Galvanized water pipe is required to be what schedule?

Galvanized water pipe is typically required to be Schedule 40. This specification indicates the pipe's wall thickness and pressure rating, making it suitable for a wide range of water supply applications. Schedule 40 galvanized pipe is commonly used because it offers a good balance of strength and flexibility, which is important for ensuring the integrity of the plumbing system under various conditions.

Schedule 20, being thinner-walled, is generally not recommended for water supply at high pressures, and would not provide sufficient durability for most plumbing systems. Schedule 80, while thicker and appropriate for certain high-pressure applications, is usually not necessary for standard water distribution in residential settings, where Schedule 40 provides adequate strength without excessive weight or cost.