23 21 11-Boiler Plant Piping - Edited.pdf

12-01-25

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SECTION 23 21 11

BOILER PLANT PIPING SYSTEMS

PART 1 - GENERAL

1.1 DESCRIPTION

A. All boiler plant piping systems, except plumbing and sanitary, including piping supports. Piping located outside of the boiler plant building is not included except for gas regulator and meter stations.

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS.

B. Section 09 91 00, PAINTING.

C. Section 23 05 10, COMMON WORK RESULTS FOR BOILER PLANT AND STEAM

GENERATION.

D. Section 23 05 51, NOISE AND VIBRATION CONTROL FOR BOILER PLANT.

E. Section 23 08 11, DEMONSTRATIONS AND TESTS FOR BOILER PLANT.

F. Section 23 09 11, INSTRUMENTATION AND CONTROL FOR BOILER PLANT.

G. Section 23 52 33, WATER-TUBE BOILERS.

1.3 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only. Where conflicts occur these specifications and the VHA standards will govern.

B. American Society of Mechanical Engineers (ASME):

B16.3-2016..............Malleable Iron Threaded Fittings: Classes 150 and 300

B16.5-2020..............Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard

B16.9-2018..............Factory Made Wrought Buttwelding Fittings

B16.11-2016.............Forged Fittings, Socket-Welding and Threaded

B16.22-2018.............Wrought Copper and Copper Alloy Solder-Joint

Pressure Fittings

B16.34-2020.............Valves Flanged, Threaded and Welding End

B31.1-2020..............Power Piping

B31.9-2020..............Building Services Piping

ASME Boiler and Pressure Vessel Code (BPVC):

BPVC Section I-2021.....Rules for Construction of Power Boilers

BPVC Section VIII-2021 Rules for Construction of Pressure Vessels

BPVC Section IX-2021 Welding, Brazing, and Fusing Qualifications

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C. ASTM International (ASTM):

A47/A47M-99(2018)e1.....Standard Specification for Ferritic Malleable

Iron Castings

A53/A53M-2020...........Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and

Seamless

A105/A105M-2021.........Standard Specification for Carbon Steel

Forgings for Piping Applications

A106/A106M-2019.........Standard Specification for Seamless Carbon

Steel Pipe for High-Temperature Service

A193/A193M-2020.........Standard Specification for Alloy-Steel and

Stainless-Steel Bolting for High Temperature or

High-Pressure Service and Other Special Purpose

Applications

A194/A194M-2020.........Standard Specification for Carbon Steel, Alloy

Steel, and Stainless-Steel Nuts for Bolts for

High Pressure or High-Temperature Service, or

Both

A197/A197M-00(2019).....Standard Specification for Cupola Malleable

Iron

A216/A216M-2018.........Standard Specification for Steel Castings, Carbon, Suitable for Fusion Welding, For High-

Temperature Service

A234/A234M-2019.........Standard Specification for Piping Fittings of

Wrought Carbon Steel and Alloy Steel for

Moderate and High Temperature Service

A269/A269M-15a(2019)....Standard Specification for Seamless and Welded

Austenitic Stainless-Steel Tubing for General

Service

A395/A395M-99(2018).....Standard Specification for Ferritic Ductile

Iron Pressure-Retaining Castings for Use at

Elevated Temperatures

B62-2017................Standard Specification for Composition Bronze or Ounce Metal Castings

B88-2020................Standard Specification for Seamless Copper

Water Tube

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D. American Welding Society (AWS):

B2.1/B2.1M-2014.........Specification for Welding Procedure and

Performance Qualification

Z49.1-2012..............Safety in Welding and Cutting and Allied

Processes

E. California Referenced Standards Codes (CRSC):

Title 24 Part 12-2016

F. Manufacturers Standardization Society of the Valve and Fittings

Industry (MSS):

SP-45-2020..............Bypass and Drain Connections

SP-58-2018..............Pipe Hangers and Supports - Materials, Design, Manufacture, Selection, Application, and

Installation

SP-80-2019..............Bronze Gate, Globe, Angle and Check Valves

SP-97-2019..............Integrally Reinforced Forged Branch Outlet

Fittings – Socket Welding, Threaded, and

Buttwelding Ends

SP-127-2014a............Bracing for Piping Systems: Seismic – Wind –

Dynamic Design, Selection, and Application

G. National Fire Protection Association (NFPA):

30-2021.................Flammable and Combustible Liquids Code

31-2020.................Standard for the Installation of Oil-Burning

Equipment

54-2021.................National Fuel Gas Code

85-2019.................Boiler and Combustion Systems Hazards Code

H. Pipe Fabrication Institute (PFI):

ES-24-2015..............Pipe Bending Methods, Tolerances, Process and

Material Requirements

1.4 SUBMITTALS

A. Submittals, including number of required copies, shall be submitted in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND

SAMPLES.

B. Information and material submitted under this section shall be marked

“SUBMITTED UNDER SECTION 23 21 11, BOILER PLANT PIPING SYSTEMS”, with applicable paragraph identification.

C. Manufacturer's Literature and Data including Full item description and optional features and accessories. Include dimensions, weights, 23 21 11 - 4 materials, applications, standard compliance, model numbers, size, and capacity.

1. Piping:

a. ASTM material specification number.

b. Grade, class or type, schedule number.

c. Manufacturer.

d. Intended service.

2. Pipe Fittings, Unions, Flanges:

a. ASTM material specification number.

b. ASME standards number.

c. Catalog cuts.

d. Pressure and temperature ratings.

e. Intended service.

3. Valves - Gate, Globe, Check, Plug, Butterfly, Ball:

a. Catalog cuts showing design and construction.

b. Pressure and temperature ratings.

c. Materials of construction.

d. Accessories.

e. Intended service.

4. Sight Flow Indicators:

a. Catalog cuts showing design and construction.

b. Pressure and temperature ratings.

c. Materials of construction.

d. Intended service.

5. Quick - Couple Hose Connectors and Steam Hose:

a. Catalog cuts showing design and construction.

b. Pressure and temperature ratings.

c. Materials of construction.

d. Type of seal between couplings.

e. Flexibility of steam hose.

6. Pressure Reducing and Regulating Valves, Back Pressure Relief

Valves, Safety Valves, Relief Valves:

a. Catalog cuts showing design and construction.

b. Service limitations (type of fluid, maximum pressure, and temperatures).

c. Materials of construction.

d. Flow capacity at required set pressure or differential pressure.

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e. Predicted sound levels, at operating condition, for steam pressure reducing valves.

