VIRGINIA TECH ADVANCED DESIGN AND CONSTRUCTION FACILITY (0336) 100% CONSTRUCTION DOCUMENTS DATE APRIL 6, 2018

Transcription

1

2

3 VIRGINIA TECH ADVANCED DESIGN AND CONSTRUCTION FACILITY (0336) 100% CONSTRUCTION DOCUMENTS DATE APRIL 6, 2018 PROCUREMENT AND CONTRACT DOCUMENTS DGS Notice of Invitation for Bids Seals Page List of Drawing Sheets HECO-6a Statement of Special Inspections HECO-6b Schedule of Special Inspections HECO-6d Interim Report of Special Inspections HECO-6e Statement of Contractors Responsibility HECO-6f Fabricators Certificate of Compliance CO-7 Commonwealth of Virginia General Conditions of the Construction Contract Virginia Tech Supplemental General Conditions to the General Conditions of the Construction Contract Virginia Tech Special Terms and Conditions CO-7a Instructions to Bidders DGS Pre-Bid Question Form DGS Bid Form CO-10.2 Standard Bid Bond CO-9 Contract Between University and Contractor CO-9a Workers Compensation Certificate of Coverage CO-10 Standard Performance Bond CO-10.1 Standard Labor and Material Payment Bond CO-11 Contract Change Order CO-GC-1 Change Order Estimate (General Contractors) CO-SC-1 Change Order Estimate (Subcontractors) CO-SS-1 Change Order Estimate (Sub-Subcontractors) CO-12 Schedule of Values and Certificate for Payment CO-13 Affidavit of Payment of Claims HECO 13.1 Certificate of Completion by A/E or Project Manager HECO 13.1a Certificate of Completion by A/E HECO 13.1b Final Report of Structural and Special Inspections HECO-13.2 Certificate of Completion by Contractor HECO-13.2a Certificate of Partial or Substantial Completion by Contractor Qualifications of Inspectors and Testing Technicians TECHNICAL SPECIFICATIONS Division 01 General Conditions General Provisions Summary of Work Work Restrictions Project Utility Sources Payment Procedures Project Management and Coordination Table of Contents Advanced Design and Construction Facility (0336)

4 Submittal Procedures Quality Assurance and Control Temporary Facilities and Controls Temporary Utilities Construction Facilities Vehicular Access and Parking Temporary Barriers and Enclosures Contract Closeout Project Record Documents and Contractors As-Builts Division 02 Site Work Site Demolition Division 03 Concrete Cast-in-Place Concrete Division 07 Thermal and Moisture Protection Snow Guards Division 08 Doors and Windows Hollow Metal Doors and Frames Door Hardware Division 09 Finishes Non-Structural Metal Framing Gypsum Board Resilient Base and Accessories Interior Painting Division 10 Specialties Toilet, Bath, and Laundry Accessories Fire Extinguishers Division 13 Special Construction Metal Building Systems Division 21 Fire Suppression Wet Pipe Sprinkler Systems Division 22 Plumbing Sleeves and Sleeve Seals Meters and Gages for Plumbing Piping General Duty Valves for Plumbing Piping Hangers and Supports Identification for Plumbing Piping and Equipment Plumbing Piping Insulation Domestic Water Piping Domestic Water Piping Specialties Sanitary Waste and Vent Piping Fuel Gas Piping Electric, Domestic-Water Heaters Table of Contents Advanced Design and Construction Facility (0336)

5 Commercial Plumbing Fixtures Division 23 Heating, Ventilations, and Air Conditioning HVAC Summary HVAC General Work Requirements HVAC Submittal List HVAC Systems Owner Training HVAC Electrical Provision HVAC Equipment Motors Variable Speed Controllers Hangers and Supports HVAC Systems Identification Testing Adjusting and Balancing Duct Insulation Metal Ducts Metal Duct Accessories HVAC System Fans Diffusers Grilles and Registers Particulate Air Filtration Standard Efficiency Packaged Rooftop Units Air Coils Unit Heaters Infrared Heaters Division 25 Integrated Automation Digital Controls and Instrumentation Division 26 Electrical Basic Electrical Requirements Basic Electrical Materials and Methods Conductors and Cables Grounding and Bonding Hangers and Supports Raceways and Boxes Identification for Electrical Systems Lighting Control Devices Dry-type Transformers Panelboards Wiring Devices Fuses Enclosed Switches and Circuit Breakers Lightning Protection for Structures Lighting Fire Alarm Division 31 Earthwork Site Preparation: Clearing and Grubbing Earth Moving Dewatering Erosion and Sediment Control Table of Contents Advanced Design and Construction Facility (0336)

6 Division 32 Exterior Improvements Asphalt Paving Concrete Paving Division 33 Utilities Utility Line Testing Earthwork for Utilities Utility Location and Identification Sanitary Sewer Piping Division 99 Crane Documents (For Reference Only) 5 Ton Crane Specifications Crane Operators Manual END OF SECTION Table of Contents Advanced Design and Construction Facility (0336)

7 SECTION INTERIOR PAINTING PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section includes surface preparation and the application of paint systems on interior substrates. 1.3 ACTION SUBMITTALS A. Product Data: For each type of product. Include preparation requirements and application instructions. 1.4 MAINTENANCE MATERIAL SUBMITTALS A. Furnish extra materials, from the same product run, that match products installed and that are packaged with protective covering for storage and identified with labels describing contents. 1. Paint: 5% percent, but not less than 1 gal. of each material and color applied. 1.5 QUALITY ASSURANCE A. Mockups: Apply mockups of each paint system indicated and each color and finish selected to verify preliminary selections made under Sample submittals and to demonstrate aesthetic effects and set quality standards for materials and execution. 1. Owner will select one surface to represent surfaces and conditions for application of each paint system specified in Part 3. a. Vertical and Horizontal Surfaces: Provide samples of at least 100 sq. ft.. b. Other Items: Architect will designate items or areas required. 2. Final approval of color selections will be based on mockups. a. If preliminary color selections are not approved, apply additional mockups of additional colors selected by Architect at no added cost to Owner. Interior Painting Storage Facility Building

