232113 Hydronic Piping seismic.pdf

UPGRADE EMERGENCY POWER IN BUILDING 138

VAMC, MARION, IN PROJECT: 610-16-104

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23 21 13-1

SECTION 23 21 13

HYDRONIC PIPING

PART 1 - GENERAL

1.1 DESCRIPTION

A. Water piping to connect HVAC equipment, including t he following:

1. Chilled water, condenser water, heating hot water a nd drain piping.

2. Extension of domestic water make-up piping for HVAC systems.

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

Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS.

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

C. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FO R NON-STRUCTURAL

COMPONENTS: Seismic restraints for piping.

D. Section 23 05 41, NOISE AND VIBRATION CONTROL FOR H VAC PIPING AND

EQUIPMENT.

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

F. Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC: Temperature and pressure sensors and valve operators.

G. Section 23 22 13, STEAM AND CONDENSATE HEATING PIPI NG.

H. Section 23 84 13, Self-Contained Steam Humidifiers.

1.3 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this s pecification 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.

B. American Society of Mechanical Engineers (ASME):

B1.20.1-2013............Pipe Threads, General Purpo se (Inch)

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

B16.4-2016..............Gray Iron Threaded Fittings : (Classes 125 and

250)

B16.5-2017..............Pipe Flanges and Flanged Fi ttings: NPS 1/2 through NPS 24 Metric/Inch Standard

B16.9-2018..............Factory Made Wrought Buttwe lding Fittings

B16.11-2016.............Forged Fittings, Socket-Wel ding and Threaded

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B16.18-2018.............Cast Copper Alloy Solder Jo int Pressure

Fittings

B16.22-2018.............Wrought Copper and Copper A lloy Solder-Joint

Pressure Fittings

B16.24-2016.............Cast Copper Alloy Pipe Flan ges and Flanged

Fittings: Classes 150, 300, 600, 900, 1500, and

B16.39-2014.............Malleable Iron Threaded Pip e Unions: Classes

150, 250, and 300

B16.42-2016.............Ductile Iron Pipe Flanges a nd Flanged Fittings

B31.9-2014..............Building Services Piping

B40.100-2013............Pressure Gauges and Gauge A ttachments

ASME Boiler and Pressure Vessel Code:

BPVC Section VIII-2015..Rules for Construction of P ressure Vessels

C. American Society for Testing and Materials (ASTM):

A47/A47M-2018...........Standard Specification for Ferritic Malleable

Iron Castings

A53/A53M-2018...........Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and

Seamless

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

Steel Pipe for High-Temperature Service

A126-2004(R2019)........Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings

A183-2014...............Standard Specification for Carbon Steel Track

Bolts and Nuts

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

Temperature Service

A307-2016...............Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60,000 PSI Tensile

Strength

A536-1984(R2019)........Standard Specification for Ductile Iron

Castings

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

B88-2016................Standard Specification for Seamless Copper

Water Tube

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F439-2019...............Standard Specification for Chlorinated Poly

(Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 80

F441/F441M-2015.........Standard Specification for Chlorinated Poly

(Vinyl Chloride) (CPVC) Plastic Pipe, Schedules

40 and 80

D. American Welding Society (AWS):

B2.1/B2.1M-2014.........Standard for Welding Proced ure and Performance

Specification

E. Expansion Joint Manufacturer’s Association, Inc. (E JMA):

EJMA 2017...............Expansion Joint Manufacture r’s Association

Standards, Tenth Edition

F. Manufacturers Standardization Society (MSS) of the Valve and Fitting

Industry, Inc.:

SP-67-2017..............Butterfly Valves

SP-70-2014..............Gray Iron Gate Valves, Flan ged and Threaded

Ends

SP-71-2014..............Gray Iron Swing Check Valve s, Flanged and

Threaded Ends

SP-80-2014..............Bronze Gate, Globe, Angle, and Check Valves

SP-85-2014..............Gray Iron Globe and Angle V alves, Flanged and

Threaded Ends

SP-110-2014.............Ball Valves Threaded, Socke t-Welding, Solder

Joint, Grooved and Flared Ends

SP-125-2018.............Gray Iron and Ductile Iron In-line, Spring-

Loaded, Center-Guided Check Valves

G. Tubular Exchanger Manufacturers Association (TEMA):

TEMA Standards2015......9th Edition

1.4 SUBMITTALS

A. Submittals, including number of required copies, sh all be submitted in accordance with Section 01 33 23, SHOP DRAWINGS, PR ODUCT DATA, AND

SAMPLES.

