Sink Drain Pipe Size Code

Compare the fixture to the minimum sizes of drainage pipe by fixture table.

Sink drain pipe size code.

The horizontal pipes connect to the trap with a double wye tee which has two y shaped inlets and one outlet. Bathroom vanity with cooper sink. Horizontal drain pipes connecting the sink drains to the trap must have a minimum slope of 1 4 inch per foot toward the trap. All the pipes that connect to the tailpiece including the p trap assembly.

Some older sinks may have drains that connect to a 1 1 4 inch tailpiece but most modern drains have a 1 1 2 inch outlet. According to most codes copper supply pipe must be supported every 6 feet galvanized or black steel pipe every 12 feet pvc or abs drainpipe every 4 feet and cast iron pipe every 5 feet. Below our tables 1 and 2 summarize common plumbing code specifications for fixture venting and vent pipe sizes and distances that a plumbing fixture can be located horizontally from the vent stack. This pipe size is commonly used for sanitary drainage.

Tables of plumbing drain pipe vent pipe sizes critical distances to plumbing fixtures. The last size is 4 inch drain pipe that can be connected to 160 units in horizontal stack and 240 units in vertical stack. To be safe install more supports than are required. A single trap can service more than one sink but adjacent drains cannot be farther apart than 30 inches.