8 3. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Architect specifically approves such deviations in writing. 4. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion. 1.6 DELIVERY, STORAGE, AND HANDLING A. Store materials not in use in tightly covered containers in well-ventilated areas with ambient temperatures continuously maintained at not less than 45 deg F. 1. Maintain containers in clean condition, free of foreign materials and residue. 2. Remove rags and waste from storage areas daily. 1.7 FIELD CONDITIONS A. Apply paints only when temperature of surfaces to be painted and ambient air temperatures are between 50 and 95 deg F B. Do not apply paints when relative humidity exceeds 85 percent; at temperatures less than 5 deg F above the dew point; or to damp or wet surfaces. PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Manufacturers: Subject to compliance with requirements, provide products by one of the following 1. Benjamin Moore & Co. 2. ICI Paints. 3. PPG Architectural Finishes, Inc. 4. Sherwin-Williams Company (The). 2.2 PAINT, GENERAL A. MPI Standards: Provide products that comply with MPI standards indicated and that are listed in its "MPI Approved Products List." B. Material Compatibility: 1. Provide materials for use within each paint system that are compatible with one another and substrates indicated, under conditions of service and application as demonstrated by manufacturer, based on testing and field experience. 2. For each coat in a paint system, provide products recommended in writing by manufacturers of topcoat for use in paint system and on substrate indicated. Interior Painting Storage Facility Building

9 C. VOC Content: Products shall comply with VOC limits of authorities having jurisdiction and, for interior paints and coatings applied at Project site, the following VOC limits, exclusive of colorants added to a tint base, when calculated according to 40 CFR 59, Subpart D (EPA Method 24). 1. Flat Paints and Coatings: 50 g/l. 2. Nonflat Paints and Coatings: 150 g/l. 3. Dry-Fog Coatings: 400 g/l. 4. Primers, Sealers, and Undercoaters: 200 g/l. 5. Anticorrosive and Antirust Paints Applied to Ferrous Metals: 250 g/l. 6. Zinc-Rich Industrial Maintenance Primers: 340 g/l. 7. Pretreatment Wash Primers: 420 g/l. 8. Floor Coatings: 100 g/l. 9. Shellacs, Clear: 730 g/l. 10. Shellacs, Pigmented: 550 g/l. D. Colors: As selected by Architect from manufacturer's full range 2.3 SOURCE QUALITY CONTROL A. Testing of Paint Materials: Owner reserves the right to invoke the following procedure: 1. Owner may direct Contractor to stop applying coatings if test results show materials being used do not comply with product requirements. Contractor shall remove noncomplying paint materials from Project site, pay for testing, and repaint surfaces painted with rejected materials. Contractor will be required to remove rejected materials from previously painted surfaces if, on repainting with complying materials, the two paints are incompatible. PART 3 - EXECUTION 3.1 EXAMINATION A. Examine substrates and conditions, with Applicator present, for compliance with requirements for maximum moisture content and other conditions affecting performance of the Work. B. Maximum Moisture Content of Substrates: When measured with an electronic moisture meter as follows: 1. Concrete: 12 percent. 2. Masonry (Clay and CMU): 12 percent. 3. Wood: 15 percent. 4. Gypsum Board: 12 percent. 5. Plaster: 12 percent. C. Gypsum Board Substrates: Verify that finishing compound is sanded smooth. Interior Painting Storage Facility Building

10 D. Verify suitability of substrates, including surface conditions and compatibility with existing finishes and primers. E. Proceed with coating application only after unsatisfactory conditions have been corrected. 1. Application of coating indicates acceptance of surfaces and conditions. 3.2 PREPARATION A. Comply with manufacturer's written instructions and recommendations in "MPI Manual" applicable to substrates indicated. B. Remove hardware, covers, plates, and similar items already in place that are removable and are not to be painted. If removal is impractical or impossible because of size or weight of item, provide surface-applied protection before surface preparation and painting. 1. After completing painting operations, use workers skilled in the trades involved to reinstall items that were removed. Remove surface-applied protection if any. C. Clean substrates of substances that could impair bond of paints, including dust, dirt, oil, grease, and incompatible paints and encapsulants. 1. Remove incompatible primers and reprime substrate with compatible primers or apply tie coat as required to produce paint systems indicated. D. Steel Substrates: Remove rust, loose mill scale, and shop primer, if any. Clean using methods recommended in writing by paint manufacturer. 1. SSPC-SP 2, "Hand Tool Cleaning." 2. SSPC-SP 3, "Power Tool Cleaning." 3. SSPC-SP 7/NACE No. 4, "Brush-off Blast Cleaning." 4. SSPC-SP 11, "Power Tool Cleaning to Bare Metal." E. Shop-Primed Steel Substrates: Clean field welds, bolted connections, and abraded areas of shop paint, and paint exposed areas with the same material as used for shop priming to comply with SSPC-PA 1 for touching up shop-primed surfaces. F. Galvanized-Metal Substrates: Remove grease and oil residue from galvanized sheet metal fabricated from coil stock by mechanical methods to produce clean, lightly etched surfaces that promote adhesion of subsequently applied paints. G. Aluminum Substrates: Remove loose surface oxidation. 3.3 APPLICATION A. Apply paints according to manufacturer's written instructions and to recommendations in "MPI Manual." Interior Painting Storage Facility Building