B. Information and material submitted under this secti on shall be marked

“SUBMITTED UNDER SECTION 23 21 13, HYDRONIC PIPING” , with applicable paragraph identification.

C. Manufacturer's Literature and Data including: Full item description and optional features and accessories. Include dimensio ns, weights, 02-01-20

23 21 13-4 materials, applications, standard compliance, model numbers, size, and capacity.

1. Pipe and equipment supports.

2. Pipe and tubing, with specification, class or type, and schedule.

3. Pipe fittings, including miscellaneous adapters and special fittings.

4. Flanges, gaskets and bolting.

5. Couplings and fittings.

6. Valves of all types.

7. Strainers.

8. Flexible connectors for water service.

9. Pipe alignment guides.

10. Expansion joints.

11. Expansion compensators.

12. All specified hydronic system components.

13. Water flow measuring devices.

14. Gauges.

15. Thermometers and test wells.

16. Seismic bracing details for piping.

D. Submit the welder’s qualifications in the form of a current (less than one-year old) and formal certificate.

E. Coordination Drawings: Refer to paragraph, SUBMITTA LS of Section 23 05

11, COMMON WORK RESULTS FOR HVAC.

F. As-Built Piping Diagrams: Provide drawing as follow s for other piping systems and equipment.

1. One complete set of reproducible drawings.

G. Complete operating and maintenance manuals includin g wiring diagrams, technical data sheets, information for ordering rep lacement parts, and troubleshooting guide:

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

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

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

1.5 QUALITY ASSURANCE

A. Section 23 05 11, COMMON WORK RESULTS FOR HVAC, whi ch includes welding qualifications.

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B. Submit prior to welding of steel piping a certifica te of Welder’s certification. The certificate shall be current and not more than one-year old.

C. All couplings, fittings, valves, and specialties sh all be the products of a single manufacturer.

1. All castings used for coupling housings, fittings, valve bodies, etc., shall be date stamped for quality assurance a nd traceability.

1.6 AS-BUILT DOCUMENTATION

A. Submit manufacturer’s literature and data updated t o include submittal review comments and any equipment substitutions.

B. Submit operation and maintenance data updated to in clude submittal review comments, VA approved substitutions and cons truction revisions shall be in electronic version on CD or DVD and ins erted into a three-ring binder. All aspects of system operation and ma intenance procedures, including applicable piping isometrics, wiring diagrams of all circuits, a written description of system desig n, control logic, and sequence of operation shall be included in the operation and maintenance manual. The operations and maintenance manual shall include troubleshooting techniques and procedures for emerg ency situations.

Notes on all special systems or devices shall be in cluded. A List of recommended spare parts (manufacturer, model number , and quantity) shall be furnished. Information explaining any spec ial knowledge or tools the owner will be required to employ shall be inserted into the

As-Built documentation.

C. The installing contractor shall maintain as-built d rawings of each completed phase for verification; and, shall provid e 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 shall not be deemed a confl ict of interest or breach of the ‘third party testing company’ require ment. Provide record drawings as follows:

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

D. The as-built drawings shall indicate the location a nd type of all lockout/tagout points for all energy sources for al l equipment and pumps to include breaker location and numbers, valv e tag numbers, etc.

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Coordinate lockout/tagout procedures and practices with local VA requirements.

