Attach 05 23_21_13.doc

El Dorado National Forest

SECTION 23 21 13

HYDRONIC PIPING

PART 1

GENERAL

1.1 RELATED DOCUMENTS

A. All applicable provisions of General and Supplementary Conditions form part of this section of specifications.

1.2 SUMMARY

A. This Section includes the following:

1. Radiant hot water heating piping.

2. Solar collector piping.

3. Condenser water piping (above ground).

4. Make-up water piping.

5. Condensate drain piping.

6. Air vent piping.

7. Valves

8. Strainers

9. Pipe Identification B. Related Sections includes the following:

1. Section 23_05_00 “Common Work Results for HVAC” for installation instructions common to most piping systems.

2. Section 23_57_33, “Direct Geoexchange Heat Exchangers” for below ground condenser water piping.

1.3 PERFORMANCE REQUIREMENTS

A. Hydronic piping components and installation shall be capable of withstanding the following minimum working pressure and temperature:

1. Radiant Hot Water Heating Piping: 125 psi at 180 deg F.

2. Solar collector piping:

3. Condenser Water Piping: 125 psi at 150 deg F.

4. Makeup Water Piping: 80 psi at 150 deg F.

5. Condensate Drain Piping: 150 deg F.

6. Air Vent Piping: 200 deg F.

1.4 SUBMITTALS

A. Product Data for the following:

1. Piping Materials.

2. Radiant floor system. Provide submittals for tubing, fittings, and manifolds.

3. Valves. Include flow and pressure drop curves based on manufacturer’s testing for calibrated-orifice balancing valves and automatic flow-control valves.

4. Air control devices.

5. Hydronic specialties.

6. Field Reports

a. Hydrostatic system pressure tests.

b. System start-up test.

B. Welding certificates.

C. Qualification Data: For installers.

D. Operation and Maintenance Data: for radiant floor system, 3 air control devices, hydronic specialties, and special-duty valves to include emergency, operation, and maintenance manuals.

1.5 QUALITY ASSURANCE

A. Steel Support Welding: Qualify processes and operators according to AWS D1.1/D1.1M, “Structural Welding Code – Steel.”

B. Welding: Qualify processes and operators according to ASME Boiler and Pressure Vessel Code: Section IX, “Welding and Brazing Qualifications.”

1. Comply with provisions in ASME B31 Series, “Code for Pressure Piping.”

2. Certify that each welder has passed AWS qualifications tests for welding processes involved with that certification is current.

C. ASME Compliance: Comply with ASME B31.9, “Building Services Piping,” for materials, products, and installation. Safety valves and pressure vessels shall bear the appropriate ASME label. Fabricate and stamp air separators and expansion tanks to comply with ASME Boiler and Pressure Vessel Code: Section VIII, Division I.

D. Identification: Provide piping specialties with manufacturer’s name or trademark and pressure rating clearly on valve body.

1.6 COORDINATION

A. Systems shall be tested, adjusted, and balanced in compliance with Section 23 05 93. Obtain written permission of the Contracting Officer before applying insulation to exterior of above ground condenser water system, chilled water system, and radiant flooring system.

B. At the Contractor’s option and with the Architect’s permission, piping systems may be insulated prior to being tested, adjusted, and balanced. Piping insulation shall terminate immediately adjacent to each flow control valve, automatic control valve or device. The ends of the pipe insulation and the space between ends of pipe insulation and piping shall be sealed with waterproof vapor barrier coating. After completion of the work in this section, the flow control valves and devices shall be insulated.

1.7 EXTRA MATERIALS

A. Water-Treatment Chemicals: Furnish enough chemicals for initial system start-up and for preventative maintenance for one year form date of Substantial Completion.

PART 2

PRODUCTS

2.1 COPPER TUBE AND FITTINGS

A. Drawn-Temper Copper Tubing: ASTM B 88.

B. Annealed-Temper Copper Tubing: ASTM B 88.

C. DWV Copper Tubing: ASMT B306, Type DWV.

D. Wrought-Copper Fittings: ASME B16.22.

1. Available Manufacturers: Subject to compliance with requirements, manufacturers, offering products that may be incorporated into the Work included, but are not limited to, the following:

a. Anvil International, Inc.

b. S.P. Fittings: a division of Star Pipe Products.

c. Victaulic Company of America.

