AFMAN 24-204(I)/TM 38-250/NAVSUP PUB 505/MCO P4030.19H/ DLAI 4145.3
367
11 DECEMBER 2001
A26.3. Temperature Conversion. Use figure A26.3 to convert temperatures between Celsius and Fahrenheit.
Figure A26.3. Temperature Conversion Formulae.
C = (F-32) times 5/9
F = (C times 9/5) + 32
K = C + 273
C = degrees Celsius
F = degrees Fahrenheit,
K = degrees Kelvin (absolute)
A26.4. Net Quantity of Gas Conversion Formulae. Use figure A26.4 to determine the net hazard of a
compressed gas by converting PSI of a cylinder into pounds. Use figure A26.5 to determine the molecular weight or
specific gravity required to complete the formula.
Figure A26.4. Net Quantity of Gas Conversion Formulae.
Formula (1)
P= 0.00512 x A x B x C
or
Formula (2)
P= .0001744 x A x B x M
where:
P= weight of gas in pounds
A= pressure in pounds per square inch
B= volume of cylinder in cubic feet
C= specific gravity of the gas
M= molecular weight of the gas molecule
NOTE: Use Formula (1) for calculation using the specific gravity value. Use Formula (2) for calculation using the
molecular weight value.
A26.4.1. Example for Determining Net Quantity of Gas. The following information is known or determined by
examination of the cylinder. Measure the cylinder’s height from the external base to the valve seat. Measure the
external diameter (width). Assume the cylinder does not cone at the top.
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Example 1.
Tank measurements:
Height: 50 inches
Diameter = 2 x (radius)
Diameter: 9 inches
R (inches) = 9/2 = 4.5
Tank contents: CO2
Internal Pressure: 900 psi
Tank Volume
V = p r2h
V = p (4.5 inches)2 x (50 inches)
= {3181 inches}3 x {1/1728 (Ft3/inches3)}
V = 1.841 Ft3
P (pounds of gas) = 0.00512 x A x B x C
= {0.00512 in2/Ft3} x {900 psi} x {1.841 Ft3} x {1.516}
P = 12.9 pounds
