Revised Specifications - the Public Building Commission of Chicago

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Project Rev E_07/02/10 formation. Maximum ground temperature change over 25 year period shall not exceed 5 degrees F. Parameters shall be based on a detailed computer simulation thermal analysis of the building space conditioning equipment loading of the GHEX. C. Product data for each field component (vaults, piping, valving, fittings, vault sump pump, identification tape, vault fan, grout, etc.). Clearly identify on each cut sheet what model number and accessories are being provided. Cross out all products not included. D. Shop Drawings (Scale 1/8” = 1’-0”): Signed and sealed by a qualified professional engineer licensed in the state of Illinois. 1. Calculate requirements for expansion compensation for underground piping. 2. Calculate pressure drop from the building to the most hydraulically remote location in the field and back at peak design flow rate. Pressure drop shall not exceed 40 feet for field. 3. Piping layout showing expansion compensators, offsets, and loops with appropriate materials to allow piping movement in the required locations. Show anchors and guides that restrain piping movement with calculated loads, and show concrete thrust block dimensions. 4. Show pipe sizes, locations, and elevations. Show piping in trench, with details showing clearances between piping, and insulation thickness. 5. Drawings shall be generated in AutoCAD latest edition. 6. The shop drawings shall include all applicable manufacturers’ specifications, warranties, material cut sheets and material safety data sheets for all materials (pipe, valves, vaults, etc.) used in geothermal installation. E. Coordination Drawings: Show pipe sizes, locations, and elevations. Show other piping in same trench and clearances from distribution piping. Indicate interface and spatial relationship between manholes, piping, and proximate structures. F. Profile Drawings: Show system piping in elevation. Draw profiles at horizontal scale of not less than 1 inch equals 50 feet and at vertical scale of not less than 1 inch equals 5 feet. Indicate manholes and piping. Show types, sizes, materials, and elevations of other utilities crossing distribution piping. G. Record Drawings (Scale 1/8” = 1’-0”): 1. Revised shop drawing showing actual installation. Provide both hard copy and electronic (AutoCAD latest edition). 1.4 QUALITY ASSURANCE A. The GHEX contractor must have on this project a certified IGSHPA installer. The GHEX contractor performing this work must have a minimum of two years experience in performing underground closed circuit ground loop work of this project's size or larger. B. Vertical heat exchanger (VHE) fabricators must be heat fusion certified by an authorized high density polyethylene (HDPE) pipe manufacturer's representative of the brand of pipe used. Certification must include: successful completion of a written heat fusion exam as CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 15747 -2 GROUND HEAT EXCHANGER PBC-PROJECT# 09070 (GHEX) HORIZONTAL PIPING DESIGN
Project Rev E_07/02/10 well as demonstrating proper heat fusion techniques under the direct supervision of the authorized HDPE pipe manufacturer's representative. PART 2 - PRODUCTS 2.1 PIPE / TRIM A. The pipe shall be PE3408 HDPE with a minimum cell classification of 345464C per ASTM D3035-93 and a SDR11 (160 psi) rating for u-bends and header pipe 2 inches or smaller and a minimum of DR15.5 (110 psi) for header pipe greater than 2 inch in diameter. This pipe will carry a warranty of no less than 50 years. B. Each pipe shall be permanently indent marked with the manufacturer's name, nominal size, pressure rating, relevant ASTM standards, cell classification number and date of manufacture. C. All piping used for VHE will have factory hot-stamped lengths impressed on the side of the piping indicating the length of the VHE at that point. The length stamp shall read zero on one end and the actual VHE total length on the other end. D. P/T Plugs: Shall be constructed of solid brass and have a dual seal core of Nordel, good up to 350°F for water. Plugs shall be rated zero leakage from vacuum to 1000 psig and are capable of receiving a pressure or temperature probe. E. Butterfly Valve: See Division 15 ‘VALVES’. With exception stem shall be 416 stainless steel. F. Ball Valves: See Division 15 ‘VALVES’ with exception stem and ball shall be stainless steel. G. Check Valves: See Division 15 ‘VALVES’. H. 90° Elbows: Shall be molded out of high density polyethylene resins in accordance with the requirements of ASTM 3261. I. Branch and Service Saddles: Shall be molded out of high density polyethylene resins in accordance with the requirements of ASTM 3261. J. Calibrated Balance Vales: See Division 15 ‘HYDRONIC PAIPING’. 2.2 VAULTS / MANIFOLDS A. A test point vault will be installed between each vault and between the final vault and the building's mechanical room. The test points will be the location where the loopfield flow test, and the loopfield and the building flush out will be done. All valves and piping will be sized to match the piping of the loop field. B. GEOTHERMAL VAULT 1. STRUCTURE: The vault shall be a composite steel and concrete structure. The vault shall be shipped from factory preformed for a concrete pour with all rein- CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 15747 -3 GROUND HEAT EXCHANGER PBC-PROJECT# 09070 (GHEX) HORIZONTAL PIPING DESIGN
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Revised Specifications - the Public Building Commission of Chicago

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