JOTP-011
5 December 2014
APPENDIX D. OPERATING TEST DESCRIPTIONS
ANNEX 2. COMPONENT LEVEL OPERATING TESTS
b.
Fill the rocket motor completely with an inert test fluid such as water.
c. Using a high-pressure pump or a bursting diaphragm arrangement, rapidly pressurize the
vessel until it bursts. Note that the fluid line should have provisions for an additional volume of
test fluid to be pumped into the vessel to account for motor case expansion. The rate of
pressurization shall approximate the pressurization rate of a normally fired motor.
d.
Perform a post test inspection of the motor case to check for indications of structural
failure.
e. The probability of motor case rupture is estimated using the static firing and burst test
pressure data in the statistical method presented in Appendix G. Further guidance on bursts test
methods may be found in ITOP 05-2-621.
D.2-3 OTHER PRESSURE VESSELS.
Other types of pressure vessels (gas generators, high pressure pneumatic vessels, etc.) in the
munition are hydrostatically burst tested to assess personnel hazards and determine safety design
margins. Compare burst pressures to determine the safety margin and the likelihood of burst.
Determine the fragment size, the velocity, and the fragment distribution to assess the hazard in the
event of burst during service use of the vessel.
D.2-4 WARHEAD ARENA TRIALS.
Warhead arena trials are performed to determine safe separation distances and range safety
parameters. These trials should be conducted with non-sequential, factory fresh warheads unless
it can be shown that exposure to thermal and dynamic stresses in the Sequential Environmental
Test Sequence results in an increase in fragmentation distance. Guidance for this test can be found
in ITOP 04-2-813.
a.
Perform this test on four individual warheads at ambient temperature.
b. Warhead arena trials require the use of the warhead only. However, the tester should
evaluate whether components directly attached to the warhead or in the immediate area of the
warhead, either by design or by inadvertent action, could significantly affect the warhead's
fragment dispersion pattern.
c.
Place the item in the instrumented arena and detonate the warhead.
d. Determine warhead fragment size, velocity, mass, spatial distribution, and levels of noise
and blast pressure.
D.2-2
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