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Southern Human Services Center Smith Sinnett /2020072 <br />HVAC and Roof Renovations Orange County,North Carolina <br />Hydronic Piping 23 21 13 - 6 <br />c.SURFACTANT 4 ounces product:Tritan DF-16 or equivalent low-foaming <br />surfactant <br />5.After initial 12 hours of flushing,screens and strainers shall be pulled,checked,and cleaned. <br />Flushing shall then continue for another 12 hours.At the end of 24 hours,if strainers are still <br />showing debris,continue flushing for 6 additional hours.System shall be flushed for a <br />minimum of 24 hours and up to 30 hours as required. <br />6.After completion of cleaning solution flushing,the system shall be completely drained to <br />sanitary sewer.Flush with clean water.If the system cannot be drained completely,put a <br />bleed on system and add clean water until system test at a pH of 6.8 to 7.4. <br />7.Remove all temporary materials and bypass piping. <br />8.Apply corrosion control chemicals with 2-3 days of flushing and cleaning procedure.Submit <br />reports confirming concentration. <br />9.Retesting and flushing <br />a.Any changes made to the piping systems after testing and/or flushing shall require <br />retesting and flushing of the affected portions of the system.If any portion of the piping <br />system is exposed to dirt or debris after the flush,it shall be re-flushed. <br />10.Contractor Certification <br />a.Provide a letter to the Engineer and Owner certifying the tests and flushes were <br />performed in accordance with the specifications,what the final results were,and what <br />the intermediate results were.The contractor's representative shall sign and date.A <br />copy shall be placed in the O&Ms. <br />11.The Engineer or Owner/CxA shall review the test and flushr results prior to opening a new <br />portion of piping to a previously approved portion or an existing system.If the supporting <br />documentation is not reviewed by the Engineer prior to opening,the entire system shall be <br />flushed again. <br />3.04 INSTALLATION <br />A.Install in accordance with manufacturer's instructions. <br />B.Route piping in orderly manner,parallel to building structure,and maintain gradient. <br />C.Install piping to conserve building space and to avoid interference with use of space. <br />D.Group piping whenever practical at common elevations. <br />E.Sleeve pipe passing through partitions,walls,and floors. <br />F.Unless otherwise indicated,horizontal piping may be installed level or with a pitch up at 1"per 40' <br />in direction of flow.Install manual air vents at all high points where air may collect.If vent is not in <br />accessible location,extend air vent to nearest code acceptable drain location with vent valve <br />located at nearest accessible location to pipe.Terminate vent valve within two feet above ceiling in <br />accessible location. <br />G.Main branches and runouts to terminal equipment shall be made at top (first choice)or top 45 <br />degree (second choice),with drain valves suitably located for complete system drainage and <br />manual air vents located as per above. <br />H.Bottom connections to piping are not allowed under any circumstances,unless specifically <br />approved by the Engineer on a case by case basis.If permitted by the Engineer,a line size Y- <br />strainer with shutoff valve and blowdown valve shall be installed at branch connection. <br />I.Mitered elbows,welded branch connections,notched tees,and "orange peel"reducers are not <br />allowed.Unless specifically indicated,reducing flanges and reducing bushing are not allowed. <br />Reducing bushings may be used for air vents and instrumentation connections. <br />J.Contractor shall provide all manual air vents and drains (air vents at high points,drains at low <br />points)in order to allow for appropriate air venting and to permit complete drainage of the entire <br />system. <br />K.Cut threads so that no more than 3 threads remain exposed after joint is made.Apply thread <br />sealants to cleaned male ends.Assemble joint to appropriate depth and remove any excess pipe <br />joint compound from tightened joint. <br />L.Install valves,control valves,and piping specialties,including items furnished by others,as <br />specified and/or detailed. <br />DocuSign Envelope ID: 94E7997D-4F29-42F6-A9B4-0A160438D2A6