Nitrogen tube trailers

Mixtures of 10 and 20% fluorine ia nitrogen or other inert gases are commercially available ia cylinders and tube trailers from Air Products and Chemicals, Inc. Blends can be safely packaged and stored at high, eg, 13.8 MPa (2000 psi), pressure. Filled with a 20% fluorine blend, tube trailers can contain up to 500 kg of fluorine. Such high pressure mixtures permit larger quantities of fluorine to be safely shipped. 

Liquid nitrogen gas is transported in liquid cylinders, nonpressurized Dewars, cryogenic tankers, and trailers. Gaseous nitrogen is a transported in high-pressure gas cylinders and tube trailers. Both forms of nitrogen also are transported via pipelines when the sources are at economical locations and distances from the applications. 

Nitrogen trifluoride gas is shipped as a compressed gas in steel cylinders and can also be provided by tube trailer. Metals suitable for use in NF3 systems at ambient temperatures are stainless steel, steel, brass, aluminium, copper, and nickel. Corrosion rates of less than 0.0025 mm/a at about 70°C have been measured for these materials [1,2]. However, the corrosion rate increases significantly in the presence of moisture or HF [2]. Fluorinated polymers such as Teflon, Kel-F, and Viton are not attacked by NF3 at ambient [1,2] and elevated temperatures [3]. These materials are recommended for flexible lines and fittings [1]. At elevated temperatures, where the reactivity is similar to that of fluorine, nickel and Monel are recommended as suitable materials for handling NF3 [1]. 

Gaseous nitrogen is commonly stored in high pressure cylinders, tubes, or tube trailers. Liquid nitrogen is commonly stored at the consumer site in cryogenic liquid cylinders and specially designed vacuum-insulated storage tanks. 

Nitrogen gas is authorized for shipment in cylinders, tube tank cars, and tube trailers. Liquid nitrogen is shipped as a cryogenic fluid in vacuum-insulated cylinders, and in insulated portable tanks, tank trucks, and tank cars. 

Gaseous nitrogen is shipped in tube trailers with capacities ranging to more than 40 000 fl (1133 m ). These trailers are built to comply with TC/DOT cylinder specifications 3A, 3AA, 3AX, 3AAX, or 3T. The trailers commonly serve as the storage supply for the user with the supplier replacing trailers as they are emptied. 

Nitrogen trifiuoride is authorized for bulk highway shipment at high pressure (usually around 1450 psig or 10 000 kPa) in tube trailers. These trailers are made up of a number of large tubes, usually constructed to specification 3 AX or 3 A AX, which are manifolded together to a common header. Approved pressure relief devices and valves must be installed on each tube, and valves must be closed during transit. 

By Highway In cylinders on trucks, and in tube trailers. Liquid nitrogen, in vacuum-insulated cylinders and cargo tanks. 

Nitrogen trifluoride is authorized for shipment as a nonflammable compressed gas in cylinders, including DOT/TC approved trailer tubes. Nitrogen trifluoride is normally compressed to 1450 psig (10 000 kPa) in cylinders. 

---