Steam and Condensate Heating PipingME- Building Group

SECTION 232213 - STEAM AND CONDENSATE HEATING PIPING

PART 1 - GENERAL

1.1RELATED DOCUMENTS

  1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division01 Specification Sections, apply to this Section.

1.2SUMMARY

  1. This Section includes steam and condensate piping and specialties for systems up to 125 psig, inside the building.
  2. Related Sections include the following:
  3. Division23 Section "Common Work Results for HVAC" for general piping materials and installation requirements.
  4. Division23 Section "Hangers and Supports and Supports for HVAC Piping and Equipment" for pipe supports, product descriptions, and installation requirements. Hanger and support spacing is specified in this Section.
  5. Division23 Section "General-Duty Valves for HVAC Piping" for general-duty gate, globe, ball, butterfly, and check valves.
  6. Division23 Section "Meters and Gages for HVAC Piping" for thermometers, and pressure and vacuum gages.
  7. Division23 Section "Instrumentation and Controls for HVAC" for temperature-control valves and sensors.

1.3DEFINITIONS

  1. HP Systems: High-pressure systems operating at 15psig or more as required by ASMEB31.1.
  2. LP Systems: Low-pressure systems operating at less than 15psigas required by ASMEB31.9.

1.4SYSTEM DESCRIPTION

  1. Steam and condensate piping if used shall be a two-pipe, mechanical flow system.

1.5SUBMITTALS

  1. Product Data: For each type of special-duty valve and steam trap indicated, including rated capacities and accessories.
  2. Shop Drawings:
  3. Detail fabrication of pipe anchors, hangers, special pipe support assemblies, alignment guides, and expansion loops and their attachment to the building structure. Include dimensions, weights, loadings, required clearances, method of field assembly, components, and location and size of each field connection.
  4. Welding Certificates: Copies of certificates for welding procedures and personnel.
  5. Maintenance Data: For steam traps and vacuum breakers to include in maintenance manuals specified in Division1.

1.6QUALITY ASSURANCE

  1. Welding: Qualify processes and operators according to the ASME Boiler and Pressure Vessel Code: SectionIX, "Welding and Brazing Qualifications."
  2. ASME Compliance: Comply with ASMEB31.9, "Building Services Piping," for materials, products, and installation. Safety valves and pressure vessels shall bear the appropriate ASME label.

1.7COORDINATION

  1. Coordinate layout and installation of steam and condensate piping and suspension system components with other construction, including light fixtures, hydronic piping, fire-suppression-system components, and partition assemblies.
  2. Coordinate pipe fitting pressure classes with products specified in related Sections.
  3. Coordinate installation of pipe sleeves for penetrations through walls and floor assemblies. Coordinate with requirements for firestopping specified in Division7 Section "Penetration Firestopping" for fire and smoke wall and floor assemblies.
  4. Coordinate installation of pipe sleeves for penetrations through exterior walls and floor assemblies. Coordinate with requirements for firestopping specified in Division7 Section "Penetration Firestopping" for fire and smoke wall and floor assemblies.

PART 2 - PRODUCTS

2.1MANUFACTURERS

  1. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  2. Safety Valves:
  3. Armstrong International, Inc.
  4. Kunkle Inds. Inc.; Kunkle Valve Division.
  5. Spirax Sarco, Inc.
  6. Watts Industries, Inc.; Watts Regulators.
  7. Pressure-Reducing Valves:
  8. Armstrong International, Inc.
  9. ITT Hoffman; ITT Fluid Technology Corp.
  10. Leslie Controls, Inc.
  11. Spence Engineering Company, Inc.
  12. Spirax Sarco, Inc.
  13. Steam Traps:
  14. Armstrong International, Inc.
  15. Barnes & Jones, Inc.
  16. Dunham-Bush, Inc.
  17. ITT Hoffman; ITT Fluid Technology Corp.
  18. Spirax Sarco, Inc.
  19. Sterling, Inc.
  20. Air Vents and Vacuum Breakers:
  21. Armstrong International, Inc.
  22. Barnes & Jones, Inc.
  23. ITT Hoffman; ITT Fluid Technology Corp.
  24. Johnson Corp. (The).
  25. Spirax Sarco, Inc.

