A New Steel Tubing with Valuable Properties O F considerable interest
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to the commercial-vehicle industry is a new introduction to this country named Bundy tubing. Similar in appearance to tubing made by ordinary processes, the Bundy product is manufactured by rolling steel strip, about its length, to form a double-walled tube and welding
the joints. A special process is, of course, employed and the finished tube has walls of consistently uniform thickness, a clean coppered interior and a corrosion-resisting external surface.
Easily workable, Bundy tube is claimed claimed to possess high strength and
resistance to fatigue. The ultimate bursting pressures in the case of the i-in. and -166-in. (outside diameter) tubes are, respectively, 12,500 lb. per sq, in. and 10,500 lb. per sq. in. The strip material is low-carbon steel having a yield point of 28,000-36,000 lb. per sq. in.
Automobile applications of Bundy tubing include fuel and lubricant pipe lines, hydraulic systems (braking, tipping, etc.), vacuum and air-pressure piping and, possibly, fuel-injection Systems. The development of Bun.dy tubing for the last named, however, is not yet completed, but already encouraging results have been obtained.
Standard tubes of the two sizes named 'above, have, respectively, internal diameters of 0.194 in. and 0.2565 in., and wall thicknesses in both cases of 0.029 in. The maker is the British Bundy Tubing Co., Ltd., Thames House, IVfillbank, London, 5.W.1, which concern has works at Letchworth, and the distributor in England to the automobile industry is the A,C.-Sphinx Sparking Plug. Co., Ltd., Durtstable.