Schedule 40 steel pipe is the most-used pipe schedule. It can be galvanised, but it's not necessary. It's often used for gas and water lines. It can also be found in places that need to be decorated or held up.

Because of how flexible it is and how well it works, it makes a great pipe. Let's talk about what schedule 40 steel pipe is and why, now that it's under so much pressure to work, it might be the right choice for many projects.

What is a pipeline schedule, and how does it work?
A pipe schedule (SCH) is a way to measure how thick the average wall of a steel pipe is.

Before, people who made things out of metal used three different sizes of pipe: standard, extra strong, and double extra strong. But it wasn't enough to just have these three vague dimensions. There are now 14 different types of schedules for steel pipes.

Schedule 40 is the one that is used the most.

What does it mean when someone talks about "schedule 40 pipes"?
No one knows how big the numbers on the pipes are. So, SCH 40 does not mean that the diameter of the pipe is 40 millimetres or 40 inches.

The characteristics of each schedule are set by the ASME B36.10M standard, which governs the sizes of both seamless and welded steel pipes. ASME B36.10M says how each size is represented by a number.
Schedule 40 Steel Pipe Grades
Most schedule 40 steel pipe is made out of mild steel. This means it has between 0.2 and 0.25 percent carbon in it. This is very low, so the resulting alloy is mostly iron.

Galvanizing SCH 40 steel pipe makes it more resistant to corrosion. Galvanizing means putting a layer of zinc on the steel. If this isn't an option, you can also get schedule 40 pipe made of stainless steel.

Even though most people think of SCH 40 steel pipe when they hear the term "A53 steel pipe," this schedule is also available in other grades.

Schedule 40 steel pipe dimensions
The thickness is based on the wall thickness and the outer diameter. For example, the outer diameter of a 1/8-inch nominal size schedule 40 pipe is 0.405 inches and the wall thickness is 0.068 inches. The weight per square foot is 0.245 pounds.

The pipe that is used most often is the 4-inch schedule 40 steel pipe. This pipe has an outside diameter of 4.5 inches and a wall thickness of 0.237 inches. It weighs 10.79 pounds per foot.