2.2PIPING MATERIALS

  1. General: Refer to Part3 piping application articles for applications of pipe and fitting materials.

2.3STEEL PIPE AND FITTINGS

  1. Steel Pipe, NPS1-1/2-Inch and Smaller: ASTMA53 or A-106, TypeS (seamless), GradeB, Schedules80, black steel, plain ends.
  2. Steel Pipe, NPS2-Inch through NPS 12: ASTMA53 or A-106, TypeE (electric-resistance welded), GradeB, Schedules40 (for steam), schedule 80 (for condensate), black steel, plain ends. Use heavy weight welding rings at pipe joints 6-Inch and larger.
  3. Steel Pipe, NPS14 and larger: ASTMA53, TypeE (electric-resistance welded) or TypeS (seamless), GradeB, Schedule30, black steel, plain ends.
  4. Steel Pipe Nipples: ASTMA733, made of ASTMA53, Schedules40 (for steam) and 80 (for condensate), black steel; seamless for NPS2 and smaller and electric-resistance welded for NPS2-1/2 and larger.
  5. Cast-Iron Threaded Fittings: ASMEB16.4; Class 300.
  6. Malleable-Iron Threaded Fittings: ASMEB16.3; Class 300.
  7. Malleable-Iron Unions: ASMEB16.39; Class 300.
  8. Cast-Iron Threaded Flanges and Flanged Fittings: ASMEB16.1, Class 250; raised ground face, and bolt holes spot faced.
  9. Wrought-Steel Fittings: ASTMA234/A234M, wall thickness to match adjoining pipe.
  10. Wrought-Steel Flanges and Flanged Fittings: ASMEB16.5, including bolts, nuts, and gaskets of the following material group, end connections, and facings:
  11. Material Group: 1.1.
  12. End Connections: Butt welding.
  13. Facings: Raised face.
  14. Flexible Connectors: Stainless-steel bellows with woven, flexible, bronze, wire-reinforcing protective jacket; 150-psig minimum working pressure and 250degF maximum operating temperature. Connectors shall have flanged or threaded-end connections to match equipment connected and shall be capable of 3/4-inch misalignment.
  15. Welding Materials: Comply with SectionII, PartC, of the ASME Boiler and Pressure Vessel Code for welding materials appropriate for wall thickness and for chemical analysis of pipe being welded.
  16. Gasket Material: Thickness, material, and type suitable for fluid to be handled; and design temperatures and pressures.

2.4VALVES

  1. Gate, globe, check, ball, and butterfly valves are specified in Division23 Section "General-Duty Valves for HVAC Piping."

2.5SAFETY VALVES

  1. Size and Capacity: As required for equipment according to the ASME Boiler and Pressure Vessel Code.
  2. Bronze Safety Valves: Class250, with threaded inlet and outlet; forged copper-alloy disc; fully enclosed steel spring with adjustable pressure range and positive shutoff; factory set and sealed.
  3. Drip Pan Elbow: Cast iron and having threaded inlet and outlet with threads complying with ASME B1.20.1.
  4. Cast-Iron Safety Valves: Class250; forged copper-alloy disc with bronze nozzle; fully enclosed, cadmium-plated steel spring with adjustable pressure range and positive shutoff; raised-face flanged inlet and threaded outlet connections; factory set and sealed.
  5. Drip-Pan Elbow: Cast iron and having threaded inlet and outlet with threads complying with ASMEB1.20.1.
  6. Stop-Check Valves: Class250, malleable-iron body and bonnet, cylindrical disc, removable liner and machined seat, brass-alloy stem, outside screw and yoke, polytetrafluoroethylene-impregnated packing with 2-piece packing gland assembly, flanged end connections, and cast-iron handwheel.