E. Wrought-Copper Unions: ASME B16.22

2.2 JOINING MATERIALS

A. Pipe-Flange Gasket Materials: Suitable for chemical and thermal conditions of piping system components.

1. ASME B16.21, nonmetallic, flat, asbestos-free, 1/8-inch maximum thickness unless thickness or specific material is indicated.

a. Full-Face Type: For flat face, Class 125 cast-iron and cast-bronze flanges.

b. Narrow-Face Type: For raised face, Class 250, cast-iron and steel flanges.

B. Flange Bolts and Nuts: ASME B18.2.1, carbon steel, unless otherwise indicated.

C. Solder Filler Metals: ASTM B32, lead-free alloys. Include water-flushable flux according to ASTM B 813.

D. Brazing Filler Materials: AEWS A5.8, BCuP Series, copper-phosphorus alloys for general-duty brazing, unless otherwise indicated.

E. Gasket Material: Thickness, material, and type suitable for fluid to be handled and working temperatures and pressures.

2.3 RADIANT FLOOR TUBING, FITTINGS AND MANIFOLDS

A. Cross-link polyethylene (PEX), 1/2 inch diameter, with oxygen diffusion barrier.

B. ASTM F876-93; rated at 100 psi and 180 deg F.

C. All other piping associated with the radiant floor system shall be Type L Copper except that PEX maybe used for underground piping.

D. Fittings for the PEX tubing shall be copper or brass insert or compression type or other approved fitting type approved by the manufacturer.

E. All manifolds shall provide the ability provide flow adjustment capabilities to balance loop. Manifold stations shall have supply and return temperature gages.

2.4 DIELECTRIC FITTINGS

A. Description: Combination fitting of copper alloy and ferrous materials with threaded, solder-joint, plain, or weld-neck end connections that match piping system materials.

B. Insulating Material: Suitable for system fluid, pressure, and temperature.

C. Dielectric Unions:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

a. Capitol Manufacturing Co.

b. Central Plastics Co.

c. Hart Industries, International, Inc.

d. Watts Industries, Inc.; Water Products Div.

e. Zurn Industries, Inc.; Wilkins Div.

2. Factory-fabricated union assembly, for 250 psi at minimum working pressure at 200 deg F as required to suit system pressures.

D. Dielectric Flanges:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

a. Capitol Manufacturing Co.

b. Central Plastics Co.

c. Watts Industries, Inc.; Water Products Div.

2. Factory-fabricated companion flange assembly, for 150 psi or 300 psi minimum working pressure as required to suit system pressures.

E. Dielectric-Flange Kits:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

a. Advance Products & Systems, Inc.

b. Calpico, Inc.

c. Central Plastics Co.

d. Pipeline Seal and Insulator, Inc.

2. Companion-flange assembly for field assembly. Include flanges, full-face- or ring-type neoprene or phenolic gasket, phenolic or polyethylene bolt sleeves, phenolic washers, and steel backing washers.

3. Separate companion flanges and steel bolts and nuts shall have 150 psi or 300 psi minimum working pressure where required to suit system pressures.

F. Dielectric Couplings:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

a. Calpico, Inc.

b. Lochinvar Corp.

2. Galvanized-steel coupling with inert and noncorrosive, thermoplastic lining; threaded ends; and 300 psi minimum working pressures at 225 deg F.

G. Dielectric Nipples:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

a. Perfection Corp.

b. Precision Plumbing Products, Inc.

c. Sioux Chief Manufacturing Co., Inc.

d. Victaulic Co. of America.

2. Electroplated steel nipple with inert and noncorrosive, thermoplastic lining; plain, threaded, or grooved ends; and 300 psi minimum working pressure at 225 deg F.

2.5 VALVES

Provide Valves with ANSI/ASME Class 125 service rating, which for 150 degrees F, the pressure rating is 175 psig.

A. Gate Valves: Gate Valves 2-1/2 inches and smaller shall conform to MSS Sp-80 Class 125 and shall be bronze with wedge disc, rising stem and threaded, soldered, or flanged ends.

