232113.13 FL - UNDERGROUND HYDRONIC PIPING.pdf

TVHS Alvin C. York VA Medical Center

Integrated Health Center

VA Project #36C249-20-AP-3529 – 626-309

Murfreesboro, TN

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SECTION 23 21 13.13

UNDERGROUND HYDRONIC PIPING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Copper tube and fittings.

2. Steel pipe and fittings.

3. Transition fittings.

4. Preengineered cased piping system.

1.2 DEFINITIONS

A. Invert: Vertical distance from Project datum reference point to bottom interior pipe surface.

1.3 ACTION SUBMITTALS

A. Product Data: For the following:

1. Preengineered cased piping system components.

2. Cased piping.

B. Shop Drawings: For underground hydronic piping. Signed and sealed by a professional engineer.

1. Include calculations showing requirements for expansion compensation for underground piping.

2. Show expansion compensators, offsets, and loops with appropriate materials to allow piping movement at required locations. Show anchors and guides that restrain piping movement with calculated loads, and show concrete thrust block dimensions.

3. Show pipe sizes, locations, inverts, and pitch. Show piping in trench, piping in conduit, and cased pipe with details showing clearances between piping.

4. Show insulation thickness.

C. Delegated Design Submittal: For underground hydronic piping systems indicated to comply with performance requirements and design criteria, including analysis data and design drawings signed and sealed by the professional engineer responsible for their preparation.

1. Include design calculations and details for selecting thermal expansion and thrust restraints.

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1.4 INFORMATIONAL SUBMITTALS

A. Coordination Drawings: Show pipe sizes, locations, and elevations.

Show other piping in same trench and clearances from hydronic distribution piping. Indicate interface and spatial relationship between manholes, piping, and proximate structures.

B. Profile Drawings: Show system piping in elevation. Draw profiles at horizontal scale of not less than 1 inch equals 50 feet and at vertical scale of not less than 1 inch equals 5 feet.

1. Show locations and inverts of utility system manholes and piping.

Show manholes and piping. Show types, sizes, materials, and inverts of other utilities crossing hydronic piping.

2. Show depth of cover from top of hydronic system pipes to finished grade.

C. Qualification Data: For Installer.

D. Welding certificates.

E. Material Test Reports: For cased piping, by a qualified testing agency.

F. Source quality-control reports.

G. Field quality-control reports.

1.5 QUALITY ASSURANCE

A. Welding Qualifications: Qualify procedures and personnel in accordance with ASME Boiler and Pressure Vessel Code: Section IX.

1. Comply with provisions in ASME B31.9, "Building Services Piping."

2. Certify that each welder has passed AWS qualification tests for welding processes involved and that certification is current.

B. ASME Compliance: Comply with ASME B31.9, "Building Services Piping," for materials, products, and installation.

1.6 FIELD CONDITIONS

A. Interruption of Existing Utilities: Do not interrupt utilities serving occupied facilities unless permitted under the following conditions and then only after arranging to provide temporary utility services in accordance with requirements indicated:

1. Notify Owner no fewer than two days in advance of proposed interruption of utility.

2. Do not proceed with interruption of utility without Owner's written permission.

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1.7 COORDINATION

A. Coordinate pipe-fitting pressure classes with products specified in related Sections.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Provide components and installation capable of producing hydronic piping systems with the following minimum working-pressure ratings:

1. Chilled-Water Piping: 150 psig at 200 deg F.

B. Delegated Design: Engage a qualified professional engineer, as defined in Section 014000 "Quality Requirements," to design underground hydronic piping systems, including restraints and anchors.

2.2 COPPER TUBE AND FITTINGS

A. Drawn-Temper Copper Tubing: ASTM B88, Type K.

B. Wrought-Copper Fittings: ASME B16.22.

C. Wrought-Copper Unions: ASME B16.22.

D. Solder Filler Metals: ASTM B32, lead-free silver solder alloys.

Include water-flushable flux in accordance with ASTM B813.

