Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT33615 – Hot Water Pipe Distribution SystemIssue Date:September 25, 2012Page #:7 of 18vi.HDPE Jacket shall be coronatreated during production to ensureoptimum adhesion between HDPE jacket and insulation3. Insulation – Homogenous hard polyurethane foam (PUR) made from polyoland isocyanate in according to EN 253, meeting or exceeding the followingmaterial properties:i. Average Cell Size: max 0.02 in (0.5 mm)ii. Density: 3.75 lbs/ft 3 (60 kg/m 3 )iii. % Closed Cells: > 88%iv.Water Absorption if Boiled: < 10% (Vol.)v. Compressive Strength at 10% Deformation: 43.5 psi (0.3 N/mm 2 )vi. Axial Shear Strength: 17.4 psi (0.12 N/mm 2 )vii. Tangential Shear Strength: 29.0 psi (0.20 N/mm 2 )viii. Thermal Conductivity at 122 o F (50 o C): 2.65x10 4 BTU/(min·ft ·oF)(0.0275 W/mK)ix.Max. Continuous Operating Temperature: 284 o F (140 o C) for 30 years4. Alarm Wires – Preinsulated steel district heating pipes shall be constructedwith two copper wires embedded within the insulation for leak detectionmeeting the following material propertiesi. Wires: Two (2) 1.5 mm 2 noninsulated copper wires (one tinned)ii.iii.Distance to Steel Pipe: min. 0.55 in (15 mm)Position from Top of Pipe: 1 – 7.5 in (3 – 20 cm) from 12 o’clockposition (one on each side of the pipe)5. Fittings and Valves – All fittings (elbows, bends, tees, etc.) and valveassemblies shall be preinsulated with the same means, methods, and materialsas the preinsulated steel pipe and shall comply with EN 448.6. Joint Kits – Joint kits shall comply with EN 489 and shall be powertransmitting.7. Warrantyi. The manufacturer shall warranty all materials from defects in theGoods due to the manufacture, shipping, or delivery of the Goods for aminimum of five years after the accepted delivery to the Owner.ii.All direct, indirect, and consequential costs of correcting, removing,and replacing defective Goods during the warranty period, including,HOT WATER PIPE DISTRIBUTION SYSTEM336157