232111 Boiler Plant Piping Systems.pdf

09-01-22

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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.

B. A complete listing of common acronyms and abbreviations are included in

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

GENERATION.

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS.

B. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

C. Section 22 11 00 FACILITY WATER DISTRIBUTION.

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

GENERATION.

E. Section 23 07 11, HVAC AND BOILER PLANT INSULATION.

F. Section 23 50 11, BOILER PLANT MECHANICAL EQUIPMENT.

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 standard will govern. Use current version of the following documents:

B. American Society of Mechanical Engineers (ASME):

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

B16.5...................Pipe Flanges and Flanged Fittings: NPS 1/2

Through NPS 24 Metric/Inch Standard

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

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

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

Pressure Fittings

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

B31.1...................Power Piping

B31.9...................Building Services Piping

ASME Boiler and Pressure Vessel Code (BPVC):

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

BPVC Section VIIIRules for Construction of Pressure Vessels

BPVC Section IXWelding, Brazing, and Fusing Qualifications

C. ASTM International (ASTM):

A47/A47M................Standard Specification for Ferritic Malleable

Iron Castings

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

Seamless

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

Forgings for Piping Applications

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

Steel Pipe for High-Temperature Service

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

Stainless-Steel Bolting for High Temperature or

High-Pressure Service and Other Special Purpose

Applications

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

Steel, and Stainless-Steel Nuts for Bolts for

High Pressure or High-Temperature Service, or

Both

A197/A197M..............Standard Specification for Cupola Malleable

Iron

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

Temperature Service

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

Wrought Carbon Steel and Alloy Steel for

Moderate and High Temperature Service

A269/A269M..............Standard Specification for Seamless and Welded

Austenitic Stainless-Steel Tubing for General

ServiceAmerican Welding Society (AWS):

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

Performance Qualification

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

Processes

D. Manufacturers Standardization Society of the Valve and Fittings Industry (MSS):

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

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

Installation

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

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

Fittings – Socket Welding, Threaded, and

Buttwelding Ends

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

Dynamic Design, Selection, and Application

E. National Fire Protection Association (NFPA):

54......................National Fuel Gas Code

F. Pipe Fabrication Institute (PFI):

ES24....................Pipe Bending Methods, Tolerances, Process and

Material Requirements

G. Department of Veterans Affairs (DVA):

H-18-8..................Seismic Design Handbook

1.4 SUBMITTALS

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

SAMPLES.

B. Information and material submitted under this section will be marked “SUBMITTED UNDER SECTION 23 21 11, BOILER PLANT PIPING SYSTEMS”, with applicable paragraph identification.

C. Manufacturer's Literature and Data: Submission will include full item description optional features, and accessories. Include dimensions, weights, 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, and Flanges:

a. ASTM material specification number.

b. ASME standards number.

c. Catalog cuts.

d. Pressure and temperature ratings.

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e. Intended service.

3. Valves - Gate, Globe, Check, Plug, and 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, and 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.

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. Steam Traps:

a. Catalog cuts showing design and construction.

b. Service limitations (maximum pressures and temperatures).

c. Materials of construction.

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d. Flow rates at differential pressures shown on drawings.

e. Orifice size for each trap.

f. Monitoring equipment or attachments

9. 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.

10. Pipe Support Systems: The contractor will 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.

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.

j. Stress analyses on the boiler plant piping systems under all possible load conditions as part of the design. Once all piping is completed another stress analysis is required on the as built

23 21 11 - 6 systems. Documentation results will flag locations/components requiring recommended revision/modification to obtain acceptable stress levels.

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 will have their terminals identified to facilitate installation, operation and maintenance.

E. Submit training plans and instructor qualifications.

1.5 QUALITY ASSURANCE

A. Entire installation will 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 will conform to the referenced codes and standards as required by the specifications. Local codes and amendments will be enforced, along with requirements of local utility companies. The most stringent requirements of these specifications, local codes, or utility company requirements will always apply. Any conflicts will be brought to the attention of the COR.

D. Welding Qualifications: Before any welding is performed, contractor will 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 for power piping and ASME B31.1 for service piping.

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 will be stamped according to the provisions of the American Welding Society.

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E. ASME Compliance: Comply with ASME B31.9 for power piping and ASME B31.1 for service piping materials, products, and installation. Safety valves and pressure vessels will bear appropriate ASME labels.

