Orange County NC Website
Browse       Search
OC Sportsplex Pool HVAC Unit Replacement <br />PDC Project 23022 HVAC Water Treatment 23 25 00 - 3 <br />B.Aqua-Chem <br />C.Aqualine <br />D.ChemTreat <br />E.GE Water &Process Technologies​​ <br />F.Water Guard <br />G.Nalco Company​​ <br />H.Or Approved Equal <br />2.02 MATERIALS <br />A.System Cleaner: <br />1.Liquid alkaline compound with emulsifying agents and detergents to remove grease and <br />petroleum products;sodiumtripoly phosphate and sodium molybdate. <br />2.Biocide chlorine release agents such as sodium hypochlorite or calcium hypochlorite or <br />microbiocides such as quarternary ammonia compounds,tributyltin oxide,methylene bis <br />(thiocyanate). <br />B.Closed System Treatment (Water): <br />1.Sequestering agent to reduce deposits and adjust pH​​. <br />2.Corrosion inhibitors;boron-nitrite,sodium nitrite and borax,sodium totyltriazole,low <br />molecular weight polymers,phosphonates,sodium molybdate,or sulphites. <br />3.Conductivity enhancers;phosphates or phosphonates. <br />2.03 CORROSION COUPON RACK: <br />A.Acceptable Manufacturers: <br />1.Cannon Water Technology <br />2.J.L.Wingert <br />3.Advantage Controls <br />4.Novatech <br />B.Supply for each corresponding shot feeder: <br />1.Chilled water:3/4”stainless steel coupon rack,with two coupon holders,inlet/outlet 316 <br />stainless steel full port ball valves,and a 1/4”sample valve. Include a 0-5 gpm nominal range <br />variable area flow meter (“rotameter”),rated 150 psig at 70°F,with graduated polysulfone or <br />acrylic cylinder,with an accuracy of +/-5%. Provide mild steel and copper coupons. <br />2.Heating hot water and dual temperature systems:3/4”stainless steel coupon rack,with two <br />coupon holders,inlet/outlet 316 stainless steel full port ball valves,and a 1/4”sample valve. <br />Include a 0-5 gpm nominal range variable area flow meter(“rotameter”),rated 100 psig at <br />250°F,graduated glass cylinder with stainless steel or brass connections,with an accuracy of <br />+/-2%. Provide mild steel and copper coupons. <br />PART 3 EXECUTION <br />3.01 PREPARATION <br />A.Perform an analysis of the supply water to determine the type and quantities of chemical treatment <br />needed to maintain the required water quality to prevent corrosion,scaling,and biological <br />growth. At minimum,provide weekly site visits to verify proper water treatment for the first month <br />after any system or part of a system is treated. Provide monthly visits thereafter,or more often if <br />required to assure performance requirements are being met,to analyze water samples,inspect <br />equipment,and add additional chemicals as required to maintain proper water treatment,until final <br />written Owner acceptance of the respective system. <br />B.Pre-Treatment Conference:Prior to treatment activities,meet with the Project Engineer, <br />Commissioning Agent and contractors to verify treatment procedures,discuss coordination with <br />existing piping networks,and to coordinate treatment activities with construction schedule. <br />C.At each site visit,analyze each system for corrosion inhibitors,pH,total iron,total copper,bacteria <br />levels (provide monthly analytical laboratory analysis),and conductivity;inspect loss from <br />Docusign Envelope ID: D4F3B98E-0756-4A0C-A3AD-05AA32D39F1C