Xylem IM116 R04 4 Submersible Pumps - Manual (Page 8)

8
The pump discharge head has a loop
for attaching a safety cable. The use
of a safety cable is recommended
when using poly pipe as the pipe
stretches when under pressure and
filled with water.
2.5 Installing Pump in Well
If using a torque arrestor, install it
per the manufacturer’s installation
instructions. Consult the seller for
information on torque arrestors and
for installation instructions.
Connect the discharge pipe to the
discharge head or adapter. Barb
style connectors should be double
clamped. Install the pump into the
well using a pitless adapter or similar
device at the wellhead. Consult the
fitting manufacturer or pitless
supplier for specific installation
instructions.
Using waterproof electrical tape,
fasten the wires to the drop pipe at
10' intervals. Pump suppliers also sell
clip-on style wire connectors that
attach to the drop pipe.
2.6 Special Piping For
Galvanized Tank
Systems
When using a galvanized tank install
an AV11 Drain & Y fitting in the well
and a check valve with snifter valve
at the tank. This will add air to the
tank and prevent water logging the
tank. Use an AA4 Air Escape on the
tank to allow excess air to escape.
The distance between the AV11
and check valve with snifter valve
determines the amount of air intro-
duced on each cycle. See the table for
recommended settings. See Figure 2
in Sec 1.0.
Gaseous wells should use galvanized
or glass lined steel tanks with AA4
air escapes to vent off excess air and
prevent “spurting” at the faucets.
Methane and other explosive or
dangerous gases require special water
treatment for safe removal. Consult a
water treatment specialist to address
these issues.
Installations with top feeding wells
should use flow sleeves on the pump.
2.7 Check Valves
Our pumps use four different styles of
check valves. We recommend check
valves as they prevent back-spinning
the pump and motor which will
cause premature bearing wear. Check
valves also prevent water hammer and
upthrust damage. Check valves should
be installed every 200' in the vertical
discharge pipe. See notes 1 & 2 on
Figure 1 for other check valve place-
ment recommendations.
If you wish to disable a check valve
for a drain back system, you should
use other means to prevent water
hammer and upthrust damage:
• Built-in stainless steel valves have a
flat which is easily drilled through
using an electric drill and a ¼" or
3 ⁄
8
" drill bit to disable the valve.
• Poppet style check valves which
are threaded in from the top of
the discharge head can be easily
removed using a ½" nut driver or
deep socket. The hex hub is visible
and accessible from the top.
• Internal Flomatic™ design plastic
poppet style valves must be
removed from inside which
requires pump disassembly.
• Built-in plastic poppet style valves
with a stem through the top may
be removed from discharge head
by pulling on the stem with pliers.