Kind of gas | Maximum permitted filling density | Specification container required | ||
Percent by weight (see Note 1) | Percent by volume (see par. (f) of this section) | Type (see Note 2) | Minimum design pressure (psig) | |
Ammonia, anhydrous or Ammonia solutions with greater than 50 percent ammonia (see Notes 14 and 17) | 56 | 82, See Note 5 | DOT-51, MC-330, MC-331; See Notes 12, 17 and 27 | 265; See Note 17. |
Ammonia solutions with more than 35 percent but not more than 50 percent ammonia | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331; see Note 12 | 100; See par. (c) of this section. |
Bromotrifluoromethane (R-13B1 or H-1301); (See Note 9) | 133 | See Note 7 | DOT-51, MC-330, MC-331 | 365. |
Butadiene, stabilized | See par. (b) of this section | See par. (b) of this section | DOT-51, MC-330, MC-331 | 100. |
Carbon dioxide, refrigerated liquid | See par. (c)(1) of this section | 95 | ......do | 200; see Note 3. |
Chlorine | 125 | See Note 7 | DOT-51, MC-330, MC-331 | 225; See Notes 4 and 8. |
Chlorodifluoroethane (R-142b) (1-Chloro 1,1-difluoroethane); (See Note 9) | 100 | See Note 7 | DOT-51, MC-330, MC-331 | 100. |
Chlorodifluoromethane (R-22); (See Note 9) | 105 | See Note 7 | DOT-51, MC-330, MC-331 | 250. |
Chloropentafluoroethane (R-115); (See Note 9) | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331 | See par. (c) of this section. |
Chlorotrifluoromethane (R-13); (See Note 9) | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331 | See par. (c) of this section. |
Dichlorodifluoromethane (R-12); (See Note 9) | 119 | See Note 7 | DOT-51, MC-330, MC-331 | 150. |
Difluoroethane (R-152a); (See Note 9) | 79 | See Note 7 | DOT-51, MC-330, MC-331 | 150. |
Dimethyl ether (see Note 16) | 59 | ......do | ......do | 200. |
Dimethylamine, anhydrous | 59 | See Note 7 | DOT-51, MC-330, MC-331 | 150. |
Division 2.1, materials not specifically provided for in this table | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331 | See Note 18. |
Division 2.2, materials not specifically provided for in this table | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331 | See Notes 19 and 28. |
Division 2.3, Hazard Zone A, materials not specifically provided for in this table | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331; See Note 23 | See Note 20. |
Division 2.3, Hazard Zone B, materials not specifically provided for in this table | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331; See Note 23 | See Note 20. |
Division 2.3, Hazard Zone C, materials not specifically provided for in this table | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331; See Note 24 | See Note 21. |
Division 2.3, Hazard Zone D, materials not specifically provided for in this table | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331; See Note 25 | See Note 22. |
Ethane, refrigerated liquid | See par. (c) of this section | MC-331, MC-338 | 100; see Note 11. | |
Ethane-propane mixture, refrigerated liquid | See par. (c) of this section | MC-331, MC-338 | 275; see Note 11. | |
Hexafluoropropylene | 110 | See Note 7 | DOT-51, MC-330, MC-331 | 250. |
Hydrogen chloride, refrigerated liquid | 103.0 | See Note 7 | MC-331, MC-338 | 100; see Note 11. |
91.6 | ......do | ......do | 300; see Note 11. | |
86.7 | ......do | ......do | 450; see Note 11. | |
Liquefied petroleum gas (see Note 15) | See par. (b) of this section | See par. (b) of this section | DOT-51, MC-330, MC-331; See Note 26 | See par. (c) of this section. |
Methylacetylene-propadiene, stabilized (see Note 13) | 53 | 90 | DOT 51, MC 330, MC 331 | 200. |
Methylamine, anhydrous | 60 | See Note 7 | DOT-51, MC-330, MC-331. | |
Methyl chloride | 84 | 88.5 | ......do | 150. |
Methyl chloride (optional portable tank 2,000 pounds water capacity, fusible plug) | ......do | See Note 6 | DOT-51 | 225. |
Methyl mercaptan | 80 | 90 | DOT-51, MC-330, MC-331; See Note 23 | 100. |
Nitrous oxide, refrigerated liquid | See par. (c)(1) of this section | 95 | DOT-51, MC-330, MC-331 | 200; See Note 3. |