E. Certification documentation shall be provided to CO R 21 working days prior to submitting the request for final inspectio n. The documentation shall include all test results, the names of indivi duals performing work for the testing agency on this project, detail ed procedures followed for all tests, and provide documentation/c ertification that all results of tests were within limits specified. Test results shall contain written sequence of test procedure with wri tten test results annotated at each step along with the expected outc ome or setpoint. The results shall include all readings, including but n ot limited to data on device (make, model and performance characterist ics), normal pressures, switch ranges, trip points, amp readings , and calibration data to include equipment serial numbers or individ ual identifications, etc.

1.7 SPARE PARTS

A. For mechanical pressed sealed fittings provide tool s required for each pipe size used at the facility.

PART 2 - PRODUCTS

2.1 PIPE AND EQUIPMENT SUPPORTS, PIPE SLEEVES, AND WALL AND CEILING PLATES

A. Provide in accordance with Section 23 05 11, COMMON WORK RESULTS FOR

HVAC.

2.2 PIPE AND TUBING

A. Extension of Domestic Water Make-up Piping: ASTM B8 8, Type K or L, hard drawn copper tubing.

B. Cooling Coil Condensate Drain Piping:

1. From air handling units: Copper water tube, ASTM B8 8, Type M, or

Schedule 40 PVC plastic piping.

2. From fan coil or other terminal units: Copper water tube, ASTM B88, Type M for runouts and Type L for mains.

C. Pipe supports, including insulation shields, for ab ove ground piping:

Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

2.3 FITTINGS FOR COPPER TUBING

A. Joints:

1. Solder Joints: Joints shall be made up in accordanc e with recommended practices of the materials applied. App ly 95/5 tin and antimony on all copper piping.

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2. Mechanically formed tee connection in water and dra in piping: Form mechanically extracted collars in a continuous oper ation by drilling pilot hole and drawing out tube surface to form col lar, having a height of not less than three times the thickness o f tube wall.

Adjustable collaring device shall ensure proper tol erance and complete uniformity of the joint. Notch and dimple joining branch tube in a single process to provide free flow where the branch tube penetrates the fitting.

B. Bronze Flanges and Flanged Fittings: ASME B16.24.

C. Fittings: ASME B16.18 cast copper or ASME B16.22 so lder wrought copper.

2.4 FITTINGS FOR PLASTIC PIPING

A. Schedule 40, socket type for solvent welding.

B. Schedule 40 PVC drain piping: Drainage pattern.

C. Chemical feed piping for condenser water treatment: CPVC, Schedule 80, ASTM F439.

2.5 DIELECTRIC FITTINGS

A. Provide where copper tubing and ferrous metal pipe are joined.

B. 50 mm (2 inches) and Smaller: Threaded dielectric u nion, ASME B16.39.

C. 65 mm (2-1/2 inches) and Larger: Flange union with dielectric gasket and bolt sleeves, ASME B16.42. Dielectric gasket ma terial shall be compatible with hydronic medium.

D. Temperature Rating, 99 degrees C (210 degrees F).

E. Contractor’s option: On pipe sizes 50 mm (2 inch) a nd smaller, screwed end brass ball valves or dielectric nipples may be used in lieu of dielectric unions.

2.6 SCREWED JOINTS

A. Pipe Thread: ASME B1.20.1.

B. Lubricant or Sealant: Oil and graphite or other com pound approved for the intended service.

2.7 VALVES

A. Asbestos packing is not acceptable.

B. All valves of the same type shall be products of a single manufacturer.

C. Provide chain operators for valves 150 mm (6 inches ) and larger when the centerline is located 2.4 m (8 feet) or more ab ove the floor or operating platform.

D. Shut-Off Valves:

1. Ball Valves (Pipe sizes 50 mm (2 inch) and smaller) : MSS SP-110, screwed or solder connections, brass or bronze body with chrome-

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23 21 13-8 plated ball with full port and Teflon seat at 2758 kPa (400 psig) working pressure rating. Provide stem extension to allow operation without interfering with pipe insulation.

