Billing Code - PHMSA - Department of Transportation

(b) Filling limits. Cylinders must be filled so that at 50° C (122° F) the non-
gaseous phase does not exceed 95% of their water capacity and they are not completely
filled at 60° C (140° F). When filled, the internal pressure at 65° C (149° F) must not
exceed the test pressure of the cylinder. The vapor pressures and volumetric expansion
of all substances in the cylinders must be taken into account.
(c) Minimum service pressure. The minimum service pressure must be in
accordance with the design specifications of part 178 of this subchapter for the
propellant. In any case the minimum test pressure must not be less than 20 bar.
(d) Periodic inspection. The maximum requalification test period for cylinders
transporting chemical under pressure n.o.s. is 5 years.
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66. In § 173.340, paragraphs (c)(1), (c)(2), and (d) are revised to read as follows:
§ 173.340 Tear Gas Devices.
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(c) * * *
(1) In UN 4A, 4B, or 4N metal boxes or UN 4C1, 4C2, 4D, or 4F metal-strapped
wooden boxes. Functioning elements not assembled in grenades or devices must be in a
separate compartment of these boxes, or in inner or separate outer boxes, UN 4C1, 4C2,
4D, or 4F, and must be packed and cushioned so that they may not come in contact with
each other or with the walls of the box during transportation. Not more than 50 tear gas
devices and 50 functioning elements must be packed in one box, and the gross weight of
the outer box may not exceed 35 kg (77 pounds).
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