7. Strainers:

a. Catalog cuts showing design and construction.

b. Pressure and temperature ratings.

c. Materials of construction.

d. Strainer basket or liner mesh size.

e. Pressure loss and flow rate data.

f. Intended service.

8. Emergency Gas Safety Shutoff Valves:

a. Catalog cuts showing design and construction.

b. Maximum pressure rating.

c. Material of construction.

d. Pressure loss and flow rate data.

9. Steam Traps:

a. Catalog cuts showing design and construction.

b. Service limitations (maximum pressures and temperatures).

c. Materials of construction.

d. Flow rates at differential pressures shown in contract documents.

e. Orifice size for each trap.

f. Monitoring equipment or attachments

10. Flexible Connectors:

a. Catalog cuts showing design and construction.

b. Pressure and temperature ratings.

c. Materials of construction.

d. Maximum allowable lateral and axial movements.

e. Description of type of movement permitted intermittent offset or continuous vibration.

f. Intended service.

11. Pipe Support Systems: The contractor shall provide the following with submissions.

a. Credentials of technical personnel who will design the support systems.

b. Description of computer program for pipe support selection indicating its capability and limitations. Provide documentation showing both program verification and validation results. List of projects where it was employed successfully.

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c. Input and output data for pipe support selection program for all piping systems with pipe sizes 65 mm (2-1/2 inches) and above.

d. Boiler, feedwater deaerator and header manifold steam nozzle

(pipe connection) allowable and actual forces and moments imposed by connecting piping.

e. Hanger load calculation methods and results for piping systems with pipe sizes 50 mm (2 inches) and below.

f. Piping layouts showing location and type of each hanger support and anchors with unique identifiers that can be referenced back to the calculation results.

g. Catalog cuts showing design and construction of each hanger support and anchor and their conformance to MSS standards.

h. Drawings showing arrangement and sizes of all components comprising each spring-type hanger and support assembly.

i. Load rating and movement tables for all spring hangers, and seismic shock absorbing devices.

D. Complete operating and maintenance manuals including wiring diagrams, technical data sheets, information for ordering replacement parts, and troubleshooting guide:

1. Include complete list indicating all components of the systems.

2. Include complete diagrams of the internal wiring for each item of equipment.

3. Diagrams shall have their terminals identified to facilitate installation, operation, and maintenance.

1.5 QUALITY ASSURANCE

A. Entire installation shall comply with ASME B31.1 and appendices and

NFPA 54.

B. Boiler External Piping, as defined in the ASME BPVC Section I, is required to be constructed and inspected in conformance with the ASME

Code.

C. The products and execution of work specified in this section shall conform to the referenced codes and standards as required by the specifications. Local codes and amendments shall be enforced, along with requirements of local utility companies. The most stringent requirements of these specifications, local codes, or utility company requirements shall always apply. Any conflicts shall be brought to the attention of the COR.

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D. Welding Qualifications: Before any welding is performed, contractor shall submit a certificate certifying that welders comply with the following requirements:

1. Qualify welding processes and operators for piping according to ASME

BPVC Section IX, AWS Z49.1 and AWS B2.1/B2.1M.

2. Comply with provisions in ASME B31.9.

3. Certify that each welder and welding operator has passed AWS qualification tests for welding processes involved and that certification is current and recent. Submit documentation to the

COR.

4. All welds shall be stamped according to the provisions of the

American Welding Society.

E. ASME Compliance: Comply with ASME B31.9for materials, products, and installation. Safety valves and pressure vessels shall bear appropriate

ASME labels.

1.6 DELIVERY, STORAGE AND HANDLING

A. All piping shall be stored and kept free of foreign material and shall be internally and externally cleaned of all oil, dirt, rust, and foreign material. Deliver and store valves and pipe hangers in sealed shipping containers with labeling in place. Storage shall be in dry, protected location.

1.7 INFORMATION ON PRESSURE-TEMPERATURE DESIGN OF PIPING SYSTEMS

A. Steam service pressures are selected to provide optimum pressure to the facilities served by the boiler plant. Main steam header pressure shall be controlled at 120 psi. Maximum pressure capability of steam systems between boilers and through first pressure reducing valve protected by a safety valve shall be governed by the pressure/temperature relationship of the highest safety valve setting shown for the boilers.

B. Steam distribution systems protected by safety valves following pressure reducing stations or protected by safety valves on the boilers shall be governed by the pressure/temperature relationship developed by the maximum setting of the safety valve on that system.

C. Boiler feedwater systems between boiler feed pumps, economizers (if provided), and boilers are designed for a normal maximum temperature of

138 degrees C (280 degrees F), and emergency temperature of 213 degrees

C (415 degrees F) (if economizers are provided and economizer safety relief valve setting is 1896 kPa (275 psig)). Design pressure is the

23 21 11 - 8 greater of boiler feed pump shut off head; or 1896 kPa (275 psig) set pressure, plus accumulation, of economizer (if provided) relief valve.

D. Condensate collection and transfer systems to suction of boiler feed pumps are designed for maximum temperatures to 100 degrees C (212 degrees F), and pressures 276 kPa (40 psig). Vacuum return systems shall operate between 0 and 27 kPa (0 and 8-inch Hg) vacuum and equivalent steam saturation temperatures.

E. Natural gas fuel systems are designed, and materials & equipment are applied to prevent failure under gas pressure of 15 psi entering

Government property. LP gas systems for igniters (pilots) are designed for maximum LP tank pressure of 1724 kPa (250 psig).

F. Fuel oil system pressures are determined by the requirements of the burners and fuel trains. No. 2 oil systems are designed for maximum temperatures of 54 degrees C (130 degrees F), and pressures of 1034 kPa

(150 psig).

G. Water service pressures are 225 psi maximum. Systems are designed to operate under conditions of maximum available pressure.

H. Drips, drains, blowdown, water sampling, and chemical treatment are designed, and materials and equipment are applied in accordance with the maximum pressure and temperature of the system with which they are associated.

I. Low pressure steam, condensate, vacuum, and vents are designed for service pressures and temperatures equivalent to 103 kPa (15 psig) saturated steam.

J. Compressed air systems are designed to accommodate a maximum pressure of 861 kPa (125 psig).

K. Instrumentation and control piping shall be provided for the service and pressure characteristics of the systems to which they are connected.

1.8 AS-BUILT DOCUMENTATION

A. Comply with requirements in Paragraph “AS-BUILT DOCUMENTATION” in

Section 23 05 10 COMMON WORK RESULTS FOR BOILER PLANT AND STEAM

GENERATION.

B.

