SECTION HYDRONIC PIPING

Transcription

1 PART 1 GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions Specification Sections, apply to this Section. B. Related Sections: The following Sections contain requirements that relate to this Section: 1. Drawings and general provisions of the Contract, including General and Supplementary Conditions Specification Sections, apply to this Section. 2. Section Access Doors and Panels : Product requirements for access doors for placement by this section. 3. Section Painting : Product requirements Painting for placement by this section. 4. Section Hanger and Supports : Product and execution requirements for placement of pipe support. 5. Section Vibration, and Seismic Control for HVAC Piping: Product requirements for Vibration Isolation for placement by this section. 6. Section Mechanical Identification. 7. Section HVAC Insulation : Product requirements for Piping Insulation for placement by this section. 8. Section Valves : Product requirements for valves. 1.2 SUMMARY A. Section includes pipe and pipe fittings for: heating water, condenser water, chilled water, and other mechanical systems piping. 1.3 REFERENCES A. ASME (American Society of Mechanical Engineers) - Boiler and Pressure Vessel Codes, SEC IX - Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators. B. ASME B16.22 (American Society of Mechanical Engineers) - Wrought Copper and Copper Alloy Solder Joint Pressure Fittings. C. ASME B31.9 (American Society of Mechanical Engineers) - Building Services Piping. D. ASME SEC VIII-D (American Society of Mechanical Engineers) - Boilers and Pressure Vessels Code, Rules for Construction of Pressure Vessels. E. ASME B16.3 (American Society of Mechanical Engineers) - Malleable Iron Threaded Fittings Class 50 and 300. F. ASME B16.18 (American Society of Mechanical Engineers) - Cast Copper Alloy Solder Joint Pressure Fittings. G. ASME B16.22 (American Society of Mechanical Engineers) - Wrought Copper and Page 1 of 25

2 Copper Alloy Solder Joint Pressure Fittings. H. ASME B31.9 (American Society of Mechanical Engineers) - Building Services Piping. I. ASTM A53 - Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. J. ASTM B32 - Solder Metal. K. ASTM B88 - Seamless Copper Water Tube. L. AWS A5.8 (American Welding Society) - Brazing Filler Metal. M. AWS D1.1 (American Welding Society) - Structural Welding Code. 1.4 SYSTEM DESCRIPTION A. Hydronic systems are low water temperature, forced, recirculating systems and include 2-pipe and 4-pipe, hot water, and chilled water systems, and condenser water systems. B. Four-Pipe System: The 4-pipe system includes independent chilled water and hot water supply and return piping mains in a closed loop, connecting chillers and boilers to terminal heattransfer units by means of primary and secondary piping loops. Circulation is accomplished by parallel, constant volume, primary pumps; and independent secondary pumps. Design flow rates and water temperatures are specified in the various equipment specifications and schedules. Control sequences and temperature-reset schedules are specified in temperaturecontrol specifications. C. Condenser Water System: This system is an open piping loop connecting a chiller s condensing barrel to an associated cooling tower. Circulation is accomplished by parallel, constant volume pumps. Design flow rates and water temperatures are specified in the various equipment specifications and schedules. Control sequences and temperature-reset schedules are specified in temperature-control specifications. 1.5 SUBMITTALS A. General: Submit each item in this Article according to the Conditions of the Contract Specification Sections. B. Product Data including rated capacities of selected models, weights (shipping, installed, and operating), furnished specialties, accessories, and installation instructions for each hydronic specialty and special-duty valve specified. 1. Submit flow and pressure drop curves for diverting fittings and calibrated plug valves, based on manufacturer's testing. C. Shop Drawings detailing pipe anchors, special pipe support assemblies, alignment guides, and expansion joints and loops. D. Field test reports indicating and interpreting test results for compliance with performance requirements specified in Part 3 of this Section. Page 2 of 25

3 E. Maintenance data for hydronic specialties and special-duty valves to include in the operation and maintenance manual. 1.6 CLOSEOUT SUBMITTALS A. Operation and Maintenance Data: Submit instructions for installation and changing components, spare parts lists, exploded assembly views. 1.7 QUALIFICATIONS A. Contractor: Company staff specializing in manufacturing products specified in this section with minimum three years experience. B. Fabricator or Installer: Company and company field staff specializing in performing Work of this section with minimum five years experience. 1.8 PRE-INSTALLATION MEETING A. Convene minimum one week prior to commencing Work of this section. 1.9 DELIVERY, STORAGE, AND HANDLING A. Accept valves on site in shipping containers with labeling in place. Inspect for damage. 1. Provide temporary end caps and closures on piping and fittings. Maintain in place until installation. 2. Protect piping systems from entry of foreign materials by temporary covers, completing sections of the work, and isolating parts of completed system Protect 1.10 ENVIRONMENTAL REQUIREMENTS A. Do not install underground piping when bedding is wet or frozen FIELD MEASUREMENTS A. Verify field measurements prior to fabrication WARRANTY A. Provide one year manufacturer warranty for valves excluding packing INTERFERENCE DRAWINGS A. Interference drawings shall be prepared as a combined effort of all disciplines on the project. Each discipline shall proceed with their own set of drawings on mylar backgrounds prepared by the HVAC trade who shall start their drawings immediately upon award of contract. Drawings shall be at 1/4" = 1'0" scale based on sheet size and plan location and orientation as shown on the architectural drawings. All interference drawings shall be capable of being overlaid to coordinate interferences and for printing. All congested areas and mechanical room plans shall be drawn at 3/8" = 1'0" scale (both elevation and plan views shall be provided). Page 3 of 25

