10.26.2021-SBN-Standards-Manufacturer-Additions-Minor-Revisions-final

Home Browse Search

SECTION 4 – SANITARY 45 3.) Structural Requirements: Each CIPP shall be designed to withstand continuous internal and/or external loads as dictated by the site and pipe conditions for a minimum fifty (50) year service life. Design of the liner shall take into account the condition of the existing pipe and shall assume no bonding to the original pipe wall. Video inspection reports and videos, when available, can be reviewdat the office of the Engineer. Forty-eight (48) hour notice shall be given to the Engineer, prior to video inspection review. The design thickness of the CIPP shall be arrived at using standard engineering methodology as found in ASTM F1216, Appendix X1, Fully Deteriorated Gravity Pipe Condition. A minimum groundwater depth of five (5) feet above the invert shall be used in the design of the CIPP. The long-term modulus shall not exceed fifty percent (50%) of the short-term value for the resin system and shall be verifiable through testing. A safety factor of at least two (2) shall be used. The design calculations, signed and sealed by a Professional Engineer Registered in the State of Indiana, shall be submitted to the City Engineer prior to fabrication of the tube. The layers of the finished CIPP shall be uniformly bonded. It shall not be possible to separate any two (2) layers with a probe or point of a knife blade so that the layers separate cleanly or such that the knife blade moves freely between the layers. If separation of the layers occurs during testing of the field samples, new samples will be cut from the work. Any reoccurrence of failure may be cause for rejection of the work. 4.) Liner Tube: The tube shall consist of materials meeting the requirements of ASTM F1216 or ASTM F1743 and shall be capable of carrying resin, withstanding installation pressures, and curing temperatures. The tube should be compatible with the resin system. The material should be able to stretch to fit irregular pipe sections and negotiate bends. Projected changes in groundwater level, temperature, and other loading factors shall cause no significant changes in the service characteristics or service life of the CIPP. The liner shall be fabricated from materials which when cured, will be chemically resistant to reagents in domestic, commercial, and industrial sewage as specified in ASTM F1216, ASTM F1743, and ASTM D543. The tube should be fabricated under controlled conditions to a size that, when installed, will tightly fit the internal circumference and the length of the original conduit. Allowances should be made for the longitudinal and circumferential stretching that occurs during placement of the tube. Maximum stretching allowances shall be as defined in ASTM F1216 or ASTM F1743. The Contractor shall verify the lengths in the field before cutting the liner to length. The tube shall be uniform in thickness and when subjected to the installation pressures shall meet or exceed the designed wall thickness. Any plastic film applied to the tube on what will become the interior wall of the finished CIPP shall be compatible with the resin system used, translucent enough that the resin is clearly visible, and shall be firmly bonded to the felt material. At the time of manufacture, each lot of liner shall be inspected and certified to be free of defects. The tube shall be marked for distance at regular intervals along its entire length, not to exceed five (5) feet. Such markings shall also include the Manufacturer’s name or identifying symbol.