E. Brazing Filler Metals: AWS A5.8M/A5.8, BCuP Series, copper-phosphorus alloys for joining copper with copper; or BAg-1, silver alloy for joining copper with bronze or steel.

2.3 STEEL PIPE AND FITTINGS

A. Steel Pipe: ASTM A53/A53M, black steel with plain ends; welded and seamless, Grade B, black with plain ends; wall thickness as indicated in "Piping Application" Article.

B. Cast-Iron Threaded Fittings: ASME B16.4; standard pattern, with threads in accordance with AME B1.20.1; Class 125 and Class 250 as indicated in "Piping Application" Article.

C. Malleable-Iron Threaded Fittings: ASME B16.3; Class 150 and Class 300 as indicated in "Piping Application" Article.

D. Malleable-Iron Unions: ASME B16.39; Classes 150, 250, and 300 as indicated in "Piping Application" Article.

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E. Cast-Iron Pipe Flanges and Flanged Fittings: ASME B16.1, Class 125 and

Class 250; raised ground face, and bolt holes spot faced.

F. Wrought-Steel Fittings: ASTM A234/A234M, wall thickness to match adjoining pipe.

G. Wrought Cast- and Forged-Steel Flanges and Flanged Fittings:

ASME B16.5, including bolts, nuts, and gaskets of the following material group, end connections, and facings:

1. Material Group: 1.1.

2. End Connections: Butt welding.

3. Facings: Raised face.

H. Steel Welding Fittings: ASME B16.9 seamless or welded.

1. Welding Filler Metals: Comply with AWS D10.12M/D10.12 for welding materials appropriate for wall thickness and chemical analysis of steel pipe being welded.

I. Grooved-End-Pipe Couplings for Galvanized-Steel Piping: AWWA C606 for steel-pipe dimensions. Include ferrous housing sections, EPDM-rubber gaskets suitable for hot and cold water, and bolts and nuts.

J. Nipples: ASTM A733, made of same materials and wall thicknesses as pipe in which they are installed.

K. Pipe-Flange Gasket Materials: Suitable for chemical and thermal conditions of piping system contents.

1. ASME B16.21, nonmetallic, flat, asbestos free, 1/8-inch-maximum thickness unless thickness or specific material is indicated.

a. Full-Face Type: For flat face, Class 125, cast-iron and -bronze flanges.

b. Narrow-Face Type: For raised face, Class 250, cast-iron and steel flanges.

L. Flange Bolts and Nuts: ASME B18.2.1, carbon steel, unless otherwise indicated.

2.4 TRANSITION FITTINGS

A. Source Limitations: Obtain transition fittings from single source from single manufacturer.

B. Plastic-to-Metal Transition Fittings: [CPVC] [and] [PVC] one-piece fitting with one threaded brass or copper insert and one Schedule 80 solvent-cemented-joint end.

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2.5 PREENGINEERED CASED PIPING SYSTEM

A. Source Limitations: Obtain piping system from single source from single manufacturer.

B. Description: Factory-fabricated piping with carrier pipe, insulation, and casing.

C. Carrier Pipe: Materials as indicated in "Piping Application" Article.

See articles in this Section for required carrier pipe material characteristics.

D. Carrier Pipe Insulation:

1. Polyurethane Foam Pipe Insulation: Rigid, cellular, and high-pressure injected between carrier pipe and jacket.

a. Comply with ASTM C591; thermal conductivity (k-value) may not exceed 0.165 Btu x in./h x sq. ft. x deg F at 75 deg F after

180 days of aging.

E. Casing: HDPE.

F. Casing accessories include the following:

1. Joint Kit: Half-shell, pourable or split insulation, casing sleeve, and shrink-wrap sleeve.

2. Expansion Blanket: Elastomeric foam, formed to fit over piping.

3. End Seals: Shrink wrap the casing material to seal watertight around casing and carrier pipe.

G. Manholes: Black steel with lifting eyes.

1. Finish: Spray-applied urethane, minimum 30 mils thick.

2. Access: 30-inch-diameter waterproof cover with gasket, ladder, and two 6-inch vents, one high and one low, extending above grade with rain caps.