4 1. Interference drawings shall be carefully coordinated with existing conditions at the job site. The existing conditions include servicing clearances for existing major equipment. B. After the HVAC trade has finished, two reproducibles will be forwarded to the plumbing trade who will show and coordinate the plumbing work with the other trades. After the plumbing trade has finished, two reproducibles will be forwarded to the electrical discipline who will show and coordinate their work on the combined plans. C. Interference plans and elevations shall show in detail the location of the following items which require coordination because of size and proximity to other equipment and systems. Drawings shall show in order of installation priority within the allotted space the following: 1. Ductwork and mechanical equipment exposed or in ceiling plenums. 2. Gravity drains for condensate, waste, vent or storm systems. 3. Sprinkler piping. 4. Electrical conduits 2 inches and larger and electrical equipment. 5. Mechanical and electrical work in equipment rooms. D. Each discipline shall prepare overlay prints showing all of the items simultaneously, paying particular attention to crossovers. Each discipline shall be responsible for coordinating their work with other trades. E. Reproducible copies of the finished interference drawings shall be submitted to the Owner for record before actual installation work begins. Each discipline shall make completed interference drawings available to their craft for installation of the work. F. Individual trade interference drawings may be used as shop drawings and/or as record drawings at the completion of the project. CADD drawings with level structure may be optioned provided each discipline has the ability, as well as agrees, to provide such a drawing, coordinate the level structure and CADD version QUALITY CONTROL A. ASME Compliance: Comply with the following provisions: 1. ASME B31.9, "Building Services Piping," for materials, products, and installation. Safety valves and pressure vessels shall bear the appropriate ASME label. 2. Fabricate and stamp air separators and compression tanks to comply with ASME Boiler and Pressure Vessel Code, Section VIII. 3. Welding Standards: Qualify welding processes and operators according to ASME Boiler and Pressure Vessel Code, Section IX, "Welding and Brazing Qualifications." 1.15 COORDINATION A. Coordinate layout and installation of piping with equipment and with other installations. B. Coordinate pipe sleeve installation for foundation wall penetrations. C. Coordinate installation of roof curbs, equipment supports, and roof penetrations. Roof specialties are specified in Division 7 Sections. D. Coordinate pipe fitting pressure classes with products specified in related Sections. Page 4 of 25

5 E. Coordinate size and location of concrete housekeeping pads. Cast anchor-bolt inserts into pad. Concrete, reinforcement, and formwork requirements are specified in Division 3 Sections. F. Coordinate installation of pipe sleeves for penetrations in exterior walls and floor assemblies. Coordinate with requirements for firestopping specified in Division 7 Section "Firestopping" for fire and smoke wall and floor assemblies EXTRA MATERIALS A. Maintenance Stock: Furnish a sufficient quantity of chemicals for initial system startup and for preventive maintenance for one year from Substantial Completion. PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated in the Work include, but are not limited to, the following: B. Manufacturers: Subject to compliance with requirements, provide products by one of the following: 1. Calibrated Plug Valves: a. Amtrol, Inc. b. Armstrong Pumps, Inc. c. Taco, Inc. 2. Pressure-Reducing Valves: a. Amtrol, Inc. b. Armstrong Pumps, Inc. c. ITT Hoffman; ITT Fluid Handling Div. 3. Safety Relief Valves: a. Amtrol, Inc. b. Armstrong Pumps, Inc. c. Conbraco Industries, Inc. d. ITT Fluid Technology Corp.; ITT McDonnell & Miller. 4. Automatic Flow-Control Valves: a. Griswold Controls. b. Nexus 5. Compression Tanks: a. Armstrong Pumps, Inc. b. Cemline c. ITT Fluid Technology Corp.; ITT Bell & Gossett. d. Taco, Inc. e. Wendland 6. Diaphragm-Type Compression Tanks: a. Amtrol, Inc. b. Armstrong Pumps, Inc. c. ITT Fluid Technology Corp.; ITT Bell & Gossett. d. Taco, Inc. 7. Air Separators: a. Amtrol, Inc. Page 5 of 25

6 b. Armstrong Pumps, Inc. c. ITT Fluid Technology Corp.; ITT Bell & Gossett. 8. Pressure Reducing Valve a. Fisher b. Leslie c. Spence 9. Safety or Pressure Relief Valves a. Kunkle b. Lonergan 2.2 CONDENSER WATER PIPE - ABOVEGROUND Pressure Temperature Construction Up to 175 psig design 35 to 100 deg. F 2" and under: Threaded connections. 2-1/2" and over: Butt welded with welded flanges. Expansion Control Pipe Provide all necessary expansion loops or expansion joints as scheduled, indicated on the drawings, or as required to control expansion in the distribution system. Additional loops and expansion devices shall be added to control thermal and pressure conditions as a result of system requirements due to unseen conditions. 2" and under: ERW or Seamless, Schedule 80, ASTM A-53 or A-106, Grades A or B with ends threaded and coupled. 2-1/2" and over: ERW or Seamless, standard weight, ASTM A-53 or A-106, Grades A or B with ends beveled for welding. Fittings 2" and under: Cast iron, screwed fittings, ASTM A-126, 125 lb., banded. 2-1/2" and over: Standard weight butt weld fittings, ASTM A-234 WPB. Use long radius (R = 1.5D) elbows unless space confines require short radius. The Owner shall be notified of all exceptions. Unions Flanges 2" and under: Malleable iron, screwed, ground joint, brass to iron seat, ASTM A-197, Class 150, Stockham Figure 694, rated 300 psig NSC-WOG. 2" and under: Forged steel, screwed, ASTM A-181 Class 250 or better to match mating flange. 2-1/2" and over: Forged steel, weld neck or slip-on, ASTM A-181, Class 250 or better to match mating flange. Branch Connections Main line sizes 2" and under: Use fittings Main line sizes larger than 2" and branch size 2" and under: Use standard weight threadolet welded directly to main. Main line sizes larger than 2" and branch size equal to main: Use butt weld tee. Page 6 of 25

