---
kind: "section"
citation: "49 C.F.R. § 173.338"
title: "49"
number: "173.338"
heading: "Tungsten hexafluoride."
url: "https://uscodex.org/cfr/49/173.338"
---

# §173.338. Tungsten hexafluoride.

- (a) Tungsten hexafluoride must be packaged in specification 3A, 3AA, 3BN, or 3E (§§ [178.36](/cfr/49/178.36.md), [178.37](/cfr/49/178.37.md), [178.39](/cfr/49/178.39.md), [178.42](/cfr/49/178.42.md) of this subchapter) cylinders. Cylinders must be equipped with a valve protection cap or be packed in a strong outer packaging meeting the provisions of [§ 173.40](/cfr/49/173.40.md). Outlets of any valves must be capped or plugged. As an alternative, the cylinder opening may be closed by the use of a metal plug. Specification 3E cylinders must be shipped in an overpack that meets the provisions of [§ 173.40](/cfr/49/173.40.md).
- (b) In place of the volumetric expansion test, DOT 3BN cylinders used in exclusive service may be given a complete external visual inspection in conformance with [part 180](/cfr/49/part180.md), [subpart C](/cfr/49/subpartC.md), of this subchapter, at the time such periodic requalification becomes due. Cylinders that undergo a complete external visual inspection, in place of the volumetric expansion test, must be condemned if removed from tungsten hexafluoride service.

## Notes

### Amendments

[74 FR 16143, Apr. 9, 2009, as amended at 75 FR 5395, Feb. 2, 2010]

### Authority

Authority: 49 U.S.C. 5101-5128, 44701; 49 CFR 1.81, 1.96 and 1.97.

### Amendments

[74 FR 16143, Apr. 9, 2009, as amended at 75 FR 5395, Feb. 2, 2010]