B. Globe and Angle: Globe and angle valves 2-1/2 inches and smaller shall conform to MSS SP-80, Class 125.

C. Check Valve: Check valves 2-1/2 inches and smaller shall conform to MSS SP-80.

D. Butterfly Valve: Butterfly valves shall conform to MSS SP-67, Type 1 and shall be either the wafer or lug type. Valves smaller than 8 inches shall have throttling handles with a minimum of seven locking positions.

E. Plug Valve: Plug valves 2-1/2 inches and larger shall conform to MSS SP-78, have flanged or threaded ends, and have cast iron bodies with bronze trim. Valves 2 inches and smaller shall be bronze with NPT connections for black steel pipe and brazed connections for copper tubing. Valve shall be lubricated, non-lubricated, or tetrafluoroethylene resin coated type. Valve shall be resilient, double seated, trunnion mounted with tapered lift plug capable of 2-way shutoff. Valve shall operate from fully open to fully closed by rotation of the handwheel to lift and turn the plug.

F. Ball Valve: Full port design. Ball valves ½ inch and larger shall conform to MSS SP-72 or MSS SP-110 and shall be bronze with threaded, soldered, or flanged ends. Ball valves may be used in lieu of gate valves.

G. Bronze, Calibrated-Orifice, Balancing Valves:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

a. Armstrong Pumps, Inc.

b. Bell & Gossett Domestic Pump

c. Griswold Controls.

d. Taco

2. Body: Bronze, ball or plug type with calibrated orifice or venturi.

3. Ball: Brass or stainless steel.

4. Plug: Resin.

5. Seat: Polytetrafluoroethylene (PTFE).

6. End connections: Threaded or socket.

7. Pressure Gage Connections: Integral seals for portable differential pressure meter.

8. Cold Water Pressure Rating: Minimum 125 psi.

9. Maximum Operating Temperature: 250 deg F.

10. Connecting Bolts and Nuts: Carbon steel with corrosion-resistant coating of length required to secure pressure plates to sealing elements. Include one for each sealing element.

H. Diaphragm-Operated, Pressure Reducing Valves:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

a. Amtrol, Inc.

b. Armstrong Pumps, Inc.

c. Bell & Gossett Domestic Pump

d. Conbraco Industries, Inc.

e. Watts Regulator Co.

2. Body: Bronze or brass.

3. Disc: Glass and carbon-filled polytetrafluoroethylene (PTFE).

4. Seat: Brass.

5. Stem Seals: EDPM O-rings.

6. Diaphragm: EPT.

7. Low inlet-pressure check valve.

8. Inlet Strainer: Removable without system shutdown.

9. Valve Seat and Stem: Noncorrosive.

10. Valve Size, Capacity and Operating Pressure: selected to suit system to which installed, with operating pressure and capacity factory set and field adjustable.

I. Diaphragm-Operated Safety Valves:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

a. Amtrol, Inc.

b. Armstrong Pumps, Inc.

c. Bell & Gossett Domestic Pump

d. Conbraco Industries, Inc.

e. Watts Regulator Co.

2. Body: Bronze or brass.

3. Disc: Glass and carbon-filled polytetrafluoroethylene (PTFE).

4. Seat: Brass.

5. Stem Seals: EDPM O-rings.

6. Diaphragm: EPT.

7. Wetted, Internal Working Parts: Brass and rubber.

8. Inlet Strainer: Removable without system shutdown.

9. Valve Seat and Stem: Noncorrosive.

10. Valve Size, Capacity and Operating Pressure: Comply with ASME Boiler and Pressure Vessel Code: Section IV, and selected to suit system in which installed, with operating pressure and capacity factory set and field adjustable.

2.6 AIR CONTROL DEVICES

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into Work include, but are not limited to, the following:

1. Amtrol, Inc.

2. Armstrong Pumps, Inc.

3. Bell & Gossett Domestic Pump.

4. Taco.

B. Manual Air Vents:

1. Body: Bronze.

2. Internal Parts: Nonferrous.

3. Operator: Screwdriver or thumbscrew.

4. Inlet Connection: ¾ inch

5. Discharge Connection: 1/4 inch

6. Cold Water Pressure Rating: 150 psi.

7. Maximum Operating Temperature: 225 deg F.

C. Automatic Air Vents:

1. Body: Bronze.

2. Internal Parts: Nonferrous.

3. Operator: Screwdriver or thumbscrew.

4. Inlet Connection: ¾ inch

5. Discharge Connection: 1/4 inch

6. Cold Water Pressure Rating: 150 psi.

7. Maximum Operating Temperature: 225 deg F.

D. Diaphragm-Type Expansion Tanks

1. Tank: Welded steel, rated for 125 psi working pressure and 375 deg F maximum operating temperature. Tanks shall be factory tested with taps fabricated and labeled according to ASME Boiler and Pressure Vessel Code: Section VIII, Division 1.

