MIL-PRF-53068B
TABLE III. Characteristics of seams.
Test paragraph, test
methods of ASTM test
Item
Property
Requirement
methods
1
Breaking strength (initial) 1/
500 psi (min)
D751 2/
2
Breaking strength after
immersion in distilled water
at 160±2 °F for the
following durations:
14 days
280 psi
D471/D751/4.5.3.17
42 days
280 psi
D471/D751/4.5.3.17
3
Dead load shear resistance
0.1 inch slippage (max)
4.5.3.18
under 50 psi stress at
180±5 °F for 8 hours
4
Peel adhesion (initial)
15 psi (min)
D413 machine methods
5
Peel adhesion after
immersion in distilled water
at 160±2 °F for the
following durations:
14 days
12 psi
D413 machine methods/
D471/4.5.3.17
42 days
10 psi
D413 machine methods/
D471/4.5.3.17
1/ All specimens must break in the coated fabric. Failure of any specimen in a seam area at any
value shall constitute failure of this test.
2/ Specimens shall be 2 inches in width.
3.3.2 Chafing patches. The interior and exterior of the tank, opposite the location of each
fitting shall be provided with bonded coated fabric chafing patches. The chafing patches shall be
the same coated fabric used to fabricate the tank.
3.3.3 Bonded fittings.
3.3.3.1 Fitting type. Unless otherwise specified (see 6.2), each tank shall be furnished
with a 2-inch male quick disconnect inlet/outlet mounted on the tank top. The fittings shall be
compression type and shall be bonded to the tank fabric. The fittings must meet the requirements
of table IV. The design of all cam-locking type, quick disconnect couplings shall conform to
A-A-59326. The maximum torque for all fitting bolts shall be stamped onto the fitting flange
plates or stenciled on the tank fabric adjacent to the respective fittings, in .18-inch lettering. The
tank shall be supplied with a 2-inch anodized aluminum ball valve conforming to MSS-SP72 or
MSS-SP110. The valve shall be female to male, quick disconnecting and shall have a one
quarter turn handle with a locking mechanism. Also included shall be a 2-inch cam-lock dust
cap with keeper chain. The tank shall be equipped with a valve for bleeding air from the tank.
8
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