11 1. Use applicators and techniques suited for paint and substrate indicated. 2. Paint surfaces behind movable equipment and furniture same as similar exposed surfaces. Before final installation, paint surfaces behind permanently fixed equipment or furniture with prime coat only. 3. Paint front and backsides of access panels, removable or hinged covers, and similar hinged items to match exposed surfaces. 4. Do not paint over labels of independent testing agencies or equipment name, identification, performance rating, or nomenclature plates. 5. Primers specified in painting schedules may be omitted on items that are factory primed or factory finished if acceptable to topcoat manufacturers. B. Tint each undercoat a lighter shade to facilitate identification of each coat if multiple coats of same material are to be applied. Tint undercoats to match color of topcoat, but provide sufficient difference in shade of undercoats to distinguish each separate coat. C. If undercoats or other conditions show through topcoat, apply additional coats until cured film has a uniform paint finish, color, and appearance. D. Apply paints to produce surface films without cloudiness, spotting, holidays, laps, brush marks, roller tracking, runs, sags, ropiness, or other surface imperfections. Cut in sharp lines and color breaks. 3.4 FIELD QUALITY CONTROL A. Dry Film Thickness Testing: Owner may engage the services of a qualified testing and inspecting agency to inspect and test paint for dry film thickness. 1. Contractor shall touch up and restore painted surfaces damaged by testing. 2. If test results show that dry film thickness of applied paint does not comply with paint manufacturer's written recommendations, Contractor shall pay for testing and apply additional coats as needed to provide dry film thickness that complies with paint manufacturer's written recommendations. 3.5 CLEANING AND PROTECTION A. At end of each workday, remove rubbish, empty cans, rags, and other discarded materials from Project site. B. After completing paint application, clean spattered surfaces. Remove spattered paints by washing, scraping, or other methods. Do not scratch or damage adjacent finished surfaces. C. Protect work of other trades against damage from paint application. Correct damage to work of other trades by cleaning, repairing, replacing, and refinishing, as approved by Architect, and leave in an undamaged condition. D. At completion of construction activities of other trades, touch up and restore damaged or defaced painted surfaces. Interior Painting Storage Facility Building

12 3.6 INTERIOR PAINTING SCHEDULE A. Steel Substrates- Included, but not limited to: Steel Structure, frames and doors. 1. Latex over Alkyd Primer System: a. Prime Coat: Primer, alkyd, anti-corrosive, for metal or primer, alkyd, quick dry, for metal. b. Prime Coat: Shop primer specified in Section where substrate is specified. c. Intermediate Coat: Latex, interior, matching topcoat. d. Topcoat: Latex, interior, semi gloss B. Galvanized-Metal Substrates: 1. High-Performance Architectural Latex System: a. Prime Coat: Primer, galvanized, water based b. Intermediate Coat: Latex, interior, high performance architectural, matching topcoat. c. Topcoat: Latex, interior, high performance architectural, Semi Gloss C. Gypsum Board Substrates: 1. High-Performance Architectural Latex System: a. Prime Coat: Primer sealer, latex, interior b. Intermediate Coat: Latex, interior, high performance architectural, matching topcoat. c. Topcoat: Latex, interior, high performance architectural, Satin END OF SECTION Interior Painting Storage Facility Building

13 SECTION GENERAL DUTY VALVES FOR PLUMBING PIPING PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: 1. Brass ball valves. 2. Bronze ball valves. 3. Iron ball valves. 4. Iron, single-flange butterfly valves. 5. Bronze lift check valves. 6. Bronze swing check valves. 7. Iron swing check valves. 8. Bronze globe valves. 9. Iron gate valves. 1.3 DEFINITIONS A. CWP: Cold working pressure. B. NRS: Non-rising stem. C. OS&Y: Outside screw and yoke. D. EPDM: Ethylene propylene-diene terpolymer rubber. E. NBR: Acrylonitrile-butadiene, Buna-N, or nitrile rubber. 1.4 ACTION SUBMITTALS A. Product Data: For each type of valve. 1. Certification that products comply with NSF 61 Annex G and NSF DELIVERY, STORAGE, AND HANDLING A. Prepare valves for shipping as follows: General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

14 1. Protect internal parts against rust and corrosion. 2. Protect threads, flange faces, grooves, weld ends, and soldered ends. 3. Set ball valves open to minimize exposure of functional surfaces. 4. Set butterfly valves closed or slightly open. 5. Set check valves in either closed or open position. 6. Set gate valves closed to prevent rattling. B. Use the following precautions during storage: 1. Maintain valve end protection. 2. Store valves indoors and maintain at higher-than-ambient-dew-point temperature. If outdoor storage is necessary, store valves off the ground in watertight enclosures. C. Use sling to handle large valves; rig sling to avoid damage to exposed parts. Do not use operating handles or stems as lifting or rigging points. PART 2 - PRODUCTS 2.1 GENERAL REQUIREMENTS FOR VALVES A. Source Limitations for Valves: Obtain each type of valve from single source from single manufacturer. B. ASME Compliance: 1. ASME B for threads for threaded end valves. 2. ASME B16.1 for flanges on iron valves. 3. ASME B16.5 for flanges on steel valves. 4. ASME B16.10 and ASME B16.34 for ferrous valve dimensions and design criteria. 5. ASME B16.18 for solder-joint connections. 6. ASME B31.9 for building services piping valves. C. NSF Compliance: NSF 61 Annex G and NSF 372 for valve materials for potable-water service. D. Bronze valves shall be made with dezincification-resistant materials. Bronze valves made with copper alloy (brass) containing more than 15 percent zinc are not permitted. E. Valve Pressure-Temperature Ratings: Not less than indicated and as required for system pressures and temperatures. F. Valve Sizes: Same as upstream piping unless otherwise indicated. G. Valve Actuator Types: 1. Gear Actuator: For quarter-turn valves NPS 6 and larger. 2. Hand lever: For quarter-turn valves smaller than NPS 6. H. Valves in Insulated Piping: 1. Include 2-inch stem extensions. General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

15 2. Extended operating handles of non-thermal-conductive material and protective sleeves that allow operation of valves without breaking vapor seals or disturbing insulation. 3. Memory stops that are fully adjustable after insulation is applied. I. Gate Valve Valve Bypass and Drain Connections: MSS SP BRASS BALL VALVES A. Brass Ball Valves, Two-Piece with Full Port and Brass Trim: 1. Description: a. Standard: MSS SP-110. b. CWP Rating: 600 psig. c. Body Design: Two piece. d. Body Material: Forged brass. e. Ends: Threaded and soldered. f. Seats: PTFE. g. Stem: Brass. h. Ball: Chrome-plated brass. i. Port: Full. B. Brass Ball Valves, Two-Piece with Full Port and Stainless-Steel Trim: 1. Description: a. Standard: MSS SP-110. b. CWP Rating: 600 psig. c. Body Design: Two piece. d. Body Material: Forged brass. e. Ends: Threaded and soldered. f. Seats: PTFE. g. Stem: Stainless steel. h. Ball: Stainless steel, vented. i. Port: Full. C. Brass Ball Valves, Three-Piece with Full Port and Stainless-Steel Trim: 1. Description: a. Standard: MSS SP-110. b. CWP Rating: 600 psig. c. Body Design: Three piece. d. Body Material: Forged brass. e. Ends: Threaded and soldered. f. Seats: PTFE or TFE. g. Stem: Stainless steel. h. Ball: Stainless steel, vented. i. Port: Full. General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