2. Diaphragm: Securely sealed into tank to separate air charge from system water to maintain required expansion capacity.

3. Air-Charge Fittings: Schrader valve, stainless steel with EDPM seats.

E. Tangential Air Separators:

1. Tank: Welded steel; ASME constructed and labeled for 125 psi minimum working pressure and 375 deg F maximum operating temperature.

2. Air Collector Tube: Perforated stainless steel, construction to direct released air into expansion tank.

3. Tangential Inlet and Outlet Connection: Threaded for 2 inches and smaller; flanged connection for 2-1/2 inches and larger.

4. Blowdown Connection: Threaded.

5. Size: Match system flow capacity

2.7 CHEMICAL TREATMENT

A. Bypass Chemical Feeder: Welded steel construction; 225 psi working pressure; 5 gallon capacity; with funnel inlet, outlet and drain valves.

1. Chemicals: Specially formulated, based on analysis of make-up water, to prevent accumulation of scale and corrosion in piping and connected equipment.

2.8 HYDRONIC SPECIALTIES

A. Y-Pattern Strainers

1. Body: ASTM A 126, Class B, bronze with bolted cover and bottom drain connection.

2. End Connections: Threaded ends for 2 inches and smaller; flanged ends for 2-1/2 inches and larger.

3. Strainer screen: 40 mesh startup strainer and perforated stainless-steel basket with 50 percent free area.

4. Cold Water Pressure Rating: 150 psi.

B. Basket Strainers

1. Body: ASTM A 126, Class B, high-tensile cast iron with bolted cover and bottom drain connection.

2. End Connections: Threaded ends for 2 inches and smaller; flanged ends for 2-1/2 inches and larger.

3. Strainer screen: 40 mesh startup strainer and perforated stainless-steel basket with 50 percent free area.

4. Cold Water Pressure Rating: 150 psi.

C. Stainless Steel Bellow, Flexible Connectors:

1. Body: Stainless steel bellows with woven, flexible, bronze, wire-reinforcing protective jacket.

2. End Connections: Threaded or flanged to match equipment connected.

3. Performance: Capable of ¾ inch misalignment.

4. Cold Water Pressure Rating: 150 psi.

5. Maximum Operating Temperature: 250 deg F.

PART 3

EXECUTION

3.1 PIPING APPLICATIONS

A. Hot and chilled water piping, aboveground, 2 inches and smaller, shall be:

1. Type L, drawn-temper copper tubing, wrought copper fittings, and soldered joints.

B. Solar collector piping.

1. Type L, drawn-temper copper tubing, wrought copper fittings, and soldered joints.

C. Condenser-water piping, aboveground, 2 inches and smaller shall be any of the following:

1. Type L, drawn-temper copper tubing, wrought copper fittings, and soldered joints.

2. High density polyethylene pipe (HPDE) PE3408, DR 11, with heat fused butt or socket fittings.

D. Condenser-water piping, aboveground, 3 inches and larger shall be:

1. High density polyethylene pipe (HPDE) PE3408, DR 15.5 or Schedule 40, with heat fused butt or socket fittings.

E. Makeup water piping installed above ground shall be one of the following:

1. Type B, drawn-temper copper tubing, wrought-copper fittings, and soldered joints.

2. Schedule 40 CPVC plastic pipe and fittings, and solvent-welded joints.

F. Condensate Drain Piping: Type L, drawn-temper copper tubing, wrought-copper fittings, and soldered joints.

G. Air-vent Piping:

1. Inlet: Same as service where installed according to the piping manufacturer’s written instructions.

2. Outlet: Annealed-temper copper tubing with soldered or flared joints.

H. Safety-Valve Inlet and outlet piping for Hot Water Piping: Same materials and joining methods as for piping specified for the service in which safety valve is installed according to the piping manufacturer’s written instructions.