1.6 DELIVERY, STORAGE AND HANDLING

A. All piping will be stored and kept free of foreign material and will 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 must 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. Maximum pressure capability of steam systems between boilers and through first pressure reducing valve protected by a safety valve will 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 will 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 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 will 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 and equipment are applied to prevent failure under gas pressure 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

23 21 11 - 8 temperatures of 54 degrees C (130 degrees F), and pressures of 1034 kPa

(150 psig).

G. 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.

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

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

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

1.8 AS-BUILT DOCUMENTATION

A. Submit manufacturer’s literature and data updated to include submittal review comments and any equipment substitutions.

B. Submit operation and maintenance data updated to include submittal review comments, VA approved substitutions and construction revisions will be in electronic version on CD or DVD inserted into a three-ring binder. All aspects of system operation and maintenance procedures, including applicable piping isometrics, wiring diagrams of all circuits, a written description of system design, control logic, and sequence of operation will be included in the operation and maintenance manual. The operations and maintenance manual will include troubleshooting techniques and procedures for emergency situations.

Notes on all special systems or devices will be included. A List of recommended spare parts (manufacturer, model number, and quantity) will be furnished. Information explaining any special knowledge or tools the owner will be required to employ will be inserted into the As-Built documentation.

C. The installing contractor will maintain as-built drawings of each completed phase for verification; and will provide the complete set at the time of final systems certification testing. Should the installing contractor engage the testing company to provide as-built or any portion thereof, it will not be deemed a conflict of interest or breach of the ‘third party testing company’ requirement. Provide record drawings as follows:

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1. Red-lined, hand-marked drawings are to be provided, with one paper copy and a scanned PDF version of the hand-marked drawings provided on CD or DVD.

D. Certification documentation will be provided to COR 21 working days prior to submitting the request for final inspection. The documentation will include all test results, the names of individuals performing work for the testing agency on this project, detailed procedures followed for all tests, and provide documentation/certification that all results of tests were within limits specified. Test results will contain written sequence of test procedure with written test results annotated at each step along with the expected outcome or setpoint. The results will include all readings, including but not limited to data on device

(make, model and performance characteristics), normal pressures, switch ranges, trip points, amp readings, and calibration data to include equipment serial numbers or individual identifications, etc.

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 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:

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1. 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.

2. Flange Face Type must match the mating flange that it will be mated with.

3. Gasket material non-asbestos gasket will either be stainless steel spiral wound strip with flexible graphite filler or compressed inorganic fiber with nitrile binder rated for saturated and superheated steam service 400 degrees C (750 degrees F) and 10,342 kPa (1500 psig). Gasket material will cover the full face of smooth face flanges.

4. Bolts will be high strength steel ASTM A193/A193M, Class 2, Grade

B7.

5. Nuts will 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.

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).

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2.3 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 will be Schedule 80;

welded joints Schedule 40. No joining of different schedule pipe in order to have welded on one end and threaded on the other. In these cases, the length of pipe will be Schedule 80.

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 will be High strength ASTM

A193/A193M, Class 2, Grade B7. Nuts will be ASTM A194/A194M.

2.4 BOILER BLOWOFF PIPING

A. From boiler bottom blowoff connection to blowoff tank. Connections between boiler accessories drain valves and blowoff lines.

B. Pipe: Carbon steel, ASTM A106/A106M, Grade B, seamless, Schedule 80.

C. Joints: Butt-welded, no other types are allowed.

D. Fittings: Steel, ASTM A234/A234M, Grade B, ASME B16.9, same schedule as adjoining pipe, all elbows long radius. Tees or crosses are prohibited.

E. Flanges: Forged steel weld neck, ASME B16.5, ASTM A105/A105M, 2070 kPa (300 psig).

F. At no point will the bottom blow down lines rise above the point of connection to the boiler.

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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.

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 pipe will use only soldered fittings.

2.8 BOILER WATER SAMPLING, CONTINUOUS BLOWDOWN

A. Pipe: Steel, ASTM A106/A106M Grade B, seamless, Schedule 80.

B. Joints: Threaded.

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

Fittings between boiler and first stop valve must be forged steel, ASME

B16.11, 13,790 kPa (2000 psig) or 20,685 kPa (3000 psig) class.

D. Unions: Malleable iron, 2070 kPa (300 psig) class.

2.9 FEEDWATER SAMPLING AND CHEMICAL FEED PIPING

A. Pipe: Stainless steel tubing, ASTM A269/A269M, Type 316.

B. Fittings: Stainless steel Type 316 welding fittings.

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2.10 MISCELLANEOUS PIPING

A. Instrument and Control Piping (Sensing Point to Transmitter, Controller, or Other Instrument): Construction will 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.