3. Conduit Stub-Outs and Seals: Welded steel with drain and vent openings.

4. Sump: 12 inches in diameter; 12 inches deep.

5. Floatation Anchor: Oversized bottom keyed into concrete base.

H. Cover: With polyurethane foam insulation with an HDPE jacket;

thickness indicated in "Piping Application" Article.

I. Source Quality Control: Factory test carrier pipe to 150 percent of operating pressure of system. Furnish test certificates.

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PART 3 - EXECUTION

3.1 EARTHWORK

A. See Section 312000 "Earth Moving" for excavating, trenching, and backfilling.

3.2 PIPING APPLICATION

A. Chilled-Water Piping:

1. NPS 2 and smaller to be the following:

a. Type K copper tubing, wrought-copper fittings, and [soldered]

[brazed] joints for direct-buried piping installations.

b. Schedule 40 steel pipe; Class 125, cast-iron fittings; cast-iron flanges and flange fittings; and threaded joints.

2. NPS 2-1/2 and larger to be the following:

a. Schedule 40 steel pipe; Class 125, cast-iron fittings; cast-iron flanges and flange fittings; and threaded joints.

3. Cased Piping: Polyurethane carrier-pipe insulation.

a. Piping Insulation Thickness: 2 inches.

3.3 INSTALLATION OF PIPING

A. Drawing plans, schematics, and diagrams indicate general location and arrangement of piping systems. Indicate piping locations and arrangements if such were used to size pipe and calculate friction loss, expansion, pump sizing, and other design considerations. Install piping as indicated unless deviations to layout are approved on coordination drawings.

B. Remove standing water in the bottom of trench.

C. Bed the pipe on a minimum 6-inch layer of pipe system manufacturer's recommended granular fill material with a minimum 6-inch clearance between pipes.

D. Do not backfill piping trench until field quality-control testing has been completed and results approved.

E. Install piping at uniform grade of 0.2 percent. Install required fittings to accommodate capped drains at low points and elsewhere as required for system drainage. Install capped manual air vents at high points.

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1. Maintain continuous bedding under piping. Do not leave gaps in pipe bedding, allowing pipe to sag between contact points with the bedding.

F. Install components with pressure rating equal to or greater than system operating pressure.

G. Install piping in straight lines. Do not bend pipe.

H. Install fittings for changes in direction and branch connections.

I. See Section 230500 "Common Work Results for HVAC" for sleeves and mechanical sleeve seals through exterior building walls.

J. Secure anchors with concrete thrust blocks. Concrete is specified in

Section 033000 "Cast-in-Place Concrete."

K. Connect to hydronic piping where it passes through the building wall.

Hydronic piping inside the building is specified in Section 232113

"Hydronic Piping."

L. See Section 230517 "Sleeves and Sleeve Seals for HVAC Piping" for sleeves and mechanical sleeve seals through exterior building walls.

M. Secure anchors and fittings where piping changes direction, and where elsewhere required by manufacturer's written installation instructions, with concrete thrust blocks. Concrete is specified in

Section 033000 "Cast-in-Place Concrete."

N. See Section 134713 "Cathodic Protection" for cathodic devices and connections to piping and conduit systems.

O. Apply bitumastic coating to carbon-steel anchors and guides. Pour concrete thrust blocks and anchors. See Section 033000 "Cast-in-Place

Concrete" for concrete and reinforcement.

P. After field quality-control testing is complete, backfill with 6 inches of clean, granular material in accordance with piping system manufacturer's written instructions. If mechanical compaction is required, manually backfill to 12 inches before using mechanical-compaction equipment.

