4E · Periodic requalification
For 4E, test or inspection is Periodic requalification; interval is 5, 10, or 12; minimum test pressure is 2 times service pressure, except non-corrosive service; regulation section is 49 CFR § 180.209, recorded from its source on 2026-08-06; source re-checked 2026-09-30.
- Container specification
- 4E verified
- Test or inspection
- Periodic requalification our reading
- Interval
- 5, 10, or 12 verified
- Minimum test pressure
- 2 times service pressure, except non-corrosive service verified
- Regulation section
- 49 CFR § 180.209
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
4E | 2 times service pressure, except non-corrosive service ( see § 180.209(g)) | 5, 10, or 12 ( see § 180.209(e)).
— law.cornell.edu, retrieved 2026-08-06
Source
- law.cornell.eduhttps://www.law.cornell.edu/cfr/text/49/180.209