3.2 RADIANT FLOOR SYSTEM INSTALLATION

A. Install system per manufacturer’s instructions and the Radiant Panel Association, “RPA Guidelines 2007 Edition.”

B. The floor tubing shall be positioned not more than 1-1/2 inch nor less than ½ inch below the finished slab surface.

C. Locate manifolds in interior wall framing near zone being served. Locate in areas that are accessible for servicing.

D. For slab-on-grade installations, vertical slab edge insulation shall be R-10, and horizontal insulation under slab shall be R-7 with vapour/radon barrier.

E. Pressure Testing: Floor tubing shall be pressurized to 50 psi for 24 hours, then, re-pressurized to 50 psi to compensate for initial tubing expansion during concrete pour. Test four hours with 2 psi maximum pressure loss before covering. Floor tubing to be buried in concrete shall be pressure tested during concrete pour to identify damage to tubing during the pouring of concrete.

F. Tubing which is scored or otherwise visibly damaged shall not be installed. If tubing is ruptured during concrete pour, cut out faulty section, move cut end to nearest wall location, and join them using insert or compression fittings. Install a cover plate for future access.

G. Notify Owner when tubing installation is complete, before concrete is poured, to witness pressure tested installation.

H. Piping loops shall be continuous with no pipe joints in the slab.

3.3 VALVE APPLICATIONS

A. Install shutoff duty valves at each branch connection to supply mains and at supply connection to each piece of equipment.

B. Install throttling duty valves at each branch connection to return main.

C. Install calibrated-orifice, balancing valves in the return pipe of each heating or cooling terminal D. Install check valves at each pump discharge and elsewhere as required to control flow direction.

E. Install safety valves at hot water generators and elsewhere as required by ASME Boiler and Pressure Vessel Code. Install trip-pan elbow on safety-valve outlet and pipe without valves to outdoors; and pipe drain to nearest floor drain or as indicated on Drawings. Comply with ASME Boiler and Pressure Vessel Code: Section VIII, Division 1, for installation requirements.

F. Install pressure-reducing valves at makeup water connection to regulate system fill pressure.

3.4 PIPING INSTALLATIONS

A. Drawing plans, schematics, and diagrams indicate general location and arrangement of piping systems. Indicate piping locations and arrangements if such were used to size pipe and calculate friction loss, expansion, pump sizing, and other design considerations. Install piping as indicated unless deviation to layout is approved on Coordination Drawings.

B. Install piping in concealed locations, unless otherwise indicated and except in equipment rooms and service areas.

C. Install piping indicated to be exposed and piping in equipment rooms and service areas at right angles or parallel to building walls. Diagonal runs are prohibited unless specifically indicated otherwise.

D. Install piping above accessible ceilings to allow sufficient space for ceiling panel removal.

E. Install piping to permit valve servicing.

F. Install piping at indicated slopes.

G. Install piping free of sags and bends.

H. Install fittings for changes in direction and branch connections.

I. Install piping to allow application of insulation.

J. Select system components with pressure rating equal to or greater than system operating pressure.

K. Install groups of pipes parallel to each other, spaced to permit applying insulation and servicing of valves.

L. Install drains, consisting of a tee fitting, ¾ inch ball valve, and short ¾ inch threaded nipple with cap, at low points in piping system mains and elsewhere as required for system drainage. Slope all piping loops to drain and install air vents at all high points.

M. Install piping at a uniform grade of 0.2 percent upward in direction of flow.

N. Reduce pipe sizes using eccentric reducer fitting installed with level side up.

O. Install branch connections to mains using mechanically formed tee fittings in main pipe, with the branch connected to the bottom of the main pipe. For up-fee risers, connect the branch to the top of the main.

P. Install unions in piping, 2 inches and smaller, adjacent to valves, at final connections of equipment, and elsewhere as indicated.

Q. Install flanges in piping, 2-1/2 inches and larger, at final connections of equipment and elsewhere as indicated.

R. Install strainers on inlet side of each control valve, pressure reducing valve, solenoid valve, in-line pump, and elsewhere as indicated. Install ¾ inch nipple and ball valve in blowdown connection of strainers 2 inches and larger. Match size of strainer blow off connection for strainers smaller than 2 inches.

