHEN LOWERING
THE PUMP. Hold the power cable up away from the
well casing as lowering the pump into the casing.
6. If the pump does not have a built-in check valve, a line
check valve should be installed within 25 feet above
the pump bowl assembly. For a deep setting pump, a
line check valve is recommended for every 200 feet
of column pipe, However, no check valve should be
installed above the pumping level.
7. As soon as the splice joint is submerged in the water,
take a resistance reading between the power cable
conductors and ground to assure that the insulation
and the cable or the splice was not damaged during
installation.
8. After the last piece of column pipe has been installed,
install the well head. Install a cable clamp between the
last column pipe coupling and the well head base. See
Figure 1. Route the power cable and grounding system
through the large threaded hole in the head base.
Route the air line (if used) through one of the smaller
threaded holes in the head base. The remaining small
threaded hole is for connection of a well vent or other
accessories. All of these holes are threaded with stan-
dard NPT or BSP pipe threads. If a gasket is required
between the head base and its mounting surface, the
gasket should be placed on the foundation prior to
installing the well head.
CAUTION
CAUTION
WARNING