JOTP-011
5 December 2014
APPENDIX A. BACKGROUND/RATIONALE
ANNEX 1. ENVIRONMENTAL TESTS
This test does not simulate a specific transport scenario but it uses the rapid transition between the
extreme temperature values to thermally stress the munition.
b. In this scenario, a single set of temperature shocks will be required. The temperature
shock test consists of ten cycles from a c o l d e x t r e m e temperature of -51 °C to the high
extreme temperature of no less than 71 °C. The transfer rate between chambers should be as
fast as possible and is dependent upon munition portability requirements (i.e., man vs. machine).
A.1-2.5 Immersion /Pressurization (Appendix C, Annex 1, Paragraph C.1-7).
a. Munitions may be exposed to water immersion during fording. The immersion test
determines if the ingress of water affects materials and safe operation of the munition. This test
requires temperature conditioning of the munition to establish a pressure differential (on cooling)
to determine whether the seals or gaskets leak under relatively low pressure differential, and to
induce expansion/contraction of materials. Temperature conditioning the item to 27 °C above the
water temperature represents exposure to solar heating immediately prior to immersion. Thirty
minutes of immersion at a depth of one meter is required.
b. Munitions intended for underwater launch are normally exposed to hydrostatic pressure
related to its launch depth. The test requires the munition to be conditioned as it would prior to
and during the launch. With the munition properly conditioned, the munition shall be subjected to
a hydrostatic pressure of 110% of the baseline specified launch pressure.
A.1-2.6 Salt Fog (Appendix C, Annex 1, Paragraph C.1-8).
a. The salt fog test (MIL-STD-810, Method 509) provides a set of repeatable conditions to
determine the relative resistance of the munition to the effects of an aqueous salt atmosphere. This
test locates potential problem areas, quality control deficiencies, design flaws, etc., in a relatively
short period of time and is required for munitions that will experience significant exposure (as
opposed to infrequent or irregular) to high levels of salt in the atmosphere. It should be noted that
testing at the component level may not address galvanic corrosion.
b. As a minimum, this JOTP requires two cycles of alternating wet-dry-wet-dry conditions
of 24 hours each to be imposed. Experience has shown that alternating periods of salt fog exposure
and drying conditions provides a more realistic exposure and a higher damage potential than does
continuous exposure to a salt atmosphere. The munition is tested in the most vulnerable
configuration (packaged or unpackaged) as identified in the LCEP. The number of cycles may be
increased if a higher degree of confidence is required to assess the ability of the materials involved
to withstand a corrosive environment (e.g., sea based munitions stored above deck may require
additional cycles). Note, there is no relationship between this test and any real world exposure
duration but it does provide an indication of potential problem areas associated with the salt
(maritime) environment, nearby water sources, and from salted roads during winter operations.
A.1-7
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