Document ymgkyw58yMkLeVOBdO3MgDpGD

KEATING VENTILATING AIR CONDITIONING GUIDE 1942 Fusion welding, commonly used in erection of piping, is defined as the process of joining metal parts in the molten, or molten and vapor states, without the application of mechanical pressure or blows. Fusion welding embraces gas welding and electric arc welding, both of which are com monly used to produce acceptable welds. Welding application requires the same basic knowledge of design as do the other types of assembly, but in addition, requires a generous know ledge of the sciences involved, particularly as to welding qualities of Table 10. American Standard Dimensions for Butt-Welding Elbows, Tees, Caps, and Lapped-Joint Stub Ends, A.S.A. B16.9-1940 CHAPTER 18. PIPE. FITTINGS, WELDING ability nor on the basis of past experience. Neither does industry accept the statement that a weld is only as good as the workman who makes it. The control Codes now in process of adoption will be the law governing the use of the welding process. These Codes prohibit individual practices contrary to their specified procedure and rules of control, and this is Table 11. American Standard Dimensions of Steel Welding Neck Flanges for Steam Service Pressure Rating of 150 Lb per Sq In. (Gage) at a Temperature of 500 F, and 100 Lb. per Sq. In. (Gage) at 750 F, A.S.A. B16e-1939 Nounai. Pipe Size OUTSIDB Diametbb i miK 2 m 3 3K 4 5 6 8 10 12 1.315 1.660 1.900 2.375 2.875 3.500 4.000 4.500 5.563 6.625 8.625 10.750 12.750 Centeb-to-Ens 90-Deg ElbowB A m IK 2K 3 3M 4K 5K 6 7K 9 12 15 18 45-Deg Elbows B % i ImmK 2 2K 2K 3K 3M 5 6K 7K Of Run Tee C* IK IK 2K 2K 3 3K 3H 4K 4K 5K 7 8K 10 Caps b-e IK IK IK IK IK 2 2K 2K 3 3K 4 5 6 Lapped-Joint Stub Ends Length 4 4 4 6 6 6 6 6 8 8 8 10 10 Radius of Fillet R K He K He He % K Ks He K K K K Diam. of ftp ' 2 2K 2K 3K 4K 5 5K 6He 7Ko 8K 10K 12K 15 AU dimensions given in inches. The dimensions of welding tees cover those which have side outlets from one size less than half the size of the run-way opening of the tees to full size. bDimensions ami F are applicable only to these fittings in schedules up to and including Schedule 80, A.S.A. Standard B36.10-1939. cThe shape of these caps shall be ellipsoidal and shall conform to the requirements of the AS.M.E. Boiler Construction Code. dThis dimension is for standard machined facings in accordance with American Standard for Steel Pipe Flanges and Flanged Fittings (A.S.A. B16e-1939). The back face of the lap shall be machined to conform to the surface of the flange on which it seats. Where ring joint facings are to be applied, use dimension K as given in A.S.A. B16e-1939. metal, their reaction to extremely high temperatures, and the ability to determine and use only the best quality welding rods. This requirement applies equally to employer and employee with the employer accepting all of the responsibility. Thus the employer should select his welding mechanics with good judgment, provide them with first-class equipment and tools, arrange for their training and use of acceptable workmanship standards, and at regular intervals subject their work to prescribed tests. Industry will not accept the employment of mechanics of undetermined 356 A*AU rdaimiseednsfaiocnesogfivHeintoin. isinicnhcelus.ded in thickness offlange minimum and in length through hub. t>The outside surface of the welding end of the hub shall be straight or tapered at not more than 6 deg. ^Dimensions B and J correspond to the outside and inside diameters of pipe as given in A .S.A. B36.10- 1939,TShcehseedduialem4eQt.ers are identical with the diameters of what was formerly designated as Standard Weight Pipe of the corresponding sizes. predicated upon the sound requirement that the employer must assume fulIltreisspaodnvissiabbililteytfhoartththeisdempaonsaitgeedmweenldt .responsibility, be included in all welding specifications and that authoritative standards of workmanship'/ -i-- i--The standards of workmanship for this industry are as