16 2.3 BRONZE BALL VALVES A. Bronze Ball Valves, Two-Piece with Full Port and Stainless-Steel Trim: 1. Description: a. Standard: MSS SP-110. b. CWP Rating: 600 psig. c. Body Design: Two piece. d. Body Material: Bronze. e. Ends: Threaded or soldered. f. Seats: PTFE. g. Stem: Stainless steel. h. Ball: Stainless steel, vented. i. Port: Full. B. Bronze Ball Valves, Two-Piece with Regular Port and Stainless-Steel Trim: 1. Description: a. Standard: MSS SP-110. b. CWP Rating: 600 psig. c. Body Design: Two piece. d. Body Material: Bronze. e. Ends: Threaded. f. Seats: PTFE. g. Stem: Stainless steel. h. Ball: Stainless steel, vented. i. Port: Regular. C. Bronze Ball Valves, Three-Piece with Full Port and Stainless-Steel Trim: 1. Description: a. Standard: MSS SP-110. b. CWP Rating: 600 psig. c. Body Design: Three piece. d. Body Material: Bronze. e. Ends: Threaded. f. Seats: PTFE. g. Stem: Stainless steel. h. Ball: Stainless steel, vented. i. Port: Full. 2.4 IRON BALL VALVES A. Iron Ball Valves, Class 125: 1. Description: General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

17 a. Standard: MSS SP-72. b. CWP Rating: 200 psig. c. Body Design: Split body. d. Body Material: ASTM A 126, gray iron. e. Ends: Flanged or threaded. f. Seats: PTFE. g. Stem: Stainless steel. h. Ball: Stainless steel. i. Port: Full. 2.5 IRON, SINGLE-FLANGE BUTTERFLY VALVES A. Iron, Single-Flange Butterfly Valves with Stainless-Steel Disc: 1. Description: a. Standard: MSS SP-67, Type I. b. CWP Rating: 200 psig. c. Body Design: Lug type; suitable for bidirectional dead-end service at rated pressure without use of downstream flange. d. Body Material: ASTM A 126, cast iron or ASTM A 536, ductile iron. e. Seat: EPDM. f. Stem: One- or two-piece stainless steel. g. Disc: Stainless steel. 2.6 BRONZE LIFT CHECK VALVES A. Bronze Lift Check Valves with Bronze Disc, Class 125: 1. Description: a. Standard: MSS SP-80, Type 1. b. CWP Rating: 200 psig. c. Body Design: Vertical flow. d. Body Material: ASTM B 61 or ASTM B 62, bronze. e. Ends: Threaded or soldered. f. Disc: Bronze. 2.7 BRONZE SWING CHECK VALVES A. Bronze Swing Check Valves with Bronze Disc, Class 125: 1. Description: a. Standard: MSS SP-80, Type 3. b. CWP Rating: 200 psig. c. Body Design: Horizontal flow. d. Body Material: ASTM B 62, bronze. General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

18 e. Ends: Threaded or soldered. See valve schedule articles. f. Disc: Bronze. 2.8 IRON SWING CHECK VALVES A. Iron Swing Check Valves with Metal Seats, Class 125: 1. Description: a. Standard: MSS SP-71, Type I. b. CWP Rating: 200 psig. c. Body Design: Clear or full waterway. d. Body Material: ASTM A 126, gray iron with bolted bonnet. e. Ends: Flanged or threaded. See valve schedule articles. f. Trim: Bronze. g. Gasket: Asbestos free. 2.9 BRONZE GLOBE VALVES A. Class 125, Bronze Globe Valves with Bronze Disc: 1. Description: a. Standard: MSS SP-80, Type 1. b. CWP Rating: 200 psig. c. Body Material: ASTM B 62, bronze with integral seat and screw-in bonnet. d. Ends: Threaded or solder joint. e. Stem and Disc: Bronze. f. Packing: Asbestos free. g. Hand wheel: Malleable iron, bronze, or aluminum IRON GATE VALVES A. Iron Gate Valves, NRS, Class 150: 1. Description: a. Standard: MSS SP-70, Type I. b. CWP Rating: 200 psig. c. Body Material: Gray iron with bolted bonnet. d. Ends: Flanged. e. Trim: Bronze. f. Disc: Solid wedge. g. Packing and Gasket: Asbestos free. General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

19 PART 3 - EXECUTION 3.1 EXAMINATION A. Examine valve interior for cleanliness, freedom from foreign matter, and corrosion. Remove special packing materials, such as blocks, used to prevent disc movement during shipping and handling. B. Operate valves in positions from fully open to fully-closed. Examine guides and seats made accessible by such operations. C. Examine threads on valve and mating pipe for form and cleanliness. D. Examine mating flange faces for conditions that might cause leakage. Check bolting for proper size, length, and material. Verify that gasket is of proper size, that its material composition is suitable for service, and that it is free from defects and damage. E. Do not attempt to repair defective valves; replace with new valves. 3.2 VALVE INSTALLATION A. Install valves with unions or flanges at each piece of equipment arranged to allow service, maintenance, and equipment removal without system shutdown. B. Locate valves for easy access and provide separate support where necessary. C. Install valves in horizontal piping with stem at or above center of pipe. D. Install valves in position to allow full stem movement. E. Install valve tags. Comply with requirements in Section "Identification for Plumbing Piping and Equipment" for valve tags and schedules. F. Install check valves for proper direction of flow and as follows: 1. Swing Check Valves: In horizontal position with hinge pin level. 2. Lift Check Valves: With stem upright and plumb. 3.3 ADJUSTING A. Adjust or replace valve packing after piping systems have been tested and put into service but before final adjusting and balancing. Replace valves if persistent leaking occurs. 3.4 GENERAL REQUIREMENTS FOR VALVE APPLICATIONS A. If valve applications are not indicated, use the following: 1. Shutoff Service: Ball or butterfly valves. General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