7 Main line sizes larger than 2-1/2" and branch size one or two sizes smaller than main: Weld standard weight weldolet directly to main or use reinforced fabricated steel welding saddle. Main line sizes larger than 6 and branch sizes three or more sizes smaller than main: Weld branch pipe directly to main. Provide reinforcing in accordance with ANSI/ASME B31.1 Refer to article "Fabricated Branch Connections for Steel Piping" in Section "Basic Mechanical Materials and Methods" for further requirements. Gaskets Bolts & Nuts Bolt Lubricant Thread Dope Gate Valves 1/16" minimum thickness, full face for flat face flanges and ring type for raised face flanges, Garlock, Flexitallic, or Gortex. Square head carbon steel bolts per ASTM A-307 Grade B with hex head carbon steel nuts per ASTM A-563 Grade A. "NO-OX-ID" grease or approved equal. Teflon tape on male threads only. 2" and under: Nibco Figure T-111, ANSI Class 150, 200 psig NSC-WOG. Bronze gate with solid wedge, rising stem, screwed in bonnet and threaded end connections. 2-1/2" and over (to 24"): Nibco Figure F-617, ANSI Class 150 psi, 200 psig NSC-WOG. Iron body gate with solid wedge, bronze trim, outside screw and yoke, bolted bonnet and flanged end connections. Plug Valves 1/2" through 2": DeZurik 118-S, 1, RS16 (180 deg. F), ALG, ANSI Class 150, 175 psig NSC-WOG. Valve shall be eccentric, resilient plugs with cast iron body and screwed end connections. Valve shall be provided with Buna packing and non-lubricated stainless steel bearings. Valves shall be suitable for bi-directional flow but shall be installed with flow to back of seat. Valves shall include a lever handle with memory stop. 2-1/2" and over: DeZurik 128-F, 1 (or 6), RS16 (or RS17), ALG (or AGGXH6), ANSI Class 150 NSC-WOG. Valves shall be same as smaller valves except with flanged ends and provided with nickel seats. Valves 16" and over and located at pump discharges shall have gauge tapping on downstream side of valve. Valves 4" and over and located in branch lines without a flow measuring station shall have two gauge tappings. Valves 10" and larger shall be provided with a geared handwheel actuator and memory stop. All geared actuators shall include a gasketed coverplate. Ball Valves 2" and under: Nibco Figure T , rated 600 psig NSC-WOG and 150 psig SWP. Bronze two-piece body with chromium plated ball, Teflon seats and stuffing box, blowout proof stem design, lever operator and threaded end connections. Memory stops shall be provided where valves are being provided as balancing valves and balancing valves are indicated on the Drawings. Page 7 of 25

8 Lug-Style Butterfly Valves 2-1/2" and over: Nibco LD (or -5), LD (or -5), 175 psig NSC-WOG. Valves shall have ductile iron lug body with aluminum bronze (or ductile iron with nickel edge) disc and minimum of three copper alloy bushings. Valves shall be equipped with stainless steel stem and molded in EDPM liner and seats rated for 200 deg. F minimum. Valves shall be suitable for bubble-tight dead end service at rated pressure. Valves 8" and under shall be equipped with a 10-position lever operator unless otherwise noted. Valves 10" and over shall be equipped with a gear operator. All gear operators shall include a gasketed coverplate. Valves used as balancing valves shall be provided with infinitely positionable valve operator and a memory stop. Check Valve 2" and under: Nibco Figure T-413, ANSI Class 150, 200 psig NSC-WOG. Bronze, threaded, regrinding type, renewable disc, Y-pattern horizontal swing and Buna seat. 2-1/2" and over: Techno Style ANSI Class 150 NSC-WOG. Valves shall be wafer style split disc check with cast iron bodies, aluminum-bronze valve plates, EPDM (or Buna) seals, and 316 stainless steel spring and trim. Strainers 2" and under: Sarco Figure BT, rated 400 psig NSC-WOG. Bronze Y-pattern threaded body. 2-1/2" and over: Sarco Figure IF-125 rated 200 psig (150 psig over 12") NSC-WOG. Cast iron Y-pattern body with Class 250 flanged ends. Pump Connectors (for axial movement) Heat Exchanger Installations 1-1/2" and over (to 12"): Mason Industries Heavy Duty Super-Flex MFNC, rated 285 psig minimum at 100 deg. F. Multi-layered nylon tire cord fabric reinforcement with EDPM cover and liner. Ends shall be reinforced with steel wire bead rings. Connectors shall be furnished with Class 250 or better flanged ends and control rods. Units shall be suitable for minimum 1/2" minimum axial motion. All condenser water piping shall be insulated when a heat exchanger is used for Free Cooling in conjunction with the Central Plane System. Insulation shall be the same materials as those used for the chilled water piping. 2.3 NON-POTABLE WATER PIPE - UNDERGROUND Pressure Temperature Construction Up to 175 psig - design; (weak links - gate valves 14" and larger 150 psi. Up to 230 psig actual. 35 to 100 deg. F 2" and under: Socket welded or butt welded. 2-1/2" and over: Butt welded connections. Page 8 of 25

9 Expansion Control Carrier Pipe Provide all necessary expansion loops or expansion joints as scheduled, indicated on the drawings, or as required to control expansion in the distribution system. Additional loops and expansion devices shall be added to control thermal and pressure conditions as a result of system requirements due to unseen conditions. 2" and under: ERW or Seamless, Schedule 80, ASTM A-53 or A-106, Grades A or B with square ends. 2-1/2" and over: ERW or Seamless, standard weight, ASTM A-53 or A-106, Grades A or B with ends beveled for welding. Insulation Special Note Jacketing Material Insulation of Joints Fittings Polyurethane foam as specified in Section HVAC Insulation". Insulation shall completely fill the annular space between the carrier pipe and jacketing. Insulation shall be a nominal 2" thick. Insulation is not required on non-potable piping, 14-inch pipe size and larger. However, tape coating is required in accordance with Specification Section "Tape Coating System for Buried Steel Pipe". High density polyethylene or as specified in Section "HVAC Insulation". All straight joints shall be insulated using polyurethane foam and covered with the same material as the pipe jacketing. 2" and under: Forged steel, socket weld fittings, ASTM A-105, 2000 lb. or standard heavy weight butt weld fittings, ASTM A-234 WPB. 2-1/2" and over: Standard weight butt weld fittings, ASTM A-234 WPB. Use long radius (R = 1.5D) elbows wherever possible. Unions Flanges Not permitted. 2" and under: Forged steel, socket weld, weld neck, or slip-on ASTM A-181 Class 150 or better to match mating flange. 2-1/2" and over: Forged steel, weld neck or slip-on, ASTM A-181, Class 150 or better to match mating flange. Branch Connections Main line sizes 2" and under: Use fittings Main line sizes larger than 2" and branch size 2" and under: Use standard weight weldo-let or sock-o-let welded directly to main. Main line sizes larger than 2" and branch size equal to main: Use butt weld tee. Main line sizes larger than 2-1/2" and branch size one or two sizes smaller than main: Weld standard weight weldolet directly to main or use fabricated steel welding saddle. Page 9 of 25