Refrigerant gas, n.o.s. or Dispersant gas, n.o.s. (See Note 9) | See par. (c) of this section | See Note 7 | DOT-51, MC-330, MC-331 | See par. (c) of this section. |
Sulfur dioxide (tanks not over 1,200 gallons water capacity) | 125 | 87.5 | DOT-51, MC-330, MC-331; See Note 24 | 150; See Note 4. |
Sulfur dioxide (tanks over 1,200 gallons water capacity) | 125 | 87.5 | DOT-51, MC-330, MC-331; See Note 24 | 125; See Note 4. |
Sulfur dioxide (optional portable tank 1,000-2,000 pounds water capacity, fusible plug) | 125 | See Note 6 | DOT-51; See Note 24 | 225. |
Trimethylamine, anhydrous | 57 | See Note 7 | DOT-51, MC-330, MC-331 | 150. |
Vinyl chloride | 84 (see Note 13) | See Note 7 | MC-330, MC-331 | 150. |
Vinyl fluoride, stabilized | 66 | ......do | ......do | 250; see Note 11. |
Vinyl methyl ether | 68 | See Notes 7 and 13 | ......do | 100. |
NOTE 1: Maximum filling density for liquefied gases is hereby defined as the percent ratio of the weight of gas in the tank to the weight of water that the tank will hold. For determining the water capacity of the tank in pounds, the weight of a gallon (231 cubic inches) of water at 60 °F. in air shall be 8.32828 pounds.
NOTE 2: See § 173.32 for authority to use other portable tanks and for manifolding cargo tanks, see paragraph (q) of this section. Specifications MC 330 cargo tanks may be painted as specified for MC 331 cargo tanks.
NOTE 3: If cargo tanks and portable tank containers for carbon dioxide, refrigerated liquid, and nitrous oxide, refrigerated liquid, are designed to conform to the requirements in Section VIII of the ASME Code for low temperature operation (IBR, see § 171.7 of this subchapter), the design pressure may be reduced to 100 psig or the controlled pressure, whichever is greater.
NOTE 4: Material must be steel. Packagings must have a corrosion allowance of 20 percent or 0.10 inch, whichever is less, added to the metal thickness. The minimum wall thickness for chlorine packagings is 0.300 inch for stainless steel or 0.625 inch for carbon steel, including corrosion allowance.
NOTE 5: Unlagged cargo tanks and portable tank containers for liquid anhydrous ammonia may be filled to 87.5 percent by volume provided the temperature of the anhydrous ammonia being loaded into such tanks is determined to be not lower than 30 °F. or provided the filling of such tanks is stopped at the first indication of frost or ice formation on the outside surface of the tank and is not resumed until such frost or ice has disappeared.
NOTE 6: Tanks equipped with fusible plugs must be filled by weight.
NOTE 7: Tanks must be filled by weight.
NOTE 8: Chlorine packagings may be shipped only if the contents are to be unloaded at one unloading point.
NOTE 9: This gas may be transported in authorized cargo tanks and portable tanks marked "DISPERSANT GAS," or "REFRIGERANT GAS."
NOTE 10: [Reserved]
NOTE 11: MC-330, MC-331 and MC-338 cargo tanks must be insulated. Cargo tanks must meet all the following requirements. Each tank must have a design service temperature of minus 100 °F., or no warmer than the boiling point at one atmosphere of the hazardous material to be shipped therein, whichever is colder, and must conform to the low-temperature requirements in Section VIII of the ASME Code. When the normal travel time is 24 hours or less, the tank's holding time as loaded must be at least twice the normal travel time. When the normal travel time exceeds 24 hours, the tank's holding time as loaded must be at least 24 hours greater than the normal travel time. The holding time is the elapsed time from loading until venting occurs under equilibrium conditions. The cargo tank must have an outer jacket made of steel when the cargo tank is used to transport a flammable gas.
NOTE 12: No aluminum, copper, silver, zinc or an alloy of any of these metals shall be used in packaging construction where it comes into contact with the lading.
NOTE 13: All parts of valves and safety devices in contact with contents of tank must be of a metal or other material suitably treated if necessary, which will not cause formation of any acetylides.
