Water Closet Pipe Size

The listed fixture unit values represent their load on the cold water building supply.

Water closet pipe size.

Closet bend 4 3 closet bend connects to 3 inch schedule 40 pipe. The minimum size of a fixture supply pipe shall be as shown in table 604 5. Toilet water supply line 1 2 inch copper pipe or plastic pipe routed from main water line or 1 2 inch cold water line. A reduced size flexible water connector installed between the supply pipe and the fixture shall be of an approved type.

Appliances appurtenances and fixtures not referenced in the table below shall be permitted to be sized by reference to fixtures having a similar flow rate and frequency of use. This pipe fitting is set under the toilet in the floor joists or ground in toilets on concrete slabs. The closet bend actually has two diameters because it connects the 3 inch drain pipe to the 4 inch drain line. The top of the closet bend is 3 inch diameter pipe while the other end is 4 inch.

The closet bend installs below the toilet and connects to the main drain stack. One end in most cases the inlet is 4 inches wide this mounts to the toilet and the outlet end is 3 inches in diameter. A reducing closet bend configuration or a 4 3 closet bend has two different sized ends to connect two different sized pipes. The supply pipe shall extend to the floor or wall adjacent to the fixture.

Water supply fixture units wsfu and minimum fixture branch pipe sizes. Most toilet installation parts are made to fit these pipe sizes. 304 8mm 1 gallon m 3 785l m. So pipe area should be at least equal to water flow rate divided by eight.

Water velocity should not be greater than 2 438m s at valve seat to prevent noise and erosion. The fixture supply pipe shall terminate not more than 30 inches 762 mm from the point of connection to the fixture.