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According to UPC drainage tables, a 1-1/2 inch vertical stack may carry up to 6 DFUs. Exceeding this requires upsizing to a 2-inch stack. Correct answer: C. 6 DFUs.

The UPC requires a 2-inch trap and standpipe for clothes washers due to the high discharge rate from pumps. Smaller traps cannot handle the surge load and would risk overflow. Correct answer: C. 2 inches.

At 90 feet, UPC gas tables show that a 1-1/4 inch pipe delivers ~285,000 BTU/hr, which is insufficient. A 1-1/2 inch pipe can supply ~465,000 BTU/hr, making it the correct choice. A 2-inch pipe would be oversized unless expansion is expected. Correct answer: B. 1-1/2 inch.

UPC drainage tables establish slope requirements to maintain scouring velocity and prevent buildup. For any pipe 2-1/2 inches or smaller, the required slope is 1/4 inch per foot. This ensures solids are carried with the liquid flow, reducing blockages. Larger pipe diameters (4 inches and above) may use a 1/8 inch per foot slope. By applying this rule, plumbers maintain both functionality and code compliance. Correct answer: C. 1/4 inch per foot.

According to UPC drainage tables, a 6-inch horizontal branch can carry up to 400 DFUs at standard slope. Beyond this capacity, upsizing is required. Correct DFU management ensures safe and efficient operation of large building systems. Correct answer: C. 400 DFUs.