23 22 26.00 20.pdf

NUWC P-084 AMENDMENT 006

NEWPORT NAVAL STATION, NEWPORT, RI OCTOBER 2026

SECTION 23 22 26.00 20

STEAM SYSTEM

02/10, CHG 1: 05/15

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

ASME A13.1 (2020) Scheme for the Identification of Piping Systems

ASME B1.1 (2003; R 2018) Unified Inch Screw Threads (UN and UNR Thread Form)

ASME B1.20.1 (2013; R 2018) Pipe Threads, General Purpose (Inch)

ASME B16.3 (2021) Malleable Iron Threaded Fittings, Classes 150 and 300

ASME B16.5 (2020) Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24 Metric/Inch Standard

ASME B16.9 (2018) Factory-Made Wrought Buttwelding Fittings

ASME B16.11 (2022) Forged Fittings, Socket-Welding and Threaded

ASME B16.18 (2021) Cast Copper Alloy Solder Joint Pressure Fittings

ASME B16.20 (2017) Metallic Gaskets for Pipe Flanges

ASME B16.21 (2021) Nonmetallic Flat Gaskets for Pipe Flanges

ASME B16.22 (2021) Wrought Copper and Copper Alloy Solder Joint Pressure Fittings

ASME B16.24 (2022) Cast Copper Alloy Pipe Flanges, Flanged Fittings, and Valves Classes 150, 300, 600, 900, 1500, and 2500

ASME B16.34 (2021) Valves - Flanged, Threaded and Welding End

ASME B16.39 (2020) Standard for Malleable Iron Threaded Pipe Unions; Classes 150, 250, and 300

SECTION 23 22 26.00 20 Page 1

ASME B18.2.1 (2012; Errata 2013) Square and Hex Bolts and Screws (Inch Series)

ASME B18.2.2 (2022) Nuts for General Applications:

Machine Screw Nuts, and Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)

ASME B31.1 (2022) Power Piping

ASME B40.100 (2022) Pressure Gauges and Gauge Attachments

ASME BPVC (2010) Boiler and Pressure Vessels Code

ASME BPVC SEC IX (2017; Errata 2018) BPVC Section IX-Welding, Brazing and Fusing Qualifications

ASME BPVC SEC VIII D1 (2019) BPVC Section VIII-Rules for Construction of Pressure Vessels Division 1

AMERICAN WELDING SOCIETY (AWS)

AWS Z49.1 (2021) Safety in Welding and Cutting and Allied Processes

ASTM INTERNATIONAL (ASTM)

ASTM A53/A53M (2022) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A106/A106M (2019a) Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A193/A193M (2024a) Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service and Other Special Purpose Applications

ASTM A194/A194M (2023) Standard Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High-Pressure or High-Temperature Service, or Both

ASTM A276/A276M (2024) Standard Specification for Stainless Steel Bars and Shapes

ASTM A307 (2021) Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength

ASTM A312/A312M (2022a) Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

ASTM A351/A351M (2024) Standard Specification for Castings, Austenitic, for

SECTION 23 22 26.00 20 Page 2

Pressure-Containing Parts

ASTM B32 (2020) Standard Specification for Solder Metal

ASTM B88 (2022) Standard Specification for Seamless Copper Water Tube

COPPER DEVELOPMENT ASSOCIATION (CDA)

CDA A4015 (2016; 14/17) Copper Tube Handbook

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS

INDUSTRY (MSS)

MSS SP-45 (2020) Bypass and Drain Connections

MSS SP-58 (2018) Pipe Hangers and Supports - Materials, Design and Manufacture, Selection, Application, and Installation

MSS SP-69 (2003; Notice 2012) Pipe Hangers and Supports - Selection and Application (ANSI Approved American National Standard)

MSS SP-72 (2010a) Ball Valves with Flanged or Butt-Welding Ends for General Service

MSS SP-80 (2019) Bronze Gate, Globe, Angle and Check Valves

MSS SP-110 (2010) Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA ICS 2 (2000; R 2020) Industrial Control and Systems Controllers, Contactors, and Overload Relays Rated 600 V

NEMA ICS 6 (1993; R 2016) Industrial Control and Systems: Enclosures

NEMA MG 1 (2021) Motors and Generators

U.S. DEPARTMENT OF DEFENSE (DOD)

MIL-DTL-18436 (2017; Rev G) Valves, Check, Bronze, Cast Iron, and Steel Body

U.S. GENERAL SERVICES ADMINISTRATION (GSA)

CID A-A-1689 (Rev B) Tape, Pressure-Sensitive Adhesive, (Plastic Film)

CID A-A-50558 (Basic; Notice 1) Valves, Pressure Regulating, Steam

SECTION 23 22 26.00 20 Page 3

CID A-A-50568 (Basic; Notice 1) Gages, Liquid Level Measuring, Tank

CID A-A-59617 (Basic, Notice 1) Unions, Brass or Bronze, Threaded Pipe Connections and Solder-Joint Tube Connections

