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WATER TANK STERILIZATION
Water storage tanks and delivery pipes must be
sterilized prior to use in holding disinfected water for household
use. This requires the addition of considerably more chlorine compound
than mere disinfection (50 parts per million of available chlorine).
The tank and all delivery pipes are then flushed after a period
of hours at the least, followed by refilling with water to be used
for household use. There is often sufficient chlorine compound left
in small tanks to disinfect the clean water used to refill the tank,
but larger tanks should have the refilled water disinfected at half
the normal 1% rate.
If water must be hauled or pumped via hose or pipe
to the tank, and pipes or hoses used to deliver the water to the
home, all the auxiliary pipe line from the source to the point of
distribution should be sterilized prior to use. If galvanized pipe
is used, do not leave it filled with a strong chlorine compound
for more than several hours, or the galvanizing (tin) may be adversely
affected by the chlorine, as tin is an active metal. First, thoroughly
flush the pipe line, and determine the capacity (volume) of the
pipe line.
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Amount
of Chlorine Compound Required For Tank Disinfection
|
|
Gallons
|
5.25%
Bleach
|
25%
Chloride of lime
|
|
100
|
2
cups
|
3
ounces
|
|
250
|
5
cups
|
7.5
ounces
|
|
500
|
2.5
quarts
|
1
pound
|
|
1,000
|
5
quarts
|
2
pounds
|
|
2,500
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2.5
gallons
|
4.5
pounds
|
|
5,000
|
4
gallons
|
9
pounds
|
| Diameter |
Gallons/100
ft. |
|
2"
|
16
|
|
4"
|
65
|
|
6"
|
150
|
|
8"
|
260
|
|
10"
|
410
|
|
12"
|
590
|
|
16"
|
1050
|
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20"
|
1650
|
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24"
|
2350
|
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30"
|
3672
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| Capacity
of Circular Wells: |
| Diameter |
Gallons/foot |
| 4" |
0.65 |
| 6" |
1.5 |
| 8" |
2.6 |
| 12" |
6 |
| 2 ft. |
24 |
| 3 ft. |
53 |
| 4 ft. |
94 |
| 5 ft. |
147 |
| 6 ft. |
212 |
Multiply the gallons per foot figure by the depth of
water in the well to get the total gallonage.
Capacity
of Rectangular Wells or Tanks
The capacity of a rectangular well or spring box
is found by multiplying the length by the width by the height, all
in feet, then multiplying by 7.5. This will give the total gallonage.
After determining the total gallonage in the well or spring, add
the proper amount of chlorine compound, mix thoroughly, and allow
it to stand for at least 4 hours and preferably longer. In all cases
pump the chlorinated water through the entire system (pipes, tanks,
etc), running the water through the various faucets until the odor
of chlorine is discernible.
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