2.6PRESSURE-REDUCING VALVES

  1. Size, Capacity, and Pressure Rating: Factory set for inlet and outlet pressures indicated.
  2. Valve Characteristics: Pilot-actuated, diaphragm type, with adjustable pressure range and positive shutoff. Valves shall have cast-iron body with threaded connections for valves NPS2and smaller and flanged connections for valves NPS2-1/2and larger; and hardened stainless-steel trim, replaceable head and seat, main head stem guide fitted with flushing and pressure-arresting device, cover over pilot diaphragm, and non-asbestos gaskets.

2.7STEAM TRAPS

  1. Float and Thermostatic Type, 300 psi WSP: Provide float and thermostatic steam traps with semi-steel or cast iron body with internal working parts constructed of stainless steel, 125 psi WSP. Select traps with capacities for each control valve at twice the maximum condensing rate, trap connection pipe sizes of not less than 3/4 inch, and capacities rated on a 2 psi pressure differential.
  2. Size and Rating

Trap SizePounds/Hour

3/4 inch200

1 inch500

1-1/4 inch1,200

1-1/2 inch2,400

2 inch5,000

  1. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  2. Spirax Sarco, Inc.
  3. Armstrong
  4. Nicholson Steam Trap, Inc.
  5. Leslie
  6. Webster
  1. Inverted Bucket Type, 300 psi WSP: Provide inverted bucket type steam traps, 300 psi WSP, with standard trim. Select trap capacities at a suitable differential and with three times the maximum condensing rate of the equipment or piping to be drained.
  2. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  3. Armstrong Series 800
  4. Spirax Sarco, Inc.
  5. Webster

2.8STRAINERS

  1. "Y" Type: Screwed, bronze for sizes 2 inch and smaller, and flanged, high-grade cast iron for steam and condensate service for sizes 2-1/2 inch and larger, 250 psi WSP, equipped with an easily removable cover and stainless steel screen suitable for the service intended with a net free area at least four times that of the entering pipe, with perforations of 1/16 inch for strainers 2 inch and smaller, and 1/8 inch for strainers 2-1/2 inch and larger. Provide valved blow-off for each flanged strainer.
  2. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  3. Tate Andale
  4. Spirax Sarco, Inc., Series BT and Series CI and F
  5. Boylston
  6. Dunham
  7. Nicholson Steam Trap, Inc.
  8. Armstrong
  9. Keckley
  10. Mueller Steam Specialty Co.
  11. Hayward

2.9STEAM FLASHING DEVICES

  1. Flash Tanks: Provide flash tank assembly, consisting of 150 psi ASME rated and labeled tank mounted on a pipe stand, with bucket trap and combination float and thermostatic trap, together with pipe, fittings and valves, and with safety valve set at 15 psi. High pressure condensate shall pass through the flash tank prior to entering the gravity, low pressure condensate return. Discharge steam generated in the flash tank into the relief vent line or low pressure steam main.
  2. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  3. Chicago Boiler Co.
  4. Buffalo Tank Co-
  5. Flash Leg: Provide flash leg assembly, consisting of an enlarged section of pipe with capped piping connections as detailed, mounted on a pipe stand, with float trap and combination float and thermostatic trap together with pipe, fittings and valves, and with safety valve set at 15 psi. High pressure condensate shall pass through the flash leg prior to entering the gravity, low pressure condensate return. Discharge steam generated in the flash leg into the relief vent line or low pressure steam main.

2.10THERMOSTATIC AIR VENTS

  1. Quick Vents: Cast-iron or brass body, with balanced-pressure, stainless-steel or monel thermostatic bellows and stainless-steel heads and seats. Thermostatic air vent capable of withstanding 45degF of superheat and resisting water hammer without sustaining damage.
  2. Float Vents: Cast-iron or brass body, seamless brass float, balanced-pressure thermostatic bellows, and replaceable stainless-steel seat, float, and head.

2.11VACUUM BREAKERS

  1. Vacuum Breakers: 150-psig steam working pressure, 365 degF maximum operating temperature, brass or stainless-steel body, and stainless-steel retainer, spring, and ball; with plain or threaded outlet.