CID A-A-60001 (Rev A) Traps, Steam

FS F-P-2908 (Basic; Notice 1) Pumping Units, Condensate, Return; and Boiler Feed Package

FS F-V-2906 (Basic; Notice 1) Valves, Air Venting, Steam

FS QQ-B-654 (Rev A; Notice 1; Notice 2) Brazing Alloys, Silver

FS WW-H-191 (Rev E; Notice 2) Heater, Fluid, Industrial (Instantaneous, Steam, Water Converter Type)

FS WW-S-2739 (Basic; Notice 1; Notice 2) Strainers, Sediment: Pipeline, Water, Air, Gas, Oil, or Steam

1.2 GENERAL REQUIREMENTS

Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS, applies to this section, with the additions and modifications specified herein. This section includes steam and condensate piping, converters, and condensate return units used for heating within the building.

1.2.1 Classes and Maximum Working Pressures

Equipment, piping, and piping components shall be suitable for use under the maximum working pressure indicated. Except as modified herein, the pressure temperature limitations shall be as specified in the referenced standards and specifications.

1.2.2 Standard Commercial Product

The condensate return units provided shall, as a minimum, comply with the features specified herein and shall be the manufacturer's standard commercial product. A standard commercial product is a product which has been sold or is currently being offered for sale, on the commercial market through advertisements or manufacturer's catalogs or brochures.

1.2.3 Welding Safety

AWS Z49.1 .

1.2.4 Definitions

1.2.4.1 High Pressure Piping System

A system whose pressure is greater than 15 psig and shall conform to

ASME B31.1 .

SECTION 23 22 26.00 20 Page 4

1.2.4.2 Low Pressure Piping System

A system whose pressure is 15 psig or less.

1.2.4.3 Piping and Piping System

Includes pipe, tubing, flanges, bolting, gaskets, valves, safety valves, fittings, and pressure containing parts of other piping components, hangers, supports, guides, expansion joints , anchors, and other equipment items necessary to prevent overstressing the pressure containing parts.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-03 Product Data

Converters ; G

Condensate Return Pumping Units ; G

Valves ; G

Valve Operating Mechanism ; G

Steam Meters ; G

Traps ; G

Traps ; G

Strainers ; G

Expansion Joints ; G

Instrumentation ; G

SD-06 Test Reports

Steam Piping ; G tests

Copper Tubing ; G test

Valves ; G tests

Expansion Joints ; G tests

Instrumentation ; G tests

Pipe and Pipe System ; G

Converters tests

Condensate Return Pumping Units ; G tests

Submit reports of tests required by the reference specification

SECTION 23 22 26.00 20 Page 5 and standards.

SD-07 Certificates

Welding Procedure ; G

Welder's Performance Qualification Record ; G

List of Welders and Welder's Symbols ; G

SD-08 Manufacturer's Instructions

Converters ; G

Condensate Return Pumping Units ; G

Include manufacturer's recommendations for equipment foundations.

1.4 QUALITY ASSURANCE

1.4.1 Welding Procedure

Submit welding procedure specification for metals included in the work, together with proof of the procedure's qualifications as outlined in

ASME B31.1 .

1.4.2 Welder's Performance Qualification Record

Submit the Welder's Performance Qualification Record in conformance with ASME B31.1 for each welder, showing that the welder was tested under the approved procedure specification submitted by the Contractor. In addition, submit list of welders and welder's symbols , assigned number, or letter which shall be used to identify the work of the welder which shall be affixed immediately upon completion of the weld. Welders making defective welds after passing a qualification test shall be required to take a requalification test. Welders failing the requalification tests will not be permitted to work under this contract.

1.4.3 Previous Qualifications

Welding procedures, welders, and welding operators previously qualified by test may be accepted for this contract without requalification subject to approval if the conditions specified in ASME B31.1 are met before a procedure can be used.

PART 2 PRODUCTS

2.1 PIPE AND PIPE SYSTEM

2.1.1 High Pressure Steam Piping System (Over 15 psig)

ASME B31.1 for a steam working pressure of 65 psig and temperature of 312 degrees F, and a condensate pressure of 50 psig and temperature of 298 degrees F.

2.1.1.1 High Pressure Steam Piping

ASTM A106/A106M or ASTM A53/A53M, Grade B, Schedule 80, black steel, electric-resistance welded or seamless. Use ASTM A53/A53M pipe for

SECTION 23 22 26.00 20 Page 6 bending.

2.1.1.2 Discharge Piping for Steam Relief Valves

ASTM A106/A106M or ASTM A53/A53M, Grade B, Schedule 40, black steel, seamless. Use ASTM A53/A53M pipe for bending.

