1991-01-14 Regular Meeting - Laserfiche WebLink

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• In addition to the above structural requirements, satisfactory evidence shall be provided by the Contractor to the City's Authorized Representative that the proposed lining material will incorporate a polyester resin that is suitable for chemical resistance. e. Physical Strength: The CIPP shall conform to the minimum structural standards, as listed below. Pipe Size Flexural Stress #101 (Modified ASTM D-790) 4,500 psi Flexural Modulus #101 (Modified ASTM D-790) 250,000 psi 8" thru 12" of Elasticity 500,000 psi 15" and greater (Values shown are for polyester resins commonly used in the United States. Values for non-typical polyester, vinyl ester and epoxy resins may be substituted when applicable.) f. Deviations: The Contractor shall submit his price proposal for the appropriate length, size and thickness designated in the proposal section. The deterioration of sewers is an ongoing process. Should pre-inversion inspections reveal the sewers to be in substantially different conditions than those in the design consideration, the Contractor shall request appropriate changes in the CIPP thickness, supporting such request with design data based upon the structural design parameters contained in the latest edition of the Insituform Engineering Design Guide or the design guide of an approved equal process. The deviation, if approved, shall be reflected by the appropriate increase or reduction in the unit cost for that size as agreed to by the Authorized City Representative. g. Pre-Installation Procedures: The following installation procedures shall be adhered to unless otherwise approved by the Owner's Representative. Safety -The Contractor shall carry out his operations in strict accordance with all applicable OSHA standards. Particular attention is drawn to those safety requirements involving work on an elevated platform and entry into a confined space or the use of steam. Pre-inversion Cleaning - It shall be the responsibility of the Contractor to remove all loose debris which is located within the sewer pipe. Pre-inversion Inspection -Inspection of sewer pipe shall be performed by experienced personnel trained in locating breaks, obstacles and service connections by closed circuit television inspection. The interior of the pike shall be carefully inspected to determine the location of any conditions which may prevent proper installation of the CIPP, and it shall be noted so that these conditions can be corrected. A videotape and suitable log shall be kept for later reference by the City and/or Contractor. Bypassing Sewage -When required for acceptable completion of an. inversion process task, the Contractor shall provide for sewage flow maintenance around the section or sections of pipe designated for the inversion process. The bypass shall be made by plugging the line at an existing upstream manhole and pumping the flow into a downstream manhole or adjacent system. The pump and bypass lines shall be of adequate capacity and size to handle the flow.