Conversion Formulas

TM 5-5430-209-12

the radius of the tank, as follows:

shell at the vertical joints, one or more nuts may be

loosened allowing the tape to lie flat. However, if this is

R (radius of tank) = 1/2 x C

not practical, dividers should be used to span such

3.1416

obstructions. Each course or ring in a cylindrical tank

Where C = Inside circumference of tank.

should be consider by the "Strapper" to be true cylinder.

10-11. Deadwood Computations

Using the ring measurements, compute the average

circumference of the tank. Average circumference

a. General. Separate computations are made for

should be recorded in feet, tenths, and hundredths.

internal deadwood and external deadwood.

Both

10-10. Conversion Formulas

computations are accomplished using the same basic

formula.

a. General. In order to compute tank volume, it is

b. Deadwood Formula. Deadwood is computed

necessary to convert outside (measured) circumference

as follows:

to inside circumference. The inside circumference will

D (Deadwood in U.S.

Gallons) = L

then be used to find the radius of the inner tank.

(Deadwood length in feet) X

b. Inside Circumference.

In converting the

B (Deadwood breadth in feet) x T

outside

(measured)

circumference

inside

(Deadwood thickness in feet) x 7.48 (gallons in one

circumference, deduction for metal thickness should be

cubic foot.

exact, with results shown in feet to three decimal places.

10-12. Volume Computations

The deduction of metal thickness is computed by the

following formula:

a. Unadjusted Volume is computed as follows: V

Deduction = 2 x 3 1416 x T

(Volume in U.S. Gallons) = 3.1416 x R 2 (radius in feet,

Where T = thickness of metal, expressed

squared) X

in decimals of a foot.

H (Height of liquid fuel in feet) x 7.48

T (Plate thickness = '4 Inch (0 0208 foot)

(Gallons in one cubic foot )

Deduction = 2 x 3.1416 x 0.0208

b. Actual volume is computed by subtracting

= 0.13069

internal deadwood and adding external deadwood to the

= 0 131 foot (results to three decimals)

unadjusted volume shown above.

10-13. Strapping Tools and Components

c. Radius. The inside circumference is used to

find

Refer to table 10-2 for the list of recommended

strapping tools and components.

Table 10-2. Recommended Strapping Tools and Components

FSN

Descrlptlon

Qty

5210-221-1886

Tape, Measuring, Tank Gaging Type, 50 ft long, Graduated in standard Units of inches

and feet, 1/8 in Increments, left to Right Hand Reading, '/2 in wide, steel Nubian Finish,

with Reel Handcrank Rewind with 20 oz Plumb Bob and one (1) Tape Wiper

(Used to measure product and tank heights)

5210-238-1734

Plumb Bob, Brass, Solid Body, 20 oz weight, Non-hardened, Non-removable Point 1/8 m

Graduations

(Extra Plumb Bob for FSN 5210-221-1886 above).

5210-078-8948

Square, Combination, Grooved Type Blade, 12 in long, 1/100, 1/64, 1/50 and 1/32 in.

smallest unit of graduation for each Graduated Edge, Cast Iron Square and Miter Head

with Scriber and One Level (Used for making '4 the distance from the top of each ring on

each side of the vertical seam on fange type tanks)

5210-287-3335

Tape, Measuring General Purpose Distance Measuring Type, 72 in long, Graduated in

Standard Units of 1/32, 1/6 and 1 inch, 1/32 inch Increments on First 6 in of Upper side,

1/6 inch Increments of Balance of Ribbon, Left Hand to Right Hand Reading, l/z in wide

with steel protective finish, with case, butt end type Pull-Push Rewind.

(Used for measuring pipeline connections and "deadwood)

5210-221-1899

Gage, Depth Rule 6 in Rule and Rod Length, Rule Graduated in 32nds and 64ths inch,

Non-Graduated Rod 30, 45 and 60 degree head graduations both sides.

(Used to measure tank shell thickness)

4240-269-7911

Goggles, Industrial, Clear Glass Lens

(Used as eye protection when scraping scale or rust)

5210-720-7982

Level and Plumb, Alurmnum, 48 in long, double face, adjustable to True Vials only, 2 non-

graduated unground level vials in pairs, 4 non-graduated unground level vials in pairs

(Used to determine pitch of bottoms, "deadwood." and as an aid in circumferential

measurement )

10-7