20 2. Throttling Service: Globe, ball, or butterfly valves. 3. Pump-Discharge Check Valves: a. NPS 2 and Smaller: Bronze swing check valves with bronze disc. b. NPS 2-1/2 and Larger for Domestic Water: Iron swing check valves with lever and weight or with spring or iron, center-guided, metal-seat check valves. B. If valves with specified CWP ratings are unavailable, the same types of valves with higher CWP ratings may be substituted. C. Select valves with the following end connections: 1. For Copper Tubing, NPS 2 and Smaller: Threaded ends except where solder-joint valveend option is indicated in valve schedules below. 2. For Copper Tubing, NPS 2-1/2 to NPS 4: Flanged ends except where threaded valve-end option is indicated in valve schedules below. 3. For Copper Tubing, NPS 5 and Larger: Flanged ends. 4. For Steel Piping, NPS 2 and Smaller: Threaded ends. 5. For Steel Piping, NPS 2-1/2 and Larger: Flanged ends except where threaded valve-end option is indicated in valve schedules below. 3.5 DOMESTIC HOT- AND COLD-WATER VALVE SCHEDULE A. Pipe NPS 2 and Smaller: 1. Ball Valves: a. Bronze and Brass Valves: May be provided with solder-joint ends instead of threaded ends. b. Brass ball valves, two-piece with full port and stainless-steel trim. c. Bronze ball valves, two-piece with full port and stainless-steel trim. d. Brass ball valves, three-piece with full port and stainless-steel trim. e. Bronze ball valves, three-piece with full port and stainless-steel trim. 2. Check Valves: a. Bronze swing check valves with bronze disc, Class 125, with soldered or threaded end connections. B. Pipe NPS 2-1/2 and Larger: 1. Ball Valves: a. Iron Valves, NPS 2-1/2 to NPS 4: May be provided with threaded ends instead of flanged ends. b. Iron ball valves, Class Butterfly Valves: a. Iron, Single-Flange Butterfly Valves: 200 CWP, EPDM seat, stainless-steel disc. 3. Check Valves: a. Iron swing check valves with metal seats, Class 125, with threaded of flanged end connections. General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

21 4. Iron Gate Valves: a. NRS, Class 125 with flanged ends. END OF SECTION General Duty Valves for Plumbing Piping Advanced Design and Construction Facility (0336)

22 SECTION FUEL GAS PIPING PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: 1. Pipes, tubes, and fittings. 2. Piping specialties. 3. Piping and tubing joining materials. 4. Valves. 5. Pressure regulators. 6. Concrete bases. 1.3 DEFINITIONS A. Finished Spaces: Spaces other than mechanical and electrical equipment rooms, furred spaces, pipe and duct shafts, unheated spaces immediately below roof, spaces above ceilings, unexcavated spaces, crawlspaces, and tunnels. B. Exposed, Interior Installations: Exposed to view indoors. Examples include finished occupied spaces and mechanical equipment rooms. C. Exposed, Exterior Installations: Exposed to view outdoors or subject to outdoor ambient temperatures and weather conditions. Examples include rooftop locations. 1.4 PERFORMANCE REQUIREMENTS A. Minimum Operating-Pressure Ratings: 1. Piping and Valves: 100 psig minimum unless otherwise indicated. 2. Service Regulators: 100 psig minimum unless otherwise indicated. B. Natural-Gas System Pressure within Buildings: 0.5 psig or less. 1.5 ACTION SUBMITTALS A. Product Data: For each type of the following: Fuel Gas Piping Advanced Design and Construction Facility (0336)

23 1. Piping specialties. 2. Corrugated, stainless-steel tubing with associated components. 3. Valves. Include pressure rating, capacity, settings, and electrical connection data of selected models. 4. Pressure regulators. Indicate pressure ratings and capacities. 5. Dielectric fittings. 1.6 INFORMATIONAL SUBMITTALS A. Welding certificates. B. Field quality-control reports. 1.7 CLOSEOUT SUBMITTALS A. Operation and Maintenance Data: For pressure regulators to include in emergency, operation, and maintenance manuals. 1.8 QUALITY ASSURANCE A. Steel Support Welding Qualifications: Qualify procedures and personnel according to AWS D1.1/D1.1M, "Structural Welding Code - Steel." B. Pipe Welding Qualifications: Qualify procedures and operators according to ASME Boiler and Pressure Vessel Code. C. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. 1.9 DELIVERY, STORAGE, AND HANDLING A. Deliver pipes and tubes with factory-applied end caps. Maintain end caps through shipping, storage, and handling to prevent pipe end damage and to prevent entrance of dirt, debris, and moisture. B. Store and handle pipes and tubes having factory-applied protective coatings to avoid damaging coating, and protect from direct sunlight. C. Protect stored PE pipes and valves from direct sunlight COORDINATION A. Coordinate sizes and locations of concrete bases with actual equipment provided. B. Coordinate requirements for access panels and doors for valves installed concealed behind finished surfaces. Comply with requirements in Section "Access Doors and Frames." Fuel Gas Piping Advanced Design and Construction Facility (0336)

