Part I ‒ Administration

Chapter 1 Administration

Part II ‒ Definitions

Chapter 2 Definitions

Part III ‒ Building Planning and Construction

Chapter 3 Building Planning

Chapter 4 Foundations

Chapter 5 Floors

Chapter 6 Wall Construction

Chapter 7 Wall Covering

Chapter 8 Roof-Ceiling Construction

Chapter 9 Roof Assemblies

Chapter 10 Chimneys and Fireplaces

Part IV ‒ Energy Conservation

Chapter 11 Energy Efficiency

Part V ‒ Mechanical

Chapter 12 Mechanical Administration

Chapter 13 General Mechanical System Requirements

Chapter 14 Heating and Cooling Equipment

Chapter 15 Exhaust Systems

Chapter 16 Duct Systems

Chapter 17 Combustion Air

Chapter 18 Chimneys and Vents

Chapter 19 Special Fuel-Burning Equipment

Chapter 20 Boilers and Water Heaters

Chapter 21 Hydronic Piping

Chapter 22 Special Piping and Storage Systems

Chapter 23 Solar Systems

Part VI ‒ Fuel Gas

Chapter 24 Fuel Gas

Part VII ‒ Plumbing

Chapter 25 Plumbing Administration

Chapter 26 General Plumbing Requirements

Chapter 27 Plumbing Fixtures

Chapter 28 Water Heaters

Chapter 29 Water Supply and Distribution

Chapter 30 Sanitary Drainage

Chapter 31 Vents

Chapter 32 Traps

Part VIII ‒ Electrical

Chapter 33 General Requirements

Chapter 34 Electrical Definitions

Chapter 35 Services

Chapter 36 Branch Circuit and Feeder Requirements

Chapter 37 Wiring Methods

Chapter 38 Power and Lighting Distribution

Chapter 39 Devices and Luminaires

Chapter 40 Appliance Installation

Chapter 41 Swimming Pools

Chapter 42 Class 2 Remote-Control‚ Signaling and Power-Limited Circuits

Part IX ‒ Referenced Standards

Chapter 43 Referenced Standards

Appendix A Sizing and Capacities of Gas Piping

Appendix B Sizing of Venting Systems Serving Appliances Equipped With Draft Hoods

Appendix C Plumbing Sanitary Drainage Fittings

Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation

Appendix E Manufactured Housing Used as Dwellings

Appendix F Reserved

Appendix G Swimming Pools‚ Spas and Hot Tubs

Appendix H Patio Covers

Appendix I Reserved

Appendix J Existing Buildings and Structures

Appendix K Sound Transmission

Appendix L Reserved

Appendix M Reserved

Appendix N Structural Safety

Appendix O Reserved

Appendix P Reserved

Appendix Q Reserved

Hydronic piping shall conform to Table M2101.1. Approved piping, valves, fittings and connections shall be installed in accordance with the manufacturer’s installation instructions. Pipe and fittings shall be rated for use at the operating temperature and pressure of the hydronic system. Used pipe, fittings, valves or other materials shall be free of foreign materials.

TABLE M2101.1 HYDRONIC PIPING MATERIALS


MATERIAL USE CODEa STANDARDb JOINTS NOTES
Brass pipe 1 ASTM B 43 Brazed, welded, threaded, mechanical and flanged fittings  
Brass tubing 1 ASTM B 135 Brazed, soldered and mechanical fittings  
Chlorinated poly (vinyl chloride) (CPVC) pipe and tubing 1, 2, 3 ASTM D 2846 Solvent cement joints, compression joints and threaded adapters  
Copper pipe 1 ASTM B 42, B 302 Brazed, soldered and mechanical fittings threaded, welded and flanged  
Copper tubing (type K, L or M) 1, 2 ASTM B 75, B 88, B 251, B 306 Brazed, soldered and flared mechanical fittings Joints embedded in concrete
Cross-linked polyethylene (PEX) 1, 2, 3 ASTM F 876, F 877 (See PEX fittings) Install in accordance with manufacturer’s instructions.
Cross-linked polyethylene/aluminum/cross-linked polyethylene-(PEX-AL-PEX) pressure pipe 1, 2 ASTM F 1281 or CSA B137.10 Mechanical, crimp/insert Install in accordance with manufacturer’s instructions.
PEX Fittings   ASTM F 1807
ASTM F 1960
ASTM F 2098
Copper-crimp/insert fittings, cold expansion fittings, stainless steel clamp, insert fittings Install in accordance with manufacturer’s instructions
Plastic fittings PEX   ASTM F 1807    
Polyethylene (PE) pipe, tubing and fittings (for ground source heat pump loop systems) 1, 2, 4 ASTM D 2513;
ASTM D 3350;
ASTM D 2513;
ASTM D 3035;
ASTM D 2447;
ASTM D 2683;
ASTM F 1055;
ASTM D 2837;
ASTM D 3350;
ASTM D 1693
Heat-fusion  
Polyproplylene (PP) 1, 2, 3 ISO 15874
ASTM F 2389
Heat-fusion joints, mechanical fittings, threaded adapters, compression joints
Soldering fluxes 1 ASTM B 813 Copper tube joints
Steel pipe 1, 2 ASTM A 53;
A 106
Brazed, welded, threaded, flanged and mechanical fittings Joints in concrete shall be welded. Galvanized pipe shall not be welded or brazed.
Steel tubing 1 ASTM A 254 Mechanical fittings, welded


