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|  MIL-C-24604(SH)
( A p p l i c a t i o n for copies should be addressed to the National
Aero-
nautics and Space Administration, Washington, DC 20546.)
and technical
association
specifications
and
(Technical
society
They
are
standards are generally available for reference from libraries.
also distributed among technical groups and using Federal agencies. )
REQUIREMENTS
3.
First article inspection. Prior to beginning production, sample
3.1
c y l i n d e r s snail be examined and tested as specified in 4.3 (see 6.3).
Ability of the cylinders to meet the performance and environmental require-
ments of this specification shall be demonstrated by the first article
M a t e r i a l s , design, or construction shall not be altered
inspection.
following first article acceptance.
3.2
Design
and
construction.
3.2.1
Design. The cylinders shall consist of fiberglass filaments
impregnated with a thermosetting plastic resin and wound on a metal liner.
The metal liner shall not be stressed above its elastic limit at cylinder
pneumatic pressure up to proof pressure: the liner shall not be stressed
above 95 percent of its compressive yield strength, cylinder unpressurized;
and the maximum strength in the glass filaments at the 6300 pounds per
operating pressure shall not exceed 30 percent
,
square inch
of the filament stress at virgin hydrostatic burst pressure of the
Stresses shall be computed by the Computer Code NASA CR-72124.
cylinder.
or other equivalent analytic techniques.
Operating
characteristics
of
3.2.1.1
O p e r a t i n g characteristics
.
the
cylinder
shall be as follows:
- Normal room temperature (75F
5F) -
Operating
pressure
(a)
5000
- High temperature (160F) - 6300
Low temperature (minus 20F) - 3700
Proof pressure - 7500
(minimum)
(b)
(minimum)
Burst pressure - 15,000
(c)
Temperature range - Minus 20F to 160F
(d)
Useful cyclic life (without liner leakage) - 500
fill
cycles
(e)
or 100 fill cycles plus 3500 temperature cycles
from
minus
20F to
Dynamic fatigue life - 10 years
(f)
Leakage less than 5 percent pressure in 10 years
(g)
Physical
characteristics
shall
Physical
characteristics.
3.2.1.2
be
as follows:
Port fitting - 302, 304 or 316 series CRES 1-1/8 inch
(a)
12-UNF-3A external thread (port fitting detail shall be
in accordance with detail "X" of MS26545 for internal and
external dimensions).
3
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