PART 2 - PRODUCTS

2.1 STEAM PIPING

A. Pipe: Carbon steel, ASTM A53/A53M Grade B or ASTM A106/A106M Grade B, seamless or electric resistance welded (ERW). Schedule 40 for piping up

23 21 11 - 9 to 861 kPa (125 psig) with welded ends. Schedule 80 for piping with threaded ends and piping over 861 kPa (125 psig) with welded ends.

B. Joints:

1. Pipe sizes 65 mm (2-1/2 inches) and above: Butt-welded, no other types allowed.

2. Pipe sizes 50 mm (2 inches) and below: Threaded, butt-welded, or socket-welded. Use Schedule 80 pipe and fittings for threaded joints.

C. Fittings:

1. Welded joints: Steel, ASTM A234/A234M, Grade B, ASME B16.9, same schedule as adjoining pipe, all elbows long radius.

2. Threaded joints: Forged steel, ASME B16.ll, 13,790 kPa (2000 psig) class. Use Schedule 80 pipe and fittings for threaded joints.

3. Socket-welded joints: Forged steel, ASME B16.11, 13,790 kPa (2000 psig) class.

D. Unions on Threaded Piping: Forged steel, 13,790 kPa (2000 psig) class or 20,685 kPa (3000 psig) class on piping 50 mm (2 inches) and under.

E. Flanges and Bolts: Forged steel weld neck, ASME B16.5, ASTM A105/A105M, 1034 kPa (150 psig) pressure class, except 2070 kPa (300 psig) class required adjacent to 1724 kPa (250 psig) and 2070 kPa (300 psig) class valves. Bolts shall be high strength steel ASTM A193/A193M, Grade B7.

Nuts shall be ASTM A194/A194M.

2.2 STEAM CONDENSATE PIPING

A. Includes all gravity, drip return, pumped and vacuum systems. Does not include piping system between boiler feed pumps and boilers.

B. Pipe: Carbon steel, ASTM A53/A53M Grade B or ASTM A106/A106M Grade B, seamless or ERW, Schedule 80.

C. Joints:

1. Pipe sizes 65 mm (2-l/2 inches) and above: Butt-welded, no other types allowed.

2. Pipe sizes 50 mm (2 inches) and below: Schedule 80 threaded, butt-welded or socket-welded.

D. Fittings:

1. Welded joints: Steel, ASTM A234/A234M, Grade B, ASME B16.9, same schedule as adjoining pipe.

2. Threaded joints: Forged steel, ASME B16.ll, 13,790 kPa (2000 psig class. Use Schedule 80 pipe and fittings for threaded joints.

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3. Socket-welded joints: Forged steel, ASME B16.11, 13,790 kPa (2000 psig) class.

E. Unions on Threaded Piping: For piping 50 mm (2 inches) and under, forged steel, 13,790 kPa (2000 psig) class or 20,685 kPa (3000 psig) class. Use Schedule 80 pipe and fittings for threaded joints.

F. Flanges: Forged steel weld neck, ASTM A105/A105M, ASME B16.5, 1034 kPa

(150 psig).

2.3 FUEL PIPING

A. Natural gas, LP gas (propane), fuel oil (No. 2 heated) for main burner and igniter (pilot) fuels, gas vent piping. Comply with ASME B3l.l and

NFPA 54.

B. Piping: Carbon steel, ASTM A53/A53M Grade B or ASTM A106/A106M Grade B, seamless or ERW, Schedule 40. Fuel oil piping shall be seamless downstream of burner automatic shutoff valves.

C. Joints:

1. Pipe sizes 65 mm (2-l/2 inches) and above: Butt-welded, no other types allowed.

2. Pipe sizes 50 mm (2 inches) and below: Socket-welded or butt-welded.

D. Fittings:

1. Butt-welded joints: Steel, ASTM A234/A234M, Grade B, ASME B16.9, same schedule as adjoining pipe.

2. Socket-welded joints: Forged steel, ASME B16.ll, 13,790 kPa (2000 psig class.

E. Unions on piping 50 mm (2 inches) and under: Forged steel, 13,790 kPa

(2000 psig) class or 20,685 kPa (3000 psig) class.

F. Flanges: Forged steel weld neck, ASME B16.5, ASTM A105/A105M, 1034 kPa

(150 psig).

G. Companion flanges: Flanges and bolting shall conform to ASME B16.5.

H. Burner Piping: Furnished as part of the factory-assembled burners may be manufacturer's standard materials and assembly. Comply with ASME

B31.1, for the actual operating conditions.

I. Igniter (Pilot) Piping: Furnished as part of the factory assembled burners. If threaded fittings are provided, piping shall be Schedule

80.

2.4 BOILER FEEDWATER PIPING

A. Piping from boiler feedwater pump discharge to inlet of boilers.

B. Pipe: Carbon steel, ASTM A53/A53M Grade B or ASTM A106/A106M Grade B, seamless or ERW. Piping with threaded joints shall be Schedule 80;

23 21 11 - 11 welded joints Schedule 40. The joining by welding of two different schedules of pipe is prohibited.

C. Joints:

1. Pipe sizes 65 mm (2-1/2 inches) and above: Butt-welded, no other types are allowed.

2. Pipe sizes 50 mm (two inches) and below: Threaded, butt-welded, or socket-welded.

3. No pipe-to-pipe joints when the length of the run is less than a full length of pipe.

D. Fittings:

1. Butt-welded Joints: Steel, ASTM A234/A234M, Grade B, ASME B16.9, same schedule as adjoining pipe.

2. Threaded Joints: Forged steel, ASME B16.ll, 13,790 kPa (2000 psig class. Use Schedule 80 pipe and fittings for threaded joints.

3. Socket-welded joints: Forged steel, ASME B16.11, 13,790 kPa (2000 psig) class.

E. Unions: Forged steel, 13,790 kPa (2000 psig) class or 20,685 kPa (3000 psig) class.

F. Flanges and Bolts: Forged steel weld neck, ASME B16.5, ASTM A105/A105M, 2070 kPa (300 psig) pressure class. Bolts shall be High strength ASTM

A193/A193M, Grade B7. Nuts shall be ASTM A194/A194M.

2.5 DRAIN PIPING FROM BOILER ACCESSORIES TO DRAIN VALVE

A. Drain piping from water column, low water cutoffs, gauge glass, water level sensor, remote water level devices (where applied).