10 Main line sizes larger than 6 and branch sizes three or more sizes smaller than main: Weld branch pipe directly to main; provide reinforcing in accordance with ANSI/ASME B31.1. Refer to article "Fabricated Branch Connections in Steel Piping" in "Basic Mechanical Materials and Methods" Section for further requirements. Gaskets Bolts & Nuts 1/16" minimum thickness, full face for flat face flanges and ring type for raised face flanges, Garlock, Flexitallic, or Gortex. Square head carbon steel bolts per ASTM A-307 Grade B with hex head carbon steel nuts per ASTM A-563 Grade A. All bolts shall be painted with bituminous paint and buried in tar following installation and tightening. Bolt Lubricant Backfill "NO-OX-ID" grease or approved equal. Shall be tamped compactly in place so as to assume a stable surface. No rock shall be used in the first foot of backfill. A minimum of 24" of fill meeting H-20 highway loading shall be used between top of pipe and grade. 2.4 HIGH PRESSURE CHILLED WATER PIPE ABOVEGROUND Pressure Temperature Construction Pipe Up to 285 psig (non shock) 35 to 100 deg. F 2" and under: Socket weld wrought steel, butt weld connections. 2 1/2" and over: Butt welded connections with welded flanges. 2" and under: ERW or Seamless, Schedule 40, ASTM A 53 or A 106, Grades A or B with ends plain or beveled for welding. Exception: Where screwed end connections are required for unions or valves use Schedule 80 pipe nipples; limit nip ple lengths to 12". 2 1/2" and over: ERW or Seamless, standard weight, ASTM A 53 or A 106, Grades A or B with ends beveled for welding. Fittings 2" and under: Forged steel, socket weld fittings, ASTM A 105, 2000 lb., standard weight butt weld fittings, ASTM A 234 WPB. 2 1/2" and over: Standard weight butt weld fittings, ASTM A 234 WPB. Use long radius (R = 1.5D) elbows wherever possible. Unions 2" and under: Malleable iron, screwed, ground joint, brass to iron seat, ASTM A 197, Class 150, Stockham 694 or approved, rated 300 psig NSC WOG. Flanges 2" and under: Forged steel, socket weld, ASTM A 105 or A 181, Class 150 or better to match mating flange. 2 1/2" and over: Forged steel, weld neck or slip on, ASTM A 105 or A 181, Class 150 or better to match mating flange. Page 10 of 25

11 Bolts & Nuts Bolt Lubricant Thread Dope Square head carbon steel bolts per ASTM A 307 Grade B with hex head carbon steel nuts per ASTM A 563 Grade A. "NO OX ID" grease or approved equal. Teflon tape on male threads only. Branch Connections Branch size equal to main: Use socket weld or butt weld tee. 2" and under: Use socket weld reducing tee, or use standard weight sockolet welded directly to main. 2 1/2" and over: Use butt weld reducing tee, or use stan dard weight weldolet welded directly to main or use reinforced fabricated branch connections. Provide reinforcing in accordance with ANSI/ASME B31.1. Refer to article "Fabricated Branch Connections for Steel Piping" in "Basic Mechanical Materials and Methods" Section for further requirements. Gaskets Gate Valves 1/16" thickness, ring type, red rubber, Garlock or approved equal. 2" and under: Nibco Figure T 134, ANSI Class 150, 300 psig NSC WOG. Bronze block pattern gate with solid wedge, rising stem, union bonnet and threaded end connections. 2 1/2" and over: Nibco Figure CS 102 U, ANSI Class 150, 285 psig NSC WOG. Cast steel gate with flexible wedge, universal trim, outside screw and yoke, bolted bonnet and flanged end connections. Valves 6" to 12" shall be provided with 1" ball valve bypass; valves 14" and over shall be provided with 2" ball valve bypass. Plug Valves 1/2" through 2": DeZurik 128 S, 1, RS16 (180 deg. F), AGG3H6, Fig ANSI Class 150, 285 psig NSC WOG. Valves shall be eccentric, resilient plugs with carbon steel body and screwed end connections. Valves shall be provided with Buna packing and stainless steel non lubricated bearings. Valves shall be suitable for bi directional flow but shall be installed with flow to back of seat. Valves shall include a geared handwheel actuator and memory stop. All geared actuators shall include a gasketed coverplate. 2 1/2" and over: DeZurik 128 F, 1 (or 6), RS16 (or RS17), AGG_H_, Fig. 603 (or 604). ANSI Class 150, 285 psig NSC WOG. Valves shall be same as smaller valves except with flanged end connections and provided with welded nickel seats. Valves 14" and over and located at pump discharges shall have gauge tapping on downstream side of valve; valves 4" and over and located in branch lines without a flow measuring station shall have two gauge tappings. Ball Valves 2" and under: Nibco Figure T , rated 600 psig NSC WOG and 150 psig SWP. Bronze two piece body with chromium plated ball, Teflon seats and stuffing box, blowout proof stem design, 1 1/4" extended lever operator and threaded end connections. Memory stops shall be provided only where indicated on the Drawings. Lug-Style Lug-Style Page 11 of 25

12 Butterfly Valves 2-1/2" and over: DeZurik BHP, L1, CS, TC, CSN, S2, FT, TT, ANSI Class 150 with Class VI shutoff, 285 psig NSC-WOG. Valves shall have carbon steel lug body with nickel plated carbon steel disc and two PTFE lined 317 stainless steel bearings. Valves shall be equipped with a 316 stainless steel shaft, pinned tangentially, and PTFE seats with titanium ring. Shaft seals shall be PTFE V-flex suitable for service up to 300 deg. F. Valves 6" and under shall be equipped with a 10-position level operator unless otherwise noted. Valves 8" and over shall be equipped with a gear operator. All gear operators shall include a gasketed coverplate. Valves used as balancing valves shall be provided with infinitely positionable valve operator and memory stop. Valves 6" to 12" shall be provided with an externally piped 1" ball valve bypass; valves 14" and over shall be provided with an externally piped 2" ball valve bypass. Page 12 of 25

