Table 1 to Paragraph (a)-Requalification of Cylinders1
Specification under which cylinder was made | Minimum test pressure (psig)2 | Requalification period (years) |
3 | 3000 psig | 5. |
3A, 3AA | 5/3 times service pressure, except non-corrosive service (see§ 180.209(g) ) | 5, 10, or 12 (see§ 180.209(b), (f), (h), and (j) ). |
3AL | 5/3 times service pressure | 5 or 12 (see § 180.209(j) and (m) 4). |
3AX, 3AAX | 5/3 times service pressure | 5. |
3B, 3BN | 2 times service pressure (see§ 180.209(g) ) | 5 or 10 (see§ 180.209(f) ). |
3E | Test not required | |
3HT | 5/3 times service pressure | 3 (see§§ 180.209(k) and 180.213(c) ). |
3T | 5/3 times service pressure or UE3 | 5. |
4AA480 | 2 times service pressure (see§ 180.209(g) ) | 5 or 10 (see§ 180.209(h) ). |
4B, 4BA, 4BW, 4B-240ET | 2 times service pressure, except non-corrosive service (see§ 180.209(g) ) | 5, 7, 10, or 12 (see§ 180.209(e), (f), and (j) ). |
4D, 4DA, 4DS | 2 times service pressure | 5. |
4E | 2 times service pressure, except non-corrosive service (see§ 180.209(g) ) | 5, 10, or 12 (see§ 180.209(e) ). |
4L | Test not required | |
8, 8AL | 10 or 20 (see§ 180.209(i) ). | |
Exemption or special permit cylinder | See current exemption or special permit, or UE3 as allowed by CGA C-20 (2014) | See current exemption or special permit. |
Foreign cylinder (see§ 173.301(j) of this subchapter for restrictions on use) | As marked on cylinder, but not less than 5/3 of any service or working pressure marking | 5 (see§§ 180.209(l) and 180.213(d)(2) ). |
1 Any cylinder not exceeding two inches outside diameter and less than two feet in length is excepted from volumetric expansion test.
2 For cylinders not marked with a service pressure, see § 173.301a(b) of this subchapter.
3 Minimum test pressure is not applicable to those cylinders and tubes requalified using ultrasonic examination.
4 This provision does not apply to cylinders used for carbon dioxide, fire extinguisher, or other industrial gas service.
Table 1 to Paragraph (a)-Requalification of Cylinders1
Specification under which cylinder was made | Minimum test pressure (psig)2 | Requalification period (years) |
3 | 3000 psig | 5. |
3A, 3AA | 5/3 times service pressure, except non-corrosive service (see§ 180.209(g) ) | 5, 10, or 12 (see§ 180.209(b), (f), (h), and (j) ). |
3AL | 5/3 times service pressure | 5 or 12 (see § 180.209(j) and (m) 4). |
3AX, 3AAX | 5/3 times service pressure | 5. |
3B, 3BN | 2 times service pressure (see§ 180.209(g) ) | 5 or 10 (see§ 180.209(f) ). |
3E | Test not required | |
3HT | 5/3 times service pressure | 3 (see§§ 180.209(k) and 180.213(c) ). |
3T | 5/3 times service pressure or UE3 | 5. |
4AA480 | 2 times service pressure (see§ 180.209(g) ) | 5 or 10 (see§ 180.209(h) ). |
4B, 4BA, 4BW, 4B-240ET | 2 times service pressure, except non-corrosive service (see§ 180.209(g) ) | 5, 7, 10, or 12 (see§ 180.209(e), (f), and (j) ). |
4D, 4DA, 4DS | 2 times service pressure | 5. |
4E | 2 times service pressure, except non-corrosive service (see§ 180.209(g) ) | 5, 10, or 12 (see§ 180.209(e) ). |
4L | Test not required | |
8, 8AL | 10 or 20 (see§ 180.209(i) ). | |
Exemption or special permit cylinder | See current exemption or special permit, or UE3 as allowed by CGA C-20 (2014) | See current exemption or special permit. |
Foreign cylinder (see§ 173.301(j) of this subchapter for restrictions on use) | As marked on cylinder, but not less than 5/3 of any service or working pressure marking | 5 (see§§ 180.209(l) and 180.213(d)(2) ). |
1 Any cylinder not exceeding two inches outside diameter and less than two feet in length is excepted from volumetric expansion test.