24 PART 2 - PRODUCTS 2.1 PIPES, TUBES, AND FITTINGS A. Steel Pipe: ASTM A 53/A 53M, black steel, Schedule 40, Type E or S, Grade B. 1. Malleable-Iron Threaded Fittings: ASME B16.3, Class 150, standard pattern. 2. Wrought-Steel Welding Fittings: ASTM A 234/A 234M for butt welding and socket welding. 3. Unions: ASME B16.39, Class 150, malleable iron with brass-to-iron seat, ground joint, and threaded ends. 4. Forged-Steel Flanges and Flanged Fittings: ASME B16.5, minimum Class 150, including bolts, nuts, and gaskets of the following material group, end connections, and facings: a. Material Group: 1.1. b. End Connections: Threaded or butt welding to match pipe. c. Lapped Face: Not permitted underground. d. Gasket Materials: ASME B16.20, metallic, flat, asbestos free, aluminum o-rings, and spiral-wound metal gaskets. e. Bolts and Nuts: ASME B18.2.1, carbon steel aboveground and stainless steel underground. 5. Protective Coating for Underground Piping: Factory-applied, three-layer coating of epoxy, adhesive, and PE. a. Joint Cover Kits: Epoxy paint, adhesive, and heat-shrink PE sleeves. 6. Mechanical Couplings: a. Steel flanges and tube with epoxy finish. b. Buna-nitrile seals. c. Steel bolts, washers, and nuts. d. Coupling shall be capable of joining PE pipe to PE pipe, steel pipe to PE pipe, or steel pipe to steel pipe. e. Steel body couplings installed underground on plastic pipe shall be factory equipped with anode. 7. Tubing: ASTM A 240/A 240M, corrugated, Series 300 stainless steel. 8. Coating: PE with flame retardant. a. Surface-Burning Characteristics: As determined by testing identical products according to ASTM E 84 by a qualified testing agency. Identify products with appropriate markings of applicable testing agency. 1) Flame-Spread Index: 25 or less. 2) Smoke-Developed Index: 50 or less. 9. Fittings: Copper-alloy mechanical fittings with ends made to fit and listed for use with corrugated stainless-steel tubing and capable of metal-to-metal seal without gaskets. Include brazing socket or threaded ends complying with ASME B Fuel Gas Piping Advanced Design and Construction Facility (0336)

25 10. Striker Plates: Steel, designed to protect tubing from penetrations. 11. Manifolds: Malleable iron or steel with factory-applied protective coating. Threaded connections shall comply with ASME B for pipe inlet and corrugated tubing outlets. 12. Protective Coating for Underground Tubing: Factory-applied, extruded PE a minimum of inch thick. 13. Flare Fittings: Comply with ASME B16.26 and SAE J513. a. Copper fittings with long nuts. b. Metal-to-metal compression seal without gasket. c. Dryseal threads complying with ASME B Protective Coating for Underground Tubing: Factory-applied, extruded PE a minimum of inch thick. B. PE Pipe: ASTM D 2513, SDR PE Fittings: ASTM D 2683, socket-fusion type or ASTM D 3261, butt-fusion type with dimensions matching PE pipe. 2. PE Transition Fittings: Factory-fabricated fittings with PE pipe complying with ASTM D 2513, SDR 11; and steel pipe complying with ASTM A 53/A 53M, black steel, Schedule 40, Type E or S, Grade B. 3. Anodeless Service-Line Risers: Factory fabricated and leak tested. a. Underground Portion: PE pipe complying with ASTM D 2513, SDR 11 inlet. b. Casing: Steel pipe complying with ASTM A 53/A 53M, Schedule 40, black steel, Type E or S, Grade B, with corrosion-protective coating covering. c. Aboveground Portion: PE transition fitting. d. Outlet shall be threaded or flanged or suitable for welded connection. e. Tracer wire connection. f. Ultraviolet shield. g. Stake supports with factory finish to match steel pipe casing or carrier pipe. 4. Transition Service-Line Risers: Factory fabricated and leak tested. a. Underground Portion: PE pipe complying with ASTM D 2513, SDR 11 inlet connected to steel pipe complying with ASTM A 53/A 53M, Schedule 40, Type E or S, Grade B, with corrosion-protective coating for aboveground outlet. b. Outlet shall be threaded or flanged or suitable for welded connection. c. Bridging sleeve over mechanical coupling. d. Factory-connected anode. e. Tracer wire connection. f. Ultraviolet shield. g. Stake supports with factory finish to match steel pipe casing or carrier pipe. h. PE body with molded-in, stainless-steel support ring. i. Buna-nitrile seals. j. Acetal collets. k. Electro-zinc-plated steel stiffener. l. m. Fiber-reinforced plastic body. Fuel Gas Piping Advanced Design and Construction Facility (0336)

26 n. PE body tube. o. Buna-nitrile seals. p. Acetal collets. q. Stainless-steel bolts, nuts, and washers. 5. Steel Mechanical Couplings: Capable of joining plain-end PE pipe to PE pipe, steel pipe to PE pipe, or steel pipe to steel pipe. a. Steel flanges and tube with epoxy finish. b. Buna-nitrile seals. c. Steel bolts, washers, and nuts. d. Factory-installed anode for steel-body couplings installed underground. 2.2 PIPING SPECIALTIES A. Appliance Flexible Connectors: 1. Indoor, Fixed-Appliance Flexible Connectors: Comply with ANSI Z Indoor, Movable-Appliance Flexible Connectors: Comply with ANSI Z Outdoor, Appliance Flexible Connectors: Comply with ANSI Z Corrugated stainless-steel tubing with polymer coating. 5. Operating-Pressure Rating: 0.5 psig. 6. End Fittings: Zinc-coated steel. 7. Threaded Ends: Comply with ASME B Maximum Length: 72 inches B. Quick-Disconnect Devices: Comply with ANSI Z Copper-alloy convenience outlet and matching plug connector. 2. Nitrile seals. 3. Hand operated with automatic shutoff when disconnected. 4. For indoor or outdoor applications. 5. Adjustable, retractable restraining cable. C. Y-Pattern Strainers: 1. Body: ASTM A 126, Class B, cast iron with bolted cover and bottom drain connection. 2. End Connections: Threaded ends for NPS 2 and smaller; flanged ends for NPS 2-1/2 and larger. 3. CWP Rating: 125 psig. 4. Strainer Screen: 40 mesh startup strainer, and perforated stainless-steel basket with 50 percent free area. 5. CWP Rating: 125 psig. D. T-Pattern Strainers: 1. Body: Ductile or malleable iron with removable access coupling and end cap for strainer maintenance. 2. End Connections: Grooved ends. Fuel Gas Piping Advanced Design and Construction Facility (0336)

