Research and Special Programs Admin., DOT § 174.67

trailer, or freight container must be se- (4) For COFC service, the container cured on the flatcar so that it cannot support and securement systems con- change position during transit. form to requirements in Specification [Amdt. 174–26, 41 FR 16092, Apr. 15, 1976, as M–952 ‘‘Intermodal Container Support amended by Amdt. 174–26A, 41 FR 40685, Sept. and Securement Systems for Freight 20, 1976; Amdt. 174–38, 45 FR 32698, May 19, Cars’’, of the AAR specification for 1980; Amdt. 174–39, 45 FR 81572, Dec. 11, 1980; ‘‘Specially Equipped Freight Car and Amdt. 174–59, 51 FR 5974, Feb. 18, 1986; Amdt. Intermodal Equipment’’; 174–68, 57 FR 45464, Oct. 1, 1992; Amdt. 174–79, (5) If transported in a well car— 59 FR 64744, Dec. 15, 1994] (i) The tank is not in a double- § 174.63 Portable tanks, IM portable stacked configuration (i.e., no freight tanks, IBCs, cargo tanks, and multi- container or portable tank is placed unit tank car tanks. above or below the tank); and (a) A carrier may not transport a (ii) The tank is transported in the bulk packaging (e.g., portable tank, IM well with its outlet valve facing out- portable tank, IBC, cargo tank, or ward towards the end of the well and multi-unit tank car tank) containing a away from any adjacent tank or con- hazardous material in container-on- tainer; and flatcar (COFC) or trailer-on-flatcar (6) All securement fittings shall be (TOFC) service except as authorized by fully engaged and in the locked posi- this section or unless approved for tion, provided; however, if the tank is transportation by the Associate Ad- transported in a well car, it must be ministrator for Safety, FRA. loaded into a well appropriate for the (b) A bulk packaging containing a length of the container and any void hazardous material (including IM 101 filling device present must be secured and IM 102 when appropriate according in its designed appropriate position. to dimensions and weight distribution) (d) An approval in effect on February may be transported inside a fully 28, 1991 for the transportation of port- closed transport vehicle or fully closed able tanks or IM portable tanks in freight container provided it is prop- TOFC or COFC service expires on the erly secured with a restraint system date stated in the approval letter or that will prevent it from changing po- sition, sliding into other packages, or June 15, 1995, whichever is later. contacting the side or end walls (in- (e) A carrier may not transport a cluding doors) under conditions nor- cargo tank or multi-unit tank car tank mally incident to transportation. containing a hazardous material in (c) When not transported in conform- TOFC or COFC service unless approved ance with and subject to paragraph (b) for such service by the Associate Ad- of this section, a bulk packaging may ministrator for Safety, FRA. However, be transported in COFC service or in the event of an accident or incident, TOFC service subject to the following no such approval is necessary for the conditions as applicable: transportation of a cargo tank con- (1) The bulk packaging contains a taining a hazardous material in TOFC material packaged in accordance with service under the following condi- § 173.240, 173.241, 173.242, or 173.243 of tion(s): this subchapter; (1) There is an emergency need for (2) The tank and flatcar conform to the cargo tank in order to mitigate the requirements in AAR 600 of the AAR consequences of an incident; and Specifications for Tank Cars, Speci- (2) Movement of the cargo tank is fication M–1002, entitled ‘‘Specifica- limited to transportation necessary for tions for Acceptability of Tank Con- emergency purposes. tainers’’; (3) For TOFC service, the trailer [Amdt. 174–79, 59 FR 64744, Dec. 15, 1994, as chassis conforms to requirements in amended by 66 FR 45383, Aug. 28, 2001] paragraphs 3, 4, 5, and 6 of AAR Speci- fication M–943 ‘‘Container Chassis For § 174.67 Tank car unloading. TOFC Service’’ of the AAR specifica- (a) In unloading tank cars, the fol- tion for ‘‘Specially Equipped Freight lowing rules must be observed (see sub- Car and Intermodal Equipment’’; part F of this part for gases):

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(1) Unloading operations must be per- (2) Hinged and bolted type. All nuts formed only by reliable persons prop- must be unscrewed one complete turn, erly instructed in unloading hazardous after which same precautions as pre- materials and made responsible for scribed for screw type cover must be careful compliance with this part. observed. (2) Brakes must be set and wheels (3) Interior type. All dirt and cinders blocked on all cars being unloaded. must be carefully removed from around (3) Caution signs must be so placed the cover before the yoke is unscrewed. on the track or cars to give necessary (c) When the car is unloaded through warning to persons approaching the a bottom outlet valve, the manhole cars from the open end of a siding and cover must be adjusted as follows: must be left up until after the cars are (1) Screw type. The cover must be put unloaded and disconnected from the in place, but not entirely screwed discharge connection. The signs must down, so that air may enter the tank be of metal or other comparable mate- through the vent holes in threaded rial, at least 30 cm (12 inches) high by flange of the cover. 38 cm (15 inches) wide in size, and bear (2) Hinged and bolted type. A non-me- the words, ‘‘STOP—Tank Car Con- tallic block must be placed under one nected’’, or ‘‘STOP—Men at Work’’, the edge of the cover. word ‘‘STOP’’ being in letters at least (3) Interior type. The screw must be 10 cm (3.9 inches) high and the other tightened up in the yoke so that the words in letters at least 5 cm (2 inches) cover is brought up within one-half high. The letters must be white on a inch of the closed position. blue background. (d) When unloading through the bot- (4) Before a manhole cover or outlet tom outlet of a car equipped with an valve cap is removed from a tank car, interior manhole type cover, and in the car must be relieved of all interior each case where unloading is done pressure by cooling the tank with through the manhole (unless a special water or by venting the tank by raising cover with a safety vent opening and a the safety valve or opening the dome tight connection for the discharge out- vent at short intervals. However, if let is used), the manhole must be pro- venting to relieve pressure will cause a tected by asbestos or metal covers dangerous amount of vapor to collect against the entrance of sparks or other outside the car, venting and unloading sources of ignition of vapor, or by must be deferred until the pressure is being covered and surrounded with wet reduced by allowing the car to stand burlap or similar cloth material. The overnight or otherwise cooling the con- burlap or other cloth must be kept tents. These precautions are not nec- damp by the replacement or the appli- essary when the car is equipped with a cation of water as needed. manhole cover which hinges inward or (e) Seals or other substances must with an inner manhole cover which not be thrown into the tank and the does not have to be removed to unload contents may not be spilled over the the car, and when pressure is relieved car or tank. by piping vapor into a condenser or (f) The valve rod handle or control in storage tank. the dome must be operated several (b) After the pressure is released, the times to see that outlet valve in bot- seal must be broken and the manhole tom of tank is on its seat before valve cover removed as follows: cap is removed. (1) Screw type. The cover must be (g) The valve cap, or the reducer loosened by placing a bar between the when a large outlet is to be used, must manhole cover lug and knob. After two be removed with a suitable wrench complete turns, so that vent openings after the set screws are loosened and a are exposed, the operation must be pail must be placed in position to catch stopped, and if there is any sound of es- any liquid that may be in the outlet caping vapor, the cover must be chamber. If the valve cap or reducer screwed down tightly and the interior does not unscrew easily, it may be pressure relieved as prescribed in para- tapped lightly with a mallet or wooden graph (a)(4) of this section, before block in an upward direction. If leak- again attempting to remove the cover. age shows upon starting the removal,

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the cap or reducer may not be entirely unloading connections must be discon- unscrewed. Sufficient threads must be nected. All valves must first be tightly left engaged and sufficient time al- closed, and the closures of all other lowed to permit controlled escape of openings securely applied. any accumulation of liquid in the out- (k) As soon as a tank car is com- let chamber. If the leakage stops or the pletely unloaded, all valves must be rate of leakage diminishes materially, made tight by the use of a bar, wrench the cap or reducer may be entirely re- or other suitable tool, the unloading moved. If the initial rate of leakage connections must be removed and all continues, further efforts must be other closures made tight. made to seat the outlet valve (see para- (l) Railroad defect cards may not be graph (f) of this section). If this fails, removed. the cap or reducer must be screwed up (m) If oil or gasoline has been spilled tight and the tank must be unloaded on the ground around connections, it through the dome. If upon removal of must be covered with fresh, dry sand or the outlet cap the outlet chamber is dirt. found to be blocked with frozen liquid (n) All tools and implements used in or any other matter, the cap must be connection with unloading must be replaced immediately and a careful ex- kept free of oil, dirt, and grit. amination must be made to determine whether the outlet casting has been [Amdt. 174–26, 41 FR 16092, Apr. 15, 1976, as cracked. If the obstruction is not fro- amended by Amdt. 174–26A, 41 FR 40685, Sept. zen liquid, the car must be unloaded 20, 1976; Amdt. 174–43, 48 FR 27699, June 16, through the dome. If the obstruction is 1983; Amdt. 174–68, 55 FR 52678, Dec. 21, 1990; frozen liquid and no crack has been 56 FR 66280, Dec. 20, 1991; Amdt. 174–81, 60 FR found in the outlet casting, the car 49111, Sept. 21, 1995; Amdt. 174–83, 61 FR 28678, June 5, 1996] may, if circumstances require it, be un- loaded from the bottom by removing § 174.81 Segregation of hazardous ma- the cap and attaching unloading con- terials. nections immediately. Before opening the valve inside the tank car, steam (a) This section applies to materials must be applied to the outside of the which meet one or more of the hazard outlet casting or wrap casting with classes defined in this subchapter and burlap or other rags and hot water are in packages which are required to must be applied to melt the frozen liq- be labeled or placarded under the pro- uid. visions of part 172 of this subchapter. (h) Unloading connections must be (b) When a rail car is to be trans- securely attached to unloading pipes ported by vessel, other than a ferry on the dome or to the bottom discharge vessel, hazardous materials on or with- outlets before any discharge valves are in that rail car must be stowed and opened. segregated in accordance with (i) Tank cars may not be allowed to § 176.83(b) of this subchapter. stand with unloading connections at- (c) In addition to the provisions of tached after unloading is completed. paragraph (d) of this section, cyanides Throughout the entire period of un- or cyanide mixtures may not be loaded loading, and while car is connected to or stored with acids. unloading device, the car must be at- (d) Hazardous materials may not be tended by the unloader. loaded, transported, or stored together, (j) If necessary to discontinue un- except as provided in this section, and loading a tank car for any reason, all in accordance with the following table:

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