§ 15.01.630. Deflection testing flexible sewer and storm drain lines.

A.

"Go/No-Go" mandrel proof testing. Not less than thirty days after installation of the flexible sewer or drain pipe, the contractor shall test the buried pipe to insure that ring-deflection of the pipe does not exceed five percent of the pipe's specified minimum inside diameter (ID). This proof test shall establish that the contractor has installed the flexible pipe in full compliance with the project specifications thereby providing required pipe/soil structural strength.

The contractor, with inspector present, shall pull a "Go/No-Go" mandrel, inspected and approved by the engineer, through the full length of installed flexible pipe. The mandrel shall be fabricated from suitable metal with a minimum of nine properly sized radial fins mounted upon a center pulling shaft. In any case, the mandrel shall be provided with an odd number of rigidly mounted radial fins. The mandrel shall be provided with a proof-sizing ring that can demonstrate that the mandrel's minimum outside diameter (OD) is not less than ninety-five percent of the actual minimum inside diameter of the installed flexible pipe. The mandrel shall be pulled by the contractor through one hundred percent of the installed flexible pipe without using mechanical equipment. Failure of the mandrel to pass through a pipeline shall be deemed evidence of inadequate installation by the contractor not in compliance with the project specifications.

The engineer may require, if deemed appropriate or necessary, additional proof testing of designated lengths of the buried flexible pipe approximately one year after installation but prior to the expiration of the contractor's maintenance bond. The flexible pipeline shall be cleaned adequately prior to performing the "Go/No-Go" mandrel ring deflection proof test. The contractor, with inspector present, shall pull a mandrel, approved by the engineer, through the designated length of pipeline without using mechanical equipment. Failure of the mandrel to pass through the pipeline shall be deemed evidence of inadequate installation by the contractor not in compliance with the project specifications. If pipeline deflection exceeds five percent during proof testing, the pipeline shall be removed and replaced at the contractor's expense.

(Ord. No. 2007-07-31, §§ 6.12, 6.12.1, 7-10-2007; Ord. No. 2010-11-24, § 2, 11-23-2010)