5 YEAR CARBON FIBER HYDRO-TEST

Luxfer and SCI has obtained authorization from the DOT to extend the hydrostatic retest period for carbon composite cylinders to five years from the current three years. This is for Luxfer carbon cylinders only and does not apply to Luxfer fully wrapped or hoop-wrapped fiberglass cylinders. The authorization takes effect immediately for any new Luxfer or SCI carbon cylinders manufactured under DOT exemption DOT-E 10915, and it is also retroactive to all Luxfer carbon cylinders previously manufactured under that exemption.

There are several advantages to a 5-year hydrostatic test requirement, rather than a 3-year requirement:

• 50% reduction in test costs. End users will now only have to do two retests over the 15 year life of the cylinder (years 5 and 10) instead of the previously required four retests (years3, 6, 9, and12).

• Improved inventory management.

• Less paperwork and administrative costs.
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RSPA SAFETY ADVISORY; HIGH PRESSURE COMPOSITE CYLINDERS

RSPA is alerting persons who own, use or are responsible for the maintenance of composite cylinders to a hazard. Damage may occur when a composite cylinder comes in contact with strong cleaners or other strong corrosive agents. RSPA is aware of ruptures involving two DOT E-8059 composite cylinders made with aluminum liners and wrapped with "S glass" fibers. The probable cause of both cylinder failures was stress-corrosion cracking of the fiberglass overwraps as a result of exposure to a strong corrosive agent.

RSPA investigated two failures involving self-contained breathing apparatus (SCBA) cylinders manufactured by EFI Corporation under exemption, DOT E-8059. The first failure occurred in March 1996 at the Humboldt (California) Fire Protection District. The second failure occurred this year at the Hawthorne (Florida) Volunteer Fire Department. Both cylinders failed while stored in fire trucks. Exponent-Failure Analysis Associates (FaAA) in Menlo Park, California, analyzed the cylinders. In its reports, FaAA concluded that the failures were caused by stress-corrosion cracking of the fiberglass wraps resulting from exposure to a strong corrosive agent. Fiberglass composite cylinders are particularly at risk for stress-corrosion cracking because the fibers are under constant tension due to the internal pressure. When the structural integrity of the overwrap is weakened, a catastrophic failure of a cylinder can occur that may result in serious injury or death.

Persons responsible for the care of composite cylinders should take measures to ensure that they do not come in contact with strong corrosive agents, that the cylinders are washed only with a mild soap and water solution, and that all recommendations of the cylinder manufacturer or distributor in regard to maintenance, requalification and use are carefully follwed.

Information available on this page has been reported to USFA by various organizations or obtained from government web sites. USFA is making this information available for informational purposes only.