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Cement-Asbestos Pipe

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wedging action of the tapered thread may cause the fittings to split. Usually there are two or three unused threads on a pipe that is threaded properly. If you follow the above steps and the threads are made properly, the joints will be tight for pressures several times the 150-psi working pressure of the fittings. Cement-Asbestos Pipe Cement-asbestos  pipe  is  corrosion-resistant  and does not rust or rot. It has a smooth interior surface that is a favorable friction factor. This pipe comes in sizes from 3 to 36 inches in diameter for pressures of 50 to 200 psi and in lengths of 5, 10, and 13 feet. Light in weight, cement-asbestos pipe is easy to handle. It is made with beveled ends, and adapters are available for connecting to pipe made of other materials. FITTINGS. —In  the  absence  of  cement-asbestos fittings, you can use double-bell, cast-iron fittings and make them up as you would with cast-iron pipe, using sulfur compounds or lead. CUTTING.—Cement-asbestos pipe can be cut to any length or angle with a carpenter’s saw or a transite pipe cutter. Or, it can be tapped for threaded service connections  by  using  a  water  main  self-tapping machine. With this machine, the pipe can be tapped, threaded, and a corporation stop installed while the pipe is under water pressure. Because of the health and environmental hazards associated  with  cement-asbestos  pipe,  special  cutting and handling kits have been procured by the Navy and Figure 3-62.—Pipe- and bolt-threading machine. are  available  through  the  naval  supply  system. Whenever  cement-asbestos  pipe  is  encountered,  the base or unit environmental officer should be contacted. Also, the newest and most up-to-date instructions should  be  obtained  and  followed.  Since  safety procedures governing asbestos-related equipment change,  an  attempt  to  outline  all  the  pertinent procedures for working with asbestos are not included in this manual; however, there are two important factors you should keep in mind. First, always wear a breathing filter or mask. Second, use water while cutting to keep the dust from becoming airborne, or use a vacuum to pull dust from the area of the cutting tool. JOINING.—Joints in cement-asbestos pipe are made with a special coupling with three rubber sealing rings. Three rings are fixed in grooves at the factory, ready for assembly. Figure 3-63 shows a cutaway view of a completed joint with the three rings in proper position. As each pipe moves into position during assembly, the rubber Figure 3-63.—Cutaway view of a cement-asbestos pipe joint. 3-49



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