C. Pump Recirculation:

1. Pipe: Carbon steel, ASTM A53/A53M Grade B or ASTM A106/A106M Grade B, seamless or ERW, double extra strong. Schedule 40 permitted on all lines 1500 mm (5 feet) or more from the recirculation orifice.

2. Joints: Threaded.

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

or malleable iron, ASTM A47/A47M or ASTM A197/A197M, ASME B16.3, 2070 kPa (300 psig) class, except 1034 kPa (150 psig) class permitted on all lines 1500 mm (5 feet) or more from the recirculation orifice.

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

(3000 psig) class; or malleable iron, ASTM A47/A47M or ASTM

A197/A197M, same pressure class as nearest fittings.

2.11 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 will be rated for 690 kPa (100 psig), 27 degrees C (80 degrees F). Fittings on steam condensate lines will be rated at 520 kPa (75 psig), 121 degrees C (250 degrees F). Fittings on other services will be rated for the maximum pressure and temperature conditions of the service.

2.12 VALVES; GATE, GLOBE, PLUG, CHECK, BALL, 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 will 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

23 21 11 - 14 conditions. Pressure-temperature ratings listed are minimum requirements. Packing and gaskets will not contain asbestos.

B. Valve Type Designations:

1. Gate Valves:

a. Type 101: Cast steel body ASTM A216/A216M WCB, 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 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.

d. Type 105: 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 Class 5515 kPa (800 psig), hardened stainless steel or Stellite wedge and seats, threaded ends, OS&Y, rising stem, bolted bonnet.

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2. Globe Valves:

a. Type 201: Cast steel body ASTM A216/A216M WCB, 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, rated for 2070 kPa at 216 degrees C (300 psig at 420 degrees F) minimum, Class 4138 kPa (600 psig) or Class 5515 kPa (800 psig), 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.

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

23 21 11 - 16 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.

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. 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.

23 21 11 - 17

C. Boiler Valves:

1. Steam Non-Return Stop Check Valves:

a. Type: Straight-way Y-pattern, with dash-pot and piston and tapped drain openings, OS&Y, bolted bonnet, rising stem. Provide angle pattern only if shown on the contract drawings.

b. Construction: Cast steel body ASTM A216/A216M WCB, rated for 2070 kPa (300 psig) saturated steam, Stellite faced steel disc, alloy steel seat, 2070 kPa (300 psig) ASME flanged ends.

c. Operation: Valves will automatically close tightly when boiler steam pressure becomes less than that of the steam header. Valves will operate without sticking or chattering.

2. Stop Valves for Steam Vents on Boiler Drums and Steam Lead, Steam Pressure Gauge:

a. Installation of steam pressure gauge shut-off valves will conform to ASME BPVC, Section I.

b. Angle stop valves (water tube boilers), OS&Y, chain operated, cast, or forged steel, 1380 kPa (200 psig) steam rating, renewable seat and disc.

c. Gate valves, two inches and under: Type 105.

3. Valves in Drain Lines from Steam Stop Check Valve, Water Column, Gauge Glass, Low Water Cut-offs:

a. Gate valves, two inches and under: Type 105.

b. Check valves, two inches and under: Type 405.

4. Bottom Blowoff Valves:

a. Type: Seatless, sliding plunger, 0S&Y, designed for blowoff service. Sliding disc-type or globe-type valves are prohibited.

b. Construction: ASTM A216/A216M WCB cast steel body, rated for 2070 kPa (300 psig) saturated steam, 2070 kPa (300 psig) ANSI flanged ends. Valves will have handwheel with rotating handle.

c. Conform to ASME B31.1.

D. Steam above 103 kPa (15 psig), all valves in steam pressure reducing stations:

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

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

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

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

5. Ball valves, 50 mm (2 inches) and under: Type 503.

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

23 21 11 - 18

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

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. Ball valves, 50 mm (2 inches) and under: Type 503.

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

F. 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.

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

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

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

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

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

H. Boiler Water Sampling, Continuous Blowdown:

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

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

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

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

5. Continuous Blowdown Flow Control Valve: Forged steel angle-type body, rated for 2070 kPa at 288 degrees C (300 psig at 550 degrees

F), hardened stainless steel disc and seat, threaded ends, rising stem, union bonnet, graduated micrometer-type dial and pointer showing amount of valve opening. Furnish valve blowdown chart

23 21 11 - 19 showing flow rate versus valve opening based on 861 kPa (125 psig) boiler drum pressure.

