cardboard. Before you clean up and rein-
force your tank mock-up for sending to the
tank manufacturer to be fabricated, you have
to determine if the capacity meets the re-
quirements for the installation. Your
proposed tank looks like the one shown in
Figure 6-2.
Based on these measurements, you
would determine the tank capacity as
follows:
Step 1. Draw the shape of the sections at
the front, middle, and back of the tank
to a convenient scale. (On symmetrical
tanks, it is usually easiest to draw half-
section areas. On asymmetrical tanks,
draw the full-section areas.)
Step 2. Calculate the area of each of the
three shapes.
Step 3. Use the prismoidal formula to find
the volume and the preceding tables to
find the capacity in gallons or liters.
(Don’t forget to multiply by 2 to get
total volume if you used the half-areas
of the tank.)
Chapter 6:Tank Capacity and Range
TABLE 6-1.CONVERSIONS FOR LIQUID VOLUME AND LIQUID MEASURE
U.S.Measure Liquid Volume
1 cu.ft.= 7 .48 U.S.gal.
1 U.S.gal.= 0 .134 cu.ft.
1 U.S.gal.=231 cu.in.
Metric Measure Liquid Volume
1 m^3 =1,000 L
1 L = 0 .001 m^3
1 L =1,000 cm^3
English Units Metric Units SpecificLiquid lb./cu.ft. lb./gal. kg/m^3 kg/L Gravity
Seawater 64. 00 8. 56 1,025 1. 025 1. 03
Fresh Water 62. 40 8. 34 1,000 1. 000 1. 00
Fuel Oil 59. 00 7. 89 945 0. 945 0. 95
Lubricating Oil 57. 50 7. 69 921 0. 921 0. 92
Diesel Oil (Fuel) 53. 30 7. 13 854 0. 854 0. 85
Gasoline–Aviation 43. 75 5. 85 701 0. 701 0. 70
Gasoline—Marine 45. 30 6. 06 726 0. 726 0. 73
Alcohol 50. 50 6. 75 809 0. 809 0. 81
Kerosene 50. 90 6. 80 815 0. 815 0. 82
NOTE:In the metric system, specific gravity is the same as kg/L.
Figure 6-2. Bow
tank dimensions