2. Butterfly Valves (Pipe Sizes 65 mm (2-1/2 inch) and larger): Provide stem extension to allow 50 mm (2 inches) of pipe in sulation without interfering with valve operation. MSS SP-67, flange lug type rated

1200 kPa (175 psig) working pressure at 93 degrees C (200 degrees

F). Valves shall be ANSI Leakage Class VI and rated for bubble tight shut-off to full valve pressure rating. Valve shall be rated for dead end service and bi-directional flow capability to full rated pressure. Butterfly valves are prohibited for direc t buried pipe applications.

a. Body: Cast iron, ASTM A126, Class B. Malleable iron , ASTM

A47/A47M electro-plated, or ductile iron, ASTM A536 , Grade

65-45-12 electro-plated.

b. Trim: Bronze, aluminum bronze, or 300 series stainl ess steel disc, bronze bearings, 316 stainless steel shaft an d manufacturer's recommended resilient seat. Resilien t seat shall be field replaceable, and fully line the body to co mpletely isolate the body from the product. A phosphate coat ed steel shaft or stem is acceptable, if the stem is completely is olated from the product.

c. Actuators: Field interchangeable. Valves for balanc ing service shall have adjustable memory stop to limit open pos ition.

1) Valves 150 mm (6 inches) and smaller: Lever actuato r with minimum of seven locking positions, except where ch ain wheel is required.

2) Valves 200 mm (8 inches) and larger: Enclosed worm gear with handwheel, and where required, chain-wheel operator .

3) Gate Valves:

a) 50 mm (2 inches) and smaller: MSS SP-80, Bronze, 10 35 kPa

(150 psig), wedge disc, rising stem, union bonnet.

b) 65 mm (2-1/2 inches) and larger: Flanged, outside s crew and yoke. MSS SP-70, iron body, bronze mounted, 861 kPa (125 psig) wedge disc.

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E. Globe Valves:

1. Globe Valves:

a. 50 mm (2 inches) and smaller: MSS SP-80, bronze, 10 35 kPa (150 psig) Globe valves shall be union bonnet with metal plug type disc.

b. 65 mm (2-1/2 inches) and larger: 861 kPa (125 psig) , flanged, iron body, bronze trim, MSS SP-85 for globe valves.

F. Check Valves:

1. Swing Check Valves:

a. 50 mm (2 inches) and smaller: MSS SP-80, bronze, 10 35 kPa (150 psig), 45-degree swing disc.

b. 65 mm (2-1/2 inches) and larger: 861 kPa (125 psig) , flanged, iron body, bronze trim, MSS SP-71 for check valves.

2. Non-Slam or Silent Check Valve: Spring loaded doubl e disc swing check or internally guided flat disc lift type chec k for bubble tight shut-off. Provide where check valves are show n in chilled water and hot water piping. Check valves incorporat ing a balancing feature may be used.

a. Body: MSS SP-125 cast iron, ASTM A126, Class B, or steel, ASTM

A216/A216M, Class WCB, or ductile iron, ASTM 536, f langed or wafer type.

b. Seat, disc and spring: 18-8 stainless steel, or bro nze, ASTM B62.

Seats may be elastomer material.

G. Manual Radiator/Convector Valves: Brass, packless, with position indicator.

2.8 STRAINERS

A. Y Type.

1. Screens: Bronze, Monel metal or 18-8 stainless stee l, free area not less than 2-1/2 times pipe area, with perforations as follows: 1.1 mm (0.045 inch) diameter perforations for 100 mm (4 inches) and larger: 3.2 mm (1/8 inch) diameter perforations.

B. Suction Diffusers: Specified in Section 23 21 23, H YDRONIC PUMPS.

2.9 FLEXIBLE CONNECTORS FOR WATER SERVICE

A. Flanged Spool Connector:

1. Single arch or multiple arch type. Tube and cover s hall be constructed of chlorobutyl elastomer with full face d integral flanges to provide a tight seal without gaskets. Co nnectors shall be internally reinforced with high strength synthetic fibers

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23 21 13-10 impregnated with rubber or synthetic compounds as r ecommended by connector manufacturer, and steel reinforcing rings .

2. Working pressures and temperatures shall be as foll ows:

a. Connector sizes 50 mm to 100 mm (2 inches to 4 inch es), 1137 kPa

(165 psig) at 121 degrees C (250 degrees F).

b. Connector sizes 125 mm to 300 mm (5 inches to 12 in ches), 965 kPa

(140 psig) at 121 degrees C (250 degrees F).