PART 3 - EXECUTION

3.1STEAM PIPING APPLICATIONS

  1. Steam Piping, NPS2 and Smaller: Schedule80 steel pipe, with threaded joints using Class300 malleable-iron fittings.
  2. Steam Piping, NPS2-1/2 through NPS12 Schedule40 steel pipe, with welded joints using Schedule40 wrought-steel welding fittings and Class150 wrought-steel flanges.
  3. Steam Piping, NPS14 through NPS18 Schedule30 steel pipe, with welded joints using Schedule30 wrought-steel welding fittings and Class150 wrought-steel flanges.
  4. Condensate Piping, NPS2 and Smaller: Schedule80 steel pipe, with threaded joints using Class300 malleable-iron fittings.
  5. Condensate Piping, NPS2-1/2 through NPS12 Schedule80 steel pipe, with welded joints using Schedule80 wrought-steel welding fittings and Class150 wrought-steel flanges.

3.2VALVE APPLICATIONS

  1. General-Duty Valve Applications: Unless otherwise indicated, use the following valve types:
  2. Shutoff Duty: Gate valves.
  3. Install shutoff-duty valves at each branch connection to supply mains, at inlet connection to each steam trap, and elsewhere as indicated.

3.3LP STEAM-TRAP APPLICATIONS

  1. Float and Thermostatic Traps: Install on the return side of equipment and coils utilizing steam, at the end of steam mains, at low points in steam piping systems, and where indicated or required, installed with gate valve and “Y” strainer on the upstream side.

3.4HP STEAM-TRAP APPLICATIONS

  1. Inverted Bucket Traps: Install on the return side of equipment utilizing steam, at the end of steam mains, at low points in steam piping systems, and where indicated or required, installed with gate valve and “Y” strainer on the upstream side.
  2. Float and Thermostatic Traps: Kitchen equipment, heat exchangers, and heating coils.

3.5PIPING INSTALLATIONS

  1. Refer to Division23 Section "Common Work Results for HVAC" for basic piping installation requirements.
  2. Install groups of pipes parallel to each other, spaced to permit applying insulation and servicing of valves.
  3. Install drains, consisting of a tee fitting, NPS3/4 ball valve, and short NPS3/4 threaded nipple with cap, at low points in piping system mains and elsewhere as required for system drainage.
  4. Install steam supply piping at a uniform grade of 0.2 percent downward in direction of steam flow.
  5. Install condensate return piping at a uniform grade of 0.4 percent downward in direction of condensate flow. Coordinate with the installation of ductwork and other above-ceiling materials.
  6. Reduce pipe sizes using eccentric reducer fitting installed with level side down.
  7. Unless otherwise indicated, install branch connections to steam mains using 45-degree fittings in main pipe, with the takeoff coming out the top of the main pipe. Use of 90-degree tee fittings is permissible if 45-degree fittings are impractical. If length of branch takeoff is less than 10feet, pitch branch line down toward mains at a 0.4 percent grade.
  8. Install unions in piping NPS2 and smaller adjacent to each valve, at final connections of each piece of equipment, and elsewhere as indicated.
  9. Install flanges in piping NPS2-1/2 and larger at final connections of each piece of equipment and elsewhere as indicated.
  10. Install strainers on supply side of each control valve, pressure-reducing valve, traps, and elsewhere as indicated. Install NPS3/4 nipple and ball valve in blowdown connection of strainers NPS2 and larger. Match size of strainer blowoff connection for strainers smaller than NPS2.
  11. Anchor piping for proper direction of expansion and contraction.
  12. Install drip legs at low points and natural drainage points such as ends of mains, bottoms of risers, and ahead of pressure regulators, control valves, isolation valves, pipe bends, and expansion joints. Coordinate mounting height of air handling units to allow for installation of drip legs at steam coil condensate connections.
  13. On straight runs with no natural drainage points, install drip legs at intervals not exceeding 300 feet where pipe is pitched down in direction of steam flow and a maximum of 150 feet where pipe is pitched up in direction of steam flow.
  14. Size drip legs at vertical risers same size as pipe and extend beyond rise. Size drip legs at other locations same diameter as main.
  15. Install gate valve at drip legs, dirt pockets, and strainer blowdowns to allow removal of dirt and scale.
  16. Install steam traps close to drip legs.
  17. Pitch condensate piping down toward flash tank. If more than one condensate pipe discharges into flash tank, install a swing check valve in each line. Install thermostatic air vent at top of tank. Install inverted bucket or float and thermostatic trap at low-pressure condensate outlet,

