When to Have Your Cylinder Tested


Each specification cylinder that becomes due for periodic requalification, as specified in the following table, must be requalified and marked in conformance with the requirements of this subpart. Requalification records must be maintained in accordance with §180.215. Table 1 follows:

Table 1—Requalification of Cylinders

Specification under which cylinder was made Minimum test pressure
(psig)
Requalification period (years)
DOT 3 3000 psig 5
DOT 3A, 3AA 5/3 times service pressure, except noncorrosive service 5, 10, or 12
DOT 3AL 5/3 times service pressure 5 or 12
DOT 3AX, 3AAX 5/3 times service pressure 5
3B, 3BN 2 times service pressure 5 or 10
3E Test not required
3HT 5/3 times service pressure 3
3T 5/3 times service pressure 5
4AA480 2 times service pressure 5 or 10
4B, 4BA, 4BW, 4B–240ET 2 times service pressure, except non-corrosive service 5, 10, or 12
4D, 4DA, 4DS 2 times service 5
DOT 4E 2 times service pressure, except non-corrosive 5
4L Test not required
8, 8AL 10 or 20
Exemption or special permit cylinder See current exemption or special permit See current exemption or special permit
Foreign cylinder As marked on cylinder, but not less than 5/3 of any service or working pressure marking 5

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