27 3. Strainer Screen: 40 mesh startup strainer, and perforated stainless-steel basket with 57 percent free area. 4. CWP Rating: 750 psig. E. Weatherproof Vent Cap: Cast- or malleable-iron increaser fitting with corrosion-resistant wire screen, with free area at least equal to cross-sectional area of connecting pipe and threaded-end connection. 2.3 JOINING MATERIALS A. Joint Compound and Tape: Suitable for natural gas. B. Welding Filler Metals: Comply with AWS D10.12/D10.12M for welding materials appropriate for wall thickness and chemical analysis of steel pipe being welded. C. Brazing Filler Metals: Alloy with melting point greater than 1000 deg. F complying with AWS A5.8/A5.8M. Brazing alloys containing more than 0.05 percent phosphorus are prohibited. 2.4 MANUAL GAS SHUTOFF VALVES A. General Requirements for Metallic Valves, NPS 2 and Smaller: Comply with ASME B CWP Rating: 125 psig. 2. Threaded Ends: Comply with ASME B Dryseal Threads on Flare Ends: Comply with ASME B Tamperproof Feature: Locking feature for valves indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas Shutoff Valve Schedule" Articles. 5. Listing: Listed and labeled by an NRTL acceptable to authorities having jurisdiction for valves 1 inch and smaller. 6. Service Mark: Valves 1-1/4 inches to NPS 2 shall have initials "WOG" permanently marked on valve body. B. General Requirements for Metallic Valves, NPS 2-1/2 and Larger: Comply with ASME B CWP Rating: 125 psig. 2. Flanged Ends: Comply with ASME B16.5 for steel flanges. 3. Tamperproof Feature: Locking feature for valves indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas Shutoff Valve Schedule" Articles. 4. Service Mark: Initials "WOG" shall be permanently marked on valve body. C. Two-Piece, Full-Port, Bronze Ball Valves with Bronze Trim: MSS SP Body: Bronze, complying with ASTM B Ball: Chrome-plated bronze. 3. Stem: Bronze; blowout proof. 4. Seats: Reinforced TFE; blowout proof. 5. Packing: Threaded-body packnut design with adjustable-stem packing. Fuel Gas Piping Advanced Design and Construction Facility (0336)

28 6. Ends: Threaded, flared, or socket as indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas Shutoff Valve Schedule" Articles. 7. CWP Rating: 600 psig. 8. Listing: Valves NPS 1 and smaller shall be listed and labeled by an NRTL acceptable to authorities having jurisdiction. 9. Service: Suitable for natural-gas service with "WOG" indicated on valve body. D. Bronze Plug Valves: MSS SP Body: Bronze, complying with ASTM B Plug: Bronze. 3. Ends: Threaded, socket, or flanged as indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas Shutoff Valve Schedule" Articles. 4. Operator: Square head or lug type with tamperproof feature where indicated. 5. Pressure Class: 125 psig. 6. Listing: Valves NPS 1 and smaller shall be listed and labeled by an NRTL acceptable to authorities having jurisdiction. 7. Service: Suitable for natural-gas service with "WOG" indicated on valve body. E. Cast-Iron, Non-lubricated Plug Valves: MSS SP Body: Cast iron, complying with ASTM A 126, Class B. 2. Plug: Bronze or nickel-plated cast iron. 3. Seat: Coated with thermoplastic. 4. Stem Seal: Compatible with natural gas. 5. Ends: Threaded or flanged as indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas Shutoff Valve Schedule" Articles. 6. Operator: Square head or lug type with tamperproof feature where indicated. 7. Pressure Class: 125 psig. 8. Listing: Valves NPS 1 and smaller shall be listed and labeled by an NRTL acceptable to authorities having jurisdiction. 9. Service: Suitable for natural-gas service with "WOG" indicated on valve body. F. Cast-Iron, Lubricated Plug Valves: MSS SP Body: Cast iron, complying with ASTM A 126, Class B. 2. Plug: Bronze or nickel-plated cast iron. 3. Seat: Coated with thermoplastic. 4. Stem Seal: Compatible with natural gas. 5. Ends: Threaded or flanged as indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas Shutoff Valve Schedule" Articles. 6. Operator: Square head or lug type with tamperproof feature where indicated. 7. Pressure Class: 125 psig. 8. Listing: Valves NPS 1 and smaller shall be listed and labeled by an NRTL acceptable to authorities having jurisdiction. 9. Service: Suitable for natural-gas service with "WOG" indicated on valve body. 2.5 EARTHQUAKE VALVES A. Earthquake Valves: Comply with ASCE 25. Fuel Gas Piping Advanced Design and Construction Facility (0336)

29 1. Listing: Listed and labeled by an NRTL acceptable to authorities having jurisdiction. 2. Maximum Operating Pressure: 0.5 psig. 3. Cast-aluminum body with stainless-steel internal parts. 4. Nitrile-rubber, reset-stem o-ring seal. 5. Valve position, open or closed, indicator. 6. Composition valve seat with clapper held by spring or magnet locking mechanism. 7. Level indicator. 8. End Connections: Threaded for valves NPS 2 and smaller; flanged for valves NPS 2-1/2 and larger. 2.6 PRESSURE REGULATORS A. General Requirements: 1. Single stage and suitable for natural gas. 2. Steel jacket and corrosion-resistant components. 3. Elevation compensator. 4. End Connections: Threaded for regulators NPS 2 and smaller; flanged for regulators NPS 2-1/2 and larger. B. Service Pressure Regulators: Comply with ANSI Z Body and Diaphragm Case: Cast iron or die-cast aluminum. 2. Springs: Zinc-plated steel; interchangeable. 3. Diaphragm Plate: Zinc-plated steel. 4. Seat Disc: Nitrile rubber resistant to gas impurities, abrasion, and deformation at the valve port. 5. Orifice: Aluminum; interchangeable. 6. Seal Plug: Ultraviolet-stabilized, mineral-filled nylon. 7. Single-port, self-contained regulator with orifice no larger than required at maximum pressure inlet, and no pressure sensing piping external to the regulator. 8. Pressure regulator shall maintain discharge pressure setting downstream, and not exceed 150 percent of design discharge pressure at shutoff. 9. Overpressure Protection Device: Factory mounted on pressure regulator. 10. Atmospheric Vent: Factory- or field-installed, stainless-steel screen in opening if not connected to vent piping. 11. Maximum Inlet Pressure: 100 psig. C. Line Pressure Regulators: Comply with ANSI Z Body and Diaphragm Case: Cast iron or die-cast aluminum. 2. Springs: Zinc-plated steel; interchangeable. 3. Diaphragm Plate: Zinc-plated steel. 4. Seat Disc: Nitrile rubber resistant to gas impurities, abrasion, and deformation at the valve port. 5. Orifice: Aluminum; interchangeable. 6. Seal Plug: Ultraviolet-stabilized, mineral-filled nylon. 7. Single-port, self-contained regulator with orifice no larger than required at maximum pressure inlet, and no pressure sensing piping external to the regulator. Fuel Gas Piping Advanced Design and Construction Facility (0336)

