s
P e c s
/ d
i M e n s i o n s
A
B
C
M
a i n t e n a n c e
M
u l t i
t
a n k
i
n s t a l l a t i o n
u
n d e r G r o u n d
i
n s t a l l a t i o n
This well tank and the entire system must be checked annually by a qualified professional.
Visually examine the tank and its connection to the system piping looking for any signs of water leakage or corrosion on
the exterior of the tank or the connection.
If this water systems tank shows any visible signs of leaking, corrosion or rusting, the tank must be replaced immediately to avoid
personal injury or property damage. Do not adjust the tank air pressure if there are any signs of corrosion on the tank
Failure to follow these instructions may result in serious injury or death and or property damage.
WarninG
M A T E R I A L S O F C O N S T R U C T I O N
Tank:
Cold rolled steel
Finish:
Appliance quality paint for indoor or
outdoor installation
Water chamber:
100% butyl rubber, lined with polypropylene
Connection:
Stainless Steel, or Steel
Testing:
High pressure, seam weld, helium, final
precharge check
Air valve:
Brass valve with o-ring seal
Warranty:
Five year
..
...
..
The Flexcon BG series
has a specially formu-
lated exterior finish for
direct burial in the
ground below the frost
line.
no other flexcon
steel tanks should
be installed under-
ground!
Adjust tank
pre-charge prior to
burial. Ensure that the
tank will be buried
above the water table
and below the frost
line. The tank should
be embedded in coarse
sand above crushed
stone. To minimize stress on the tank and connection in
the event of shifting of the sand surrounding the tank,
we recommend the use of a swing joint connection (see
diagram). Make sure to completely backfill the hole with
sand and compact to prevent tank settling. Permanently
mark and identify the location of the tank.
..
All of the tanks must have the same pre-charge for the sys-
tem to function properly. Adjust each tank’s pre-charge
a s detailed on page 2. The system pressure switch o r
c o n t r o l s h o u l d b e centrally located
(see diagram) in order for the tanks to
function properly.
D I M E N S I O N S & C A P A C I T I E S
Maximum working pressure 125 psig. Maximum working temperature, internal & external 140
o
F.
Tank pre-charge 38 psig.
Total Tank
A
B
C
Total Weight
Volume
Height
Diameter
Connection
gal
liters
in
cm
in
cm
lbs
kilos
14
20
26
32
33.4
44
62
81
85
119
60
80
100
120
130
170
240
310
325
450
22
29
34.5
27.75
42.75
36.25
48
62
44.5
59.75
55.88
73.66
87.63
70.48
108.58
92.07
121.92
157.48
113.03
150.49
40.64
40.64
40.64
53.34
40.64
53.34
53.34
53.34
66.04
66.04
1” NPT
1” NPT
1” NPT
1 1/4” NPT
1 NPT
1 1/4” NPT
1 1/4” NPT
1 1/4” NPT
1 1/4” NPT
1 1/4” NPT
28.0
36.0
41.0
54.0
49.0
67.0
82.0
99.0
121.0
153.0
12.7
16.3
18.6
24.5
22.2
30.4
37.2
44.9
54.9
69.5
16
16
16
21
16
21
21
21
26
26
ground
level
frost line
crushed
stone
coarse
sand
bg series
underground tank
Pump
to house
.
. .
l
ocation
Select a location where a water leak will not cause prop-
erty damage and provides adequate means for water
drainage. This well tank and the associated piping may in
time leak. The manufacturer is not responsible for any
water damage that may occur in association with the well
tank installation. The tank location should be as close as
possible to the system pressure switch to reduce the
negative effects of friction/elevation pressure loss. This
tank has been designed to be mounted on a level surface
and must be adequately supported around the entire base.
d i s c o n n e c t o r s h u t o f f t h e
electrical power source to the
system pump. shut off the water supply to the
system and remove all water pressure from the
system. failure to follow these instructions may result
in serious injury or death and or property damage.
Install the well tank in the incoming water line from the
pump and before any fixtures (see Fig. 1). Adequate
thread sealant (pipe dope) must be added to ensure a
leak free installation.
a p r o p e r l y s i z e d p r e s s u r e
relief valve set at a maximum
o f 1 0 0 p s i m u s t b e i n s t a l l e d i n t h e s y s t e m .
Before turning on the water supply to the system, open a
water faucet to allow air from the system piping to be
released. Turn on the power to the water supply and the
pump should turn on, filling the system piping. When the
water is flowing freely from the faucet without air, close the
faucet. The pump will continue to run filling the well tank.
Inspect the installation for water leaks paying close
attention to the connection between the well tank and the
system piping.
b
e f o r e
i
n s t a l l a t i o n
i
n s t a l l a t i o n
P
re
-
cHarGe adjustMent
This well tank is shipped from the factory with a pre-charge of 38 psi. The well tank should be pre-charged to 2 PSI below
the cut-in setting of the pressure switch but must not exceed 80 psi. Any adjustments to the factory pre-charge must be done
prior to initial tank installation and with 0 psi pressure on the system.. DO NOT ADJUST THE PRE-CHARGE OF THE
EXPANSION TANK WITH THE SYSTEM UNDER PRESSURE!
t
o adjust tank PrecHarGe
(Prior to Installation)
Remove the protective cap from the air valve.
Check the tank pre-charge pressure using a standard tire pressure gauge.
If required add air to the tank using a manual bicycle tire pump until the proper pre-charge pressure is reached.
Replace the protective cap on the air valve.
t
o adjust tank PrecHarGe
(After Installation)
Disconnect power to the system pump.
Drain the tank of water by opening a faucet
Add or release air as required (see above)
Do not adjust the tank air pressure if there are any visible signs of corrosion on the tank. If this well tank shows any visible signs
of corrosion or rusting, the tank must be replaced immediately. Failure to follow these instructions may result in serious injury
or death and or property damage.
WarninG
WarninG
fig. #1
WarninG
t
yPical
i
nstallation
Pressure
switch
Pressure
gauge
Pressure
relief valve
(required)
(3)
(2)