NOTE 14: Specifications MC 330 and MC 331 cargo tanks constructed of other than quenched and tempered steel "(NQT)" are authorized for all grades of anhydrous ammonia. Specifications MC 330 and MC 331 cargo tanks constructed of quenched and tempered steel "(QT)" (see marking requirements of § 172.328(c) of this subchapter) are authorized for anhydrous ammonia having a minimum water content of 0.2 percent by weight. Any tank being placed in anhydrous ammonia service or a tank which has been in other service or has been opened for inspection, test, or repair, must be cleaned of the previous product and must be purged of air before loading. See § 172.203(h) of this subchapter for special shipping paper requirements.
NOTE 15: Specifications MC 330 and MC 331 cargo tanks constructed of other than quenched and tempered steel (NQT) are authorized for all grades of liquefied petroleum gases. Only grades of liquefied petroleum gases determined to be "noncorrosive" are authorized in Specification MC 330 and MC 331 cargo tanks constructed of quenched and tempered steel (QT). "Noncorrosive" means the corrosiveness of the gas does not exceed the limitations for classification 1 of the ASTM Copper Strip Classifications when tested in accordance with ASTM D 1838, "Copper Strip Corrosion by Liquefied Petroleum (LP) Gases" (IBR, see § 171.7 of this subchapter). (For (QT) and (NQT) marking requirements, see § 172.328(c) of this subchapter. For special shipping paper requirements, see § 172.203(h) of this subchapter.)
NOTE 16: Openings, inlets, and outlets on MC 330 and MC 331 cargo tanks must conform to § 178.337-8(a) of this subchapter. MC 330 and MC 331 cargo tanks must be equipped with emergency discharge control equipment as specified in § 178.337-11(a) of this subchapter.
NOTE 17: A Specification MC-330 or MC-331 cargo tank or a nonspecification cargo tank meeting, and marked in conformance with, the edition of the ASME Code in effect when it was fabricated, may be used for the transportation of anhydrous ammonia if it:
NOTE 18: The minimum packaging design pressure must not be less than the vapor pressure at the reference temperature of the lading plus one percent or 173.4 kPa (25 psig), whichever is less.
NOTE 19: The minimum packaging design pressure must not be less than the vapor pressure at the reference temperature of the lading.
NOTE 20: The minimum packaging design pressure must not be less than 1.5 times the vapor pressure of the lading at 46 °C (115 °F).
NOTE 21: The minimum packaging design pressure must not be less than 1.3 times the vapor pressure of the lading at 46 °C (115 °F).
NOTE 22: The minimum packaging design pressure must not be less than 1.1 times the vapor pressure of the lading at 46 °C (115 °F).
NOTE 23: Packagings must be made of stainless steel except that steel other than stainless steel may be used in accordance with the provisions of § 173.24b(b) of this part. Thickness of stainless steel for shell and heads must be the greater of 7.62 mm (0.300 inch) or the thickness required for the packaging at its minimum design pressure.
NOTE 24: Packagings must be made of stainless steel except that steel other than stainless steel may be used in accordance with the provisions of § 173.24b(b) of this part. Thickness of stainless steel for shell and heads must be the greater of 6.35 mm (0.250 inch) or the thickness required for the packaging at its minimum design pressure. For sulphur dioxide, this Note does not apply until October 1, 1994.
NOTE 25: Packagings must be made of stainless steel except that steel other than stainless steel may be used in accordance with the provisions of § 173.24b(b) of this part. Thickness for shell and heads must be as calculated for the packaging at its minimum design pressure.
NOTE 26: Non-specification cargo tanks may be used for the transportation of liquefied petroleum gas, subject to the conditions prescribed in paragraph (k) of this section.
NOTE 27: Non-specification cargo tanks may be used for transportation of Ammonia, anhydrous and ammonia solutions with greater than 50% ammonia, subject to the conditions prescribed in paragraph (m) of this section.
NOTE 28: For UN1080, Sulfur hexafluoride, a non-specification cargo tank that otherwise conforms to a DOT Specification MC 331 cargo tank except for design pressure and capacity is authorized. Design pressure may not exceed 600 psig. The water capacity range for each tank is 15 to 500 gallons.
