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First article test report
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Cylinder, High Pressure Air, Fiberglass Reinforced Plastic (FRP), Metal Lined
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Examination



img
MIL-C-24604(SH)
inform the Government representative the cause of failure and the action
taken to preclude recurrence.
After  correction, all of the tests shall
be repeated.
4.4.4.1
Individual tests may continue. Individual tests and
production may be continued pending the investigation of a sample test
failure,  however, final acceptance of items on hand or produced later,
shall not be made until it is determined that all items meet all the
requirements.
4.4.4.2
Defects in items already accepted.  The investigation of
a test failure could indicate that defects may exist in items already
delivered or in service.
If the type of defect found denotes an
operational  safety  hazard, the contracting activity shall be notified at
At the conclusion of the investigation, the producer shall fully
once.
advise the contracting activity of all the defects found and the method
of correcting them.
4.5
Test
conditions.
4.5.1
Pressure  media.  Pressure tests shall be performed
pneumatically with air or a helium-air mixture, except that volumetric
expansion,  endurance, hydrostatic burst, soak cycle, and humidity cycle
tests may be performed with fresh water.
The permissible tolerance snail
be plus or minus  10
from the stated value.
4.5.2
Temperature.  Unless otherwise specified herein, tests shall
The
be conducted at room temperature, that is between 70F and 80F.
temperature of the gas supply shall also be maintained within these limits
for room temperature tests.
The actual ambient temperatures shall be
recorded .
Permissible tolerances shall be +10F for minus 20F, +5F for
and
for 120F.
4.5.3  Rate of pressure rise. The rate of pressure rise for the
volumetric expansion test and the hydrostatic burst test shall be not
greater than 25,000
per minute.
4.5.4
Standard air.  Standard air shall be considered to be dry
air at a temperature of 69F, pressure of 14.7
and weighing 0.075
pounds per cubic foot (density).
4.6
Examination and tests.
4.6.1
Volumetric  expansion  test. The volumetric expansion test
shall be conducted by subjecting the cylinder to 1.5 times operating
pressure and maintaining that pressure for not less than 60 seconds to
insure complete expansion of the liner.
The test shall be performed
individually and the volumetric expansion of the cylinder shall be
determined to 0.5 milliliters (mL) or to an accuracy of 1 percent of total
expansion and recorded in mL.
No pressure in excess of operating pressure
shall be applied prior to this test unless It is a pre-stressing operation
as part of the manufacturing process.
The total l xpansion shall be
recorded and the cylinder shall be repressurized and the residual expansion
shall be recorded.
Cylinder test results shall meet 3.3.1.
The rate of
pressure rise shall be in accordance with 4.5.3.
10

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