13 Butterfly Valves 2 1/2" and over: DeZurik BHP, L1, CS, TC, CSN, S2, FT, TT, ANSI Class 150 with Class VI shutoff, 285 psig NSC WOG. Valves shall have carbon steel lug body with nickel plated carbon steel disc and two PTFE lined 317 stainless steel bearings. Valves shall be equipped with a 316 stainless steel shaft, pinned tangentially, and PTFE seats with titanium ring. Shaft seals shall be PTFE V flex suitable for service up to 300 deg. F. Valves 6" and under shall be equipped with a 10 position level operator unless otherwise noted. Valves 8" and over shall be equipped with a gear operator. All gear operators shall include a gasketed coverplate. Valves used as balancing valves shall be provided with infinitely positionable valve operator and memory stop. Valves 6" to 12" shall be provided with an externally piped 1" ball valve bypass; valves 14" and over shall be provided with an externally piped 2" ball valve bypass. Check Valves 2" and under: Nibco Figure T 433, ANSI Class 150, 300 psig NSC WOG designed for horizontal or vertical flow configurations. Bronze, regrinding type, renewable disc, Y pattern horizontal swing and Buna seat and threaded end connections. 2 1/2" and over: Techno Style ANSI Class 150, 285 psig NSC WOG. Valves shall be wafer style split disc check with carbon steel or ductile iron bodies and valve plates, Buna N seals, and 316 stainless steel spring and trim. Strainers 2" and under: Sarco Figure BT, rated 400 psig NSC WOG. Bronze Y pattern threaded body. 2 1/2" and over: Sarco Figure 34 rated 285 psig NSC WOG. Cast steel or ductile iron Y pattern body with Class 150 flanged end connections. Pump Connectors (for axial movement) 1 1/2" and over (to 12"): Mason Industries Heavy Duty Super Flex MFNC, rated 285 psig minimum at 100 deg. F. Multi layered nylon tire cord fabric reinforcement with EDPM cover and liner. Ends shall be reinforced with steel wire bead rings. Connectors shall be furnished with Class 150 or better flanged ends and control rods. Units shall be suitable for minimum 1/2" minimum axial motion. 2.5 CHILLED WATER AND HEATING HOT WATER PIPING (ALTERNATE) - ABOVEGROUND Pressure Temperature Construction Up to 300 psig - design; up to (220) psig actual (Weak links valves and flanges). 35 deg. F to 200 deg. F 2" and under: Soldered connections, 95-5 solder with non-corrosive flux. 2-1/2" through 4": Soldered connections, 95-5 solder with non-corrosive flux; use solder or flanged connections at valves. Expansion Page 13 of 25

14 Control Provide all necessary expansion loops or expansion joints as scheduled, indicated on the drawings, or as required to control expansion in the distribution system. Additional loops and expansion devices shall be added to control thermal and pressure conditions as a result of system requirements due to unseen conditions. Pipe Fittings Unions 4" and under: Type "L" hard drawn copper conforming to ASTM B-88. 4" and under: Solder type, wrought or cast bronze pressure fittings conforming to ASTM B-61, B-62 or B-75. 3" and under: Solder type, cast bronze pressure type, or better, Nibco Figure 733 or approved, rated 300 psig NSC-WOG. 4" size: Use companion flanges. Flanges Branch Connections 4" and under: Solder type, cast bronze pressure type, Class 150, Nibco Figure 771 or approved, rated 225 psig NSG-WOG. 4" and under: Use solder type, wrought or cast bronze pressure tees, reducing tees, or crosses conforming to ASTM B-61, B-62, or B-75 or use T-drilled piping with brazed joints. Refer to article "Fabricated Connections in Copper Piping (T-Drill)" in "Basic Mechanical Materials and Methods" Section for further requirements. Gaskets Bolts & Nuts Bolt Lubricant Threaded Dope Valves 1/16" minimum thickness, full face for flat face flanges and ring type for raised face flanges, Garlock, Flexitallic, or Gortex. Square head bronze bolts with bronze hex nuts. "NO-OX-ID" grease or approved equal. Teflon tape on male threads only. Same as specified except with solder ends. Do not use iron body valves. 2.6 CHILLED WATER - STEEL PIPE - UNDERGROUND Pressure Temperature Construction Expansion Control Up to 285 psig (non-shock) 35 to 100 deg. F Welded construction. Exception: flanges will be permitted only at valves. Provide all necessary expansion loops or expansion joints as scheduled, indicated on the drawings, or as required to control expansion in the distribution system. Additional loops Page 14 of 25

15 and expansion devices shall be added to control thermal and pressure conditions as a result of system requirements due to unseen conditions. Carrier Pipe Insulation Jacketing Material Insulation of Joints Fittings Flanges Gaskets Bolts ERW or seamless, standard weight steel ASTM A-53 or A-106, Grades A or B with ends beveled for welding. Polyurethane foam as specified in Section "HVAC Insulation". Insulation shall completely fill the annular space between the carrier pipe and jacketing. Insulation shall be a nominal 2" thick. As specified in Section "HVAC Insulation". All straight joints shall be insulated using polyurethane foam and covered with the same material as the pipe jacketing. Standard weight butt weld fittings, ASTM A-234 WPB. Use long radius (R=1.5D) elbows unless space confines require short radius. The Owner and Engineer shall be notified of all exceptions. Field insulated and jacketed with same material as straight pipe using manufacturer's standard fitting insulation. Forged steel, weld neck or slip-on, ASTM A-105 or A-181, Class 150 or better to match mating flange. 1/16" minimum thickness, full face for flat face flanges and ring type for raised face flanges, Garlock, Flexitallic, or Gortex. Square head carbon steel bolts per ASTM A-307 Grade B with hex head nuts per ASTM A-563 Grade A. All bolts shall be painted with bituminous paint and buried in tar following installation and tightening. Bolt Lubricant Backfill "NO-OX-ID" grease or approved equal. Shall be tamped compactly in place so as to assume a stable surface. No rock shall be used in the first foot of backfill. A minimum of 24" of fill meeting H-20 highway loading shall be used between top of pipe and grade. 2.7 HEATING SERVICE HOT WATER PIPE - ABOVEGROUND Pressure Temperature Special Note Construction Up to 200 psig - design; up to (250) psig actual. (NOTE: Design pressure to 175 psig with copper limited to 2" and under) 35 to 250 deg. F Due to economics, the Contractor can select the break-off size between copper and steel piping. 4" and under: Soldered connections, 95-5 solder with non-corrosive flux. Page 15 of 25

