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When a building has over 50 fixture units, the UPC requires upsizing to at least 2 inches for the building water service. This ensures sufficient pressure and flow during simultaneous fixture use. Correct answer: D. 2 inches.

The UPC establishes maximum trap arm distances to maintain trap seals. For a 2-inch trap arm, the maximum allowable length before vent connection is 5 feet. Since this arm is 4 feet, it is within the limit. If longer than 5 feet, it would risk siphonage and trap seal failure. This requirement ensures sanitary conditions and prevents sewer gas intrusion. Correct answer: B. Yes, maximum is 5 feet.

At 150 feet, a 2-1/2 inch pipe carries ~730,000 BTU/hr, which is insufficient. A 3-inch pipe, delivering ~1,150,000 BTU/hr, is required to serve 1,000,000 BTU/hr safely. Correct answer: C. 3 inches.

The UPC requires that vent pipes increase in size before passing through the roof to prevent frost closure in cold climates. If a vent pipe is more than 40 feet in developed length, it must be increased one nominal pipe size, with a minimum of 3 inches at the roof penetration. This requirement prevents ice blockage, which could disable the vent system and cause trap seal failures. Therefore, the correct answer is C. Increase to 3 inches.

At 70 feet, a 1-inch pipe can carry ~198,000 BTU/hr, which is insufficient. A 1-1/4 inch pipe can carry ~300,000 BTU/hr, meeting the 250,000 BTU/hr demand. This ensures safe and efficient operation. Correct answer: C. 1-1/4 inch.