Amen. 3- WAPA Construction Standard HVAC Piping.docx

Please provide specification for piping materials to be used.

3 05 15 COMMON PIPING FOR HVAC:

1. GENERAL:

Submittals: Submit in accordance with Section 01 00 00, “General Requirements”.

Quality Assurance:

1) Material Qualifications: Provide materials that are standard products of manufacturers regularly engaged in the manufacture of such products, which are of a similar material, design and workmanship.

Delivery, Storage and Handling: Handle, store and protect materials to prevent damage before and during installation in accordance with the manufacturer's recommendations and as approved by the COR. Replace damaged or defective items.

Accessibility: Install all work so that parts requiring periodic inspection, operation, maintenance and repair are readily accessible. Install concealed valves, expansion joints, controls, dampers and equipment requiring access, in locations freely accessible through access doors.

2. PRODUCTS:

Pipe and Fittings:

1) Type BCS, Black Carbon Steel:

a. Pipe 1/8 through 12-inches shall be Schedule 40 black carbon steel, conforming to ASTM A53.

b. Fittings 2-inches and under shall be 150-pounds per square inch, gage (psig) working steam pressure (wsp) banded black malleable iron screwed, conforming to ASTM A197 and ASME B16.3.

c. Unions 2-inches and under shall be 250-pounds per square inch, wsp female, screwed, black malleable iron with brass-to-iron seat and ground joint, conforming to ASME B16.39.

d. Fittings 2 1/2-inches and over shall be Steel butt weld, conforming to ASTM A234 and ASME B16.9 to match pipe wall thickness.

e. Flanges 2 1/2-inches and over shall be 150-pound forged-steel conforming to ASME B16.5, welding neck to match pipe wall thickness.

2) Type GCS, Galvanized Carbon Steel:

a. Pipe 1/2 through 10-inches, and where indicated shall be Schedule 40 seamless or electric-resistance welded galvanized steel conforming to ASTM A53, Type E, Grade B (electric-resistance welded) or Type S (seamless).

b. Fittings 2-inches and under shall be 150-psig wsp banded galvanized malleable iron screwed, conforming to ASTM A197 and ASME B16.3.

c. Unions 2-inches and under shall be 150-psig wsp female, screwed, galvanized malleable iron with brass-to-iron seat and ground joint.

STANDARD 11 – BUILDINGS

11-67 March 2021

d. The Contractor has the option of using 150-psig wsp banded galvanized malleable iron screwed fittings, conforming to ASTM A197 and ASME B16.3.

3) Type GCS-DWV, Galvanized Steel Drain, Waste and Vent:

a. Pipe (all sizes) shall be Schedule 40 seamless galvanized carbon steel, conforming to ASTM A53, Grade A.

b. Furnace butt weld pipe is acceptable for sizes less than 2-inches.

c. Risers 3-inches and larger shall be Type CISP-DWV.

d. Fittings shall be galvanized, screwed, cast iron, recessed pattern drainage fittings, conforming to ASTM A126.

e. Use long radius fittings wherever space permits. Short-turn tees, branches and ells may be used for vent piping and connections of branch lines to battery fixtures, except wall-hung water closets.

4) Type CPR, Copper:

a. Type CPR-A, Copper Above Ground:

a) Tubing 2-inches and under shall be seamless copper tubing, conforming to ASTM B88, Type L (hard-drawn for all horizontal and all exposed vertical lines, annealed for concealed vertical lines).

b) Fittings 2-inches and under shall be 150-psig wsp wrought-copper solder joint fittings conforming to ASME B16.22. Unions 2-inches and under shall be 150-psig wsp wrought-copper solder joint, conforming to ASME B16.22.

c) Provide brazing rod with Classification BCuP-5, conforming to AWS A5.8.

d) Solder must be 60-40 tin-antimony, alloy Sb-5, conforming to ASTM B32.

b. Type CPR-U, Copper Under Ground:

a) Provide Type K seamless copper tube piping, conforming to ASTM B88.

Socket-joint fittings shall be wrought copper, conforming to ASME B16.22.

Fittings for connection to corporation cocks shall be cast bronze, flared-type, conforming to ASME B16.26. Joints shall be brazed.

c. Type CPR-INS, Copper Under Ground Insulated:

a) Provide insulated Type K seamless copper tube piping conforming to ASTM B88M ASTM B88. Socket-joint fittings shall be wrought copper, conforming to ASME B16.22. Joints shall be brazed.

b) Provide insulation not less than 2-inches thick, suitable for continuous service temperatures of not less than 250-degrees Fahrenheit. Insulation shall be factory-molded, closed-cell polyurethane foam of not less than 2.5-pounds per cubic foot density.

c) Insulation shall be waterproofed with an extruded rigid Type II virgin polyvinylchloride, with minimum wall thickness of 60-mils through 4-inches

STANDARD 11 – BUILDINGS

11-68 March 2021 outside diameter, 85-mils through 6.625-inches and 110-mils through 12.750-inches. Provide fitting covers fabricated from the same materials and thickness as adjacent pipe covering according to the manufacturer's directions.