16 2-1/2" and over: Butt welded with welded flanges. Expansion Control Provide all necessary expansion loops or expansion joints as scheduled, indicated on the drawings, or as required to control expansion in the distribution system. Additional loops and expansion devices shall be added to control thermal and pressure conditions as a result of system requirements due to unseen conditions. Pipe 4" and under: Type "L" hard drawn copper conforming to ASTM B /2" and over: ERW or Seamless, standard weight, ASTM A-53 or A-106, Grades A or B with ends beveled for welding. Fittings 4" and under: Solder type, wrought or cast bronze pressure fittings conforming to ASTM B-61, B-62, or B /2" and over: Standard weight butt weld fittings, ASTM A-234 WPB. Use long radius (R = 1.5D) elbows unless space confines require short radius. The Owner and Engineer shall be notified of all exceptions. Unions 3" and under: Solder type, cast bronze pressure type, Nibco Figure 733 or approved, rated 150 psig WOG non-shock at 250 deg. F. 4" size: Use companion flanges. Flanges 4" and under: Solder type, cast bronze pressure type, Class 150 or better, Nibco Figure 741 or approved, rated 190 psig WOG non-shock at 250 deg. F. 2-1/2" and over: Forged steel, weld neck or slip-on, ASTM A-181, Class 150 or better to match mating flange. Branch Connections Main line sizes 4" and under: Use solder type, wrought or cast bronze pressure tees, reducing tees, or crosses conforming to ASTM B-61, B-62. Steel main line sizes larger than 2" and branch size equal to main: Use butt weld tee. Steel main line sizes larger than 2-1/2" and steel branch size one or two sizes smaller than main: Weld standard weight weldolet or threadolet directly to main or use reinforced fabricated steel welding saddle. Main line sizes larger than 6 and steel branch sizes three or more sizes smaller than main: Weld branch pipe directly to main. Provide reinforcing in accordance to ANSI/ASME B31.1. Refer to "Fabricated Branch Connections in Steel Piping" article in "Basic Mechanical Materials and Methods" Section for further requirements. Gaskets Bolts & Nuts 1/16" minimum thickness, full face for flat face flanges and ring type for raised face flanges, Garlock, Flexitallic, or Gortex. For Bronze Flanges: Square head bronze bolts with bronze hex nuts. Page 16 of 25

17 For Steel Flanges: Square head carbon steel bolts per ASTM A-307 Grade B with hex head carbon steel nuts per ASTM A-563 Grade A. Bolt Lubricant Thread Dope "NO-OX-ID" grease or approved equal. Teflon tape on male threads only. Gate Valves 3" and under: Nibco Figure S-111, ANSI Class 125, 170 psig WOG non-shock at 250 deg. F. Bronze gate with solid wedge, rising stem, screwed in bonnet and solder end connections. 2-1/2" and over (to 24"): Nibco Figure F-617, ANSI Class 125, 175 psig (125 psi over 12" size) WOG non-shock at 250 deg. F. Iron body gate with solid wedge, bronze trim, outside screw and yoke, bolted bonnet and flanged end connections. Plug Valves 1/2" through 2": DeZurik 118-S, 1, RS55 (250 deg. F), ALG, ANSI Class 125, 175 psig WOG non-shock at 250 deg F. Valve shall be eccentric, resilient plugs with cast iron body and threaded end connections. Valve shall be provided with Buna packing and non-lubricated stainless steel bearings. Valves shall be suitable for bi-directional flow but shall be installed with flow to back of seat. Valves shall include a lever handle with memory stop. 2-1/2" and over: DeZurik 128-F, 1 (or 6), RS55 or RS56, ALG (or AGGXH6), ANSI Class 125, 175 psig (125 psig over 12") WOG non-shock at 250 deg. F. Valves shall be same as smaller valves except with flanged ends and provided with nickel seats. Valves 16" and over and located at pump discharges shall have gauge tapping on downstream side of valve. Valves 4" and over and located in branch lines without a flow measuring station shall have two gauge tappings. Valves 10" and larger shall be provided with a geared handwheel actuator and memory stop. All geared actuators shall include a gasketed coverplate. Ball Valves Lug-Style Butterfly Valves 2" and under: Nibco Figure S , rated 350 psig WOG non-shock at 250 deg. F and 150 psig SWP. Bronze two-piece body with chromium plated ball, Teflon seats and stuffing box, blowout proof stem design, 1-1/4" extended lever operator and solder end connections. Memory stops shall be provided only where indicated on the Drawings. 2-1/2" and over: Nibco LD (or -5), LD (or -5), 175 psig NSC-WOG. Valves shall have ductile iron lug body with aluminum bronze (or ductile iron with nickel edge) disc and minimum of three copper alloy bushings. Valves shall be equipped with stainless steel stem and molded in EDPM liner and seats rated for 200 deg. F minimum. Valves shall be suitable for bubble-tight dead end service at rated pressure. Valves 6" and under shall be equipped with a 10-position lever operator unless otherwise noted. Valves 8" and over shall be equipped with a gear operator. All gear operators shall include a gasketed coverplate. Page 17 of 25

