 |
|||
|
Page Title:
Appendix A Electronic Pressure, Velocity and Action Time (EPVAT) Test Procedures |
|
||
| ||||||||||
|
|  MIL-C-14858A (AR)
AMENDMENT 3
APPENDIX A
ELECTRONIC PRESSURE, VELOCITY AND ACTION TIME (EPVAT) TEST
PROCEDURES
A.1 SCOPE:
A.1.1 Scope. This appendix details the procedures to conduct the chamber pressure,
velocity and action time tests. These tests are performed simultaneously. This appendix and
supporting annexes are a mandatory part of the specification.
a. The chamber pressure test determines the pressure exerted in the chamber (cartridge
case mouth location) of a weapon. The test is performed as a safety measure to insure that the
pressure developed by the ammunition is safe for firing in the weapons for which it is intended.
b. The velocity test determines the velocity level and uniformity of the ammunition.
c. The action time test determines the overall primer ignition, propellant burning time,
and barrel time (to antenna bar).
A.2 APPLICABLE DOCUMENTS (This section is not applicable)
A.3 EQUIPMENT
A.3.1 Equipment listed in the application Inspection Equipment List shall be used.
Alternate designs may be submitted to TACOM-ARDEC for approval prior to use.
A.3.2 The pier or mount, on which the test fixture assembly is mounted, shall be of rigid
construction.
A.4 USE OF REFERENCE CARTRIDGES
A.4.1 Reference cartridges shall be used to qualify test setups and establish range and
equipment connections prior to firing an ammunition lot for acceptance.
A.4.2 One reference cartridge shall be fired for each cartridge of the test sample to be
fired, up to 20 cartridges. When the test consists of more than 20, but not more than 40
cartridges, then 20 reference cartridges shall be fired. When the test consists of more than 40
cartridges, then one reference cartridge shall be fired for every two test cartridges.
A.4.3 After the required number of reference cartridges has been fired, the actual mean
chamber pressure and velocity of the reference cartridge shall be compared with their respective
assessed values as follows:
a. If the assessed value is greater than the actual mean value, the difference shall be
added to the respective mean values obtained for the test cartridges.
b. If the assessed value is less than the actual mean value, the difference shall be
subtracted from respective mean values obtained for the test cartridges.
5 (21)
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals