MIL-PRF-53015B
0.0312±0.0156 inches thick, in a crisscross pattern, leaving approximately 15of the cellular
material exposed.
3.3.3.1 Size and weight. The displacement ball shall conform to the following size and
weight requirements:
Type II
Type I
Bare foam size (in.)
6.29 nominal
4.46 nominal
Finished size (in.)
6.43±0.11
4.60±0.11
Weight (lb.)
0.37
0.14
3.3.4 Ball inlet assembly. The type I ball inlet assembly shall consist of a quick
disconnect, grooved-end pipe connecting clamp, grooved-end pipe cap, and pneumatic hose
coupling. The type II ball inlet assembly shall consist of a 4-inch pipe coupling in accordance
with A-A-52592, and a universal, twist-lock, claw hose coupling.
3.3.4.1 Quick make and break, grooved-end pipe, connecting clamp. The type I pipe
connecting clamp component shall require no tools for closure and shall allow the quick make or
break of a joint. The clamp shall ensure the proper closure, sealing, and secure attachment of a
6-inch pipe with a grooved-end in accordance with A-A-52592. The clamp shall secure the
grooved-end pipe cap to the pipe, to withstand a minimum pressure of 300 psi.
3.3.4.2 Grooved-end pipe cap / pneumatic hose coupling. For type I kits, a 6-inch pipe
cap, in accordance with A-A-52592, shall be modified to accept a 1-inch, universal, twist-lock,
claw hose coupling. The hose coupling shall be installed so that the claw portion faces outward
when the ball inlet assembly is connected to the hoseline.
3.3.4.3 Pipe coupling. The type II pipe coupling shall consist of a section of 4-inch pipe
approximately 6.00 inches in length, with one end grooved in accordance with A-A-52592. The
other end of the coupling shall be sealed, or capped, to withstand a pressure of 300 psi. The seal
or cap shall be modified to accept a 0.75-inch, universal, twist-lock, claw hose coupling. The
hose coupling shall be installed so the claw portion faces outward when the ball inlet assembly is
connected to the hoseline.
3.3.5 Ball receiver assembly. The ball receiver assembly shall consist of two pipe fitting
reducers, in accordance with A-A-52592; 8-inch to 6-inch for type I, and 6-inch to 4-inch for
type II. One reducer of each pair shall be modified to stop the displacement ball when it reaches
the receiver, without restricting fluid or air flow. The modification shall be sufficient to
withstand repeated strikes by the ball, without deformation or fracture over the life of the ball
receiver assembly. The larger diameters of the reducer pair shall be permanently joined together.
3.3.6 Pipe connecting clamp. Eight boltless, pipe connecting clamps, with gaskets, shall
be provided for joining grooved-end pipe in accordance with A-A-52592. The clamps shall
provide a secure, tamper-resistant, low profile joint. The pipe connecting clamp shall be 6-inch
for type I and 4-inch for type II.
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