3. Provide ductile iron retaining rings and control un its.

2.10 GAUGES, PRESSURE AND COMPOUND

A. ASME B40.100, Accuracy Grade 1A, (pressure, vacuum, or compound for air, oil or water), initial mid-scale accuracy 1 pe rcent of scale

(Qualify grade), metal or phenolic case, 115 mm (4- 1/2 inches) in diameter, 6 mm (1/4 inch) NPT bottom connection, wh ite dial with black graduations and pointer, clear glass or acrylic pla stic window, suitable for board mounting. Provide red "set hand" to indicate normal working pressure.

B. Provide brass lever handle union cock. Provide bras s/bronze pressure snubber for gauges in water service.

C. Range of Gauges: Provide range equal to at least 13 0 percent of normal operating range.

1. For condenser water suction (compound): 101 kPa (30 inches Hg) to

690 kPa (100 psig).

2.11 PRESSURE/TEMPERATURE TEST PROVISIONS

A. Pete's Plug: 6 mm (1/4 inch) MPT by 75 mm (3 inches ) long, brass body and cap, with retained safety cap, nordel self-clos ing valve cores, permanently installed in piping where shown, or in lieu of pressure gauge test connections shown on the drawings.

B. Provide one each of the following test items to the COR:

1. 6 mm (1/4 inch) FPT by 3.2 mm (1/8 inch) diameter s tainless steel pressure gauge adapter probe for extra-long test pl ug.

2. 90 mm (3-1/2 inch) diameter, one percent accuracy, compound gauge, 101 kPa (30 inches Hg) to 690 kPa (100 psig) range.

3. 0 to 104 degrees C (32 to 220 degrees F) pocket the rmometer one-half degree accuracy, 25 mm (1 inch) dial, 125 mm (5 inc h) long stainless-steel stem, plastic case.

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2.12 THERMOMETERS

A. Mercury or organic liquid filled type, red or blue column, clear plastic window, with 150 mm (6 inch) brass stem, st raight, fixed or adjustable angle as required for each in reading.

B. Case: Chrome plated brass or aluminum with enamel f inish.

C. Scale: Not less than 225 mm (9 inches), range as de scribed below, two-degree graduations.

D. Separable Socket (Well): Brass, extension neck type to clear pipe insulation.

E. Scale ranges:

1. Chilled Water and Glycol-Water: 0 to 38 degrees C ( 32 to 100 degrees

F).

2. Hot Water and Glycol-Water: 38 to 93 degrees C (100 to 200 degrees

F).

2.13 FIRESTOPPING MATERIAL

A. Refer to Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

2.14 BACKFLOW PREVENTERS

A. A backflow prevention assembly shall be installed a t any point in the plumbing system where the potable water supply come s in contact with a potential source of contamination. The backflow pre vention assembly shall be approved by the University of Southern Cal ifornia Foundation for Cross Connection Control and Hydraulic Research (USCFCCC).

B. The reduced pressure principle backflow prevention assembly shall be

ASSE listed 1013 with full port OS&Y positive-seal resilient gate valves and an integral relief monitor switch. The m ain body and access cover shall be epoxy coated ductile iron conforming to ASTM A536 grade

4. The seat ring and check valve shall be the therm oplastic type suited for water service. The stem shall be stainless stee l conforming to ASTM

A276. The seat disc shall be the elastomer type sui ted for water service. The checks and the relief valve shall be a ccessible for maintenance without removing the device from the li ne. An epoxy coated wye type strainer with flanged connections shall be installed on the inlet. Reduced pressure backflow preventers shall b e installed in the following applications.

1. Water make up to heating systems, cooling tower, ch illed water system, generators, and similar equipment consuming water.

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PART 3 - EXECUTION

3.1 GENERAL

A. If an installation is unsatisfactory to the COR, th e Contractor shall correct the installation at no additional cost or t ime to the

Government.