18 Valves used as balancing valves shall be provided with infinitely positionable valve operator and memory stop. Butterfly Valve 2-1/2" (thru 12" and over): Nibco GD (or -5), 300 psig NSC-WOG. Valves shall have ductile iron epoxy coated grooved and body with EDPM encapsulated ductile iron disc and three PTFE bronze sintered steel bushings. Valves shall be equipped with stainless steel stem. EDPM liner shall be rated for 200 deg. F minimum. Valves shall be suitable for bubble-tight dead end service at rated pressure. Valves 6" and under shall be equipped with a 10-position level operator unless otherwise noted. Valves 8" and over shall be equipped with a gear operator. All gear operators shall include a gasketed coverplate. Valves used as balancing valves shall be provided with infinitely positionable valve operator and memory stop. Check Valves 3" and under: Nibco Figure S-413, ANSI Class 125, 175 psig WOG non-shock at 250 deg F. Bronze, regrinding type, renewable disc, Y-pattern horizontal swing, and Buna seat with solder end connections. 2-1/2" and over: Techno Style 5050, ANSI Class 125, 175 psig (125 psig over 14") WOG non-shock at 250 deg. F (or Gustin-Bacon Series 350 check valve with grooved end connections). Valves shall be wafer style split disc check with cast iron bodies, aluminum-bronze valve plates, EPDM (or Buna) seals, and 316 stainless steel spring and trim. Strainers 2" and under: Sarco Figure BT, rated 350 psig WOG non-shock at 250 deg. F. Bronze Y-pattern threaded body. 2-1/2" and over: Sarco Figure IF-125 rated 175 psig (125 psig over 12") WOG non-shock at 250 deg. F. Cast iron Y-pattern body with Class 125 flanged end connections. Pump Connectors (for axial movement) 1-1/2" and over (to 12"): Mason Industries Heavy Duty Super-Flex MFNC, rated 245 psig minimum at 250 deg. F. constructed of multi-layered nylon tire cord fabric reinforcement with EDPM cover and liner. Ends shall be reinforced with steel wire bead rings. Connectors shall be furnished with Class 150 or better flanged ends and control rods. Units shall be suitable for minimum 1/2" minimum axial motion. 2.8 HYDRONIC SPECIALTIES A. Manual Air Vent: Cast iron body with stainless steel internal parts; 250-psig working pressure, 300 deg F operating temperature; manually operated with screwdriver or thumbscrew; with 1/8- inch NPS discharge connection and 1/2-inch NPS inlet connection. B. Automatic Air Vent: Hoffman Specialty No. 792 high pressure air vent. Designed to vent automatically with float principle; high tensile cast iron body with stainless still internal parts; 250-psig working pressure, 300 deg F operating temperature; with 1/2-inch NPS discharge connection and 3/4-inch NPS inlet connection. Page 18 of 25

19 C. Diaphragm Type Expansion Tank 1. Provide pressurized diaphragm type expansion tanks as scheduled on the Drawings. 2. Units shall be pre-charged to pressure scheduled as the initial fill pressure of the system. Units shall be suitable for a maximum working pressure of 150 psig and shall be furnished with ASME Boiler and Pressure Vessel Code stamp and certification. Units shall have a sealed in elastomer diaphragm suitable for an operating temperature of 240 deg. F. 3. Tanks to be furnished with saddles for horizontal installation or furnished with base mount for vertical installation as required. 4. Design Basis: Amtrol Ex-Trol Model AX or Ex-Trol Series "L", ASME rated for 250 psig WP. E. Plain Steel Expansion Tank 1. Provide plain steel expansion tanks as scheduled on the Drawings. 2. Tank shall be constructed of carbon steel and shall be supplied with all required taps. Tank shall be constructed in accordance with ASME Boiler and Pressure Vessel Code and stamped for 300 psig design pressure. 3. Tanks on hot water systems over 100 deg. F shall be fitted with an Airtrol Tank fitting to restrict thermal circulation of water between the tank and the system. 4. All tanks shall be fitted with a gauge glass, a drain, and a means for venting air. 5. Provide temporary expansion tanks for testing of all piping systems. F. Air Separators 1. Provide air separator with integral strainer as indicated on the Drawings. 2. Separator shall have cast iron body with flanged or threaded tangential inlet and outlet nozzles suitable for in-line connection. Unit shall have an internal perforated stainless steel air collector tube designed to direct released air to the top of the separator. Unit shall also have a start-up strainer and a removable galvanized steel permanent strainer. Contractor shall remove and clean strainer after 24-hours operations and after 39-days operation. 3. Separator shall be constructed in accordance with ASME Boiler and Pressure Vessel Code and stamped for system design pressure. Unit shall be supplied with a valved blowdown connection to facilitate routine cleaning. 4. Each air separator shall be furnished with a high capacity air vent. Air vent design basis is Bell & Gossett Model Design Basis: ITT Bell & Gossett "Rolairtrol". G. Automatic Flow Control Valves 1. Automatic pressure compensating flow control valves shall be provided for each terminal device requiring this type of balancing valve. Capacities shall be computed from the terminal unit schedule or as indicated. 2. Valves shall be factory set and shall automatically limit the rate of flow to required engineered capacity within plus or minus 5 percent accuracy over an operating pressure differential of 3 to 40 psig required for control. 3. The control mechanism of the valve shall consist of a self-contained, open-chamber cartridge assembly with stainless steel spring and unobstructed flow passages that eliminate accumulation of particles and debris. All internal working parts shall be stainless steel or nickel plated brass. 4. The cartridge assembly shall consist of a spring-loaded cup. The cup shall be guided and shall utilize the full available differential pressure across the valve to actuate the cup Page 19 of 25

