Specifications - City of Montpelier, Vermont

Title:Montpelier District Heating15540 – HVAC PumpsCity of Montpelier, VTIssue Date:September 28, 2012Page #:4 of 9B. Casings Construction: Cast iron, with threaded companion flanges for pipingconnections smaller than 2½", and threaded gage tappings at inlet and outletconnections.C. Impeller Construction: Statically and dynamically balanced, closed, overhungsinglesuction, fabricated from cast bronze conforming to ASTM B 584, andkeyed to shaft.D. Pump Shaft and Sleeve: Steel shaft, with copper sleeve. Provide slinger on motorshaft between motor and seals to prevent liquid that leaks past pump seals fromentering the motor bearings.E. Mechanical Seals: Carbon steel rotating ring, stainless steel spring, ceramic seat,and flexible bellows and gasket.F. Pump Shaft Bearings: Oillubricated, bronze journal and thrust bearings.G. Pump Couplings: Flexible, capable of absorbing torsional vibration and shaftmisalignment.H. Motors: Resiliently mounted to the pump casing.I. Manufacturers: Subject to compliance with requirements, provide one of thefollowing:1. "Series 1000," Armstrong Pumps, Inc.2. "Series 60," Bell & Gossett, ITT.3. "1600 Series," Taco, Inc.2.3 BASEMOUNTED, CLOSECOUPLED, ENDSUCTION PUMPSA. General Description: Pumps shall be basemounted, centrifugal, closecoupled,endsuction, singlestage, bronzefitted, radially split case design, and rated for175 psig working pressure and 225°F continuous water temperature.B. Casings Construction: Cast iron, with flanged piping connections, and threadedgage tappings at inlet and outlet flange connections.C. Impeller Construction: Statically and dynamically balanced, closed, overhung,single suction, fabricated from cast bronze conforming to ASTM B 584, keyed toshaft and secured by a locking cap screw.HVAC PUMPS155404