3.4 JOINT CONSTRUCTION

A. See Section 330500 "Common Work Results for Utilities" for basic piping joint construction.

B. Join pipe and fittings in accordance with the following requirements and Section 232113 "Hydronic Piping":

1. Ream ends of pipes and tubes and remove burrs. Bevel plain ends of steel pipe.

2. Remove scale, slag, dirt, and debris from inside and outside of pipe and fittings before assembly.

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C. Soldered Joints: Apply ASTM B813, water-flushable flux, unless otherwise indicated, to tube end. Construct joints in accordance with

ASTM B828 or CDA's "Copper Tube Handbook," using lead-free solder alloy complying with ASTM B32.

D. Brazed Joints: Construct joints in accordance with AWS's "Brazing

Handbook," Ch. 35, "Pipe and Tubing," using copper-phosphorus brazing filler metal complying with AWS A5.8M/A5.8.

E. Threaded Joints: Thread pipe with tapered pipe threads in accordance with ASME B1.20.1 or ISO 7-1. Cut threads full and clean using sharp dies. Ream threaded pipe ends to remove burrs and restore full ID.

Join pipe fittings and valves as follows:

1. Apply appropriate tape or thread compound to external pipe threads unless dry seal threading is specified.

2. Damaged Threads: Do not use pipe or pipe fittings with threads that are corroded or damaged. Do not use pipe sections that have cracked or open welds.

F. Welded Joints: Construct joints in accordance with AWS D10.12M/D10.12, using qualified processes and welding operators, in accordance with

"Quality Assurance" Article.

G. Flanged Joints: Select appropriate gasket material, size, type, and thickness for service application. Install gasket concentrically positioned. Use suitable lubricants on bolt threads.

H. Fiberglass Bonded Joints: Prepare pipe ends and fittings, apply adhesive, and join in accordance with pipe manufacturer's written instructions.

I. Cased Piping Joints: Assemble sections and finish joints with pourable or split insulation and exterior jacket sleeve, and apply shrink-wrap seals.

3.5 IDENTIFICATION

A. Install continuous plastic underground warning tapes during backfilling of trenches for underground hydronic piping. Locate tapes

6 to 8 inches below finished grade, directly over piping. See

Section 312000 "Earth Moving" for warning-tape materials and devices and their installation.

3.6 FIELD QUALITY CONTROL

A. Testing Agency: [Owner will engage] [Engage] a qualified testing agency to perform tests and inspections.

B. Manufacturer's Field Service: Engage a factory-authorized service representative to test and inspect components, assemblies, and equipment installations, including connections.

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C. Tests and Inspections:

1. Prepare hydronic piping for tests by providing joint weld inspections according to ASME B31.1 as follows:

a. Non-destructive examination in accordance with Table 136.4, for all joint weld types, pressures, and temperatures, provide RT – Radiographic examination.

b. Radiography examination shall be performed in accordance with

Article 2, Section V of the ASME 31.1 code. Acceptance standards: cracks or zones of incomplete fusion discontinuities will be unacceptable per the code tolerances.

2. Prepare hydronic piping for testing in accordance with ASME B31.9 and as follows:

a. Leave joints, including welds, uninsulated and exposed for examination during test.

b. Isolate equipment and instrumentation. Do not subject equipment and instrumentation to test pressure.

c. Install relief valve set to relieve at pressure no more than one-third higher than test pressure.

d. Fill system with water. Where there is risk of freezing, perform testing with air or liquid that will not freeze or cause damage to piping system materials.

e. For hydrostatic testing, install vents at high points to release trapped air while filling system. Remove test liquid at accessible low points.

3. Test hydronic piping as follows:

a. Subject hydronic piping to hydrostatic test pressure that is not less than 1.5 times system design pressure.

b. After hydrostatic test pressure has been applied for 10 minutes, examine joints for leakage. Remake leaking joints using new materials and repeat hydrostatic test until no leaks exist.

c. Do not pressurize carrier pipe with air.

d. Maintain test pressure for two hours with no loss of pressure.

D. Piping will be considered defective if it does not pass tests and inspections.

E. Prepare test and inspection reports.

F. When successful testing is complete, flush carrier piping to remove dirt or debris remaining after construction. Drain piping after flushing is complete.

G. Fill underground piping system with permanent system liquid prior to system testing and balancing.

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