Compliance Dates-Inspections and Test Under § 180.407(c)
Test or inspection (cargo tank specification, configuration, and service) | Date by which first test must be completed (see Note 1) | Interval period after first test |
External Visual Inspection: | ||
All cargo tanks designed to be loaded by vacuum with full opening rear heads | September 1, 1991 | 6 months. |
All other cargo tanks | September 1, 1991 | 1 year. |
Internal Visual Inspection: | ||
All insulated cargo tanks, except MC 330, MC 331, MC 338 (see Note 4) | September 1, 1991 | 1 year. |
All cargo tanks transporting lading corrosive to the tank | September 1, 1991 | 1 year. |
MC 331 cargo tanks less than 3,500 gallons water capacity in dedicated propane service constructed of nonquenched and tempered NQT SA-612 steel (see Note 5) | 10 years. | |
All other cargo tanks, except MC 338 | September 1, 1995 | 5 years. |
Lining Inspection: | ||
All lined cargo tanks transporting lading corrosive to the tank | September 1, 1991 | 1 year. |
Leakage Test: | ||
MC 330 and MC 331 cargo tanks in chlorine service | September 1, 1991 | 2 years. |
All other cargo tanks except MC 338 | September 1, 1991 | 1 year. |
Pressure Test: | ||
(Hydrostatic or pneumatic) (See Notes 2 and 3) | ||
All cargo tanks which are insulated with no manhole or insulated and lined, except MC 338 | September 1, 1991 | 1 year. |
All cargo tanks designed to be loaded by vacuum with full opening rear heads | September 1, 1992 | 2 years. |
MC 330 and MC 331 cargo tanks in chlorine service | September 1, 1992 | 2 years. |
MC 331 cargo tanks less than 3,500 gallons water capacity in dedicated propane service constructed of nonquenched and tempered NQT SA-612 steel (See Note 5) | 10 years. | |
All other cargo tanks | September 1, 1995 | 5 years. |
Thickness Test: | ||
All unlined cargo tanks transporting material corrosive to the tank, except MC 338 | September 1, 1992 | 2 years. |
Note 1: If a cargo tank is subject to an applicable inspection or test requirement under the regulations in effect on December 30, 1990, and the due date (as specified by a requirement in effect on December 30, 1990) for completing the required inspection or test occurs before the compliance date listed in table I, the earlier date applies.
Note 2: Pressure testing is not required for MC 330 or MC 331 cargo tanks in dedicated sodium metal service.
Note 3: Pressure testing is not required for uninsulated lined cargo tanks, with a design pressure MAWP 15 psig or less, which receive an external visual inspection and lining inspection at least once each year.
Note 4: Insulated cargo tanks equipped with manholes or inspection openings may perform either an internal visual inspection in conjunction with the external visual inspection or a hydrostatic or pneumatic pressure-test of the cargo tank.
Note 5: A 10-year inspection interval period also applies to cargo tanks constructed of NQT SA-202 or NQT SA-455 steel provided the materials have full-size equivalent (FSE) Charpy vee notch (CVN) energy test data that demonstrated 75% shear-area ductility at 32 °F with an average of 3 or more samples [GREATER THAN]15 ft-lb FSE with no sample [LESS THAN]10 ft-lb FSE.
Table 1 to Paragraph (g)(1)(iv)
Specification | Test pressure |
MC 300, 301, 302, 303, 305, 306 | The test pressure on the name plate or specification plate, 20.7 kPa (3 psig) or design pressure, whichever is greater. |
MC 304, 307 | The test pressure on the name plate or specification plate, 275.8 kPa (40 psig) or 1.5 times the design pressure, whichever is greater. |
MC 310, 311, 312 | The test pressure on the name plate or specification plate, 20.7 kPa (3 psig) or 1.5 times the design pressure, whichever is greater. |
MC 330, 331 | The test pressure on the name plate or specification plate, 1.5 times either the MAWP or the re-rated pressure, whichever is applicable. |
MC 338 | The test pressure on the name plate or specification plate, 1.25 times either the MAWP or the re-rated pressure, whichever is applicable. |
DOT 406 | The test pressure on the name plate or specification plate, 34.5 kPa (5 psig) or 1.5 times the MAWP, whichever is greater. |
DOT 407 | The test pressure on the name plate or specification plate, 275.8 kPa (40 psig) or 1.5 times the MAWP, whichever is greater. |
DOT 412 | The test pressure on the name plate or specification plate, or 1.5 times the MAWP, whichever is greater. |
Table I-In-Service Minimum Thickness for MC 300, MC 303, MC 304, MC 306, MC 307, MC 310, MC 311, and MC 312 Specification Cargo Tanks Constructed of Steel and Steel Alloys
Minimum manufactured thickness (US gauge or inches) | Nominal decimal equivalent for (inches) | In-service minimum thickness reference (inches) |
19 | 0.0418 | 0.038 |
18 | 0.0478 | 0.043 |
17 | 0.0538 | 0.048 |
16 | 0.0598 | 0.054 |
15 | 0.0673 | 0.061 |
14 | 0.0747 | 0.067 |
13 | 0.0897 | 0.081 |
12 | 0.1046 | 0.094 |
11 | 0.1196 | 0.108 |
10 | 0.1345 | 0.121 |
9 | 0.1495 | 0.135 |
8 | 0.1644 | 0.148 |
7 | 0.1793 | 0.161 |
3/16 | 0.1875 | 0.169 |
1/4 | 0.2500 | 0.225 |
5/16 | 0.3125 | 0.281 |
3/8 | 0.3750 | 0.338 |
Table II-In-Service Minimum Thickness for MC 301, MC 302, MC 304, MC 305, MC 306, MC 307, MC 311, and MC 312 Specification Cargo Tanks Constructed of Aluminum and Aluminum Alloys
Minimum manufactured thickness | In-service minimum thickness (inches) |
0.078 | 0.070 |
0.087 | 0.078 |
0.096 | 0.086 |
0.109 | 0.098 |
0.130 | 0.117 |
0.141 | 0.127 |
0.151 | 0.136 |
0.172 | 0.155 |
0.173 | 0.156 |
0.194 | 0.175 |
0.216 | 0.194 |
0.237 | 0.213 |
0.270 | 0.243 |
0.360 | 0.324 |
0.450 | 0.405 |
0.540 | 0.486 |
49 C.F.R. §180.407
For FEDERAL REGISTER citations affecting § 180.407, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.