2.1.2 Low Pressure Steam Piping System

ASME B31.1 for a steam working pressure of 15 psig or less, a condensate pressure of 40 psig, and a temperature of 250 degrees F.

2.1.2.1 Low Pressure Steam Piping

a. Steel Piping: ASTM A53/A53M, Schedule 40, black, electric-resistance welded or seamless. Use ASTM A53/A53Mpipe for bending.

b. Copper Tubing : ASTM B88, Type K.

2.1.2.2 Vent Piping for Condensate Receivers

In Mechanical Rooms: ASTM A106/A106M or ASTM A53/A53M, Grade B, Schedule 40, black steel, seamless. Use ASTM A53/A53M pipe for bending.

In Riser Shafts, and Through Outside Wall or Through and Above Roof:

ASTM A312/A312M , Grade TP304, Schedule 40, stainless steel, seamless.

2.1.3 Condensate Return Piping (100 psig or Less)

2.1.3.1 Steel Piping

ASTM A106/A106M or ASTM A53/A53M, Grade B, Schedule 80, black, electric-resistance welded or seamless.

2.1.3.2 Copper Tubing (15 psig or Less)

ASTM B88, Type K.

2.1.4 Fittings

Provide fittings compatible in all respects (material, size, pressure, and temperature limitations) with the pipe being used and within any further limitations of ASME B31.1 .

2.1.4.1 Fittings for Steel Pipe

a. Sizes 1/8 to 2 inches:

(1) Steel Fittings: ASME B16.11 , socket welding or threaded. Where pressure exceeds 15 psig, provide socket-welding type only.

(2) Malleable Iron Fittings: ASME B16.3 , threaded.

b. Sizes 2 1/2 inches and larger:

(1) Steel Fittings: ASME B16.9 , buttwelding or ASME B16.5 , flanged.

(2) Bronze Fittings: ASME B16.24 , flanged. Sizes larger than 8 inches are not permitted.

SECTION 23 22 26.00 20 Page 7

2.1.4.2 Fittings for Stainless Steel Pipe

a. Sizes 1/8 to 2 inches: ASME B16.11 , socket welding or threaded. Where pressure exceeds 15 psig, provide socket-welding type only.

b. Sizes 2 1/2 inches and larger: ASME B16.9 , buttwelding or ASME B16.5 , flanged.

2.1.4.3 Fittings for Copper Tubing

ASME B16.18 , cast copper alloy or ASME B16.22 , wrought copper, solder joint type. Flared or compression joint type fittings for tube sizes not exceeding 2 inches outside diameter (O.D.) may be provided as permitted in

ASME B31.1 .

2.1.5 Unions

2.1.5.1 Unions for Steel Pipe

ASME B16.39 , threaded.

2.1.5.2 Unions for Copper Tubing

CID A-A-59617 , solder joint end type.

2.1.6 Flanges

Remove the raised faces on flanges when used with flanges having a flat face.

2.1.6.1 Steel Flanges

ASME B16.5 , forged steel, welding type.

2.1.6.2 Bronze Flanges

ASME B16.24 , threaded.

2.1.7 Valves

Shall conform to the following paragraphs. End connections shall conform to paragraph END CONNECTIONS.

2.1.7.1 Gate Valves

a. Bronze Gate Valves: MSS SP-80 , Type 1 (solid wedge, non-rising stem) or Type 2 (solid wedge, inside screw, rising stem), 3 inches and smaller, threaded or solder joint ends, and not less than Class 150.

b. Steel Gate Valves: ASME B16.34 . Provide outside screw and yoke type with solid wedge or flexible wedge disc, and with trim suitable for the service temperature and pressure.

2.1.7.2 Globe and Angle Valves

a. Bronze Globe and Angle Valves: MSS SP-80 , Type 1 (metal disc, integral seat) or Type 3 (metal disc, renewable seat), 3 inches and

SECTION 23 22 26.00 20 Page 8 smaller, threaded or solder joint ends, Class 200 except that Class 150 with solder joint ends may be used for copper tubing. Valves shall have renewable seats and discs, except solder joint end valves which shall have integral seats.

b. Steel Globe and Angle Valves: ASME B16.34 , with trim suitable for the service temperature and pressure.

2.1.7.3 Ball Valves

a. Stainless Steel Ball Valves: MSS SP-72 for flanged valves and MSS SP-110 for screwed-end valves, 2-part bolted body rated for service at not less than 250 psig at 500 degrees F, Class 300 minimum construction FOR STEAM SERVICE AND Class 150 for condensate. For valve bodies in sizes 2 inches and larger, use flanged-end connection type. Body and retainer of ASTM A351/A351M alloy. Full-port ball of ASTM A351/A351M alloy or ASTM A276/A276M Type 316 stainless steel.

