Source: http://www.law.cornell.edu/cfr/text/49/173.314?qt-cfr_tabs=2
Timestamp: 2014-11-21 02:35:26
Document Index: 703508829

Matched Legal Cases: ['art 173', '§ 173', '§ 173', '§ 179', '§ 173', '§ 173']

49 CFR 173.314 - Compressed gases in tank cars and multi-unit tank cars. | LII / Legal Information Institute
CFR › Title 49 › Subtitle B › Chapter I › Subchapter C › Part 173 › Subpart G › Section 173.314 49 CFR 173.314 - Compressed gases in tank cars and multi-unit tank cars.
§ 173.314
For definitions of compressed gases, see § 173.115.
Tank car tanks containing compressed gases must not be shipped unless they were loaded by or with the consent of the owner thereof.
Tank car tanks must not contain gases capable of combining chemically and must not be loaded with any gas which combines chemically with the gas previously loaded therein, until all residue has been removed and interior of tank thoroughly cleaned.
For tanks of the DOT-106A and 110A class, the tanks must be placed in position and attached to car structure by the shipper.
Wherever the word “approved” is used in this part of the regulations, it means approval by the Association of American Railroads Committee on Tank Cars as prescribed in § 179.3 of this subchapter.
Each tank car used for the transportation of anhydrous ammonia or any material that meets the criteria of Division 2.1 or 2.3 must have gaskets for manway cover plates and for mounting of fittings designed (for temperature, application, media, pressure, and size) to create a positive seal so that, under conditions normally incident to transportation, there will not be an identifiable release of the material to the environment. The use of sealants to install gaskets is prohibited.
Authorized gases, filling limits for tank cars.
A compressed gas in a tank car or a multi-unit tank car must be offered for transportation in accordance with § 173.31 and this section. The gases listed below must be loaded and offered for transportation in accordance with the following table:
Outage and filling limits(see note 1)
Authorized tank car class(see note 11)
Authorized tank car specification(see note 12)
Notes: 1. The percent filling density for liquefied gases is hereby defined as the percent ratio of the mass of gas in the tank to the mass of water that the tank will hold. For determining the water capacity of the tank in kilograms, the mass of 1 L of water at 15.5 °C in air is 1 kg. (the mass of one gallon of water at 60 °F in air is 8.32828 pounds).
2. The liquefied gas must be loaded so that the outage is at least two percent of the total capacity of the tank at the reference temperature of 46 °C (115 °F) for a noninsulated tank; 43 °C (110 °F) for a tank having a thermal protection system incorporating a metal jacket that provides an overall thermal conductance at 15.5 °C (60 °F) of no more than 10.22 kilojoules per hour per square meter per degree Celsius (0.5 Btu per hour/per square foot/per degree F) temperature differential; and 41 °C (105 °F) for an insulated tank having an insulation system incorporating a metal jacket that provides an overall thermal conductance at 15.5 °C (60 °F) of no more than 1.5333 kilojoules per hour per square meter per degree Celsius (0.075 Btu per hour/per square foot/per degree F) temperature differential.
3. The requirements of § 173.24b(a) apply.
4. The gas pressure at 54.44 °C (130 °F.) in any non-insulated tank car may not exceed 7/10 of the marked test pressure, except that a tank may be charged with helium to a pressure 10 percent in excess of the marked maximum gas pressure at 54.44 °C (130 °F.) of each tank.
5. The liquid portion of the gas at -17.77 °C (0 °F.) must not completely fill the tank.
6. The maximum permitted filling density is 125 percent. The quantity of chlorine loaded into a single unit-tank car may not be loaded in excess of the normal lading weights nor in excess of 81.65 Mg (90 tons).