I. Feedwater Sampling:

1. Ball valves, 50 mm (2 inches) and under: Type 501.

2. Check valves, 50 mm (2 inches) and under: Type 406.

J. Chemical Feed System:

1. Ball valves, 50 mm (2 inches) and under: Type 501.

2. Check valves, 50 mm (2 inches) and under: Type 406.

K. 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.

L. 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.

M. 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.

N. 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. May be applied where plug valves are shown.

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.

23 21 11 - 20

O. Compressed Air:

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

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

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

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

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

S. Non-Boiler Blowdowns, Drains, Flow Sensing Lines:

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

2. Ball valves, 50 mm (2 inches) and under: Type 503.

2.13 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 will 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 will be psig.

2.14 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 on the drawings. Where provided, rotor will 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 will 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 - 21 indicator. Shield will fit the indicator tightly and be suitable for

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

2.15 QUICK-COUPLE HOSE CONNECTORS AND STEAM HOSES

A. Provide on all Y-strainer drains and where 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 must 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.

2.16 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 will comply with ASME BPVC

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

(NB).

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

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

EQUIPMENT.

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

MECHANICAL EQUIPMENT.

E. 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 - 22

2.17 STEAM PRESSURE REDUCING VALVES

A. Type: Single-seated, diaphragm operated, spring-loaded, steam pilot-controlled, normally closed, pack-less, adjustable set pressure. Pilot will sense controlled pressure downstream of main valve.

B. Service: Provide controlled reduced pressure to steam piping systems.

Design for saturated steam at pressures shown on drawings or equipment requirements.

C. Performance: Pressure control will be smooth, continuous. Maximum 10 percent deviation from set pressure over an 10/1turndown. Refer to schedules on drawings for flow and pressure requirements. Downstream safety valve will be sized equal to or exceed the maximum total flow capacity of the pressure reducing station.

D. Construction:

1. Main Valve – Pipe sizes 50 mm (2 inches) and less: Steel body rated for 1724 kPa (250 psig), threaded ends. Globe body valve and seat will be replaceable, Type 316 stainless steel and include stainless steel stem.

2. Main Valves – Pipe sizes greater than 50 mm (2 Inches): Steel body rated for 1034 kPa (150 psig), ASME flanged ends, or steel body 1724 kPa (250 psig) ASME flanged ends. Globe body valve and seat will be replaceable, Type 316 stainless steel and include stainless steel stem.

3. Pilot Valve: Valve plug and seat will be replaceable, stainless steel or Monel.

2.18 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.

23 21 11 - 23

2.19 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.

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 will 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 will 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.

23 21 11 - 24

2.20 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 1½ inch and above. The use of unions is acceptable for pipe sizes below 1½ inches. For systems without relief valve traps will be rated for the pressure upstream of the steam supplying the system.

D. Floats: Stainless steel.

E. Valves: Hardened chrome-steel.

F. Mechanism and Thermostatic Elements: Stainless steel mechanisms.

Bimetallic strip air vent on inverted bucket traps.Identification:

Label each trap at the factory with an identification number keyed to number that is shown on the drawings. Label will be a metal tag permanently affixed to the trap.

Factory-Packaged Trap Station: As an option for drip points requiring isolating valves, strainer, trap, trap monitoring device or ports for future monitoring device, and valved test ports, provide factory-packaged trap station including these features.

2.21 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 Water Service:

1. Service: Refer to schematic diagrams for pressure, temperature and movement requirements. If requirements are not shown on the drawings, units will be designed for maximum system pressure, temperature, axial movement and lateral movement.

23 21 11 - 25

2. Construction:

a. Teflon Bellows Type: Molded Teflon bellows with metal reinforcing rings, flanged ends, bolted limit rods.

b. Stainless Steel Bellows Type: Multi-ply stainless steel with flanged ends, bolted limit rods.

c. Flexible Metal Hose Type: Corrugated stainless-steel hose wrapped with wire braid sheath. Ends will be threaded, with union connectors, for pipe sizes 50 mm (2 inches) and below, flanged for pipe sizes 65 mm (2-1/2 inches) and greater.

C. 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.

D. 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 will be designed for bend radii to suit location of connection points to burner piping system. Hose will also be designed for intermittent flexing.

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

2.22 PIPING SUPPORT SYSTEMS

A. Provide an engineered piping support system with all hangers, supports and anchors designed and located by experienced technical pipe support specialists, utilizing piping system design and analysis software. The system design must be completely documented and submitted for review.

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

C. All pipe hanger and support devices will 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 will 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, will be supported by

23 21 11 - 26 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, will 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. Seismic braces and shock absorbers will be provided. Comply with MSS SP-127 design requirements and guidelines. Piping will remain fully connected and supported under the design seismic events.