Final Rule Alert: PHMSA Amends 4-series Cylinder Requalification Periods

Posted on 11/3/2020 by Roger Marks

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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Tags: 49 CFR 180.209, cylinders, hazardous materials, new rules

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