B. The drawings show the general arrangement of pipe a nd equipment but do not show all required fittings and offsets that may be necessary to connect pipes to equipment, fan-coils, coils, radia tors, etc., and to coordinate with other trades. Provide all necessary fittings, offsets and pipe runs based on field measurements and at no additional cost or time to the Government. Coordinate with other trade s for space available and relative location of HVAC equipment a nd accessories to be connected on ceiling grid. Pipe location on the dra wings shall be altered by contractor where necessary to avoid inte rferences and clearance difficulties.

C. Store materials to avoid excessive exposure to weat her or foreign materials. Keep inside of piping relatively clean d uring installation and protect open ends when work is not in progress.

D. Support piping securely. Refer to PART 3, Section 2 3 05 11, COMMON WORK

RESULTS FOR HVAC. Install heat exchangers at height sufficient to provide gravity flow of condensate to the flash tan k and condensate pump.

E. Install piping generally parallel to walls and colu mn center lines, unless shown otherwise on the drawings. Space pipin g, including insulation, to provide 25 mm (1 inch) minimum clear ance between adjacent piping or other surface. Unless shown othe rwise, slope drain piping down in the direction of flow not less than 25 mm (1 inch) in 12 m (40 feet). Provide eccentric reducers to keep bot tom of sloped piping flat.

F. Locate and orient valves to permit proper operation and access for maintenance of packing, seat and disc. Generally, l ocate valve stems in overhead piping in horizontal position. Provide a u nion adjacent to one end of all threaded end valves. Control valves usua lly require reducers to connect to pipe sizes shown on the drawing. Inst all butterfly valves with the valve open as recommended by the manufactu rer to prevent binding of the disc in the seat.

G. Offset equipment connections to allow valving off f or maintenance and repair with minimal removal of piping. Provide flex ibility in equipment

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23 21 13-13 connections and branch line take-offs with 3-elbow swing joints where noted on the drawings.

H. Tee water piping runouts or branches into the side of mains or other branches. Avoid bull-head tees, which are two retur n lines entering opposite ends of a tee and exiting out the common s ide.

I. Provide manual or automatic air vent at all piping system high points and drain valves at all low points. Install piping to floor drains from all automatic air vents.

J. Connect piping to equipment as shown on the drawing s. Install components furnished by others such as:

1. Water treatment pot feeders and condenser water tre atment systems.

2. Flow elements (orifice unions), control valve bodie s, flow switches, pressure taps with valve, and wells for sensors.

K. Thermometer Wells: In pipes 65 mm (2-1/2 inches) an d smaller increase the pipe size to provide free area equal to the ups tream pipe area.

L. Firestopping: Fill openings around uninsulated pipi ng penetrating floors or fire walls, with firestop material. For f irestopping insulated piping refer to Section 23 07 11, HVAC AN D BOILER PLANT

INSULATION.

M. Where copper piping is connected to steel piping, p rovide dielectric connections.

N. Install backflow preventers in each water supply to mechanical equipment and systems and to other equipment and wa ter systems that may be sources of contamination. Comply with authoritie s having jurisdiction. Locate backflow preventers in same ro om as connected equipment or system.

1. Install drain for backflow preventers with atmosphe ric-vent drain connection with air-gap fitting, fixed air-gap fitt ing, or equivalent positive pipe separation of at least two pipe diameters in drain piping and pipe to floor drain. Locate air -gap device attached to or under backflow preventer. Simple air breaks are not acceptable for this application.

O. Install pressure gages on outlet of backflow preven ters.

P. Do not install bypass piping around backflow preven ters.

3.2 PIPE JOINTS

A. Welded: Beveling, spacing and other details shall c onform to ASME B31.9 and AWS B2.1/B2.1M. See Welder’s qualification requ irements under

"Quality Assurance" in Section 23 05 11, COMMON WOR K RESULTS FOR HVAC.

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B. Screwed: Threads shall conform to ASME B1.20.1; joi nt compound shall be applied to male threads only and joints made up so no more than three threads show. Coat exposed threads on steel pipe wi th joint compound, or red lead paint for corrosion protection.

