Based on plumbing codes, the size of a kitchen sink drain depends on the number of compartments.
According to Section P-506 Sizes of Fixture Traps and Fixture Drains, the minimum size for a kitchen sink drain in a residence varies:
- 1 1/2 inches for single or double compartment kitchen sinks.
- 2 inches for 3-compartment kitchen sinks.
This size refers to the minimum required diameter for the fixture drain pipe and the associated trap (often the P-trap) that connects the sink drain opening to the main drainage system.
Here's a breakdown based on the provided reference:
| Fixture | Minimum Size of Trap & Fixture Drain (Inches) |
|---|---|
| Sink, Kitchen, Residence, single or double compartment | 1 1/2 |
| Sink, Kitchen, Residence, 3 compartments | 2 |
Understanding the correct drain size is crucial for proper drainage and preventing clogs. Using a drain pipe that is too small can lead to slow drainage and potential blockages, as it may not be able to handle the volume of water and debris typically associated with kitchen sink use.