Stem, springs, adjustable packing gland, and lever-type or other handle of Type 316 stainess steel. Bolts and studs of ASTM A193/A193M stainless steel. Stem and bolting nuts of corrosion-resistant steel suitable for wet-location use. Seats and bearings fabricated from Polyetheretherketone (PEEK) or more heat-resistant material, and seals and packing of graphite..

2.1.7.4 Check Valves

a. Bronze Check Valves: MSS SP-80 , Type 3 (swing check, metal disc to metal seat), 3 inches and smaller, threaded or solder joint ends, Class 200, regrinding type.

b. Steel Check Valves: MIL-DTL-18436 , with trim suitable for the service temperature and pressure.

(1) Swing Check Valves: Shall have bolted caps.

(2) Lift Check Valves: Shall have threaded or bolted caps.

(3) Piston Check Valves 800Lb Rated for 1975 psig @ 100°F.: Shall have threaded, ASME B1.20.1 or Socket Welded End Connections ASME B16.25.

2.1.7.5 Steam Pressure Reducing Valves

CID A-A-50558 , balanced construction, main spring isolated from steam, stainless steel multiple sheet diaphragm, single seat regulator, in-line maintenance, with self-contained spring-operated external pilot, cast iron prohibited.

2.1.7.6 Air Vent Valves

FS F-V-2906 , without vacuum holding device, pressure rated for the intended service, and with a capacity as recommended by the manufacturer based on heat exchanger size, cast iron prohibited.

2.1.7.7 Triple-Offset Butterfly Valves

Provide triple-off set buttefly valves, 300 LB, 2" through 8" where indicated on the plans. Valve will be rate for zero leakage per API 6D and API 598 resilent in both directions. Reated design conditions will exceed 500°F at 150 psig.

SECTION 23 22 26.00 20 Page 9

2.1.7.8 Valve Operating Mechanism

Provide floor stands, chainwheels, and extension stems where indicated, where required for successful system operation including maintenance shutdowns and repairs, and as specified.

a. Floor Stands: Shall be cast iron or steel, constructed for bolting to the floor and shall include an extension stem, an operating handwheel, and a position indicator for non-rising stems. Floor stand shall be not less than 30 inches high. Handwheel shall identify rotation direction for closing the valve and shall be of such diameter as to permit operation of the valve with a force of not more than 40 pounds.

b. Chainwheel Operator: Shall be fabricated of cast iron or steel and shall include a wheel, an endless chain, and a guide to keep the chain on the wheel. Provide galvanized steel endless chain extending to within 3 feet of the floor.

c. Extension Stem: Shall be corrosion resisting steel designed for rising and non-rising stems, as applicable, and for connection to the valve stem by a sleeve coupling or universal joint. Provide in length required to connect the valve stem and the operating mechanism and of sufficient cross section to transfer the torque required to operate the valve.

2.1.7.9 Safety Valves

MIL-DTL-18436 , Type 1, sized in accordance with ASME BPVC. Set point shall be as indicated, cast iron prohibited. Provide drip pan elbow from the safety valve manufacturer, designed to fasten directly to the safety valve outlet.

2.1.8 End Connections

2.1.8.1 Steel Piping

Sizes 2 inches and smaller threaded or socket welded; sizes 2 1/2 inches and larger flanged or butt welded.

a. Threaded Joints: ASME B1.20.1 .

b. Flanged Joints: Flanges shall conform to paragraph entitled "Flanges." Bolting and gaskets shall be as follows:

(1) Bolting: Material used for bolts and studs shall conform to ASTM A307, Grade B; and material for nuts shall conform to ASTM A194/A194M , Grade 2. Dimensions of bolts, studs, and nuts shall conform to ASME B18.2.1 and ASME B18.2.2 with threads conforming to ASME B1.1 coarse type, with Class 2A fit for bolts and studs, and Class 2B fit for nuts. Bolts or bolt-studs shall extend completely through the nuts and may have reduced shanks of a diameter not less than the diameter at root of threads. Carbon steel bolts shall have American Standard regular square or heavy hexagon heads and shall have American Standard heavy semifinished hexagonal nuts, conforming to ASME B18.2.1 and ASME B18.2.2 .

(2) Gaskets: Gaskets shall be as follows:

SECTION 23 22 26.00 20 Page 10

Working Conditions Material

Saturation

120 psig 350 degrees F Composition or Copper

Superheated Steam, Less Than 750 degrees F

120 psig 400 degrees F Metal-Jacketed Composition, Monel, Steel, or Soft Steel

Gaskets shall be as thin as the finish of surfaces will permit. Metal or metal-jacketed non-asbestos gaskets shall be used with small male and female or small tongue-and-groove flanges or flanged fittings;

they may be used with steel flanges with lapped, large male and female, large tongue-and-groove, or raised faces. Full faced gaskets shall be used with flat-faced bronze flanges. Lapped steel flanges, or raised-face steel flanges shall have ring gaskets with an outside diameter extending to the inside of the bolt holes. Widths of gaskets for small male and female and for tongue-and-groove joints shall be equal to the widths of the male face or tongue. Gaskets shall have an inside diameter equal to or larger than the port openings. Rings for ring joints shall be in accordance with dimensions in ASME B16.20 , suitable for the service conditions encountered, and shall be softer than the flanges. Dimensions for non-metallic gaskets shall be in accordance with ASME B16.21 .

