AWWA C208-17 pdf download.Dimensions for Fabricated Steel Water Pipe Fittings
1.1.1 Conditions not covered in this standard. This standard is intended to serve as a dimensional guide only. It is not a design standard for wall thickness, pressure ratings, structural design, or hydraulic design. Reinforcement of fttings, which may include increased wall thickness, collars, wrapper plates, or crotch plates, is not described in this standard. The design of fttings should be performed . in accordance with the applicable section(s) in AWWA Manual M11, Steel Pipe: A Guide. for Design and Installation.
4.1.1 General. The formulas in this standard provide the flexibility to cal- culate dimensions for fttings of any size pipe based on the outside diameter of the pipe.
Values resulting from the formulas are general minimum dimensions of good practice for fttings with plain ends or beveled ends for field welding. Alterna- tive dimensions may be necessary for other types of joint connections, such as . mechanical couplings, grooved or shouldered couplings, bells, spigots, Aanges, and so on, to maintain adequate distance from a reinforcement collar to the pipe end or to facilitate practical limits of fabrication. Other geometrically constrained ends, such as Aanged ends, may be acceptable when furnished with dimensions shorter than those contained herein, subject to agreement of constructability between the purchaser and manufacturer. See appendix A for a reference listing of select ftting dimensions based on nominal pipe diameters.
4.1.6 Tangential onutlet. The minimum length of a tangential outlet, Lo, is calculated by the formulas below. (Refer to Figure 3.) Lt should be kept as short as possible to avoid damage during shipping and handling but long enough to allow for fange clearance. If necessary to enable the valve operator to clear the outside diameter of the run pipe, a fAanged spool should be used to extend the connection as required.AWWA C208-17 pdf download.