Main Water Supply Line Size

This rule may be subject to change if you are replacing an existing water main.

Main water supply line size.

Bigger is better if you want lots of water in a short time. Then make short runs of one half inch pex water line tubing to each fixture. There are three main factors that determine the correct water supply line size which is also referred to as the water service line. The three factors are as follows.

Water line size determines the amount of water flowing from a pipe. The water line size is vital to providing adequate volume of water to the occupants of a building. If you are installing a new domestic water line smaller than 3 nyc plumbing code reads that the tap must be one size smaller than the size of the pipe. The tables below can be used to size building supply and branch lines and meter and service lines.

The branch lines which are the ones that feed individual fixtures are 1 2. But they actually simplify plumbing runs and reduce possible leaks by eliminating the need for tees and other fittings between the main supply line and the fixture. With the water supply fixture units system defined by the uniform plumbing code upc there are tables available where the total demand calculated by adding each units water supply fixture units wfsu are compensated to an expected demand. Size water line videos below.

The main pipes which are the ones that come off the main water supply and the water heater are 3 4 inches in diameter. If you are installing a 1 water main you can connect to the existing tap. Find out how in this video. For adequate water flow it s a good idea to install 1 2 inch or 3 4 inch pex for your main lines.

Standard sink supply line size the copper galvanized steel or pex pipes that constitute a residential water supply system are of two main diameters. 8 inch diameter water main supplies. A calculation using all of the plumbing fixtures in a. 1 inch pipe less than 100 feet to a house is good.

Size water line tips.