Piping Specialties:

1) Dielectric Connections: Dissimilar pipe metals shall be electrically insulated from each other by couplings, unions or flanges commercially manufactured for that purpose and rated for the service pressure and temperature.

2) Hose Faucets:

a. Construct hose faucets with 1/2-inch male inlet threads, hexagon shoulder and 3/4-inch hose connection, conforming to ASME A112.18.1/CSA B125.1.

Hose-coupling screw threads shall conform to ASME B1.21M ASME B1.20.7.

b. Vandal proof, atmospheric-type vacuum breaker shall be provided on the discharge of all potable water lines.

Valves:

1) Ball Valves:

a. Ball valves shall conform to MSS SP-72. Valves with ball seals held in place by spring washers are not acceptable . All valves shall have adjustable packing glands. Seats and seals shall be tetrafluoroethylene.

2) Drain, Vent and Gage Cocks:

a. Drain, vent and gage cocks shall be lever handle, ground key type, with washer and screw, constructed of polished ASTM B62 bronze and rated 125-psi wsp. End connections shall be rated for specified service pressure.

b. Pump vent cocks, and where spray control is required, shall be UL umbrella-hood type, constructed of manufacturer's standard polished brass. Cocks shall be 1/2-inch ips male, end threaded and rated at not less than 125-psi at 225-degrees Fahrenheit.

3) Gate Valves (GAV):

a. Gate valves 2-inches and smaller shall conform to MSS SP-72. Valves located in tunnels, equipment rooms, factory-assembled equipment and where indicated shall be union-ring bonnet, screwed-end type. Make packing of non-asbestos type materials. Valves shall be rising stem type.

b. Gate valves 2 1/2-inches and larger, shall be Type I, (solid wedge disc, tapered seats, steam rated); Class 125, 125-psig steam-working pressure at 353-degrees Fahrenheit saturation); and 200-psig, wog (nonshock), conforming to MSS SP-70 and to requirements specified herein. Valves shall be flanged, with bronze trim and outside screw and yoke (OS&Y) construction. Make packing of non-asbestos type materials.

4) Globe and Angle Valves (GLV-ANV):

STANDARD 11 – BUILDINGS

11-69 March 2021

a. Globe and angle valves 2-inches and smaller, shall be 125-pound, 125-psi conforming to MSS SP-85 and to requirements specified herein. Valves located in tunnels, equipment rooms, factory-assembled equipment and where indicated shall be union-ring bonnet, screwed-end type. Disc shall be free to swivel on the stem in all valve sizes. Composition seating-surface disc construction may be substituted for all metal-disc construction. Make packing of non-asbestos type materials. Disk and packing shall be suitable for pipe service installed.

b. Globe and angle valves 2 1/2-inches and larger, shall be cast iron with bronze trim.

Valve bodies shall be cast iron conforming to ASTM A126, Class A, as specified for Class 1 valves under MSS SP-70. Valve ends shall be flanged in conformance with ASME B16.1. Valve construction shall be OS&Y type. Make packing of non-asbestos type materials.

5) Standard Check Valves (SCV):

a. Standard check valves in sizes 2-inches and smaller shall be 125-psi swing check conforming to MSS SP-71, except as otherwise specified. Provide lift checks where indicated. Swing-check pins shall be nonferrous and suitably hard for the service. Discs shall be composition type. Swing-check angle of closure shall be manufacturer's standard unless a specific angle is needed.

b. Check valves in sizes 2 1/2-inches and larger shall be cast iron, bronze trim, swing type. Valve bodies shall be cast iron, conforming to ASTM A126, Class A. Valve ends shall be flanged in conformance with ASME B16.1. Swing-check pin shall be AISI Type or approved equal corrosion-resistant steel. Angle of closure shall be manufacturer's standard unless a specific angle is needed. Valves shall have bolted and gasketed covers.

c. Provide check valves with external spring-loaded or lever-weighted;

positive-closure devices and valve ends shall be mechanical joint, push-on or flanged.

Supporting Elements:

1) Provide all necessary piping systems and equipment supporting elements, including but not limited to: building structure attachments; supplementary steel; hanger rods, stanchions and fixtures; vertical pipe attachments; horizontal pipe attachments;

anchors; guides; and spring-cushion, variable or constant supports. All supporting elements shall be suitable for stresses imposed by systems pressures and temperatures and natural and other external forces normal to this facility without damage to supporting element system or to work being supported.

2) Supporting elements shall conform to requirements of ASME B31.3, MSS SP-58 and MSS SP-69 except as noted.

