 |
|||
|
Page Title:
Temperature and humidity , non-operating condition |
|
||
| ||||||||||
|
|  MIL-P-82442(OS)
Temperature and humidity , non-operating condition. TWO
4.4.4.5
preproduction pumps shall be subjected, in the non-operating condition,
to temperature and humidity cycling in the following manner: The specimen
shall be placed in a temperature chamber which has been stabilized at an
environmental temperature of -45 F + 0 - 5 F. The specimen shall
remain in the environment for 6 hours. (As an alternative procedure,
the specimen may be placed in the chamber, with the chamber at room
ambient temperature. Chamber temperature shall then be reduced to -45 F
+ 0 -5 F within 2 hours maximum. The specimen shall thereafter remain
in the chamber for 4 hours) . The specimen shall then be subjected to an
environmental temperature of +140 F + 5 F -0 F. Maximum transition
time from the low temperature to the high temperature shall be 2 hours.
The specimen shall remain in the high temperature environment for 4
hours. This cycle shall be performed 3 times; maximum transition time
shall be 2 hours. The specimen shall subsequently be subjected to an
environment of +110 F +5 -0 F at a minimum relative humidity of 95
percent for a minimum of 8 hours. Thereafter, one pump shall be operated
in accordance with 4.4.4.6 and one pump shall be operated in accordance
with 4.4.4.7. Prior to operation the pump may be wiped dry. Drying by
an air blast or oven is not permitted.
4.4.4.6
Low temperature operating. Before testing, the pump,
installed in its test chamber in the ready condition, shall be conditioned
at a temperature of 0 F 5 F for a period of 1 hour. M e d i a t e l y
thereafter the pump shall be operated in accordance with and meet the
requirements of 4.4.4.1 at an environmental temperature of +32 F 5 F.
4.4.4.7
High temperature operating. Before testing, the pump,
installed in its test chamber in the ready condition, shall be conditioned
at a temperature of +140 F 5 F for a period of 1 hour. Immediately
thereafter the pump shall be operated in accordance with and meet the
requirements of 4.4.4.1 at an environmental temperature of +140 F 5 F.
4.4.4.8.
Vibration, packed and packaged.
The pump, packed and packaged
in accordance with Section 5, shall be vibrated in such a manner as to
determine the frequency producing maximum transmissibility within the
frequency range of 5 to 60 cps. The container shall be fastened, in
suitable fashion, to the table of a vibration testing device producing
an essentially sine wave motion. The maximum permissible motion freedom
shall be approximately 1/32 inch.
The specimen shall then be vibrated
for 1 hour at the frequency producing maximum transmissibility and at an
input acceleration of 1 g. This test shall be applied to each of the three
principal orthogonal axes.
11
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals