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A DOT-111 tank car, specification 111A100W1, constructed by fusion welding carbon steel.This car has a capacity of 30,110 US gallons (113,979 L; 25,071.8 imp gal), a test pressure of 100 psi (690 kPa), a tare weight of 65,000 pounds (29,500 kg) and a load limit of 198,000 pounds (89,800 kg).
US DOT CFR Title 49, part 178, Subpart C — Specification for Cylinders [31] US DOT Aluminum Tank Alloy 6351-T6 amendment for SCUBA, SCBA, Oxygen Service — Visual Eddy inspection [ 32 ] AS 2896-2011:Medical gas systems—Installation and testing of non-flammable medical gas pipeline systems pipeline systems (Australian Standards).
Diagram showing construction of the DOT 117 tank car. The DOT-117 (TC-117 in Canada) is a type of unpressurized tank car in use on North American railroads. The DOT-117 design was developed in the aftermath of the Lac-Mégantic rail disaster of 2013 in an effort to upgrade the specifications of the then-common DOT-111 and CPC-1232 designs. [1]
While a vehicle that uses DOT 3 may also use DOT 4 or 5.1 (a temperature upgrade) if the elastomers in the system accept the borate compounds that raise the boiling point, [citation needed] a vehicle that requires DOT 4 might boil the brake fluid if a DOT 3 (a temperature downgrade) is used.
If the cylinder is repainted or plastic coated, the temperature must not exceed 300 °C for steel cylinders, [40] or the temperature specified by the manufacturer for aluminium cylinders. [ 19 ] Before fitting the valve the thread type must be checked to ensure that a valve with matching thread specification is fitted. [ 41 ]
Modern tank cars carry all types of liquid and gaseous commodities Rows of tank cars at a railyard in the Midwestern United States [1]. A tank car (International Union of Railways (UIC): tank wagon) or tanker is a type of railroad car (UIC: railway car) or rolling stock designed to transport liquid and gaseous commodities.
The pressure vessel is a seamless cylinder normally made of cold-extruded aluminum or forged steel. [5] Filament wound composite cylinders are used in fire fighting breathing apparatus and oxygen first aid equipment because of their low weight, but are rarely used for diving, due to their high positive buoyancy.
DOT-3AA gas cylinders must be tested every 5 years and have an unlimited life. (Unless stamped with a star (*) in which case the cylinder meets certain specifications and can have a 10-year hydrostatic test life). Typically organizations such as DOT PHMSA, ISO, ASTM and ASME specify the guidelines for the different types of pressure vessels.