Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT15250 – Mechanical InsulationIssue Date:September 28, 2012Page #:12 of 13C. Maintain integrity of vapor barrier on equipment insulation and protect it toprevent puncture and other damage.D. Do not apply insulation to equipment and breechings/stacks while hot.E. Apply insulation using the staggered joint method for both single and double layerconstruction, where feasible. Apply each layer of insulation separately.F. Coat insulated surfaces with layer of insulating cement, troweled in workmanlikemanner, leaving a smooth continuous surface. Fill in scored block, seams,chipped edges and depressions, and cover over wire netting and joints withcement of sufficient thickness to remove surface irregularities.G. Cover fiberglass insulated surfaces with allservice jacketing neatly fitted andfirmly secured. Lap seams at least 2". Apply over vapor barrier whereapplicable.H. Do not insulate boiler manholes, handholes, cleanouts, ASME stamp, andmanufacturer's nameplate. Provide neatly beveled edge at interruptions ofinsulation.I. Provide removable insulation sections to cover parts of equipment that must beopened periodically for maintenance including metal vessel covers, fasteners,flanges, frames and accessories.3.9 EXISTING INSULATION REPAIRA. Repair damaged sections of existing mechanical insulation, both previouslydamaged or damaged during this construction period. Use insulation of samethickness as existing insulation, install new jacket lapping and sealed overexisting.3.10 PROTECTION AND REPLACEMENTA. Replace damaged insulation that cannot be repaired satisfactorily, including unitswith vapor barrier damage and moisture saturated units.B. Protection: Insulation Installer shall advise Contractor of required protection forinsulation work during remainder of construction period, to avoid damage anddeterioration.3.11 WEATHERPROOF COVERSMECHANICAL INSULATION 15250 12