Maximum specific gravity of the liquid material at 60 °F. | Maximum permitted filling density in percent of the water-weight capacity of the tanks (percent) See Note 1 | |
1200 gallons or less | Over 1200 gallons | |
0.473 to 0.480 | 38 | 41 |
0.481 to 0.488 | 39 | 42 |
0.489 to 0.495 | 40 | 43 |
0.496 to 0.503 | 41 | 44 |
0.504 to 0.510 | 42 | 45 |
0.511 to 0.519 | 43 | 46 |
0.520 to 0.527 | 44 | 47 |
0.528 to 0.536 | 45 | 48 |
0.537 to 0.544 | 46 | 49 |
0.545 to 0.552 | 47 | 50 |
0.553 to 0.560 | 48 | 51 |
0.561 to 0.568 | 49 | 52 |
0.569 to 0.576 | 50 | 53 |
0.577 to 0.584 | 51 | 54 |
0.585 to 0.592 | 52 | 55 |
0.593 to 0.600 | 53 | 56 |
0.601 to 0.608 | 54 | 57 |
0.609 to 0.617 | 55 | 58 |
0.618 to 0.626 | 56 | 59 |
0.627 and over | 57 | 60 |
NOTE 1: Filling is permitted by volume provided the same filling density is used as permitted by weight, except when using fixed length dip tube or other fixed maximum liquid level indicators (paragraph (f) of this section), in which case the maximum permitted filling density shall not exceed 97 percent of the maximum permitted filling density by weight contained in the table.
Kind of gas | Gaging device permitted for filling purposes |
Anhydrous ammonia | Rotary tube; adjustable slip tube; fixed length dip tube. |
Anhydrous dimethylamine | None. |
Anhydrous monomethylamine | Do. |
Anhydrous trimethylamine | Do. |
Aqua ammonia solution containing anhydrous ammonia | Rotary tube; adjustable slip tube; fixed length dip tube. |
Butadiene, stabilized | Do. |
Carbon dioxide, refrigerated liquid | Do. |
Chlorine | None. |
Dichlorodifluoromethane | Do. |
Difluoroethane | Do. |
Difluoromonochloroethane | Do. |
Dimethyl ether | Do. |
Ethane, refrigerated liquid | Rotary tube; adjustable slip tube; fixed length dip tube. |
Ethane-propane mixture, refrigerated liquid | Do. |
Hexafluoropropylene | None. |
Hydrogen chloride, refrigerated liquid | Do. |
Liquefied petroleum gases | Rotary tube; adjustable slip tube; fixed length dip tube. |
Methyl chloride | Fixed length dip tube. |
Methyl mercaptan | Rotary tube; adjustable slip tube; fixed length dip tube. |
Monochlorodifluoromethane | None. |
Nitrous oxide, refrigerated liquid | Rotary tube; adjustable slip tube; fixed length dip tube. |
Methylacetylenepropadiene, stabilized | Do. |
Refrigerant gas, n.o.s. or Dispersant gas, n.o.s | None. |
Sulfur dioxide | Fixed length dip tube. |
Vinyl chloride | None. |
Vinyl fluoride, inhibited | Do. |
§ 173.315(n)(1) (*) | Material | Delivery service | Required emergency discharge control capability |
(i) | Division 2.2 materials with no subsidiary hazard, excluding anhydrous ammonia | All | None. |
(ii) | Division 2.3 materials | All | Paragraph (n)(2) of this section. |
(iii) | Division 2.2 materials with a subsidiary hazard, Division 2.1 materials, and anhydrous ammonia | Other than metered delivery service | Paragraph (n)(2) of this section. |
(iv) | Division 2.2 materials with a subsidiary hazard, Division 2.1 materials, and anhydrous ammonia in a cargo tank motor vehicle with a capacity of 13,247.5 L (3,500 water gallons) or less | Metered delivery service | Paragraph (n)(3) of this section. |
(v) | Division 2.2 materials with a subsidiary hazard, Division 2.1 materials, and anhydrous ammonia in a cargo tank motor vehicle with a capacity greater than 13,247.5 L (3,500 water gallons) | Metered delivery service | Paragraph (n)(3) of this section, and, for obstructed view deliveries where permitted by § 177.840(p) of this subchapter, paragraph (n)(2) or (n)(4) of this section. |
(vi) | Division 2.2 materials with a subsidiary hazard, Division 2.1 materials, and anhydrous ammonia in a cargo tank with a capacity of greater than 13,247.5 L (3,500 water gallons) | Both metered delivery and other than metered delivery service | Paragraph (n)(2) of this section, provided the system operates for both metered and other than metered deliveries; otherwise, paragraphs (n)(2) and (n)(3) of this section. |
49 C.F.R. §173.315
For FEDERAL REGISTER citations affecting § 173.315, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.