AASHTO Designation: T 249-03 (2007) pdf free download

1.1.This method of test is to be followed in ascertaining the quality of the seam of a helical lock seam corrugated pipe.

VISUAL METHOD

PROCEDURE

2.1.Determine lock seam quality by examining samples of the lock seam cross section sawed from the pipe. See Figure I for location of sample.

See Figure 2 for the cross section of the sample.

2.2.The manufacturer will saw a triangular sample from the seam at one end of a length of pipe so as to show the cross section normal to the seam.

The base of the triangular sample shall be of sufficient width to show complete lock seam profile. (See Figure 1.)

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