In response to a petition from the National Propane Gas Association (NPGA), US DOT PHMSA issued a Final Rule to lengthen some requalification periods for certain DOT 4-series cylinders in non-corrosive gas service.
The Final Rule
amends 49 CFR 180.209(e) and takes effect on November 30, 2020.
The Rule authorizes:
- 12-year initial and subsequent requalification periods for volumetric expansion testing; and
- A 12-year initial requalification period for proof pressure testing.
Note: The 10-year subsequent requalification period for proof pressure testing remains in effect.
To qualify for the 12-year requalification period for volumetric expansion testing (instead of the previous 5-year period), cylinders must be:
- Made in conformance with DOT specs 4B, 4BA, 4BW, or 4E;
- Protected externally by a suitable corrosion-resistant coating;
- Exclusively used for non-corrosive gas; and
- Commercially free from corroding components.
The Final Rule appeared in the Federal Register
on October 30, 2020.
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