Specifications - City of Montpelier, Vermont

Montpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Title:15510 – Hydronic PipingPage #:9 of 14PART 3– EXECUTION3.1 PIPE APPLICATIONSSYSTEM SIZE PIPING AND FITTINGMATERIALSBuilding Heating ≤2" Copper, SteelNOTESolder or coldpress on copper,125 psi threaded fittings on steelBuilding Heating > 2.5” Steel Welded or groovejoint fittingsBuilding Heating –Runouts≤1" PEXMachine expanded only, handexpanded not permittedDistrict Heating Any Steel 250 psi threaded fittings or weldedDomestic Water ≤2" Copper Solder or coldpressMiscellaneous(equipment drains forexample)≤2" Copper Solder or coldpress3.2 PIPING INSTALLATIONSA. General: Refer to Division 15 Section, “BASIC PIPING MATERIALS ANDMETHODS” for general piping installation requirements.B. Make reductions in pipe sizes at pump connections using eccentric reducer fittinginstalled with the level side up.C. Install dielectric waterway fittings or unions to join dissimilar metals, refer toDivision 15 Section, “BASIC PIPING MATERIALS AND METHODS”.D. Install flexible connectors at inlet and discharge to pumps (except inline pumps)and other vibration producing equipment.1. Three flexible type grooved joint couplings may be used in lieu of aflexible connector at equipment connections. Couplings shall be placed inclose proximity to the source of the vibration.E. Use minimum three elbows to form a swing connection for supply and returnrunouts to risers and/or heating equipment.3.3 HANGERS AND SUPPORTSHYDRONIC PIPING 15510 9