4.1 Operational experience and independent testing have fully documented that the usable life, maintenance and failure and mean time between failures (MTBF) in buried storm and wastewater lines can be directly affected by the defects during manufacturing, incorrect pipe storage, and improper installation, including improper compaction often resulting in the deformation and physical damage in newly installed, repaired and replaced pipelines. Laser profiling assessment is an effective quality control tool for identifying and quantifying deformation, physical damage, and other pipe anomalies after installation, providing valuable means and methods for determining the quality of workmanship and compliance with project specifications. Laser profiling capabilities include:
4.1.1 Measurement of the structural shape, cross sectional area and defects;
4.1.2 Collection of data needed for better pipe rehabilitation or replacement design; and
4.1.3 Post rehabilitation, replacement or new construction workmanship verification.
4.2 This standard practice provides minimum requirements on means and methods for laser profiling to meet the needs of engineers, contractors, owners, regulatory agencies and financing institutions.
4.3 A laser profile pre-acceptance and condition assessment survey shall provide significant information in a clear and concise manner, including but not limited to graphs and still frame digital images of pipe condition prior to acceptance, thereby providing objective data on the installed quality and percentage ovality, or degree of deformation, deflection or deviation, that is often not possible from an inspection by either a mandrel or only CCTV.
4.4 This practice applies to gravity flow lines—storm sewers, sanitary sewers, combined sewers, siphons, edge drains, highway drains, and culverts, and to all other pipelines, ducts and conduits that are made accessible and meet the requirements of 1.3, regardless of shape, design configuration or material. The line shall be free of excess debris and obstructions with a maximum flow level or stagnant water, during laser profiling, not to exceed 108201;% of nominal pipe diameter or 6 in. (150 mm) in depth, whichever is the lesser.
1.1 This practice covers the procedure for the post installation verification and acceptance of buried pipe deformation using a visible rotating laser light diode(s), a pipeline and conduit inspection analog or digital CCTV camera system and image processing software. The combination CCTV pipe inspection system, with cable distance counter or onboard distance encoder, rotating laser light diode(s) and ovality measurement software shall be used to perform a pipe measurement and ovality confirmation survey, of new or existing pipelines and conduits as directed by the responsible contracting authority.
1.2 This practice applies to all types of material, all types of construction, or shape.
1.3 This practice appl......
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