c. Butt Weld Joints: ASME B31.1 . The use of backing rings shall conform to ASME B31.1 . Ferrous rings shall be of good weldable quality and shall not exceed 0.05 percent sulfur; for alloy pipe, backing rings shall be of material compatible with the chemical composition of the parts to be welded and preferably of the same composition. Backing rings shall be continuous machined or split band type.

d. Socket Weld Joints: ASME B31.1 .

2.1.8.2 Joints for Copper Tubing

a. Solder Joints: ASTM B32, alloy grade Sb5 solder for steam pressure 15 psig or less.

b. Brazed Joints: FS QQ-B-654 for steam pressure 120 psig or less.

2.1.9 Instrumentation

2.1.9.1 Pressure and Vacuum Gages

ASME B40.100 Grade B or better, with restrictor, locate as indicated.

Provide gauges with 4 1/2 inch dial, glass window, stainless steel or aluminum case, and bronze tube. Provide scale range for intended service. Scale range not to exceed two times (2X) the indicated pressure of piping, selected so that at normal operating pressure, the needle is within the middle-third of the range.

2.1.9.2 Tank Gages

CID A-A-50568 , locate as indicated.

SECTION 23 22 26.00 20 Page 11

2.1.9.3 Indicating Thermometers

Thermometers shall be vapor-actuated dial type with an adjustable angle suitable for the service. Construction shall be stainless-steel case with molded glass or polycarbonate cover, stainless-steel stem and bulb. Stem shall be straight, length as required to fit well. Dial scale diameter shall be 3 1/2 inches. Case shall be hermetic, with polycarbonate or glass window and rubber ring. For thermowells located more than 7 feet above finished floor, provide remote element with capillary tube protected with braided copper alloy, and mount the dial at 4 to 6 feet above the floor. Provide thermowell sized for each thermometer in accordance with the thermowell specification.

Thermowells shall have 1/2 or 3/4 inch NPT connection, brass or stainless steel. Extended neck thermal wells shall be of sufficient length to clear insulation thickness by 1 inch.

Provide viscous thermal transfer fluid to fill wells.

2.1.10 Miscellaneous Pipeline Components

2.1.10.1 Steam Meters

Variable Orifice Steam Meters

a. Provide spring loaded variable orifice principle type steam meters, density compensated, to ensure accuracy within plus or minus 2 percent of actual flow rate independent of line pressure changes

b. Provide a computer to display totalized flow, flow rate, temperature, pressure, time, and date.

c. The computer shall be capable of providing high and low flow rate and temperature alarm set points, four independent timers to store peak flow rate and total flow, a 4 to 20 mA output and a communication port for energy management interface.

2.1.10.2 Steam Traps

CID A-A-60001 , thermostatic and non-thermostatic steam traps. Provide traps with separate strainers if steam tras do not have integral strainers and locate as indicated.

2.1.10.3 Strainers

FS WW-S-2739 , Style Y (Y pattern) for Class 125 and 250 piping in sizes 1/2 to 8 inches, inclusive, locate as indicated, cast iron prohibited.

2.1.10.4 Hangers, Supports, Spacing Requirements, and Attachments

MSS SP-58 and ASME B31.1 for materials, design, and manufacture. MSS SP-69 for selection and application.

2.2 CONVERTERS

FS WW-H-191, steam to hot water converters, with capacity as indicated for the design conditions. Design converter for support by separate

SECTION 23 22 26.00 20 Page 12 floor-mounted stands, and provide mounting saddles, holddown devices, air vent valve and air and steam traps.

2.3 CONDENSATE RETURN UNITS

2.3.1 Condensate Return Pumping Units

FS F-P-2908 , with floor-mounted receiver, and a duplex pump unit, with capacity as indicated.

2.3.2 Pump Motors

NEMA MG 1, suitable for the electrical characteristics as indicated.

Motors shall be open splash proof or totally enclosed type.

2.3.3 Motor Starters

NEMA ICS 2 , across-the-line magnetic type with NEMA ICS 6 general purpose enclosure.

PART 3 EXECUTION

3.1 INSTALLATION

Work material and equipment into a complete, convenient, and economical system or systems; and provide apparatus, parts, materials, and accessories which are necessary to accomplish this result.

3.1.1 Piping

Fabricate, assemble, weld, solder, braze, and install piping and pipe system in accordance with ASME B31.1 and as further qualified herein.

