 |
|||
|
|
|||
| ||||||||||
|
|  MIL-T-46786B
not less than 1 minute for quality conformance inspection.
Any leakage shall
constitute failure of this test.
4.5.2.3 Hydrostatic. Right after the leakage test, increase the internal
tank pressure to 45 psig. Evidence of structural failure of the tank shall
constitute failure of this test.
4.5.2.4 Slosh. Place the fuel tank on a rocker assembly in a manner that
simulates the actual intended installation. Orient the axis of the rocker
assembly perpendicular to the centerline of the tank length and not more than
4 inches below the bottom of the lowest horizontal surfaces of the tank. Fill
the tank to one-half capacity with water to which a colored dye has been added,
and cap all connections. Adjust the rocker assembly to provide a rocking
action of 15 degrees plus or minus 2 degrees on each side of the vertical.
Rock the tank for not less than 24,000 cycles, at a rate of 1,500 cycles per
hour plus or minus 50 cycles. Evidence of more than 1 ounce by weight per
minute of fluid leakage or structural failure of the tank shall constitute
failure of this test.
4.5.2.5 Venting (vacuum)
Gravity flow day tanks are excluded from this
test. Close all fuel tank openings except for the fuel supply connection and
the venting system. Fill the tank with fuel. Remove all the fuel in the tank
at twice the maximum volumetric pumping rate of the fuel pump to be supplied on
the equipment. Any permanent deformation such as sagging, buckling, cracking
or creating a vacuum in the fuel tank in excess of 3 inches of mercury shall
constitute failure of this test.
4.5.2.6 Venting (p ressure). Type IV and V fuel tanks are exempt from this
test. Fill the tank three-fourths full with fuel having a temperature between
50 "F and 80 "F; seal the fuel outlet, and invert the tank. Apply an
enveloping flame to the tank so that the temperature of the fuel rises at a
rate of not less than 6 `F and not more than 8 F per minute. The venting
system shall activate before the internal pressure in the tank exceeds 30 psig
and the internal pressure shall not thereafter exceed the pressure at which the
system activated by more than 5 psi despite any further increase in temperature
of the fuel. Failure of the venting system to activate at the prescribed tank
internal pressure shall constitute f ailure of this test.
4.6 Inspection of Packaging.
4.6.1
Quality conformance inspection of packaging.
4.6.1.1 Unit of product. For the purpose of inspection, a complete pack
prepared for shipment shall be considered a unit of product.
4.6.1.2 Examination. Each tank, prepared for shipment shall be examined for
the following defects. One or more defects shall constitute as failure.
125.
Plugs, strainers and caps not installed.
126.
Openings into the fuel tanks not sealed.
127.
Type VI fuel tanks not preserved as specified for level A.
128.
Boxes not as specified for level A or B.
129.
Tanks of like description not packed as specified for level A, B or
c.
130.
Strapping not zinc coated for level A.
131.
Marking illegible, incorrect, missing or incomplete.
5.
PACKAGING
16
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals