Specifications - City of Montpelier, Vermont

Title:Montpelier District Heating15510 – Hydronic PipingCity of Montpelier, VTIssue Date:September 28, 2012Page #:13 of 14Coordinate with Owner for witnessing the test.3.8 ADJUSTING AND CLEANINGA. Clean and flush hydronic piping systems. Remove, clean, and replace strainerscreens. After cleaning and flushing hydronic piping system, but beforebalancing, remove disposable fine mesh strainers in pump suction diffusers.B. Mark calibrated nameplates of pump discharge valves after hydronic systembalancing has been completed, to permanently indicate final balanced position.3.9 INSTALLATION OF WATER TREATMENTA. General: Furnish chemicals recommended by water treatment systemmanufacturer for treating hydronic systems. Provide only chemicals that arecompatible with materials of hydronic systems and equipment. Install watertreatment in accordance with chemical treatment manufacturer’s writteninstruction.B. Chemical treatment products specified herein are products of Vermont BoilerSystems. Provide specified products or products of an approved alternatechemical treatment company.C. Hydronic system:1. Provide chemical treatment analysis and findings report of the existing hotwater system fluid prior to the new construction work of this Project.2. After system has been tested for leaks, and piping systems flushed clean ofall grit, fillings, dope, etc., add cleaner VBS1960 at the recommendedrate and concentration. Heat to 140 to 180 F and circulate for eight hours.Dump product to drain and flush until pH is +/ 0.3 of the raw water.3. After cleaning hydronic system, add passivator VBS1930 and circulate asrecommended by the chemical treatment company.4. After passivating the hydronic system add sufficient corrosion inhibitorVBS1260 to maintain a molybdate level of 4060 ppm or asrecommended by chemical treatment company for glycoled hydronicsystems.HYDRONIC PIPING 15510 13