Document gb3X6BJjV7DvKNOQEjRxbYjZN

670 CHAPTER 26 1957 Guide /- of manufacture. Note that the joint factor, c, is not included for plain end non-ferrous pipe as listed in Table 2. In addition to IPS copper pipe, several varieties of copper tubing are in use with either flared or compression couplings or soldered joints; Dimen sions of copper water[tubing intended for plumbing^ underground water service, fuel-oil lines, gas lines, etc., have been standardized by the U. S. Government and the. American Society for Testing Materials. Nominal Size* 54 H 54 a 54 1 IK IK 254 354 6 S 10 12 14 16 18 20. .. Table 4. Threading Data fob Pipe Pipe 0. D. . Standabd Weight Extra, and Double Extra Stbons Threads, per Inch0 Coupling O. D. Coupling Length Thbeads peb Inch Coupling O. D. Coupling Length 0.405 0.540 : ' 0.675 0.840 1.050 27 18 18 14 14 1.315 1.660 1.990 2.375 2.875 UK UK 11H liK 8 3.500 4.000 4.500 5.563 6.625 8 8 8 8 8 8.625 10.750 12.750 14.000 16^000 -' 18.000 20.000 - 0.563 0.719 0.875 1.063 1.313 1.576 1.900 2.200 2.750 3.250 4.000 4.625 5.000 6.296 7.390 -- 1M 1K lMe 154 2 2H 2Ke 254 354 . ZH zH 354 ZH 4 - --. 27 18 18 14 14 im 11V? 1154 1154 8 8 8 8 8 8 8 8 8 8 8 0.563 0.719 0.875 1.063 1.313 1.576 2.054 2.200 2.875 3.375 4.000 4.625 5.200 6.296 7.390 9.625 11.750 14.000 . 15.000 17.000 19.000 21.000. IHs 1H IK 2K 2H 254 2M 2H 2K 4H 454 4H 4K 4H 4K 554 554 654 654 654 754 754 * All dimensions in inches. b Taper of threads is K ul per ft on diameter on all sizes of pipe, and in couplings of 2K in. and overCouplings 2 in. and smaller are straight tapped. . N.5o.6te62: Tfohrecwopapllethr iacnkndersesdabnrdasinsspidipeed. iameter shown in.Table 1 do not apply,to copper and red brass pipe- Copper tube is classified in accordance with the wall thickness as follows: Type K--Heavy Wall.: : Type L--Medium Wall. TypeM--Light Wall. Type DWV--Light Wall- -for drainage, waste, and vent service. In general, Type K is used for underground services and for general plumbing service where corrosion conditions are severe. Type L is used for general plumbing, and heating service where: conditions may be con sidered normal. Type M is used for sanitary drainage and other non pressure applications, for heating, and sometimes, for other services less severe than those for which Types K or L are recommended. Type DWV is of lighter weight than Type M, and is used for sanitary drainage and Pipe, Fittings, Welding 671 other non-pressure applications. Type DWV tube should not be used underground. Type L is suitable for underground drainage applications. Unless adequately protected, no copper tube should be embedded in a cinder fill. Where flexibility is essential as in hidden replacement work, or where as few joints as possible are desired as in fuel-oil lines, the soft temper is commonly used. In new or exposed work copper tube of a hard temper is generally used. All three types are extensively used with soldered fittings. Standard dimensions, weights, and diameter and wall-thickness toler ances for these classes of copper tube are obtainable from Table 2. Copper pipe is also available with dimensions of steel pipe. In refrigeration lines, used in connection with air conditioning equip ment, copper tube is used extensively. For refrigeration use where tube absolutely free from scale and dirt is required, bright annealed copper tube that has been cleaned, dehydrated and sealed is used. This tube is available in a variety of sizes and wall thicknesses. Table 5. Nobmal Engagement of Tight-Fit Male and Female Pipe Thbeads For American Standard and API Pipe Threads Pipe Size Engaged . Length* In. Pipe Sizes Engaged Length* In. Pipe Sizes Engaged Length* In. 54 y* m Ma 4 IK 54 H IK 5i 5 IK 54 H 2 54 6 IKe 54 K 2K 8 1Ms 54 K* 3 l 10 1H 1 >5f 3K lHo 12 IK * Dimension shown is the normal tight-6t thread engagement from the leading edge of the female thread b&ck to the leading edge of the mala thread. No allowance has been made for threading variations. THREADING PRACTICE In all threaded pipe for heating and ventilating installations the American Standard taper pipe thread, ASA B2.1-1945 is used. This thread is cut with a taper of 1 in 16 measured on the diameter of the pipe so as to secure a tight joint. The number of threads per inch varies with the pipe size. Threads for fittings are the same, except that it is regular practice to furnish, straight tapped couplings for Schedule 40 pipe 2 in. and smaller. Forsteam pressures in excess of 25 psi, it is recommended that taper-tapped couplings be used to obtain a tight joint. These may be secured by order ing Une pipe4 which is used for oil piping, the couplings of which axe provided with taper-tapped threads and may be used with regular mill-threaded standard weight, pipe. Thread lengths should be in accordance with n-; , 2-I. Right-hand threads are used unless otherwise ordered, to facilitate drainage, some elbows have the thread tapped at an angle to Provide a pitch of the connecting pipe of 3^ in. to the foot. These elbows are Known to the trade as pitch elbows and are commercially available. All threaded pipe joints should be made up with a thread paste suitable for the service for which the pipe is to be used. Table 4 contains pertinent threading data for standard weight, extra strong and double extra strong steel, and wrought-iron pipe. The-normal engagement of pipe threads is given in Table 5.