Ask X3What does 49 CFR 173.338 (Tungsten hexafluoride) require?
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Based on 49 CFR 173.338, tungsten hexafluoride must be packaged in specification 3A, 3AA, 3BN, or 3E cylinders.
Here are the practical requirements for your fleet:
* Valve Protection and Closures: Cylinders must either be equipped with a valve protection cap or be packed in a strong outer packaging that meets the provisions of § 173.40. All valve outlets must be capped or plugged, or the cylinder opening may be closed using a metal plug as an alternative.
* Specification 3E Cylinders: These specific cylinders must always be shipped in an overpack that meets the provisions of § 173.40.
* DOT 3BN Cylinders in Exclusive Service: Instead of a volumetric expansion test, these cylinders may undergo a complete external visual inspection (in conformance with part 180, subpart C) when their periodic requalification is due. However, if a cylinder undergoes this visual inspection instead of the volumetric expansion test, it must be condemned if it is ever removed from tungsten hexafluoride service.