Measuring Culvert Pipes - Plastic & Metal
We’ve created a simple and informative document that provides clear, practical instructions for accurately measuring culvert pipes made from plastic (HDPE) and metal. It explains the difference between the spigot (male) and bell (female) ends of HDPE pipes, emphasizing that measurements should be taken from the spigot end only, using the center of the pipe both vertically and horizontally for accuracy. For metal pipes, which are uniform at both ends, the same center measurement method is recommended. The guide includes examples, notes about potential distortion from stacking, and lists common pipe sizes, making it a helpful reference for contractors, suppliers, and anyone working with drainage or culvert systems.
Measuring Culvert Pipes - Plastic & Metal
Purpose:
To explain how to accurately measure HDPE (plastic) and metal corrugated culvert pipes.
HDPE (Plastic) Corrugated Pipe:
Ends:
Spigot (Male) – Smaller end
Bell (Female) – Larger end (not used for sizing)
How to Measure:
Measure inside to inside at the spigot end only
Measure at the center of the pipe, both vertically and horizontally
Pipes may appear misshapen—center measurement gives the best accuracy
Example:
17 5/8″ x 18 3/8″ = 18″ pipe
Common Sizes:
10″, 12″, 15″, 18″, 24″, 30″, 36″
Metal Corrugated Pipe:
Ends:
Same on both sides—measure from either end
How to Measure:
Like plastic pipe, measure the center vertically and horizontally
Usually true to size unless bent or damaged
Common Sizes:
12″, 15″, 18″, 24″, 30″, 36″, 42″, 48″, 54″, 60″, 66″, 72″