Revision of C76-22a Standard Specification for Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe
Rationale
Rationale:
The ACPA brought forward a comment with regards to the required measurement of the pipe dimeter defined on ASTM C76 section 12.1. The current verbiage requiring 4 diametric measurements of pipe is confusing to producer members and the clarification shown below is recommended. Please note that the practice of 4 dimetric measurements in pipe is common and accurate. The goal of this effort is an attempt to clarify the requirement by adding that the measurements are to be taken two measurements on each side.
Ballott language:
12. Permissible Variations
12.1 Internal Diameter—The internal diameter of 12-in.
through 24-in. pipe shall not vary by more than 2 % of the
design diameter for 12-in. pipe and 1.5 % for 24-in. pipe with
intermediate sizes variation being a linear scale between 2 %
and 1.5 %. The internal diameter of sizes 27-in. and larger shall
not vary by more than 1 % of the design diameter or 63/8
-in., whichever is greater. These diameter requirements are based on
the average of four diameter measurements
(two measurements at each end of the pipe) at a distance of 12
in. from the end of the bell or and spigot of the pipe. Diameter
veri?cation shall be made on the number of pipe selected for
test per Section 11.
Work Item Status
Date Initiated: 03-31-2025
Technical Contact: John Kallemeyn