Piping shall follow the general arrangement shown. Cut piping accurately to measurements established, for the work shown, by the Contractor, and work into place without springing or forcing, except where cold-springing is indicated. Locate piping and equipment within buildings entirely out of the way of lighting fixtures, conduit, and doors, windows, and other openings. Run overhead piping in buildings in the most inconspicuous positions.

Provide adequate clearances from walls, ceilings, and floors to permit the welding of joints; at least 6 inches for pipe sizes 4 inches and smaller, 10 inches for pipe sizes larger than 4 inches, and in corners provide sufficient clearance to permit the welder to work between the pipe and one wall. Make provision for expansion and contraction of pipe lines. Do not bury, conceal, or insulate piping until it has been inspected, tested, and approved. Do not conceal piping in walls, partitions, underground, or under the floor except as indicated. Where pipe passes through building structure, do not conceal pipe joints, but locate where they may be readily inspected and not weaken building structure. Run insulated pipe as shown and as required with sufficient clearance to permit application of insulation. Use flanged joints only where necessary for normal maintenance and where required to match valves and equipment. Gaskets, packing, and thread compounds shall be suitable for the service. Apply joint compound or tape on male thread only. Use long radius ells wherever possible to reduce pressure drops. Pipe bends may be used in lieu of welding fittings where space permits. Pipe bends shall have a uniform radius of at least five times the pipe diameter and shall be free from any appreciable flattening, wrinkling, or thinning of the pipe. Mitering of

SECTION 23 22 26.00 20 Page 13 pipe to form elbows, notching straight runs to form full sized tees, or any similar construction shall not be used.

Make branch connections with welding tees except factory made forged welding branch outlets or nozzles having integral reinforcements conforming to ASME B31.1 may be used, provided the nominal diameter of the branch is at least one pipe size less than the nominal diameter of the run. Run piping as indicated, and avoid interference with other piping, conduit, or equipment. Run vertical piping plumb and straight and parallel to walls, except where specifically shown otherwise. Do not trap lines, except where indicated. Use reducing fittings for changes in pipe sizes. The use of bushings is prohibited. In horizontal lines 2 1/2 inches and larger, use reducing fittings of the eccentric type to maintain the bottom of the lines in the same plane for steam lines and to maintain the top of the lines in the same plane for condensate lines except where a trap or pocket would result.

Provide suitable size sleeves for lines passing through building structure. Install piping connected to equipment to provide flexibility for thermal stresses and for vibration. Support and anchor pipe so that strain from weight and thermal movement of piping is not imposed on the equipment. Thoroughly clean each section of pipe, fittings, and valves of foreign matter before erection. Before placing in position, clean the inside of black steel pipe by rapping along its full length to loosen sand, mill scale, and other foreign matter; pipe 2 inches and larger shall have a wire brush of a diameter larger than that of the inside of the pipe drawn through its entire length several times. Before final connections are made to the apparatus, thoroughly wash out the piping interior with water. Blow out steam piping with high-pressure steam, if available, or compressed air, removing rust, oil, chips, sand, and other material. Plug or cap open ends of mains during shutdown periods. Do not leave lines open at any place where any foreign matter might accidentally enter pipe.

3.1.1.1 Welding

a. Welding of Piping: Welding of joints in piping, butt welds, fillet welds, bends, loops, offsets, and preparation and cleaning of pipe shall be in accordance with ASME B31.1 . Welds shall be visually examined and meet acceptance standards indicated in Chapter VI of

ASME B31.1 .

b. Quality of Welds: Quality of welds, correction of defects, stress relieving, and preheating shall be in accordance with ASME B31.1 .

c. Arc Welding and Gas Welding: In accordance with ASME BPVC SEC IX .

3.1.1.2 Brazing and Soldering

a. Brazing and soldering procedure qualification shall conform to ASME B31.1 . Brazing procedure for joints shall be as outlined in the

CDA A4015.

b. Soldering, soldering preparation, and procedures for joints shall be in accordance with ASME B31.1 and as outlined in the CDA A4015.

c. Copper Tube Extracted Joint: An extracted mechanical tee joint may be made in copper tube. Make joint with an appropriate tool by drilling a pilot hole and drawing out the tube surface to form a collar having a minimum height of three times the thickness of the tube wall. To

SECTION 23 22 26.00 20 Page 14 prevent the branch tube from being inserted beyond the depth of the extracted joint, provide dimpled depth stops. Notch the branch tube for proper penetration into fitting to ensure a free flow joint.

Braze extracted joints using a copper phosphorous classification brazing filler metal. Soldered joints shall not be permitted.

3.1.1.3 Hangers and Supports

Unless otherwise indicated, horizontal and vertical piping attachments shall conform to MSS SP-58 . Continuous inserts and expansion bolts may be used.

