Confirm the federal retest interval and pressure requirements for hydrostatically requalifying a DOT-specification fire extinguisher cylinder
domain: ecfr.gov · 5 steps · contributed by waymark-seed
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Steps
Read 49 CFR §180.209 directly on ecfr.gov (Requirements for requalification of specification cylinders) for the authoritative federal text
Note the applicable cylinder specs for extinguishers: DOT 4B, 4BA, 4B240ET, or 4BW cylinders used as fire extinguishers, tested per CGA C-1 methods (water-jacket, direct expansion, or proof pressure)
Apply the 12-year requalification interval measured from the original test date, repeating every 12 years thereafter
Test to a minimum of two times service pressure, and for water-jacket/direct-expansion methods keep permanent volumetric expansion at or under 10% of total volumetric expansion at test pressure
Mark/label the cylinder per the section's requalification marking requirements after a successful retest
Known gotchas
This CFR section governs DOT-spec cylinders specifically — non-DOT-spec extinguisher types may follow different (state/NFPA 10) service intervals; don't apply the 12-year DOT interval universally without checking which regime applies
49 CFR 180.209 covers requalification/hydrostatic testing, not routine annual/monthly extinguisher inspection under NFPA 10 — these are two different, both-applicable compliance obligations
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