C. 125 Pound Cast Iron Flange (Plain Face): Mating fla nge shall have raised face, if any, removed to avoid overstressing the cast iron flange.

D. Solvent Welded Joints: As recommended by the manufa cturer.

3.3 SEISMIC BRACING ABOVEGROUND PIPING

A. Provide in accordance with Section 13 05 41, SEISMI C RESTRAINT

REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS.

3.4 LEAK TESTING ABOVEGROUND PIPING

A. Inspect all joints and connections for leaks and wo rkmanship and make corrections as necessary, to the satisfaction of th e COR. Tests may be either of those below, or a combination, as approve d by the COR.

B. An operating test at design pressure, and for hot s ystems, design maximum temperature.

C. A hydrostatic test at 1.5 times design pressure. Fo r water systems, the design maximum pressure would usually be the static head, or expansion tank maximum pressure, plus pump head. Factory test ed equipment

(convertors, exchangers, coils, etc.) need not be f ield tested. Isolate equipment where necessary to avoid excessive pressu re on mechanical seals and safety devices.

3.5 FLUSHING AND CLEANING PIPING SYSTEMS

A. Water Piping: Clean systems as recommended by the s uppliers of chemicals specified in Section 23 25 00, HVAC WATER TREATMENT.

B. Initial Flushing: Remove loose dirt, mill scale, me tal chips, weld beads, rust, and like deleterious substances withou t damage to any system component. Provide temporary piping or hose to bypass coils, control valves, exchangers and other factory cleane d equipment unless acceptable means of protection are provided and sub sequent inspection of hide-out areas takes place. Isolate or protect c lean system components, including pumps and pressure vessels, a nd remove any component which may be damaged. Open all valves, dr ains, vents and strainers at all system levels. Remove plugs, caps, spool pieces, and components to facilitate early debris discharge fro m system.

Sectionalize system to obtain debris carrying veloc ity of 1.8 m/s (5.9 f/s), if possible. Connect dead-end supply and retu rn headers as

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23 21 13-15 necessary. Flush bottoms of risers. Install tempora ry strainers where necessary to protect down-stream equipment. Supply and remove flushing water and drainage by various type hose, temporary and permanent piping and Contractor's booster pumps. Flush until clean a s approved by the

COR.

C. Cleaning: Using products supplied in Section 23 25 00, HVAC WATER

TREATMENT, circulate systems at normal temperature to remove adherent organic soil, hydrocarbons, flux, pipe mill varnish , pipe joint compounds, iron oxide, and like deleterious substan ces not removed by flushing, without chemical or mechanical damage to any system component. Removal of tightly adherent mill scale i s not required. Keep isolated equipment which is "clean" and where dead- end debris accumulation cannot occur. Sectionalize system if p ossible, to circulate at velocities not less than 1.8 m/s (5.9 f/s). Circulate each section for not less than 4 hours. Blow-down all st rainers, or remove and clean as frequently as necessary. Drain and pre pare for final flushing.

D. Final Flushing: Return systems to conditions requir ed by initial flushing after all cleaning solution has been displ aced by clean make-

up. Flush all dead ends and isolated clean equipmen t. Gently operate all valves to dislodge any debris in valve body by throttling velocity.

Flush for not less than one hour.

3.6 STARTUP AND TESTING

A. Perform tests as recommended by product manufacture r and listed standards and under actual or simulated operating c onditions and prove full compliance with design and specified requireme nts. Tests of the various items of equipment shall be performed simul taneously with the system of which each item is an integral part.

B. When any defects are detected, correct defects and repeat test at no additional cost or time to the Government.

C. Adjust red set hand on pressure gauges to normal wo rking pressure.

3.7 DEMONSTRATION AND TRAINING

A. Provide services of manufacturer’s technical repres entative for 4 hours to instruct each VA personnel responsible in operat ion and maintenance of the system.

B. Submit training plans and instructor qualifications in accordance with the requirements of Section 23 08 00, COMMISSIONING OF HVAC SYSTEMS.

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