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MEASURING PIPES The measurement for a length of pipe required for installation includes the amount of pipe engagement and the dimension of the fitting. This learning event describes engagement, fitting dimensions, and pipe length. The last section of this learning event explains how to use these three factors to determine the amount of pipe required for installation. Engagement Engagement for castiron soil pipe (singlehub). Different sizes of pipes require different amounts of engagement. A pipe engagement occurs when the spigot end of one pipe fits into the hub end of another pipe. A fitting engagement occurs when the end of a fitting fits into the hub end of a pipe. Always measure the distance inside the hub for a true pipe or fitting engagement.
Engagement for rigid plastic pipe (ABS and PVC). Different sizes of pipes require different amounts of engagement. Engagement occurs when the end of a pipe fits into the collar of a fitting. Always measure the distance inside the collar for a true fitting engagement.
Engagement for galvanized steel pipe. Different sizes of pipe require different amounts of engagement. Engagement occurs when the threaded end of a pipe fits into the collar of a fitting. Always measure the distance inside the collar for a true fitting engagement.
Engagement for rigid copper tubing (DWV). Different sizes of tubing require different amounts of engagement. Engagement occurs when the end of the tubing fits into the collar of a fitting. Always measure the distance inside the collar for a true fitting engagement.
Fitting Dimension The fitting dimension is also needed when determining the amount of pipe required for an installation. The fitting dimensions for all types of waste fittings are determined the same way. A fitting dimension is the distance from the center of the fitting to the end of the fitting.
Measurement of Pipe Lengths Endtoend measurement.
Endtocenter measurement.
Centertocenter measurement.
Determination of Amount of Pipe Required for Installation Pipetopipe. To figure the length of pipe required when using singlehub castiron pipe, use the following steps. The example given in italics is from the illustration below.
Pipetofitting. The method for figuring the length of pipe required for a pipetofitting connection is the same for all types of piping. Use the following steps. The example given in italics is from the illustration below.
Centertocenter. The method for figuring the length of pipe required for a connection between fittings is the same for all types of piping. Use the following steps. The example given in italics is from the illustration below.

David L. Heiserman, Editor  Copyright © SweetHaven
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Revised: June 06, 2015