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As mentioned, yes, it would be correct to state you need a casing pipe with a larger inside diameter than the largest outside diameter of the pipeline running through the casing pipe. That said, you need to take a closer look at the carrier pipe as well as any accessory items needed in order to determine what the largest outside diameter will be for the specific pipeline, then you can confidently select a casing pipe with a sufficient inside diameter to accommodate for the carrier pipe or pipes.
I mention pipe or pipes as it is possible to have more than one pipeline or conduit running through a single casing pipe, which will be illustrated later. For our example, we will be looking at 24-inch diameter Ductile iron pipe (DI pipe) as the carrier pipe throughout this blog.
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Each size (diameter) of DI pipe will have the same outside diameter tolerances for the pipe barrel, regardless of the wall thickness being used. What will vary by size is the outside diameter of the specific bell, or joint type, being used.
The OD of the pipe's bell will always be greater than the OD of the barrel of the pipe. This variance is why it is essential to know the OD of the bell of the specific pipe joint being used. (Tyton Joint, TR Flex, Mechanical Joint, etc.)
This information is easily obtained by:
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