: Mainline: Lined Main Tap™: Installation Specs
Back to Key FeaturesInstallation Specifications for Mainline Liner Connection Lined Main Tap™ (LMT™)
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INTENT
It is the intent of this specification to provide a cost effective installation of a sewer lateral tap to a rehabilitated mainline pipe providing a VNLC™ (verifiable non-leaking connection).
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GENERAL
The LINE MAIN TAP™ (LMT™) product and process consists of locating the service connection within the mainline pipe by the most effective means available to the installer. The most common method utilized and associated with the LMT™ process consists of inserting a video camera with an internal sonde either through the lateral service and pushing the camera to the mainline pipe or from main pipe to the service location. Locating the service location is achieved with a receiving unit and marked on the surface. Once the service connection has been located an access pit is made by conventional excavation exposing the main pipe at the lateral connection. Then, a 2-foot section of the original host pipe is broken away, exposing the new stand-alone mainline liner. (Pipe within a pipe, CIPP/Folded Pipe) Prepare the surface of the mainline liner by removing any excess resin or debris to provide a smooth clean surface. Grinding may be necessary. The opening in the mainline liner may be circular or elliptical to accommodate a WYE or TEE shaped LMT™ saddle. The LMT™ is connected to a new section of PVC pipe (4" or 6" SDR 26 or SDR 35) utilizing a solvent weld or a push gasket joint. An adhesive/sealant is applied to the underside of the LMT™ saddle. The LMT™/PVC pipe assembly is snapped onto the exterior of the mainline liner. The LMT™ saddle is attached to the mainline liner encompassing more than fifty percent (50%) of the mainline liner diameter. The LMT™ saddle is a self-supporting component, which allows the resin to cure without affecting the integrity of the seal to the mainline liner. Then the section of new PVC pipe is connected to the existing lateral pipe using a non-shear leak-free coupling. The excavated access pit is back filled and the site is restored according to the engineers specifications. The process shall be LMT™ (LINED MAIN TAP™) by LMK® Technologies or equal.
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MATERIAL
The material shall be a molded PVC saddle sized to encompass more than 50% of the mainline liner. The saddle boss shall be either solvent welded or a push-gasket bell. The adhesive/sealant shall be designed for structurally adhering to CIPP, PVC, Modified PVC or PE pipe.
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FINAL ACCEPTANCE
Upon completion, the installer will deliver an internal CCTV video of the main/lateral connection to the owner. The owners will review the documentation and the site to determine that the scope of work is complete and the work is satisfactory.