30 8. Pressure regulator shall maintain discharge pressure setting downstream, and not exceed 150 percent of design discharge pressure at shutoff. 9. Overpressure Protection Device: Factory mounted on pressure regulator. 10. Atmospheric Vent: Factory- or field-installed, stainless-steel screen in opening if not connected to vent piping. 11. Maximum Inlet Pressure: 2 psig. 2.7 DIELECTRIC FITTINGS A. General Requirements: Assembly of copper alloy and ferrous materials with separating nonconductive insulating material. Include end connections compatible with pipes to be joined. B. Dielectric Unions: 1. Description: a. Standard: ASSE b. Pressure Rating: 125 psig minimum at 180 deg. F. c. End Connections: Solder-joint copper alloy and threaded ferrous. C. Dielectric Flanges: 1. Description: a. Standard: ASSE b. Factory-fabricated, bolted, companion-flange assembly. c. Pressure Rating: 125 psig minimum at 180 deg. d. End Connections: Solder-joint copper alloy and threaded ferrous; threaded solderjoint copper alloy and threaded ferrous. D. Dielectric-Flange Insulating Kits: 1. Description: a. Non-conducting materials for field assembly of companion flanges. b. Pressure Rating: 150 psig. c. Gasket: Neoprene or phenolic. d. Bolt Sleeves: Phenolic or polyethylene. e. Washers: Phenolic with steel backing washers. 2.8 LABELING AND IDENTIFYING A. Detectable Warning Tape: Acid- and alkali-resistant, PE film warning tape manufactured for marking and identifying underground utilities, a minimum of 6 inches wide and 4 mils thick, continuously inscribed with a description of utility, with metallic core encased in a protective jacket for corrosion protection, detectable by metal detector when tape is buried up to 30 inches deep; colored yellow. Fuel Gas Piping Advanced Design and Construction Facility (0336)

31 PART 3 - EXECUTION 3.1 EXAMINATION A. Examine roughing-in for natural-gas piping system to verify actual locations of piping connections before equipment installation. B. Proceed with installation only after unsatisfactory conditions have been corrected. 3.2 PREPARATION A. Inspect natural-gas piping according to the International Fuel Gas Code to determine that natural-gas utilization devices are turned off in piping section affected. B. Comply with the International Fuel Gas Code requirements for prevention of accidental ignition. 3.3 OUTDOOR PIPING INSTALLATION A. Comply with the International Fuel Gas Code for installation and purging of natural-gas piping. B. Install underground, natural-gas piping buried at least 18 inches below finished grade. Comply with requirements in Section "Earth Moving" for excavating, trenching, and backfilling. 1. If natural-gas piping is installed less than 18 inches below finished grade, install it in containment conduit. C. Install underground, PE, natural-gas piping according to ASTM D D. Steel Piping with Protective Coating: 1. Apply joint cover kits to pipe after joining to cover, seal, and protect joints. 2. Repair damage to PE coating on pipe as recommended in writing by protective coating manufacturer. 3. Replace pipe having damaged PE coating with new pipe. E. Copper Tubing with Protective Coating: 1. Apply joint cover kits over tubing to cover, seal, and protect joints. 2. Repair damage to PE coating on pipe as recommended in writing by protective coating manufacturer. F. Install fittings for changes in direction and branch connections. G. Install pressure gage upstream and downstream from each service regulator. Pressure gages are specified in Section "Meters and Gages for HVAC Piping." Fuel Gas Piping Advanced Design and Construction Facility (0336)

32 3.4 INDOOR PIPING INSTALLATION A. Comply with the International Fuel Gas Code for installation and purging of natural-gas piping. B. Drawing plans, schematics, and diagrams indicate general location and arrangement of piping systems. Indicated locations and arrangements are used to size pipe and calculate friction loss, expansion, and other design considerations. Install piping as indicated unless deviations to layout are approved on Coordination Drawings. C. Arrange for pipe spaces, chases, slots, sleeves, and openings in building structure during progress of construction, to allow for mechanical installations. D. Install piping in concealed locations unless otherwise indicated and except in equipment rooms and service areas. E. Install piping indicated to be exposed and piping in equipment rooms and service areas at right angles or parallel to building walls. Diagonal runs are prohibited unless specifically indicated otherwise. F. Install piping above accessible ceilings to allow sufficient space for ceiling panel removal. G. Locate valves for easy access. H. Install natural-gas piping at uniform grade of 2 percent down toward drip and sediment traps. I. Install piping free of sags and bends. J. Install fittings for changes in direction and branch connections. K. Verify final equipment locations for roughing-in. L. Comply with requirements in Sections specifying gas-fired appliances and equipment for roughing-in requirements. M. Drips and Sediment Traps: Install drips at points where condensate may collect, including service-meter outlets. Locate where accessible to permit cleaning and emptying. Do not install where condensate is subject to freezing. 1. Construct drips and sediment traps using tee fitting with bottom outlet plugged or capped. Use nipple a minimum length of 3 pipe diameters, but not less than 3 inches long and same size as connected pipe. Install with space below bottom of drip to remove plug or cap. N. Extend relief vent connections for service regulators, line regulators, and overpressure protection devices to outdoors and terminate with weatherproof vent cap. O. Conceal pipe installations in walls, pipe spaces, utility spaces, above ceilings, below grade or floors, and in floor channels unless indicated to be exposed to view. P. Concealed Location Installations: Except as specified below, install concealed natural-gas piping and piping installed under the building in containment conduit constructed of steel pipe Fuel Gas Piping Advanced Design and Construction Facility (0336)