Copyright Goodheart-Willcox Co., Inc. 336 Section 3 Plumbing System Design and Installation Apply and Analyze 1. The size of drain/waste pipe is determined by the _____. Critical Thinking 1. If the face-to-face distance between a 1/2″ copper elbow and a 1/2″ copper tee is 6 1/2″, the length of the connecting copper pipe will be _____. A. 6 1/2″ B. 7″ C. 7 1/4″ D. 7 1/2″ 2. If the face-to-face distance between a 3/4″ galvanized iron tee and a 3/4″ elbow is 18″, what length of 3/4″ galvanized iron pipe will be required to properly connect the two fittings? A. 19″ B. 19 1/8″ C. 19 1/4″ D. 20″ Suggested Activities 1. Working as a group, make a set of sample pipe assemblies with each of the different types of pipe commonly used in your area. Each of these completed exercises should be capped and fitted with adapters or test plugs so they can be tested using standard procedures. 2. Refer to a set of plans for a single-family home and prepare a schematic drawing for the DWV piping system. Refer to local code or IRC to determine the d.f.u. associated with each fixture. Select the correct size pipe for each section of the piping system. Label the fittings A, B, C, etc. Prepare a list of fittings required for the installation including the dimensions of each fitting.