3.1.1.4 Grading and Venting of Pipe Lines

Unless otherwise indicated, install horizontal lines of steam and return piping to grade down in the direction of flow with a pitch of not less than one inch in 30 feet, except in loop mains and main headers where the flow may be in either direction. When counterflow of condensate within the steam pipe occurs in a portion of a pipeline, pitch up in the direction of steam flow a minimum of 6 inches per 100 feet and increase pipe diameters by one standard pipe size. Air vents shall be provided at the highest point of any vertical riser.

3.1.1.5 Pipe Sleeves

Provide pipe sleeves where pipes and tubing pass through masonry or concrete walls, floors, roofs, and partitions. Use Schedule 40 galvanized steel pipe sleeves in outside walls below and above grade, in floor, and in roof slabs. Sleeves in partitions shall be zinc-coated sheet steel having a weight of not less than 0.907 psf. Space between pipe, tubing, or insulation and the sleeve shall be not less than 1 inch. Hold sleeves securely in proper position and location before and during construction.

Sleeves shall be of sufficient length to pass through entire thickness of walls, partitions, or slabs. Sleeves in floor slabs shall extend 2 inches above the finished floor. Pack space between the pipe or tubing and the sleeve firmly with oakum and caulk both ends of the sleeve with elastic cement. Furnish sleeves in waterproofed construction with flanges and clamping rings.

3.1.1.6 Floor, Wall, and Ceiling Plates

Secure plates to the pipe with enough clearance for thermal expansion of pipe. Use chromium-plated steel or nickel-plated cast iron plates on pipes passing through floors and partitions of toilet rooms and where indicated; use painted cast iron, malleable iron, or steel for all other plates.

3.1.1.7 Flashing for Buildings

Provide tight waterproof flashing where pipes pass through building roofs and outside walls.

3.1.1.8 Unions and Flanges

Provide unions and flanges where necessary to permit easy disconnection of piping and apparatus, and as indicated. Provide a union for each threaded end valve. Place unions or flanges no farther apart than 100 feet. Use unions on piping smaller than 2 inches in diameter, and use flanges on piping 2 inches and larger in diameter. Provide dielectric unions or

SECTION 23 22 26.00 20 Page 15 flanges between ferrous and non-ferrous piping, equipment, and fittings;

except that bronze valves and fittings may be used without dielectric couplings for ferrous-to-ferrous or non-ferrous to non-ferrous connections. Dielectric fittings shall utilize a non-metallic filler which will prevent current flow. The spacer shall be suitable for the pressure and temperature of the service. The fittings shall otherwise conform to the requirements of paragraph entitled "Fittings."

3.1.1.9 Traps and Connections

Traps shall be of the type and capacity for the service and shall be properly supported and connected. Except for thermostatic traps in pipe coils, radiators, and convectors, install traps with a dirt pocket and strainer between it and the piping or apparatus it drains. When necessary to maintain in continuous service apparatus or piping which is to be drained, provide a three-valve bypass so that the trap may be removed and repaired and condensate may drain through the throttled bypass valve.

Provide a check valve on the discharge side of the trap whenever the trap is installed for lift or operating against a back pressure, or discharges into a common return line. When a thermodynamic trap is used, a check valve is not required or recommended. Provide test connections on the discharge side of the high and medium pressure traps when they are specifically required. The test connection shall include a 1/2 inch globe valve with uncapped nipple.

3.1.1.10 Connections for Future Equipment

Locate capped or plugged outlets for connections to future equipment as indicated.

3.1.2 Valves

3.1.2.1 General

Install valves in conformance with ASME B31.1 , ASME BPVC SEC VIII D1 , and as required herein, at the locations indicated and elsewhere as required for the proper functioning of the system. Use gate valves unless otherwise directed or indicated on the Drawings. Install stop valves in the supply lines equipped or located so as to permit operation from floor level, or provided with safe access in the form of walkways or ladders.

Install valves in positions accessible for operation and repair. Provide gate valves 8 inches and larger with globe-valved bypass in accordance with MSS SP-45 .

3.1.2.2 Globe Valves

Install globe valves so that the pressure shall be below the disk.

Install globe valves with the stems horizontal on steam and exhaust lines.

3.1.2.3 Steam Pressure-Reducing Valves

Provide the steam line entering each pressure-reducing valve with a strainer. Provide each pressure-reducing valve unit with two cutout valves and with a globe or angle bypass valve and bypass piping. Provide each pressure-reducing valve unit with an indicating steam gage to show the reduced pressure, and a safety valve on the low pressure side with sufficient capacity to relieve the high pressure steam.

SECTION 23 22 26.00 20 Page 16

3.1.2.4 Safety Valves

Provide with drip pan elbows.

3.1.3 Pressure Gages

Install a shutoff valve or petcock between each pressure gage and the line, and gages on steam lines shall have a syphon installed ahead of the gage.