For SI: °C = [(°F)-32]/1.8.

a. Use code:

1. Above ground.

2. Embedded in radiant systems.

3. Temperatures below 180°F only.

4. Low temperature (below 130°F) applications only.

b. Standards as listed in Chapter 43.
Hydronic piping systems shall be installed to permit draining the system. When the system drains to the plumbing drainage system, the installation shall conform to the requirements of Chapters 25 through 32 of this code.
The potable water system shall be protected from backflow in accordance with the provisions listed in Section P2902.
Openings through concrete or masonry building elements shall be sleeved.
A hydronic piping system shall not be in direct contact with any building material that causes the piping material to degrade or corrode.
Wood-framed structural members shall be drilled, notched or altered in accordance with the provisions of Sections R502.6, R502.8, R602.6, R602.6.1, R802.6 and R802.7. Holes in cold-formed, steel-framed, load-bearing members shall be permitted only in accordance with Sections R505.2, R603.2 and R804.2. In accordance with the provisions of Sections R505.3.5, R603.3.4 and R804.3.5, cutting and notching of flanges and lips of cold-formed, steel-framed, load-bearing members shall not be permitted.
Fluid in the supply side of a hydronic system shall not enter a tee fitting through the branch opening.
Piping shall be installed so that piping, connections and equipment shall not be subjected to excessive strains or stresses. Provisions shall be made to compensate for expansion, contraction, shrinkage and structural settlement.
Hangers and supports shall be of material of sufficient strength to support the piping, and shall be fabricated from materials compatible with the piping material. Piping shall be supported at intervals not exceeding the spacing specified in Table M2101.9.

TABLE M2101.9 HANGER SPACING INTERNALS


PIPING MATERIAL MAXIMUM HORIZONTAL SPACING (feet) MAXIMUM VERTICAL SPACING (feet)
ABS 4 10
CPVC ≤ 1 inch pipe or tubing 3 5
CPVC ≥ 11/4 inch 4 10
Copper or copper alloy pipe 12 10
Copper or copper alloy tubing 6 10
PE pipe or tubing 2.67 4
PEX tubing 2.67 4
PP<1 inch pipe or tubing 2.67 4
PP>11/4 inch 4 5
PVC 4 10
Steel pipe 12 15
Steel tubing 8 10


For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
Hydronic piping shall be tested hydrostatically at a pressure of not less than 100 pounds per square inch (psi) (690 kPa) for a duration of not less than 15 minutes.
Baseboard convectors shall be installed in accordance with the manufacturer’s installation instructions. Convectors shall be supported independently of the hydronic piping.
Piping for embedment in concrete or gysum materials shall be standard-weight steel pipe, copper tubing, cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) pressure pipe, chlorinated polyvinyl chloride (CPVC), cross-linked polyethylene (PEX) tubing or polypropylene (PP) with a minimum rating of 100 psi at 180°F (690 kPa at 82°C).
Piping joints that are embedded shall be installed in accordance with the following requirements:

1. Steel pipe joints shall be welded.
2. Copper tubing shall be joined with brazing material having a melting point exceeding 1,000°F (538°C).
3. CPVC tubing shall be joined using solvent cement joints.
4. Polypropylene pipe and tubing joints shall be installed with socket-type heat-fused polypropylene fittings.
5. Cross-linked polyethylene (PEX) tubing shall be joined using cold expansion, insert or compression fittings.
Piping or tubing to be embedded shall be tested by applying a hydrostatic pressure of not less than 100 psi (690 kPa). The pressure shall be maintained for 30 minutes, during which all joints shall be visually inspected for leaks.
Low temperature piping for embedment in concrete or gypsum materials shall be as indicated in Table M2101.1.
Piping joints (other than those in Section M2103.2) that are embedded shall comply with the following requirements:

1. Cross-linked polyethylene (PEX) tubing shall be installed in accordance with the manufacturer’s instructions.
2. Polyethylene tubing shall be installed with heat fusion joints.
3. Polypropylene (PP) tubing shall be installed in accordance with the manufacturer’s instructions.
Joints between polyethylene plastic pipe and tubing or fittings for ground source heat pump loop systems shall be heat fusion joints conforming to Section M2104.2.1.1, electrofusion joints conforming to Section M2104.2.1.2 or stab-type insertion joints conforming to Section M2104.2.1.3.
Joints shall be of the socket-fusion, saddle-fusion or butt-fusion type, fabricated in accordance with the piping manufacturer’s instructions. Joint surfaces shall be clean and free of moisture. Joint surfaces shall be heated to melt temperatures and joined. The joint shall be undisturbed until cool. Fittings shall be manufactured in accordance with ASTM D 2683.
Joint surfaces shall be clean and free of moisture, and scoured to expose virgin resin. Joint surfaces shall be heated to melt temperatures for the period of time specified by the manufacturer. The joint shall be undisturbed until cool. Fittings shall be manufactured in accordance with ASTM F 1055.
Joint surfaces shall be clean and free of moisture. Pipe ends shall be chamfered and inserted into the fitting to full depth. Fittings shall be manufactured in accordance with ASTM D 2513.
The assembled loop system shall be pressure tested with water at 100 psi (690 kPa) for 30 minutes with no observed leaks before connection (header) trenches are backfilled. Flow rates and pressure drops shall be compared to calculated values. If actual flow rate or pressure drop figures differ from calculated values by more than 10 percent, the problem shall be identified and corrected.
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