S. Install expansion loops, expansion joints, anchors, and pipe alignment guides as required.

T. Install isolation valves on both sides of all pumps.

3.5 HANGERS AND SUPPORTS

A. Hanger, support and anchor devices are specified in Division 15 Section “Supports and Anchors.”

B. Install the following pipe attachments:

1. Adjustable steel clevis hangers for individual horizontal piping less than 20 feet long.

2. Adjustable roller hangers and spring hangers for individual horizontal piping 20 feet or longer.

3. Pipe Roller: MSS SP-58, Type 44 for multiple horizontal piping 20 feet or longer, supported on a trapeze.

4. Spring hangers to support vertical runs.

5. Provide copper-clad hangers and supports for hangers and supports in direct contact with copper pipe.

C. Install hangers for drawn-temper copper piping with the following maximum spacing and minimum rod sizes.

1. ¾ inch: Maximum span 5 feet; minimum rod size1/4 inch.

2. 1 inch: Maximum span 6 feet; minimum rod size ¼ inch.

3. 1-1/2 inch: Maximum pan 8 feet; minimum rod size 3/8 inch.

4. 2 inches: Maximum span 8 feet; minimum rod size 3/8 inch.

5. 2-1/2 inches: Maximum span 9 feet; minimum rod size 3/8 inch.

6. 3 inches: Maximum span 10 feet; minimum rod size 3/8 inch.

D. Support vertical runs at roof, at each floor, and at 10 foot intervals between floors.

3.6 PIPE JOINT CONSTRUCTION

A. Join pipe and fittings according to the following requirements and Division 15 Sections specifying piping systems.

B. Ream ends of pipes and tubes and remove burrs. Bevel plain ends of steel pipe.

C. Remove scale, slag, dirt and debris from inside and outside of pipe and fittings before assembly.

D. Soldered Joints: Apply ASTM B 813, water-flushable flux, unless otherwise indicated to tube end. Construct joints according to ASTM B 828 or CDA’s “Copper Tube Handbook,” using lead-free solder alloy complying with ASTM B32.

E. Brazed Joints: Construct joints according to AWS’s “Brazing Handbook,” “Pipe and Tube” Chapter using copper-phosphorus brazing filler metal complying with AWS A5.8.

F. Threaded joints: thread pipe with tapered pie threads according to ASME B1.20.1. Cut threads full and clean using sharp dies. Ream threaded pipe ends to remove burrs and restore full ID. Join pipe fittings an valves as follows:

1. Apply appropriate tape or thread compound to external pipe threads unless dry seal threading is specified.

2. Damaged Threads: Do not use pipe or pipe fittings with threads that are corroded or damaged. Do not use pipe section that have cracked or open welds.

G. Welded Joints: Construction joints according to AWS D10.12, using qualified processes and welding operators according to Part 1,”Quality Assurance” Article.

H. Flanged Joints: Select appropriate gasket material, size, type, and thickness for service application. Install gasket concentrically positioned. Use suitable lubricants on bolt threads.

I. PE Piping Heat-Fusion Joints: Clean and dry joining surfaces by wiping with clean cloth or paper towels. Join according to ASTM D 2657.

1. Plain-End Pipe and Fittings: Use butt fusion.

2. Plain-End Pipe and Socket Fittings: Use socket fusion.

3.7 HYDRONIC SPECIALTIES INSTALLATION

A. Install manual air vents at high points in piping, at heat transfer coils, and elsewhere as required for system air venting.

B. Install automatic air vents at high points of system piping in mechanical equipment rooms only.

C. Install piping from hot water heater outlet, air separator or air purger to expansion tank with a 2 percent upward slope.

D. Install tangential air separator in pump suction. Install blowdown pipng with gate or full-port ball valve; extend full size to nearest floor drain.

E. Install diaphragm expansion tanks on the floor. Vent and purge air from hydronic system and ensure tank is proper charged with air to suit system Project requirements.

F. Install drain, fill, and repressurization valves and connections at each piping loop.

3.8 TERMINAL EQUIPMENT CONNECTIONS

A. Sizes for supply and return piping connections shall be the same as or larger than equipment connections.

B. Install control valves in accessible locations close to connected equipment.

C. Install bypass piping with globe valve around control valve. If parallel control valves are installed, only one bypass is required.