3. EXECUTION:

Pipe Installation:

1) Fabricate and install piping systems in accordance with ASME B31.3, MSS SP-69 and

AWS WHB-2.9.

2) Connections between steel piping and copper piping shall be electrically isolated from each other with dielectric couplings (or unions) rated for the service.

STANDARD 11 – BUILDINGS

11-70 March 2021

3) Ream all pipe ends before joint connections are made.

4) Screwed joints shall be made up with specified joint compound and not more than three

(3) threads shall show after joint is made up.

5) Apply joint compounds to the male thread only and exercise care to prevent compound from reaching the unthreaded interior of the pipe.

6) Provide screwed unions, welded unions or bolted flanges wherever required to permit convenient removal of equipment, valves and piping accessories from the piping system for maintenance.

7) Securely support piping systems with due allowance for thrust forces, thermal expansion and contraction and shall not be subjected to mechanical, chemical, vibrational or other damage as specified in ASME B31.3.

8) Field welded joints shall conform to the requirements of the AWS WHB-2.9, ASME B31.3 and ASME BPVC SEC IX.

Valves:

1) Provide valves in piping mains and all branches and at equipment where indicated and as specified.

2) Provide valves to permit isolation of branch piping and each equipment item from the balance of the system.

3) Riser and down comer drains above piping shutoff valves in piping 2 1/2-inches and larger shall be provided. Tap and fit shutoff valve body with a 1/2-inch plugged globe valve.

4) Valves unavoidably located in furred or other normally inaccessible places shall be provided with access panels adequately sized for the location and located so that concealed items may be serviced, maintained or replaced.

Supporting Elements Installation:

1) Provide supporting elements in accordance with the referenced codes and standards.

2) Support piping from building structure. No piping shall be supported from roof deck or from other pipe.

3) Piping shall run parallel with the lines of the building. Space and install piping and components so that a threaded pipe fitting may be removed between adjacent pipes and so that there shall be no less than 1/2-inch of clear space between the finished surface and other work and between the finished surface of parallel adjacent piping.

Hangers on different adjacent service lines running parallel with each other shall be arranged to be in line with each other and parallel to the lines of the building.

4) Install piping support elements at intervals specified hereinafter, at locations not more than 3-feet from the ends of each runout, and not over 1-foot from each change in direction of piping.

STANDARD 11 – BUILDINGS

11-71 March 2021

5) Load rating for all pipe-hanger supports shall be based on insulated weight of lines filled with water and forces imposed. Deflection per span shall not exceed slope gradient of pipe. Supports shall be in accordance with the following minimum rod size and maximum allowable hanger spacing for specified pipe. For concentrated loads such as valves, the allowable span must be reduced proportionately:

PIPE SIZE

(INS)

ROD SIZE

(INS)

STEEL PIPE

(FT)

COPPER PIPE

(FT)

1 and smaller 3/8 8 6 1-1/4 to 1 1/12 3/8 10 8 2 3/8 10 8 2-1/2 to 3-1/2 1/2 12 12 4 to 5 5/8 16 14 6 3/4 16 16 8 to 12 7/8 20 20 14 to 18 1 20 20 20 and over 1-1/4 20 20

6) Provide vibration isolation supports where needed.

7) Vertical risers shall be supported independently of connected horizontal piping, whenever practicable, with fixed or spring supports at the base and at intervals to accommodate system range of thermal conditions. Risers shall be guided for lateral stability. For risers subject to expansion, provide only one rigid support at a point approximately one-third down from the top. Place clamps under fittings unless otherwise specified. Support carbon-steel pipe at each floor and at not more than 15-foot intervals for pipe 2-inches and smaller and at not more than 20-foot intervals for pipe 2 1/2-inches and larger.

Underground Piping Installation:

1) Prior to being lowered into a trench, all piping shall be cleaned, visually inspected for apparent defects and tapped with a hammer to audibly detect hidden defects.

2) Excavations shall be dry and clear of extraneous materials when pipe is being laid.

3) Cutting of piping shall be by wheel cutters or other machines designed specifically for that purpose. Electric-arc and oxyacetylene cutting will not be permitted.

4) Laying of pipe shall begin at the low point of a system. When in final acceptance position, it shall be true to the grades and alignment indicated, with unbroken continuity of invert. Blocking and wedging will not be permitted.

5) Make changes in direction with long sweep fittings.

6) Necessary socket clamping, piers, bases, anchors and thrust blocking shall be provided. Protect rods, clamps and bolting with a coating of bitumen.

STANDARD 11 – BUILDINGS

11-72 March 2021

7) Underground piping below supported or suspended slabs shall be supported from the slab with a minimum of two (2) supports per length of pipe. Protect supports with a coating of bitumen.

8) Vertical downspouts; soil, waste and vent stacks; water risers; and similar work shall be properly supported on approved piers at the base and provided with approved structural supports attached to building construction.