2 For cylinders not marked with a service pressure, see § 173.301a(b) of this subchapter.
3 Minimum test pressure is not applicable to those cylinders and tubes requalified using ultrasonic examination.
4 This provision does not apply to cylinders used for carbon dioxide, fire extinguisher, or other industrial gas service.
Table 2 to Paragraph (g)
Cylinders conforming to- | Used exclusively for- |
DOT 3A, DOT 3AA, DOT 3A480X, DOT 4AA480 | Anhydrous ammonia of at least 99.95% purity. |
DOT 3A, DOT 3AA, DOT 3A480X, DOT 3B, DOT 4B, DOT 4BA, DOT 4BW | Butadiene, inhibited, that is commercially free from corroding components. |
DOT 3A, DOT 3AA, DOT 3A480X, DOT 3B. DOT 4AA480, DOT 4B, DOT 4BA, DOT 4BW | Cyclopropane that is commercially free from corroding components. |
DOT 3A, DOT 3AA, DOT 3A480X, DOT 4B, DOT 4BA, DOT 4BW, DOT 4E | Chlorinated hydrocarbons and mixtures thereof that are commercially free from corroding components. |
DOT 3A, DOT 3AA, DOT 3A480X, DOT 4B, DOT 4BA, DOT 4BW, DOT 4E | Fluorinated hydrocarbons and mixtures thereof that are commercially free from corroding components. |
DOT 3A, DOT 3AA, DOT 3A480X, DOT 3B, DOT 4B, DOT 4BA, DOT 4BW, DOT 4E | Liquefied hydrocarbon gas that is commercially free of corroding components. |
DOT 3A, DOT 3AA, DOT 3A480X, DOT 3B, DOT 4B, DOT 4BA, DOT 4BW, DOT 4E | Liquefied petroleum gas that meets the detail requirements limits in Table 1 of ASTM 1835, Standard Specification for Liquefied Petroleum (LP) Gases (incorporated by reference; see § 171.7 of this subchapter) or an equivalent standard containing the same limits. |
DOT 3A, DOT 3AA, DOT 3B, DOT 4B, DOT 4BA, DOT 4BW, DOT 4E | Methylacetylene-propadiene, stabilized, that is commercially free from corroding components. |
DOT 3A, DOT 3AA, DOT 3B, DOT 4B, DOT 4BA, DOT 4BW, DOT 4E | Propylene that is commercially free from corroding components. |
DOT 3A, DOT 3AA, DOT 3B, DOT 4B, DOT 4BA, DOT 4BW | Anhydrous mono, di, trimethylamines that are commercially free from corroding components. |
DOT 4B240, DOT 4BW240 | Ethyleneimine, stabilized. |
DOT 4BW | Alkali metal alloys, liquid, n.o.s., Alkali metal dispersions or Alkaline earth metal dispersions, Potassium, Potassium Sodium alloys and Sodium that are commercially free of corroding components. |
Date of cylinder manufacture | Shell (visual inspection) requalification | Porous filler requalification | ||
Initial | Subsequent | Intial | Subsequent | |
Before January 1, 1991 | Before January 1, 2001 | 10 years | Before January 1, 2011 | Not required. |
On or after January 1, 1991 | 10 years1 | 10 years | 5 to 20 years2 | Not required. |
1 Years from the date of cylinder manufacture.
2 No sooner than 5 years, and no later than 20 years from the date of manufacture.
Table 4 to Paragraph (m)-Requalification and Inspection of DOT-3AL Cylinders Made of Aluminum Alloy 6351-T6
Requalification requirement | Examination procedure1 | Sustained Load Cracking Condemnation Criteria2 | Requalification period (years) |
Eddy current examination combined with visual inspection | Eddy current-In accordance with Appendix C of this part Visual inspection-In accordance with CGA Pamphlet C-6.1 (IBR; see § 171.7 of this subchapter) | Any crack in the neck or shoulder of 2 thread lengths or more | 5 |
1 The requalifier performing eddy current must be familiar with the eddy current equipment and must standardize (calibrate) the system in accordance with the requirements provided in Appendix C to this part.
2 The eddy current must be applied from the inside of the cylinder's neck to detect any sustained load cracking that has expanded into the neck threads.
49 C.F.R. §180.209
At 71 FR 54397, Sept. 14, 2006, § 180.209 was amended in (a)(1) table 1; however, because of the inaccurate amendatory language, the amendment could not be incorporated.