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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 />20 314" D <br />Silver <br />21 314" D <br />Blue <br />22 118" D <br />Red <br />22 114" D <br />Yellow <br />23" D <br />Green <br />23 518" D <br />Black <br />25 112" D <br />Fluorescent Orange <br />26" D <br />Orange <br />26 1/2" D <br />Gold <br />Ver. 13 --- 6101115 <br />