3.1.4 Thermometers

Provide thermometers and thermal sensing elements of control valves with a separable socket. Install separable sockets in pipe lines in such a manner to sense the temperature of the flowing fluid and minimize obstruction to flow.

3.1.5 Steam Meters

Provide steam meters with a suitable three-valve bypass to permit dismantling and inspection without interference with the service.

3.1.6 Strainers

Provide strainers with meshes suitable for the services where indicated, and where dirt might interfere with the proper operation of valve parts, orifices, and moving parts of equipment.

3.1.7 Equipment Foundations

Design equipment foundations of sufficient size and weight to provide isolation and to preclude shifting of equipment under operating conditions. Foundations shall meet the requirements of the equipment manufacturer. When required by the Contracting Officer, the equipment manufacturer's approval of the foundation design and construction for the equipment involved shall be obtained.

3.1.8 Equipment Installation

Install equipment as specified and in accordance with the manufacturer's installation instructions. Grout equipment mounted on concrete foundations before piping is installed. Install piping in such a manner as not to place a strain on any of the equipment. Do not bolt flanged joints tight unless they match. Adequately extend expansion bends before installation. Grade, anchor, guide, and support piping without low pockets.

3.1.9 Cleaning of System

As installations of the various system components are completed, clean before final closing. Remove foreign matter from equipment and surrounding areas. Preliminary or final tests shall not be performed until the cleaning is approved.

3.1.10 Cleaning and Painting of Piping and Equipment

Clean and paint piping and equipment in accordance with Section 09 90 00

PAINTS AND COATINGS.

SECTION 23 22 26.00 20 Page 17

3.1.11 Identification of Piping

Labels for pipes 3/4 inch diameter and larger shall bear printed legends to identify contents of pipes and arrows to shown direction of flow.

Labels shall have color coded background to signify levels of hazard in accordance with ASME A13.1 . Legends and type and size of characters shall also conform as ASME A13.1 . Make labels of plastic sheet CID A-A-1689 with pressure sensitivity suitable for the intended applications, or they may be premolded of plastic to fit over pipe. For pipe smaller than 3/4 inch diameter, provide brass identification tags 1 1/2 inches in diameter with legends in depressed black filled characters.

3.2 FIELD TESTS AND INSPECTIONS

Field inspections, field tests, and trial operations specified in this section shall be performed by the Contractor. The Contractor must provide gas, oil, labor, equipment, and incidentals required for testing. The Contractor must give the Contracting Officer 14 days' advance written notice of the dates and times scheduled for tests and trial operations.

Obtain and fill out the NAVFAC boiler/UPV document as specified in Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS prior to startup and testing of boilers and unfired pressure vessels (UPVs) including but not limited to flash tanks and condensate receivers. The document lists commonly missed items for UPVs including the following:

a. Missing vibration pads.

b. Missing flex connectors at discharge outlet.

c. Missing automatic blowdown. Blowdown needs to be installed and routed to nearest drain or safe zone.

3.2.1 Field Inspections

Inspect piping system prior to initial operation, for conformance to drawings, specifications, and ASME B31.1 . Equipment, material, or work rejected because of defects or non-conformance with drawings, specifications, and ASME B31.1 shall be replaced or corrected by the Contractor, as directed by the Contracting Officer.

As specified in Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS, notify the NAVFAC Boiler Inspector and submit checklists when the Contractor's startup and testing of the pressure vessels and boilers is complete. The Inspector's written approval is required for acceptance of this equipment.

3.2.2 Field Tests

Conduct the following tests after completion of the piping installation and prior to initial operation.

3.2.2.1 Piping System

Test piping system hydrostatically using water not exceeding 100 degrees F.

Conduct tests in accordance with the requirements of ASME B31.1 and as follows. Test the piping system after the lines have been cleaned as herein specified and before any insulation covering has been applied.

Test piping system at 1 1/2 times the system pressure or 50 psig whichever is greater. Before performing tests, remove or valve off from the system, gages, traps, and other apparatus which may be damaged by the test

SECTION 23 22 26.00 20 Page 18 pressure. Install a calibrated test pressure gage in the system to observe any loss in pressure. Maintain the required test pressure for a sufficient length of time to enable an inspection to be made of joints and connections. Perform tests after installation and prior to acceptance.

3.2.2.2 Start-Up and Operational Test

Start-up the system and initially operate with components operating.

During the test, periodically clean the various strainers until no further accumulation of foreign material occurs. Exercise care so that minimum loss of steam occur when strainers are cleaned. Adjust safety and automatic control instruments as necessary to place them in proper operation and sequence.

3.2.2.3 Extent of Field Tests

After installation and before acceptance, subject the work of this section to necessary field tests, including those herein specified, and in Section

23 05 93.00 22 TESTING, ADJUSTING, AND BALANCING FOR HVAC.

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