B. Pipe: Carbon steel, ASTM A106/A106M, seamless, Schedule 40.

C. Joints: Threaded.

D. Fittings: Forged steel, ASME B16.ll, 13,790 kPa (2000 psig) class.

E. Unions: Forged steel, 13,790 kPa (2000 psig) class or 20,685 kPa (3000 psig) class.

2.6 VENT LINES FROM TANKS AND SAFETY AND RELIEF VALVES

A. Pipe: Carbon steel, ASTM A53/A53M Grade B or A106/A106M Grade B, seamless or ERW, Schedule 40.

B. Joints:

1. Pipe sizes 65 mm (2-l/2 inches) and above: Butt-welded, no other types are allowed.

2. Pipe sizes 50 mm (2 inches) and below: Threaded or butt-welded.

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C. Fittings:

1. Welded Joints: Steel, ASTM A234/A234M, Grade B, ASME B16.9, same schedule as adjoining pipe.

2. Threaded Joints: Steel, ASTM A234/A234M, Grade B, ASME B16.9, Schedule 80.

D. Unions: Forged steel, 13,790 kPa (2000 psig) class or 20,685 kPa (3000 psig) class.

E. Flanges: Forged steel weld neck, ASME B16.5, ASTM A105/A105M, 1034 kPa

(150 psig).

2.7 COLD WATER PIPING

A. Soft Water: See Section 22 31 11, WATER SOFTENERS.

B. City Water: See Section 22 11 00, FACILITY WATER DISTRIBUTION.

C. All copper pipes shall use only soldered fittings.

2.8 COMPRESSED AIR PIPING (FUEL OIL ATOMIZING SERVICE)

A. Pipe: Carbon steel, ASTM A53/A53M Grade B or ASTM A106/A106M Grade B, seamless or ERW Schedule 40.

B. Joints: Threaded.

C. Fittings: Forged steel, ASME B16.ll, 13,790 kPa (2000 psig class); or malleable iron ASTM A47/A47M or ASTM A197/A197M, ASME Bl6.3, 1034 kPa

(150 psig) class.

D. Unions: Forged steel, 13,790 kPa (2000 psig) class or 20,685 kPa (3000 psig) class; or malleable iron, 1034 kPa (150 psig) class.

2.9 MISCELLANEOUS PIPING

A. Instrument and Control Piping (Sensing Point to Transmitter, Controller, or Other Instrument): Construction shall be same as specified for main service.

B. Drain Piping (All Drain Piping Discharging to Floor Drain-From Drain

Valve to Floor Drain):

1. Pipe: Carbon steel, ASTM A53/A53M Grade B or ASTM A106/A106M Grade

B, seamless or ERW, Schedule 40.

2. Fittings and Unions: Forged steel, ASME B16.ll, 13,790 kPa (2000 psig class); or malleable iron, 1034 kPa (150 psig), threaded.

2.10 DIELECTRIC FITTINGS

A. Provide threaded dielectric unions for pipe sizes 50 mm (2 inches) and under. For 65 mm (2-1/2 inches) and above, provide steel flanges electrically isolated at gasket and by sleeves at bolts. Fittings on cold water and soft water lines shall be rated for 690 kPa (100 psig), 27 degrees C (80 degrees F). Fittings on steam condensate lines shall

23 21 11 - 13 be rated at 520 kPa (75 psig), 121 degrees C (250 degrees F). Fittings on other services shall be rated for the maximum pressure and temperature conditions of the service.

2.11 VALVES; GATE, GLOBE, PLUG, CHECK, BALL, BUTTERFLY, VENT COCKS

A. Valves for particular services are generally specified as Type Numbers.

The Type Numbers are defined below. All valves of the same type shall be the products of a single manufacturer. Comply with MSS SP-45, MSS

SP-80, and ASME B3l.l. Design valves for the service fluids and conditions. Pressure-temperature ratings listed are minimum requirements. Packing and gaskets shall not contain asbestos.

B. Valve Type Designations:

1. Gate Valves:

a. Type 101: Cast steel body ASTM A216/A216M WCB, Class 150, rated for 1034 kPa at 260 degrees C (150 psig at 500 degrees F), ll.5 to l3 percent chromium stainless steel flexible wedge and hard faced (stellite) or nickel copper alloy seats, 1034 kPa (150 psig) ASME flanged ends, OS&Y, rising stem, bolted bonnet.

1) Provide factory installed globe-valved warm-up bypass when main valve is 75 mm (3 inch) pipe size or greater and serves steam main longer than 6.1 m (20 feet). Conform to MSS SP-45.

2) Drill and tap bosses for connection of drains if valve is in steam service. Conform to MSS SP-45.

b. Type 102: Cast steel body ASTM A2l6/A216M WCB, Class 300, ll.5 to l3 percent chromium stainless steel flexible wedge and hard faced

(stellite) alloy seats, ASME flanged ends, OS&Y, rising stem, and bolted bonnet.

1) Provide factory installed globe-valved bypass when main valve is 75 mm (3 inch) pipe size or greater and serves steam main longer than 6.1 m (20 feet). Conform to MSS SP-45.

2) Drill and tap bosses for connection of drains if valve is in steam service. Conform to MSS SP-45.

c. Type 103: Cast steel body ASTM A2l6/A216M WCB, Class 150, ll.5 to l3 percent chromium stainless steel flexible wedge and hard faced

(stellite) alloy seats, ASME flanged ends, OS&Y, rising stem, and bolted bonnet.

1) Provide factory installed globe-valved bypass when main valve is 75 mm (3 inch) pipe size or greater and serves steam main longer than 6.1 m (20 feet). Conform to MSS SP-45.

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2) Drill and tap bosses for connection of drains if valve is in steam service. Conform to MSS SP-45.

d. Type 105: Forged steel body ASTM A105/A105M, rated for 2070 kPa at 216 degrees C (300 psig at 420 degrees F) Class 300 minimum, Class 600 or Class 800, hardened stainless steel or stellite wedge and seats, threaded ends, OS&Y, rising stem, bolted bonnet.

2. Globe Valves:

a. Type 201: Cast steel body ASTM A216/A216M WCB, Class 150 minimum, rated for 1034 kPa at 260 degrees C (150 psig at 500 degrees F), 11-1/2 to 13 percent chromium stainless steel or stellite disc and seat, 1034 kPa (150 psig) ASME flanged ends, OS&Y, rising stem, bolted bonnet, renewable seat rings. Drill and tap bosses for connection of drains where shown. Conform to MSS SP-45.

b. Type 205: Forged steel body ASTM A105/A105M, Class 150 minimum, rated for 2070 kPa at 216 degrees C (300 psig at 420 degrees F) minimum, Class 600 or Class 800, stainless steel disc, stellite seat, threaded ends, OS&Y, rising stem, bolted bonnet.