D. Install ports for pressure gages and thermometers at coil inlet and outlet connections.

3.9 CHEMICAL TREATMENT

A. Perform an analysis of makeup water to determine type and quantities of chemical treatment needed to keep system free of scale, corrosion, and fouling, and to sustain the following water characteristics.

1. pH: 9.0 to 10.5

2. “P” Alkalinity: 100 to 500 ppm.

3. Boron: 100 to 200 ppm.

4. Chemical Oxygen Demand: Maximum 100 ppm.

5. Corrosion Inhibitor:

a. Sodium Nitrate: 1000 to 1500 ppm

b. Molybdate: 200 to 300 ppm

c. Chromate: 200 to 300 ppm

d. Sodium Nitrate Plus Molybdate: 100 to 200 ppm each.

e. Chromate Plus Molybdate: 50 to 100 ppm each.

6. Soluble Copper: Maximum 0.20 ppm.

7. Tolyiriazole Copper and Yellow Metal Corrosion Inhibitor: Minimum 10 ppm.

8. Total Suspended Solids: Maximum 10 ppm.

9. Ammonia: Maximum 20 ppm.

10. Free Caustic Alkalinity: Maximum 20 ppm.

11. Microbiological Limits:

a. Total Aerobic Plate Count: Maximum 1000 organisms/ml.

b. Total Anaerobic Plate Count: Maximum 100 organisms/ml.

c. Nitrate Reducers: 100 organisms/ml.

d. Sulfate Reducers: Maximum 0 organisms/ml.

e. Iron Bacteria: Maximum 0 organisms/ml.

B. Fill system with fresh water and add liquid alkaline compound with emulsifying agents and detergents to remove grease and petroleum products from piping. Circulate solution for a minimum of 24 hours, drain, clean strainer screens, and refill with fresh water.

C. Add initial chemical treatment and maintain qualify in ranges noted above the first year of operation.

3.10 FIELD QUALITY CONTROL

A. Prepare hydronic piping according to ASME B31.9 and as follows:

1. Leave joints, including welds, uninsulated and exposed for examination during test.

2. Provide temporary restraints for expansion joints that cannot sustain reactions due to test pressure. If temporary restraints are impractical, isolate expansion joints from testing.

3. Flush hydronic piping system with clean water; then remove and clean or replace strainer screens.

4. Isolate equipment from piping. If a valve is used to isolate equipment, its closure shall be capable of sealing against test pressure without damage to the valve. Install blinds in flanged joints to isolate equipment.

5. Install safety valve, set at pressure no more than one-third higher than test pressure, to protect against damage by expanding liquid or other source of overpressure during test.

B. Perform the following tests on hydronic piping:

1. Use ambient temperature water as a testing medium.

2. While filling system, use vents installed at high points of system to release air. Use drains installed at low points for complete draining of test liquid.

3. Isolate expansion tanks and determine that hydronic system is full of water.

4. Subject piping system to hydrostatic test pressure that is not less than 1.5 times the system’s working pressure. Test pressure shall not exceed maximum pressure for any vessel, pump, valve, or other component in system under test. Verify that stress due to pressure at bottom of vertical runs does not exceed ninety percent of specified yield strength or 1.7 times “SE” value in Appendix A in ASME M31.9, “Building Services Piping.”

5. After hydrostatic test pressure has been applied for at least 10 minutes, examine piping joints, and connections for leakage. Eliminate by tightening, repairing, or replacing components and repeat hydrostatic test until there are no leaks.

6. Prepare written report of testing.

C. Perform the following before operating the system.

1. Open manual valves fully.

2. Inspect pumps for proper rotation.

3. Set makeup pressure-reducing valves for required system pressure.

4. Inspect air vents at high points of system and determine if all are installed and operating freely (automatic type), or bleed air completely (manual type).

5. Set temperature controls so all coils are calling for full flow.

6. Inspect and set operating temperatures of hydronic equipment, such as heat pumps, to specified values.

7. Verify lubrication of motors and bearings.

D. Pre-insulated underground piping shall be installed in accordance with manufacturer’s recommendations. An authorized manufacturer’s representative shall approve all installations.

END OF SECTION

8/30/2019

HYDRONIC PIPING

SECTION 23 21 13 Page 16