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Flanged pipe with screwed - on flanges shall be furnished with long hubs , and the flanges shall be screwed on the threaded end of the pipe in the shop , and the face of the flange and end of pipe refaced together . There shall be no leakage through the pipe threads and the flanges shall be designed to prevent corrosion of the threads from outside . The back of the hub shall be caulked where the hub threads joint with the pipe . 5 . Valve Box Adjustments : Cost of valve nut extenders shall be included in cost of valve box adjustments where needed . E . Disinfecting Potable Water Pipelines Before being placed in service , all potable water pipelines shall be chlorinated in accordance with the latest edition of AWWA C - 651 , Standard Procedure for Disinfecting Water Mains " , except that the use of tablets is strictly prohibited . The procedure shall be approved by the Engineer . The location of the chlorination and sampling points will be as specified by the Florida Department of Environmental Protection , Water Distribution System Permit . Taps for chlorination and sampling shall be uncovered and backfilled by the Contractor , as required . F . Aerial Crossing Painting Requirements 1 . The Contractor shall furnish all labor , materials , equipment and incidentals required to paint all components as herein specified . 2 . The Work includes the painting and finishing of all exposed exterior surfaces . 3 . The term " paint " as used herein means all coating system materials , which includes pretreatment , primers , emulsions , enamels , sealers and fillers , and other applied materials whether used as prime , intermediate or finish coats . 4 . Flanged exposed piping shall have a paintable sealant placed between the back of the flange and the threaded pipe end connection . The back of the flange shall be prepared prior to the application of the sealant . 5 . Provide finish coats , which are compatible with the prime paints used . Contractor shall be responsible for the compatibility of all shop primed and field painted items . Furnish information on the characteristics of the finish materials proposed for use to ensure that compatible prime coats are used . Provide barrier coats over incompatible primers or remove and reprime as required . Notify the Engineer in writing of anticipated problems using the coating systems as specified with substrates primed by others . 6 . Surface Preparation : a . Clean ferrous surfaces that have not been shop - coated of all oil , grease , dirt , loose mill scale and other foreign substances by near white blast cleaning , complying with SSPC - SP 10 . 5 . Treat bare and blasted or pickled clean metal with metal treatment wash coat , prior to priming only if recommended by the paint manufacturer . TECHNICAL PROVISIONS TP - 13 .. FAPublic Works\Capital Projects\Oslo Road Lateral J\BID DOCUMENTS\DIVISION 2 - Technical Provisions . doc