3. Plug Valves: Cast steel body ASME B16.5 Class 150, one-fourth turn to open. 861 kPa (125 psig) ASME flanged ends for pipe sizes above

50 mm (2 inches), threaded ends for pipe sizes 50 mm (2 inches) and under. All components designed for service to which applied: natural gas, LP gas (propane), or fuel oil. Furnish lever handle for each valve.

a. Type 301: Two-way valves up through 100 mm (4 inches) pipe size.

Eccentric action, non-lubricated plug with resilient seal molded into groove on plug face providing bubble-tight shut off. O-ring stem seal, corrosion-resistant bearings, corrosion-resistant seat coating, seal materials as recommended by valve manufacturer for the service. Valves on natural gas service AGA approved.

b. Type 302: Two-way valves 125 mm (5 inches) pipe size and above, all sizes of three-way valves. Lubricated full-port plug type with lubricant for intended service. Reinforced Teflon stem seal, valve plug floated on Teflon surfaces, lubricant injection system that has sufficient pressure to fully lubricate all sealing surfaces. Provide laminated plastic label attached to each valve stating, “Lubricate with //(Insert appropriate description)// once a year”.

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4. Check Valves:

a. Type 401: Not used.

b. Type 402: Swing-type, cast steel body ASME B16.34, rated for 1724 kPa (250 psig) saturated steam, 3447 kPa (500 psig) WOG, bronze or bronze-faced disc and seat, 1724 kPa (250 psig) ASME flanged ends, bolted cover, renewable disc, and seat.

c. Type 403: Swing-type, cast steel body ASME B16.34, rated for 861 kPa (l25 psig) saturated steam, 1380 kPa (200 psig) WOG, bronze or bronze-faced disc and seat, 861 kPa (l25 psig) ASME flanged ends, bolted cover, renewable disc, and seat.

d. Type 405: Lift-type, forged steel body ASTM A105/A105M, rated for

2070 kPa at 216 degrees C (300 psig at 420 degrees F) minimum

(Class 4138 kPa (600 psig) or 5515 kPa (800 psig)), hardened stainless steel disc, hard faced seat, bolted cover, threaded ends.

e. Type 406: Swing-type, Type 316 stainless steel body, disc, and hanger, rated for 1724 kPa at 182 degrees C (250 psig at 360 degrees F) minimum.

f. Type 408: Silent spring-loaded wafer type, cast steel ASTM

A216/A216M WCB body, rated for 2070 kPa (300 psig) water, 121 degrees C (250 degrees F), stainless steel trim.

5. Ball Valves: Reduced port permitted for bypass (throttling) service;

full port required for all other services, one-fourth turn to open.

a. Type 501: Type 316 stainless steel body, ball, and stem, rated for 1034 kPa at 185 degrees C (150 psig at 365 degrees F), 4138 kPa at 93 degrees C (600 psig at 200 degrees F); reinforced TFE seat, stem seal and thrust washer; end entry, threaded ends.

b. Type 502: Steel body, rated for 1034 kPa at 185 degrees C (150 psig at 365 degrees F), 1724 kPa at 121 degrees C (250 psig at

250 degrees F), reinforced TFE seat, stem seal and thrust washer;

end entry, threaded ends, UL-listed for natural or LP gas shut off service when used on those services.

c. Type 503: Carbon steel body, steam service, rated for 1380 kPa at

200 degrees C (200 psig at 392 degrees F), stainless steel ball and stem, Polyfil seat, live-loaded or adjustable stem seal, threaded ends.

23 21 11 - 16

d. Type 504: Carbon steel body, saturated steam service, rated for

1034 kPa (150 psig), stainless steel ball and stem, Polyfil seat, live-loaded stem seal, ASME flanged ends.

6. Butterfly Valves:

a. Butterfly valves are for flow control only. Butterfly valves are prohibited to be used for isolation or lockout tagout purposes.

Further Butterfly valves are prohibited on any steam applications.

b. Type 602: Carbon steel body, triple-offset design, lug or flanged type, ASME Class 150//300//600, Temperature range -29 degrees C to 204 degrees C (-20 degrees F to 400 degrees F) at 1723 kPa

[250 psi] working pressure, rated for WOG Service, stainless steel nitride disc, stainless steel seat, stainless steel shaft, stainless steel/graphite laminated seal ring, neck extending beyond pipe insulation, geared handwheel operator for valves 100 mm (4 inch) pipe size and over, lever operator for valves 75 mm

(3 inch) pipe size and under.

7. Gas Vent Cocks: Type 701, bronze body, tee handle, rated for 207 kPa at 38 degrees C (30 psig at 100 degrees F), ground plug, rated for tight shut-off on fuel gas service.

C. Steam 103 kPa (15 psig) and under:

1. Gate Valves, 50 mm (2 inches) and under: Type 101.

2. Gate valves, 65 mm (2-1/2 inches) and above: Type 101.

3. Globe valves, 50 mm (2 inches) and under: Type 201.

4. Globe valves, 65 mm (2-1/2 inches) and above: Type 201.

5. Ball valves, 50 mm (2 inches) and under: Type 504.

6. Ball valves, 65 mm (2-1/2 inches) and above: Type 504.

D. Boiler Feedwater from Pumps to Boilers, Recirculation:

1. Gate valves, 50 mm (2 inches) and under: Type 105.

2. Gate valves, 65 mm (2-1/2 inches) and above: Type 102.

3. Globe valves, 50 mm (2 inches) and under: Type 205.

4. Globe valves, 65 mm (2-l/2 inches) and above: Type 205.

5. Check valves, at boiler feed pump discharge: Type 408.

6. Check valves, at boiler, 50 mm (2 inches) and under: Type 405.

7. Check valves, at boiler, 65 mm (2-1/2 inches) and above: Type 402.

23 21 11 - 17

E. Condensate, Condensate Transfer, Boiler Feedwater from Feedwater

Deaerator to Boiler Feed Pump Suction, Overflow, Control and Instrument

Piping for Condensate Storage Tank and for Feedwater Deaerator:

