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Page Title:
Calculation of liberated gas volume. |
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|  is facilitated by placing the cup of the tube in a horizontal position so that mercury does
not block the capillary opening.) After evacuation, disconnect the pump. S al the connection
e
between the capillary tube and the heating tube with I ml of mercury. Measure the total
vertical height of the column of mercury in the capillary tube. Measure and subtract the
vertical height of the mercury in the cup. The difference shall be represe ted by the symbol
n
H1 Note the room temperature (t1) and the barometric pressure. Subtract the value H1 from
the barometric pressure in millimeters Represent this difference by the symbol P Insert the
heating tube in the vacuum stability test chamber. Maintain at the proper test temperature
for 48 hours. Remove the heating tube and capillary tube assembly from the bath and allow
to cool to room temperature. Measure the total vertical height of the column of mercury in
the capillary tube and subtract the vertical height of the mercury in the cup. This
difference shall be represented by the symbol H. Note the room temperature (t) and the
barometric pressure in millimeters. Subtract the value H from the final barometric pressure
in millimeters; represent this difference by the symbol P.
4.6.14.1.3
Calculation of liberated gas volume.
Calculate the volume of gas in
milliliters liberated in the test, at standard conditions, using the following formula:
V = [A + C(B - H)] 273P
- [A + C(B1 - H1)] 273P1
760(273 + t)
760(273 + t1)
where
A=
volume of heating tube minus volume of explosive in test, ml
B=
total length of capillary tube minus height of mercury column in the cup measured at
end of test, mm
B1 = total length of capillary tube minus height of mercury column in the cup measured
before the test, mm
C=
unit capacity of capillary tubing, ml per mm
H=
total vertical height of column of mercury in capillary tube minus the vertical height
of the mercury in the cup after test, mm
H1 = total vertical height of column of mercury in capillary tube minus the vertical height
of the mercury in the cup before test, mm
P
=
the value H subtracted from the final barometric pressure, mm
P1 = the value H1 subtracted from the initial barometric pressure, mm
t=
temperature of the room after test, C
t1 = temperature of the room before test, C
4.6.14.1.4 Calculation of reactivity. Calculate the reactivity gas of each of the
explosive materials with each inert compound as follows; convert all individual volumes (X,
Y, and Z) to a 1-gram basis:
Reactivity gas, ml = X - (Y + Z)
2
where:
x=
gas produced by the mixture of explosive material and inert compound, ml
Y=
gas produced by the explosive material alone, ml
Z=
gas produced by the inert compound alone, ml
4.6.14.2 Differential thermal analysis. When this test is required (see 4.4), the
explosive laboratory of the cognizant agency shall determine the procedure to be used and
interpret the results.
5. PREPARATION FOR DELIVERY
5.1 Packing. Unless otherwise specified, the polymeric components shall be packed Level
B utilizing steel shipping pails, PPP-P-704, or 55-gallon metal drums, PPP D-729. The inside
-
surfaces shall be treated, as required, to preclude content contamination. Each container
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