"What does schedule pipe mean? schedule 40? schedule 80?"
The pipe schedule refers to the pipe wall thickness. The higher the schedule, the thicker the pipe wall. For example:
• 2-inch nominal size pipe: schedule 40 has a wall thickness of 0.154 inches and schedule 80 has a wall thickness of 0.218 inches.
• 4-inch nominal size pipe: schedule 40 has a wall thickness of 0.237 inches and schedule 80 has a wall thickness of 0.318 inches.
As you can see, the relationship between schedule and wall thickness changes with the pipe nominal size, we always suggest double checking your pipe size & pipe wall thickness to ensure you are getting the proper equipment every time :)
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