1. Gate valves, 50 mm (2 inches) and under: Type 105.

2. Gate valves, 65 mm (2-1/2 inches) and above: Type 103.

3. Globe valves, 50 mm (2 inches) and under: Type 205.

4. Globe valves, 65 mm (2-1/2 inches) and above: Type 205.

5. Butterfly valves, 65 mm (2-1/2 inches) and above Type 602.

6. Ball valves, 50 mm (2 inches) and under: Type 502.

7. Ball valves, 65 mm (2-1/2 inches) and above: Type 504.

8. Check valves 50 mm (2 inches) and under: Type 405.

9. Check valves, 65 mm (2-1/2) inches and above: Type 403.

10. Check valves on pump discharge, all sizes: Type 408.

F. Fuel Oil: Discharge side of pumps. Conform to NFPA 30 and NFPA 3l.

1. Gate valves, 50 mm (2 inches) and under: Type 105.

2. Gate Valves, 65 mm (2-l/2 inches) and above: Type 101 or 102.

3. Globe valves, 50 mm (2 inches) and under: Type 205.

4. Plug valves, 100 mm (4 inches) and under: Type 301. (Tank isolating valve on return line.)

5. Check valves, 50 mm (2 inches) and under: Type 405 or 408.

6. Check valves, 65 mm (2-l/2 inches) and above: Type 402 or 408.

7. Ball valves, 50 mm (2 inches) and under: Type 502.

G. Fuel Oil: Suction side of pumps and tank fill lines where tank is below fill-point. Conform to NFPA 30 and NFPA 3l.

1. Gate valves, 50 mm (2 inches) and under: Type 105.

2. Gate valves, 65 mm (2-l/2 inches) and above: Type 103.

3. Plug valves, 100 mm (4 inches) and under: Type 301.

4. Check valves, 50 mm (2 inches) and under: Type 405.

5. Check valves, 65 mm (2-l/2 inches) and above: Type 403.

6. Ball valves, 50 mm (2 inches) and under: Type 502.

H. Fuel Oil: Tank fill lines where tank is above fill point.

1. Gate valves, 50 mm (2 inches) and under: Type 105.

2. Gate valves, 65 mm (2-1/2 inches) and above: Type 103.

3. Check valves, all sizes: Type 408.

I. Fuel Gas: Main fuel and igniter (pilot) systems.

1. Plug valves, 100 mm (4 inches) and under: Type 301.

2. Ball valves, 50 mm (2 inches) and under: Type 502. Shall be applied where plug valves are shown.

23 21 11 - 18

3. Plug valves, 125 mm (5 inches) and above: Type 302.

4. Plug valves, three-way, all sizes: Type 302.

5. Check valves, 50 mm (2 inches) and under: Type 405.

6. Vent cocks, 15 mm (1/2 inch) and under: Type 701.

J. Compressed Air:

1. Gate valves, 50 mm (2 inches) and under: Type 105.

2. Ball valves, 50 mm (2 inches) and under: Type 502.

K. City (Cold) Water: See Section 22 11 00, FACILITY WATER DISTRIBUTION.

L. Instrumentation and Control Piping: Ball valves, 50 mm (2 inches) and under: Type 502.

2.12 GAUGES, PRESSURE AND COMPOUND

A. ASME B40.100, Accuracy Grade 1A, (pressure, vacuum, or compound), initial mid-scale accuracy 1 percent of scale (Qualify grade), metal or phenolic case, 115 mm (4-1/2 inches) in diameter, 6 mm (1/4 inch) NPT bottom connection, white dial with black graduations and pointer, clear glass or acrylic plastic window, suitable for board mounting. Provide red "set hand" to indicate normal working pressure.

B. Provide steel, lever handle union cock. Provide steel or stainless-steel pressure snubber for gauges in water service. Provide steel pigtail syphon for steam gauges.

C. Pressure gauge ranges shall be selected such that the normal operating pressure for each gauge is displayed near the midpoint of each gauge’s range. Gauges with ranges selected such that the normal pressure is displayed at less than 30 percent or more than 70 percent of the gauge’s range are prohibited. The units of pressure shall be psig.

2.13 SIGHT FLOW INDICATORS

A. Provide, where shown, to allow observation of flow in piping systems.

B. Type: In line, dual portholes on opposite sides, with safety shield, with or without rotor as shown in contract documents. Where provided, rotor shall have minimum of three vanes.

C. Construction: Carbon steel body, tempered borosilicate window, PTFE seals (except Buna-N on oil service), threaded ends on pipe sizes under

65 mm (2-1/2 inches), flanged ends on sizes 65 mm (2-1/2 inches) and above. Pressure and temperature ratings shall be equivalent to requirements for valves on the same pipelines.

D. Safety Shield: Transparent wrap-around overlap covering entire sight flow indicator, designed to protect personnel from failure of

23 21 11 - 19 indicator. Shield shall fit the indicator tightly and be suitable for

1034 kPa, 150 degrees C (150 psig, 302 degrees F).

2.14 QUICK-COUPLE HOSE CONNECTORS AND STEAM HOSES

A. Provide on all Y-strainer drains and as shown to allow quick connection of length of hose to piping drain or blowoff so that discharge fluid

(water or steam) can be conveyed to a drainage system.

B. Type: Straight through, plug and socket, screw type or cam locking connections, all units 20 mm (3/4 inch) pipe size. Integral shut-off devices not required.

C. Service: Design for water and steam at 103 kPa (15 psig), 154 degrees C

(309 degrees F).

D. Spare Parts: Furnish one socket and one plug.

E. Accessories: Furnish two hoses 6.1 m (20 feet) long, 20 mm (3/4 inch) inside diameter, rated for steam service at 690 kPa, 149 degrees C (100 psig, 300 degrees F). Hose shall be sufficiently flexible to be placed in 1200 mm (4 foot) diameter coil. Provide connector on one end of each hose to mate with connectors on drains. Provide hose rack for holding both hoses. Securely mount rack in location selected by COR.

2.15 SAFETY VALVES, RELIEF VALVES, SAFETY RELIEF VALVES AND ACCESSORIES

A. Provide valves and accessories to protect piping systems and pressure vessels from over-pressure. All valves shall comply with ASME BPVC

Section I and ASME BPVC Section VIII). Flow capacities shall be certified by National Board of Boiler and Pressure Vessel Inspectors

(NB).

B. Boiler and Economizer Service: Refer to Section 23 52 39, FIRE-TUBE

BOILERS or Section 23 52 33, WATER-TUBE BOILERS.

C. Steam Service (Pressure Vessels and Piping Systems): Refer to schedules in the contract documents for set pressures and capacities. Provide lifting levers, stainless steel trim, lapped seats on steel valves.

D. Fuel Oil Service: Refer to Section 23 50 11, BOILER PLANT MECHANICAL

EQUIPMENT.

E. Compressed Air Service: Refer to Section 23 50 11, BOILER PLANT

MECHANICAL EQUIPMENT.

F. Drip Pan Ells: Cast iron factory-built safety valve discharge fitting with pipe-within-pipe slip-type connection to vertical vent pipe, basin for collecting condensate from vent pipe, drain connections on basin and at base of ell.

