Ask X3What does 49 CFR 173.163 (Hydrogen fluoride) require?
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Based on 49 CFR 173.163, hydrogen fluoride (anhydrous hydrofluoric acid) must be packaged using one of the following methods:
1. Approved US DOT Cylinders:
- Specification 3, 3A, 3AA, 3B, 3BN, or 3E cylinders.
- Specification 4B, 4BA, or 4BW cylinders (Note: Brazed cylinders of these types are not allowed).
- *Filling limit:* The filling density cannot exceed 85% of the cylinder's water weight capacity.
- *Inspection alternative:* Cylinders used exclusively for this service can receive a complete external visual inspection (under part 180, subpart C) instead of the periodic volumetric expansion test when requalification is due.
2. UN Cylinders:
- Must meet the specifications in part 178 with a minimum test pressure of 10 bar and a maximum filling ratio of 0.84.
Additionally, under 49 CFR 173.163, any cylinder removed from hydrogen fluoride service must either be condemned in accordance with § 180.205 or rendered incapable of holding pressure at the owner's direction.