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Standard Specifications for <br />The Insituform® Process <br />1. n l• These specificationscover the Insituform rehabilitation process for existing <br />sewer lines, and storm drains. <br />The InsitutuWU is inserted into existing pipe lines in an uncured condition and thereafter <br />cured using equipment and processes specifically designed to form a tight fitting, semi- <br />rigid pipe -within -a -pipe. When curing has been accomplished, lateral connections are <br />reestablished from within the newly formed cured -in-place Insitupipim. <br />Conduits rehabilitated by the Insituform process shall be video inspected before lining' <br />and after completed installation and reestablishment of laterals, if any. The video <br />inspection record shall be made available at no charge to the client for review and final <br />acceptance of the project. <br />2 >Prenaration: Conduit to be rehabilitated shall be cleaned of all loose extraneous matter <br />which may interfere with the rehabilitation process. Protruding laterals which may <br />interfere with the rehabilitation shall be removed by the client. <br />3. Materials: Materials used shall be composites consisting of a fiber felt tube system, a <br />resin system and a catalyst system. <br />a. Fiber Felt Tube Sylkm-: The felt tube shall be a thermoplastic polyester or <br />acrylic needlefelt of five denier minimum with sufficient needling and <br />crosslapping to yield an adequate burst strength in the transverse direction (hoop <br />stress). The layer exposed to the effluent shall have polyurethane or poly -vinyl <br />chloride bonded to it., normally 0.01 inch thickness' and shall be pinhole free (12 <br />oz./sq. yd). <br />b. Resin Sy erns• The resin shall be thermosetting polyester resin. The resin shall <br />have sufficient thixotropic properties to have nondraining characteristics when <br />impregnated into the felt tube and during the curing process. <br />C. CataIng System: The catalyst system shall be compatible with the resin. The <br />resin shall be catalyzed by the addition of sufficient catalyst to produce the <br />Physical properties in subsection below. <br />4. Wet Out of Felt Tube: : The contractor shall designate a location where the felt tube will <br />be vacuum impregnated prior to installation. The contractor shall allow the client to <br />inspect the material and wet out procedure. <br />-1- <br />9/92 <br />