Chapter 6 Mathematics for Plumbers 113 Copyright Goodheart-Willcox Co., Inc. Critical Thinking 1. Compute the volume of a rectangular tank that measures 8′ long by 4′ wide by 10′ tall. How many gallons of water will this tank hold if it is filled to a depth of 6′? 2. Convert these US customary measurements to metric: A. 18 inches B. 453 cubic feet C. 4 feet 3. There are many piping material options available for use in plumbing installations: PVC, galvanized metal, PEX tubing, copper. What type of piping would you choose for your own home? Why? What are the advantages and disadvantages of the material you chose? 4. You may have heard the expression, “Measure twice, cut once.” What do you think this phrase means to a plumber? Is it a rule to follow or faulty advice to avoid? Why? Suggested Activities 1. Practice measuring the length of various pieces of pipe using both the US customary and the metric scale. 2. Calculate the actual length of pipe required for a variety of typical installations. Include fitting allowances. 3. Compute the volume of a standard tank for water heating or other plumbing installations.