In Korea, where Dunkinâ Donuts opened its first stores recently, it is finding a new audience: Korean customers have swooned over oversized French Cruller munchkins, split in half and filled with Bavarian cream.
Single random pipe has an average length of 20 feet. Any given joint will be somewhere between 17.5 and 22.5 feet. Double random is 40 feet on average with any given joint being between 37.5 and 42.5 feet.
Everything needs to have the required slope. The required slope depends on the size of the pipe. IPC table 704.1 shows that a pipe with an ID (interior diameter) of 2.5 or less needs 1/4 per foot. While a pipe that is 3 to 6 only needs 1/8 per foot.