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b. Adjustable turnbuckle must be pivoted on 304 stainless steel roll pins at both ends <br />which eliminates binding of mechanism when expanding or contracting manhole <br />riser. <br />c. The linkage assembly shall not contain tac-welds. <br />d. The linkage shall pivot inside a solid W thick bar. The linkage shall accommodate <br />an adjustment to the diameter of the ring of 1/2" in either direction (larger or smaller). <br />e. The ring must be a single piece assembly, with no loose parts. <br />f. Riser must expand to obtain full circumferential engagement. <br />g. The riser shall not obstruct entrance to a manhole. There are no extensions to <br />hinder men or equipment using the manhole. <br />h. All moving parts and mating surfaces are zinc plated with dichromate finish or <br />stainless steel. Skirts are G90 galvanized. <br />i. Skirt must be welded 85% of the circumference of riser. <br />j. Manhole riser allows efficient application of the pivoted turnbuckle so that 60 lbs. <br />force applied 7" from center of turnbuckle exerts 5600# tangential force in the riser <br />ring. This enables the riser ring to be forced to fit worn out of round manhole lid <br />seats and still exert a great force on the side walls for holding power. <br />k. Manhole risers shall be color coded prior to delivery based on the following: <br />Ring Diameter <br />Color <br />20 3/4" D <br />Silver <br />21 3/4" D <br />Blue <br />22 1/8" D <br />Red <br />22 1 /4" D <br />Yellow <br />23" D <br />Green <br />23 5/8" D <br />Black <br />25 1/2" D <br />Fluorescent Orange <br />26" D <br />Orange <br />26 1/2" D <br />Gold <br />XIX. DIVISION F: TRAFFIC MATERIALS <br />B. Prevailing specifications/INDOT Standard Specification Section: 808, 909, 921 <br />C. Additions: <br />1. Liquid Thermoplastic Traffic Marking paint: <br />a. Liquid Thermoplastic Traffic Marking Paint must meet and exceed the chemical <br />composition and performance requirements of Federal Specification TT-P-1952E. <br />b. Liquid Thermoplastic Traffic Marking Paint must be environmentally friendly 100% <br />acrylic emulsion traffic paint containing less than 100 grams per liter volatile organic <br />content (VOC). <br />Version 1/30/2020 Special Provisions - 11 <br />