Specifications - City of Montpelier, Vermont

Title:Montpelier District Heating15510 – Hydronic PipingCity of Montpelier, VTIssue Date:September 28, 2012Page #:11 of 14D. Install drain valves at low points in mains, risers, branch lines, and elsewhere asrequired for system drainage.3.6 HYDRONIC SPECIALTIES INSTALLATIONA. Install air vents at high points in the system, heat transfer coils, and elsewhere asrequired for system air venting.B. Install pump discharge valves with stem in upward position; allow clearanceabove stem for check mechanism removal.C. Install compression tanks above air separator. Install tank fitting in tank bottomand charge tank. Use manual vent for initial fill to establish proper water level intank.D. Install diaphragm type expansion tanks as indicated. Vent and purge air fromhydronic system, charge tank with proper air charge to suit system designrequirements. Use pipe size as recommended by the tank manufacturer.E. Install balancing valves per the manufacturer’s written instructions and thefollowing criteria:1. A minimum of 5 pipe diameters upstream and 2 pipe diametersdownstream of the balancing valve to a pipe fitting or another valve.2. A minimum of 10 pipe diameters upstream of the valve to a pump and aminimum of 5 pipe diameters downstream of the valve to a pipe fitting oranother valve when the balancing valve is downstream to a pump.F. Install Chemical Shot Feeders (Filter Feeders) per manufacturer’srecommendation.3.7 FIELD QUALITY CONTROLA. Preparation for testing: Prepare hydronic piping in accordance with ASMEB31.9 and as follows:1. Leave joints including welds uninsulated and exposed for examinationduring the test.2. Provide temporary restraints for expansion joints that cannot sustain theHYDRONIC PIPING 15510 11