RR-C-901E
6.4 Nonshatterability. Historically, government agencies have gunfire tested high-pressure cylinders to evaluate their nonshatterability and fragmentation properties. In applications where military personnel are in confined quarters, it is of prime interest to limit fragmentation and control release of the gas in a cylinder when it is pierced or burst. For ground cylinders over 4 inches in diameter, fragmentation in gunfire test should not exceed two pieces. Extensive testing has verified that cylinders over 4 inches in diameter made of 4130X steel to the limits of the
DOT 3AA specification meet this requirement and have been marked "NONSHAT" by the fabricator. For cylinders in aircraft service, where the controlled release of the contained gas is more critical, tearing about the projectile apertures is limited to 3 inches from hole center. Government and industry have verified that this quality of nonshatterability is most directly related to the average wall stress in cylinder design. The DOT 3AA specification allows an average wall stress of 70,000 psig maximum. Independent investigators have arrived at wall stress limits from 50,000 to 60,000 psig as valid maximums for satisfactory nonshatterability characteristics. For procurement in accordance with this specification, cylinders under 4 inches in diameter that are fabricated in accordance with the DOT 3AA specification and have a 60,000 psig maximum wall stress will be accepted and permanently marked "NONSHAT". Cylinders under 4 inches in diameter with maximum wall stress greater than 60,000 psig will pass actual gunfire tests before being qualified as nonshatterable and permanently marked "NONSHAT".
6.5 Recycled material. The use of recycled material is encouraged when practical, as long as it meets the requirements of the specification (see 3.1).
6.6 Part or identification number. The following PIN procedure is for government purposes and does not constitute a requirement for the contractor.
RRC901 - 1 N1 AF 030 Example of reference part number:
Valve specification code (see table IV) Size code (see tables II and III)
Class code - intended gas service (see table I)
Type 1 = I - DOT 3AA steel
2 = II - Non-shatterable steel
3 = III - Aluminum
Specification number
6.7 Subject term (key word) listing.
ABO carbon dioxide hydrogen nitrogen acetylene ethane isobutane nitrous oxide argon ethylene medical nonshatterable boron helium methane oxygen
butane hexaflouroethane neon sufur hexaflouride
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