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UPC Section 804 states that a clothes washer standpipe must be at least 18 inches long but no more than 36 inches. This range ensures the washer pump discharges correctly while preventing overflow or siphonage. Proper standpipe design ensures code compliance and system reliability. Correct answer: D. 36 inches.

The UPC requires a minimum 1-1/4 inch vent for small fixtures like drinking fountains. This ensures proper venting while balancing installation economy. Correct answer: B. 1-1/4 inch.

At 30 feet, a 3/4-inch pipe can carry ~114,000 BTU/hr, which is sufficient for the combined 100,000 BTU/hr load. A 1/2-inch pipe is inadequate, while 1 inch or larger would be oversized. Correct pipe sizing reduces cost while ensuring safe and efficient appliance operation. Correct answer: B. 3/4 inch.

UPC gas piping tables show that at 100 feet, a 1-inch pipe can carry only ~151,000 BTU/hr, which is insufficient. A 1-1/4 inch pipe can deliver ~285,000 BTU/hr, meeting the demand. Oversizing to 1-1/2 inch is not necessary unless additional loads are expected. Proper sizing ensures appliance efficiency, safety, and compliance. Correct answer: C. 1-1/4 inch.

At 100 feet, a 1-1/2 inch line delivers ~465,000 BTU/hr, which is inadequate. A 2-inch pipe delivers ~850,000 BTU/hr, making it sufficient for 500,000 BTU/hr. Proper sizing ensures safe operation and efficiency. Correct answer: C. 2 inches.