23 21 11 - 20

2.16 STRAINERS, SIMPLEX BASKET TYPE

A. Provide on condensate lines where shown. Refer to Section 23 50 11, BOILER PLANT MECHANICAL EQUIPMENT, for duplex basket strainers at oil pumps.

B. Type: Simplex cylindrical basket type, clamp cover, closed-bottom, removable basket, drain at bottom with threaded plug.

C. Service: Water at 100 degrees C (212 degrees F), 103 kPa (15 psig) maximum pressure.

D. Construction:

1. Body: Cast steel rated for 861 kPa (125 psig) ASME flanged ends, flow arrows cast on side.

2. Basket: Stainless steel, 3.2 mm (1/8 inch) perforations. Ratio of screen open area to cross section of pipe; four to one minimum.

2.17 STRAINERS, Y-TYPE

A. Provide as shown on steam, water, and compressed air piping systems.

B. Type: Open-end removable cylindrical screen. Threaded blow-off connection.

C. Construction:

1. Steam Service 420 to 1034 kPa (61 to 150 psig): Cast steel rated for

1034 kPa (150 psig) saturated steam with 1034 kPa (150 psig) ASME flanged ends, or forged steel with 1724 kPa (250 psig) ASME flanged ends, for pipe sizes above 50 mm (2 inches). Cast steel rated for saturated steam at 1034 kPa (150 psig) threaded ends, for pipe sizes

50 mm (2 inches) and under.

2. Steam Service 414 kPa (60 psig) and under, water (except boiler feed between feedwater pumps and boilers), compressed air: Cast steel rated for 861 kPa (125 psig) saturated steam, 1200 kPa (175 psig)

WOG, with 861 kPa (125 psig) ASME flanged ends, for pipe sizes above

50 mm (2 inches). Cast steel, threaded ends, rated for 861 kPa (125 psig) saturated steam, 1200 kPa (175 psig) WOG, for pipe sizes 50 mm

(2 inches) and under.

3. Boiler Feed between Feedwater Pumps and Boilers: Cast steel rated for 1724 kPa at 232 degrees C (250 psig at 450 degrees F) with 2070 kPa (300 psig) ASME flanged ends or cast steel with 1724 kPa (250 psig) ASME flanged ends, for pipe sizes above 50 mm (2 inches). Cast steel, threaded ends, rated for 1724 kPa at 232 degrees F (250 psig at 450 degrees F) for pipe sizes 50 mm (2 inches) and under.

23 21 11 - 21

D. Screen: Monel or stainless steel, free area not less than 2-1/2 times flow area of pipe. For strainers 75 mm (3 inch) pipe size and smaller, diameter of openings shall be 0.8 mm (0.032 inch) or less on steam service, 1.3 mm (0.05 inch) or less on water service, 0.3 mm (0.01 inch) or less on compressed air service. For strainers 100 mm (4 inch) pipe size and greater, diameter of openings shall be 1.3 mm (0.05 inch) on steam service, 3.2 mm (1/8 inch) on water service. Provide 80 mesh stainless steel screen liner on all strainers installed upstream of water meters or control valves.

E. Accessories: Gate or ball valve and quick-couple hose connection on all blowoff connections. These items are specified elsewhere in this section.

2.18 LIQUID PETROLEUM TANKS GAS PRESSURE REGULATORS

A. Type: Single stage or two-stage designed to reduce tank pressure to LPG header pressure 34 kPa (5 psig). Outlet pressure shall be adjustable.

Design for LPG (propane) service. Valve shall be weatherproof for outside installation. Valve body shall be designed for 1724 kPa (250 psig). Provide internal relief valve set at 69 kPa (10 psig).

B. Performance: Valve shall provide steady outlet pressure of 34 kPa (5 psig) with flow rate required by igniters (pilots) furnished, with tank pressure variation from 1724 kPa to 138 kPa (250 psig to 20 psig).

2.19 STEAM TRAPS

A. Application: Steam line drip points and heat exchangers. Each type furnished by a single manufacturer.

B. Type: Inverted bucket type with thermostatic vent in bucket except closed float-thermostatic on discharge side of pressure reducing stations and on all heat exchangers. Refer to the drawings for trap locations, capacity and size, differential operating pressures, and design pressure.

C. Trap bodies: Steel, constructed to permit ease of removal and servicing working parts without disturbing connecting piping. The use of raised face flange is required on pipe sizes 1-1/2 inch and above. The use of unions is acceptable for pipe sizes below 1-1/2 inches. For systems without relief valve traps shall be rated for the pressure upstream of the steam supplying the system.

D. Floats: Stainless steel.

E. Valves: Hardened chrome-steel.

23 21 11 - 22

F. Mechanism and Thermostatic Elements: Stainless steel mechanisms.

Bimetallic strip air vent on inverted bucket traps.

G. Identification: Label each trap at the factory with an identification number keyed to number that is shown in contract documents. Label shall be a metal tag permanently affixed to the trap.

H. Factory-Packaged Trap Station: As an option for drip points requiring isolating valves, strainer, trap, check valves, trap monitoring device or ports for future monitoring device, and valved test ports, provide factory-packaged trap station including these features. The isolation valves, check valve, and strainer shall all be serviceable/maintainable, and the trap shall be line replaceable without removal of the factory-packaged trap station. All components of the package trap station shall meet individual component specifications specified elsewhere in this section.

2.20 FLEXIBLE CONNECTORS

A. Provide flexible connectors as shown to allow differential movements of pumps and piping systems subject to thermal expansion, to serve as vibration isolators between air compressors and piping systems, and to allow connection of steam or compressed air atomizing media for oil burners on water tube boilers.

B. Units for Compressed Air Service Only:

1. Service: Designed for 93 degrees C (200 degrees F), 1034 kPa (150 psig), and 15 mm (1/2 inch) intermittent offset.

2. Construction: Flexible corrugated stainless-steel hose wrapped with wire braid sheath. Provide threaded ends with union connectors.

C. Units for Atomizing Media Service (Steam, Compressed Air) and Steam

Safety Valve Drip Pan Ell Drains:

1. Service: Designed for saturated steam at set pressure of boiler safety valves or for set pressure of compressor relief valve, whichever is greater. Hose shall be designed for bend radii to suit location of connection points to burner piping system. Hose shall also be designed for intermittent flexing.

2. Construction: Flexible corrugated stainless-steel hose wrapped with wire braid sheath. Provide threaded ends with union connectors.

