49 CFR 172 Special Provision B27 (B-Codes)

These provisions apply only to bulk packagings. Except as otherwise provided in this subchapter, these special provisions do not apply to UN portable tanks or IBCs.

Code	B27
Description	Tanks must have a service pressure of 1,034 kPa (150 psig). Tank car tanks must have a test pressure rating of 1,379 kPa (200 psig). Lading must be blanketed at all times with a dry inert gas at a pressure not to exceed 103 kPa (15 psig).
HazMat with this Code	UN 2257 - Potassium UN 1422 - Potassium sodium alloys, liquid UN 3404 - Potassium sodium alloys, solid UN 1420 - Potassium, metal alloys, liquid UN 3403 - Potassium, metal alloys, solid

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