Sink Drain Pipe Size Code

All the pipes that connect to the tailpiece including the p trap assembly.

Sink drain pipe size code.

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. Tables of plumbing drain pipe vent pipe sizes critical distances to plumbing fixtures. For instance the minimum pipe diameter for a washing machine drain is pipe with a 1 1 2 inch diameter. You ll see these distances also in our sketch at left.

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. The horizontal pipes connect to the trap with a double wye tee which has two y shaped inlets and one outlet. Horizontal drain pipes connecting the sink drains to the trap must have a minimum slope of 1 4 inch per foot toward the trap. To be safe install more supports than are required.

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. A single trap can service more than one sink but adjacent drains cannot be farther apart than 30 inches. This pipe size is commonly used for sanitary drainage. Bathroom vanity with cooper sink.