3.6STEAM-TRAP INSTALLATION

  1. Install steam traps in accessible locations as close as possible to connected equipment, but not more than 48inches from connected equipment.
  2. Unless otherwise indicated, install gate valve, strainer, and union upstream from trap; install union, check valve, and gate valve downstream from trap.

3.7PRESSURE-REDUCING VALVE INSTALLATION

  1. Install pressure-reducing valves in readily accessible location for maintenance and inspection.
  2. Install bypass piping around each pressure-reducing valve, with globe valve equal in size to area of pressure-reducing valve seat ring, unless otherwise indicated.
  3. Install gate valves around each pressure-reducing valve.
  4. Install unions around each pressure-reducing valve having threaded-end connections.
  5. Install pressure gages on low-pressure side of each pressure-reducing valve and ahead of shutoff valve. Install pressure gages downstream from globe valve on pressure-reducing valve bypass.
  6. On two-stage pressure-reducing stations, install drip trap and pressure gage upstream from second stage pressure-reducing valve.
  7. Install strainers upstream for each pressure-reducing valve.
  8. Install safety valves downstream from each pressure-reducing valve station.

3.8VACUUM BREAKER

  1. Install vacuum breakers at highest point of system and install a safety shutoff valve on the pressure/vacuum side and provide a full size vent pipe to the nearest blowdown or approved drain.

3.9SAFETY VALVE INSTALLATIONS

  1. Install safety valves according to ASMEB31.1. Pipe safety valve discharge without valves to atmosphere outside building. Install drip-pan elbow fitting adjacent to safety valve and pipe drain connection to nearest floor drain.

3.10HANGERS AND SUPPORTS

  1. Hanger, support, and anchor devices are specified in Division23 Section "Hangers and Supports for HVAC Piping and Equipment."
  2. Install the following pipe attachments:
  3. Adjustable steel clevis hangers for individual horizontal piping less than 20feet long.
  4. Adjustable roller hangers and spring hangers for individual horizontal piping 20feet or longer.
  5. Pipe Roller: MSSSP-58, Type44 for multiple horizontal piping 20feet or longer, supported on a trapeze.
  6. Spring hangers to support vertical runs.
  7. Install hangers with the following maximum spacing and minimum rod sizes:
  8. NPS3/4: Maximum span, 9feet, minimum rod size, 1/4inch.
  9. NPS1: Maximum span, 9feet; minimum rod size, 1/4inch.
  10. NPS1-1/2: Maximum span, 12 feet; minimum rod size, 3/8inch.
  11. NPS2: Maximum span, 13feet; minimum rod size, 3/8inch.
  12. NPS2-1/2: Maximum span, 14feet; minimum rod size, 3/8inch.
  13. NPS3: Maximum span, 15feet; minimum rod size, 3/8inch.
  14. NPS4: Maximum span, 17feet; minimum rod size, 1/2inch.
  15. NPS6: Maximum span, 21feet; minimum rod size, 1/2inch.
  16. NPS8: Maximum span, 24feet; minimum rod size, 5/8inch.
  17. NPS10: Maximum span, 26feet; minimum rod size, 3/4inch.
  18. NPS12: Maximum span, 30feet; minimum rod size, 7/8inch.
  19. NPS14: Maximum span, 32feet; minimum rod size, 1inch.
  20. NPS16: Maximum span, 35feet; minimum rod size, 1inch.
  21. NPS18: Maximum span, 37feet; minimum rod size, 1-1/4inches.
  22. Support vertical runs at roof, at each floor, and at 10-foot intervals between floors.

3.11PIPE JOINT CONSTRUCTION