20 and thereby reduce friction and hysterisis and eliminate binding. The cartridge assembly must be removable. 5. Valve bodies shall be provided with inlet and outlet tappings suitable for connection of instruments for verification of flow rates. Valve bodies shall be rated for use at not less than 150 percent of system designed operating pressures at 250 deg. F. 6. The differential pressure meter connections shall be constructed with a built-in check valve and shall include a safety cap. The connection shall be a Schrader fitting for pressure only application or a pressure/temperature test station when P/T plugs are detailed. 7. Certified performance data for the flow control valve, based on independent laboratory tests, supervised and witnessed by a registered professional engineer, shall be available. 8. The Flow Control Valves shall include a five year from date of purchase warranty between Owner and the Valve Manufacturer. 9. Sizes 1/2-inch through 2-inches shall be a combination flow control and shut off ball valve, and shall include union connections to provide easy access and removal of the flow control assembly from the pipeline. Valve bodies shall be marked to show direction of flow. 10. Provide a metal identification tag, with wire, for each installed valve. The tag shall be metal stamped with zone or terminal device identification, valve model number, rated flow in GPM and differential pressure range. 11. Provide a strainer upstream of each flow control valve. Strainers shall be as specified in Article entitled Strainers in this Section except for strainers sizes 1-1/2-inch and smaller. Strainers 1-1/2-inch and smaller shall be in-line strainers with removable 316 stainless steel (20 mesh) basket; bronze union body, blowdown valve, P/T plug and ball valve. 12. Flow control valves (and strainers) shall have bodies threaded, sweat, or flanged for the installation. G. Chemical Feeder: Bypass-type chemical feeders of 5-gal. capacity, welded steel construction; 150-psig working pressure; complete with fill funnel and inlet, outlet, and drain valves. 1. Chemicals: Specially formulated to prevent accumulation of scale and corrosion in piping system and connected equipment, and based on a water analysis of makeup water. H. Diverting Fittings: 150-psig working pressure, 250 deg F maximum operating temperature; cast-iron body with threaded ends, or wrought copper with soldered ends. Indicate flow direction on fitting. I. Y-Pattern Strainers: 150-psig working pressure; cast-iron body (ASTM A 126, Class B), flanged ends for 2-1/2-inch NPS and larger, threaded connections for 2-inch NPS and smaller, bolted cover, perforated Type 304 stainless-steel basket, and bottom drain connection. J. Basket Strainers: 150-psig working pressure; high-tensile cast-iron body (ASTM A 126, Class B), flanged end connections, bolted cover, perforated Type 304 stainless-steel basket, and bottom drain connection. K. T-Pattern Strainers: 750-psig working pressure; ductile-iron or malleable-iron body, grooved end connections, Type 304 stainless-steel strainer basket with 57 percent free area; removable access coupling and end cap for strainer maintenance. 2.9 SAFETY OR PRESSURE RELIEF VALVES A. Safety or pressure relief valves shall be provided at pressure reducing stations, pump discharge manifolds, unfired pressure vessels, for testing operations, and where indicated on drawings. Page 20 of 25

21 Valve pressure settings shall be for maximum system setting or as otherwise indicated on the drawings. B. Safety or pressure relief valves shall be of such size that with a blow-off pressure set 6 percent above the normal or 5 psig - whichever is greater, pressure valves shall be wide open, and shall relieve the full inlet flow to the valve. Provide valves sized on the actual residual pressure which will exist when the valve discharges. Valves shall bear an ASME label indicating the operational pressure. C. Safety or pressure relief valve shall be selected and furnished by the equipment supplier whose equipment device is being protected by the device. PART 3 - EXECUTION 3.1 VALVE APPLICATIONS A. General-Duty Valve Applications: Unless otherwise indicated, use the following valve types: 1. Shutoff Duty: Use gate, ball, and butterfly valves. 2. Throttling Duty: Use globe, ball, and butterfly valves with memory stops. B. Install shutoff-duty valves at each branch connection to supply mains, at supply connections to each piece of equipment, and elsewhere as indicated. C. Install throttling-duty valves at each branch connection to return mains, at return connections to each piece of equipment, and elsewhere as indicated. D. Install calibrated plug valves on the outlet of each heating or cooling element and elsewhere as required to facilitate system balancing. E. Install drain valves at low points in mains, risers, branch lines, and elsewhere as required for system drainage. F. Install check valves on each pump discharge and elsewhere as required to control flow direction. G. Install safety relief valves on hot water generators and elsewhere as required by ASME Boiler and Pressure Vessel Code with the pipe discharge to the floor level without valves. Comply with ASME Boiler and Pressure Vessel Code, Section VIII for installation requirements. H. Install pressure-reducing valves on hot water generators and elsewhere as required to regulate system pressure. I. Provide valve stem extensions for all insulated piping. 3.2 PIPING INSTALLATIONS A. Install piping according to Section "Basic Mechanical Materials and Methods", and ASME B 31.9, Building Services Piping, No Exceptions. Page 21 of 25

22 B. Locate groups of pipes parallel to each other, spaced to permit applying insulation and servicing of valves. C. Install drains at low points in mains, risers, and branch lines consisting of a tee fitting, 3/4-inch NPS ball valve, and short 3/4-inch NPS threaded nipple and cap. D. Install piping at a uniform grade of 0.2 percent upward in direction of flow. E. Reduce pipe sizes using eccentric reducer fitting installed with level side up. F. Install branch connections to mains using tee fittings in main with takeoff out bottom of main, except for up-feed risers with takeoff out top of main line. G. Install unions in pipes 2-inch NPS and smaller, adjacent to each valve, at final connections of each piece of equipment, and elsewhere as indicated. Unions are not required at flanged connections. H. Install flanges on valves, apparatus, and equipment having 2-1/2-inch NPS and larger connections. I. Install flexible connectors at inlet and discharge connections to pumps (except in-line pumps) and other vibration-producing equipment. J. Install strainers on supply side of each control valve, pressure-regulating valve, solenoid valve, in-line pump, and elsewhere as indicated. Install 3/4-inch NPS nipple and ball valve in blowdown connection of strainers 2-inch NPS and larger. K. Anchor piping to ensure proper direction of expansion and contraction. L. Provide dielectric connections at all points of connection between dissimilar metals where electrolysis can take place. Provide a brass nipple in a coupling arrangement, minimum 3 in length for hydronic piping that is 2 inch and under in size. All piping 2 ½ inch and over shall be provided with a manufactured insulating isolation type flange with appropriate gaskets and bolts, as well as all necessary amenities designed for the specific application. Install all flange type dielectric fittings per the manufacturers recommended installation practices. 3.3 PIPE JOINT CONSTRUCTION A. Mechanical Joints: Assemble joints according to fitting manufacturer's written instructions. 3.4 HYDRONIC SPECIALTIES INSTALLATION A. Air Vents 1. Air vents shall be installed at the ends of mains, all high points, and where water flow turns downward including branches to down-feed terminal units longer than 10 feet. Where structural conditions do not permit installation of piping as specified and it is necessary to create air pockets or water traps, air vents and drains shall be provided to enable satisfactory and safe operation of the system so that proper circulation and drainage is assured. Provide air pockets of same size as the line being vented at all vent points. 2. Generally, manual vents shall be installed on all concealed piping. Manual vents shall consist of 1/2-inch type "L" copper tubing with a dielectric connection from high point of Page 22 of 25