The minimum radius for the first 90° fitting downstream from a trap serving a lavatory or sink shall be 1-3/4″ for drain piping 1-1/2″ in diameter. The fitting shall be a tee or quarter bend.

Can you put a 90 in a sink drain?

It’s fine to have a larger-radius (sweep) 90-degree bend at the base of a vertical drainage stack where the wastewater starts to travel horizontally. It’s also a good idea to have a sweep 90-degree fitting where a drain pipe pops out of a wall for a kitchen, vanity or laundry sink.

What is the minimum pipe size for a kitchen sink?

So the drain line is usually 1 1/2 inches in diameter. This size drain line is sufficient for kitchen use. A bathroom sink drain line is typically 1 1/4 inches, slightly smaller. Some kitchen sinks experiencing very light use may use this size drain, but it is not recommended.

What size is plumbing under sink?

1 1/2 inches

Drain Line Pipes

This pipe is usually 1 1/2 inches in diameter. However, many homes have 2-inch drainage pipes. If this is the case, you need a reducing bushing to connect the pipes together. A 1 1/2 inch to 2 inch reducing bushing is the right choice here.

What is the minimum size drain?

The minimum size for a floor drain is 2 inches in diameter. It can be larger, but no smaller. The minimum size is intended to make sure that even running at full capacity, the pipe that the drain leads to will never be more than half full.

Can you put a 90 on AP trap?

6.3 says this would not be allowed: (c) the trap arm does not have a cumulative change in direction of more than 135°. 90+90 = 180°, so that’s too much.

What is the minimum slope for a 3 PVC?

704.1 Slope of Horizontal Drainage Piping

SIZE (inches) MINIMUM SLOPE (inch per foot)
21/2 or less 1/4a
3 to 6 1/8a
8 or larger 1/16a

What size is main drain line?

4 inches

Depending on your local plumbing codes, the main sewer line for residential homes is usually 4 inches in diameter. You may think if the pipe were larger, more waste could travel without getting clogged.

What size are sink supply lines?

The two most common are 3/8- and 1/2-inch compression or male pipe thread. Faucets connectors aren’t completely standardized, but most have 1/2-inch male pipe thread connectors.

What is standard drain pipe size?

1 1/2 inch

There is a pipe size. Most modern drains have a 1 1/2 inch outlet, but older sinks may have drains that connect to a 1 1/2 inch tailpiece. All the pipes that connect to the tailpiece are either 1 1/2 or 1 1/2 inches in diameter.

What is the minimum size for a shower drain?


Keep in mind that shower drain assemblies are generally made to fit a 2-inch drainpipe, not the 1 1/2-inch pipe usually found on tubs. A 2-inch pipe is the recommended size because showers have a low threshold for flooding, and a 2-inch pipe helps the water drain faster than does a 1 1/2-inch pipe.

How do you size the drainage systems?

The sizing of drainage piping systems is based on fixture unit values. The fixture unit value takes into consideration the average rate of discharge, duration of use for a single operation and the interval between each operation of a plumbing fixture.

How do you measure a drain pipe?

Below grade drain pipes shall be not less than 11/2 inches (38 mm) in diameter. Drain stacks shall be not smaller than the largest horizontal branch connected.

P3005. 4.1 Branch and Stack Sizing.

2b 6 10
21/2b 12 20
3 20 48
4 160 240

What size is a bathroom sink drain pipe?

The standard size for a bathroom sink drain pipe is 1.25 inches in diameter. However, this is determined based on your state’s housing code, and you may find that they suggest 1.5 inches or 1.65 inches in diameter, and your home has been built with this plumbing standard.

What size is a bathroom sink waste pipe?

Basin wastes and traps are 32mm and the pipework should be the same, no harm if you used a 40 to 32mm reducer to take the pipe up a size……..but no need…

How do you calculate catch basin size?

Quote from Youtube video: Step 1 calculate the runoff draining to the location of the basin. Step 2 find the table for the catch basin you want to install.

What is a Type 1 catch basin?

A Type 1 catch basin is a rectangular box with approximate dimensions of 3’x2’x5′. Type 1 catch basins are utilized when the connected conveyance pipes are less than 18 inches in diameter and the depth from the gate to the bottom of the pipe is less than 5 feet.

What is a Type 3 catch basin?

Type 3 Catch Basin ODOT 2′-0″ x 2′-0″ Overview. Underground precast drainage inlets and catch basins are among the most widely used drainage products in the market today to collect excess storm water runoff from roofs, sidewalks, parking lots, and paved streets. Top Sections. Frames and Grates.

How many DFU is 2 inch drain?

710.1 Maximum Fixture Unit Load

Total for horizontal branch Total for stack greater than three branch intervals
11/2 3 8
2 6 24
21/2 12 42

What does DFU stand for in plumbing?