MIL-D-21523A(Wep)
AMENDMENT 2
28 April 1964
MILITARY
SPECIFICATION
FOR
DIAPHRAGM ASSEMBLY
This amendment forms a part of Military Speci-
fication MIL-D-21523A (Wep), 23, June 1961, and
has been concurred in by the Bureau of Naval
Weapons.
Page 5, paragraph 3.3.3: Delete and Substitute:
Rapidly Applied Pressure - With 6 inches of
"3.3.3
salt water (3 percent salt by weight) maintained at a tem-
perature of + 28 + 2 degrees FahrenheLt on the upper surface
of the diaphragm assembly, the diaphragm shallwithstand
a differential air pressure of 15 + 1/2 psi applied against
the upper surface within 15 to 18 seconds. After the 15
psi limit is reached, the air pressure shall be immediately
reduced to 0 psi differential and a differential air pres-
sure of 10 + 1/2 psi shall be applied against the lower sur-
face within 15 to 28 seconds. After the 10 psi limit is
reached, the air pressure shall be immediately reduced to
0 psi differential. The deformation as measured within
1/2 hour after removal of the salt water shall not exceed
1-3/4 inches from the nominally flat surface and thereafter
the diaphragm shall be capable of meeting all performance
requirements of this specification."
Page 6, add paragraph 3.3.4.1:
Bilateral Flexure at 28 Degrees - With 6 inches
"3.3.4.1
of salt water (3 percent salt by weight) maintained at
a temperature of +28 + 2 degrees Fahrenheit above the mem-
brane, the diaphragm assembly shall withstand the bilateral
flexure specified in 3.3.4, shall show no water leakage, no
permanent deformation of the membrane in excess of 3 inches
from the nominally flat surface, and thereafter shall be
capable of meeting all performance requirements of this
l specification ."
FSC
1440
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