2.21 PIPING SUPPORT SYSTEMS

A. Provide an engineered piping support system with all hangers, supports and anchors designed and located by experienced technical pipe support

23 21 11 - 23 specialists, utilizing piping system design and analysis software. The system design shall be completely documented and submitted for review.

B. All pipe hangers and supports, and selection and installation shall comply with MSS SP-58 and MSS SP-127.

C. All pipe hanger and support devices shall be in compliance with specified MSS SP-58 type numbers, have published load ratings, and be products of engineered pipe support manufacturers.

D. All pipe stresses and forces and moments on connecting equipment and structures shall be within the allowances of the ASME B31.1, applicable building codes, and equipment manufacturer’s design limits.

E. Piping that expands and contracts horizontally including steam, steam condensate, boiler feed, condensate transfer, shall be supported by roller or sliding type hangers and supports except when long vertical hanger rods permit sufficient horizontal movement with the vertical angles of the rods less than 4 degrees.

F. Piping that expands and contracts vertically including steam, steam condensate, boiler feed, condensate transfer, shall be supported by engineered variable spring and spring cushion hangers. Utilize MSS SP-

58 selection requirements and guidelines. Vibration isolator hanger types are prohibited.

G. Piping system anchors shall be engineered and located to control movement of piping that is subject to thermal expansion.

H. Prior to construction, submit complete engineering calculation methods and results, descriptions of all devices with MSS numbers, sizes, load capabilities and locations. Submit calculations on all moments and forces at anchors and guides, all hanger loads, all pipe stresses that are within 20 percent of the code allowable or exceed ASME B31.1 code allowable, all pipe movements at supports.

I. Detailed Design Requirements:

1. Piping system design and analysis software shall be current state of the art that performs ASME B31.1 code analyses and shall be utilized to analyze pipe movement and deflection, pipe stresses, pipe support forces and moments, and for selection of pipe support types and sizes.

2. Each support for piping 65 mm (2-1/2 inches) and above shall be completely engineered to include location, type and size, hot and cold loads, and movement. Submit layout drawings showing precise

23 21 11 - 24 support locations and submit individual drawings for each support assembly showing all components, sizes, loadings.

3. Supports for piping 50 mm (2 inches) and below shall be engineered in general terms with approximate locations, typical support types and sizes, approximate movements. Submit layout drawings showing general locations and support types and sizes.

4. Obtain permissible loadings (forces and moments) for equipment nozzles (pipe connections) from the manufacturer of the boilers, the feedwater deaerator, and any other equipment as necessary.

Professional structural engineer shall verify capability of building structure to handle piping loads.

5. The project drawings shall show locations and types of resilient supports including rollers and springs, and shall also show special supports including anchors, guides, and braces. Comply with the drawing requirements unless it is determined that piping shall be overstressed or supports overloaded. Refer conflicts to the COR.

6. Variable spring hangers conforming the MSS SP-58, Type 51, shall support all piping that expands vertically from thermal effects which shall include connected equipment, such as boilers. Spring rates shall be selected to avoid excessive load transfer to the connected equipment as the piping expands vertically. Vibration-type spring isolators are prohibited. Light duty spring hangers, MSS SP-

58, Type 48, shall be utilized on loads of 91 kg (200 pounds) or less, and vertical movement of 3.2 mm (1/8 inches) or less. Spring cushion hangers, MSS SP-58, Type 49, shall be utilized for vertical movement of 3.2 mm (1/8 inches) or less.

7. Locate supports to permit removal of valves and strainers from pipelines without disturbing supports.

8. If equipment and piping arrangement differs from that shown in contract documents, support locations and types shall be revised at no cost or time to the Government. The Government will also require a complete stress analysis of the system as-built at no additional cost or time to the Government.

J. Hangers and Supports - Products:

1. Factory-built products of a manufacturer specializing in engineered pipe supports. All components shall have published load ratings. All spring type supports shall have published spring rates and movement limits. All support assemblies shall include threaded connections

23 21 11 - 25 that permit vertical position adjustment. Supports shall comply with

MSS SP-58 Type Numbers as listed below.

2. Upper Attachments to Building Structure: Types 18, 20, 21, 22, 23, 29, and 30.

3. Roller Supports: Types 41, 43, and 46. Provide vertical adjustment for Type 41 with threaded studs and nuts adjacent to the roller.

4. Variable Spring Hanger Assembly:

a. Type 51 variable spring, with Type 3 pipe clamp or Type 1 clevis.

Type 53 variable spring trapeze shall also be used. Locate Type

51 variable spring within 300 mm (1 foot) above pipe attachment.

Attach rod to top of variable spring with Type 14 clevis.

b. Typical features of variable spring hangers include spring rates under 150 lb/in, enclosed spring, load and travel indicator, sizes available with load capabilities ranging from 50 lb to multiples of 10,000 lb.

5. Spring Cushion Hanger Assembly: Double Rod: Type 41 and 49.

6. Light Duty Spring Hanger Assembly: Type 48 light duty spring, with

Type 3 pipe clamp or Type 1 clevis. Locate Type 48 light duty spring within 300 mm (1 foot) above pipe attachment.

7. Clevis Hangers: Type 1.

8. Wall Brackets: Type 31, 32, and 33.

9. Pipe Stands: Type 38.

10. Riser Clamps: Type 42.

11. Roller Guides: Type 44. Construct guides to restrain movement perpendicular to the long axis of the piping. All members shall be welded steel.

12. Trapeze Supports: Shall be used where pipes are close together and parallel. Construct with structural steel channels or angles. Bolt roller supports to steel to support piping subject to horizontal thermal expansion. Attach other piping with U-bolts.

13. Pipe Covering Protection Saddles: Type 39. Provide at all support points on insulated pipe except where Type 3 pipe clamp is provided.

Insulation shields are prohibited. Refer to Section 23 07 11, HVAC

AND BOILER PLANT INSULATION.

14. Sliding Supports: Type 35. Welded steel attachments to pipe and building structure with Teflon or graphite sliding surfaces bonded to the attachments. Provide steel guides, except at expansion bends, to prevent lateral movement of the pipe.

23 21 11 - 26

15. Piping Anchors: Provide engineered designs to accommodate the calculated loads.

2.22 PIPE AND VALVE FLANGE GASKETS

A. Non-asbestos, designed for the service conditions. On steam service utilize 3.2 mm (1/8 inch) thick Class 300 spiral-wound with Type 304 stainless steel and mica/graphite filler and carbon steel gauge ring.

2.23 THREAD SEALANTS

A. As recommended by the sealant manufacturer for the service. Teflon tape of any type is prohibited on fuel oil systems.

2.24 PIPE SLEEVES

A. Service: For pipes…