SURFACE AREA OF VARIOUS SIZE
ELEVATED WATER TANKS*
| CAPACITY (Thousand Gallons) |
RISER (Diameter) |
INSIDE AREA (Square Feet) |
OUTSIDE AREA (Square Feet) |
| 50 | 4’ | 3,150 | 6,500 |
| 100 | 4’ | 4,300 | 8,000 |
| 150 | 4’ | 5,100 | 9,900 |
| 200 | 4’ | 5,900 | 11,100 |
| 250 | 4’ | 6,700 | 12,700 |
| 500 | 5’ | 10,000 | 19,600 |
| 750 | Dry 8’ | 13,600 | 29,100 |
| 1000 | Dry 8’ | 17,000 | 36,900 |
* Low Water Level 100’ above grade.
+ Includes supporting columns.
The above chart is applicable to the tanks shown below
In estimating the square foot area of a tank different than those shown on the preceding page, do the following -----
EXAMPLE:
Suppose the tank is 30 feet across and 50 feet high. The square of the diameter then is 900 feet (30x30). Which when multiplied by .7854 shows 706.9 square feet at the top of the tank. The diameter of 30 feet multiplied by 3.1416 shows that the tank is 94.3 feet around. The circumference of 94.3 multiplied by the height of 50 feet equals 4.715 square feet – area of the wall. Total area of approximately 5.425 square feet.
Any accessories such as piping, valves, rails, structural work, etc., would have to be estimated separately.
HOW TO FIND SURFACE AREAS OF:
|
CORRUGATED METALS 2 ½" Corrugated Sheet – to find width before corrugation multiply the width after corrugation by 1.08. Assume depth to be 3/8". 1 ¼" Corrugated Sheet – to find width before corrugation multiply the width after corrugation by 1.11. Assume depth to be 3/8".
ROOF DECK If the roof deck has a cross section view similar to that shown, first figure the square foot area then multiply by 2.42 to obtain the actual surface area. If the roof deck has a cross section view similar to that shown, figure the top side as just the square foot area of surface. Figure the underside as follows:
multiply by 1.63 for actual surface area. SIDING If the siding has a cross section view similar to that shown multiply each square foot of area by 1.5 for actual surface area. Double for both
sides. If the siding has a cross section view similar to that shown multiply each square foot of area by 1.42 for actual surface area. Double for both sides. If the siding has a cross section view similar to that shown multiply each square foot of area by 1.75 for actual surface area. Double for both sides. If the depth is 3" multiply by 1.5. Double for both sides. |
 |
SURFACE OF SPHERES
|
Diameter in Feet |
*Surface of Sphere in Square Feet |
|
20 |
1,257 |
|
25 |
1,963 |
|
30 |
2,827 |
|
35 |
3,848 |
|
40 |
5,027 |
|
45 |
6,362 |
|
50 |
7,854 |
|
55 |
9,503 |
|
60 |
11,310 |
|
65 |
13,273 |
|
70 |
15,394 |
* Outside surface area only –
double surface area for inside and outside
pp.18-9 & 18-10.
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