46 CFR §147.67

1. (a)Each halocarbon cylinder forming part of a clean agent fixed fire extinguishing system must be:
   1. (1)Retested at least once every 12 years and before recharging if it has been discharged and more than five years have elapsed since the last test; or
   2. (2)As an alternative, a cylinder conforming to the requirements of 49 CFR 180.209(g) may be given the complete external visual inspection in lieu of hydrostatic testing provided for by that section.
2. (b)A halocarbon cylinder must be removed from service if it:
   1. (1)Leaks;
   2. (2)Is dented, bulging, severely corroded, or otherwise weakened;
   3. (3)Has lost more than 5 percent of its tare weight; or
   4. (4)Has been involved in a fire.
3. (c)Flexible connections between cylinders and discharge piping for halocarbon fire extinguishing systems must be renewed or retested in accordance with section 7.3 of NFPA 2001 (incorporated by reference, see § 147.7).