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.
HYDRONIC PIPING MATERIALS
|Brass pipe||1||ASTM B 43||Brazed, welded, threaded, mechanical and|
|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, |
|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|
|Joints embedded in |
|Cross-linked polyethylene (PEX)||1, 2, 3||ASTM F 876, F 877||(See PEX fittings)||Install in accordance with|
|1, 2||ASTM F 1281 or |
CAN/ CSA B137.10
|Mechanical, crimp/insert||Install in accordance with|
|PEX fittings||ASTM F 877|
ASTM F 1807ASTM F 1960
ASTM F 2098ASTM F 2159
ASTM F 2735
|Copper-crimp/insert fittings, cold expansion|
fittings, stainless steel clamp, insertfittings
|Install in accordance with|
|Polybutylene (PB) pipe and tubing||1, 2, 3||ASTM D 3309||Heat-fusion, crimp/insert and compression||Joints in concrete shall be |
|Polyethylene (PE) pipe, tubing and|
fittings (for ground source heatpump loop systems)
|1, 2, 4||ASTM D 2513|
ASTM D 3350ASTM D 2513
ASTM D 3035ASTM D 2447
ASTM D 2683ASTM F 1055
ASTM D 2837ASTM D 3350
ASTM D 1693
(PE-AL-PE) pressure pipe
|1, 2, 3||ASTM F 1282|
CSA B 137.9
|Polypropylene (PP)||1, 2, 3||ISO 15874|
ASTM F 2389
|Heat-fusion joints, mechanical fittings,|
threaded adapters, compression joints
|Raised temperature polyethylene|
|1, 2, 3||ASTM F 2623|
ASTM F 2769
|Copper crimp/insert fitting stainless steel|
clamp, insert fittings
|Soldering fluxes||1||ASTM B 813||Copper tube joints|
|Steel pipe||1, 2||ASTM A 53, |
|Brazed, welded, threaded, flanged and|
|Joints in concrete shall be|
welded. Galvanized pipeshall not be welded or
|Steel tubing||1||ASTM A 254||Mechanical fittings, welded|
For SI: °C = [(°F)-32]/1.8.
- Above ground.
- Embedded in radiant systems.
- Temperatures below 180°F only.
- Low temperature (below 130°F) applications only.
- Standards as listed in Chapter 44.
Hydronic piping systems shall be installed to permit draining of the system. Where the system drains to the plumbing drainage system, the installation shall conform to the requirements of Chapters 25 through 32 of this code.
Exception: The buried portions of systems embedded underground or under floors.
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.
HANGER SPACING INTERVALS
|CPVC ≤ 1-inch pipe or tubing||3||5|
|CPVC ≥ 11/4 inches||4||10|
|Copper or copper alloy pipe||12||10|
|Copper or copper alloy tubing||6||10|
|PB pipe or tubing||2.67||4|
|PE pipe or tubing||2.67||4|
|PP < 1-inch pipe or tubing||2.67||4|
|PP > 11/4 inches||4||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 (690 kPa) for a duration of not less than 15 minutes.
Radiant floor heating systems shall have a thermal barrier in accordance with Sections M2103.2.1 through M2103.2.4.
Exception: Insulation shall not be required in engineered systems where it can be demonstrated that the insulation will decrease the efficiency or have a negative effect on the installation.
Piping joints that are embedded shall be installed in accordance with the following requirements:
- Steel pipe joints shall be welded.
- Copper tubing shall be joined with brazing material having a melting point exceeding 1,000°F (538°C).
- Polybutylene pipe and tubing joints shall be installed with socket-type heat-fused polybutylene fittings.
- CPVC tubing shall be joined using solvent cement joints.
- Polypropylene pipe and tubing joints shall be installed with socket-type heat-fused polypropylene fittings.
- Cross-linked polyethylene (PEX) tubing shall be joined using cold expansion, insert or compression fittings.
Piping joints, other than those in Section M2103.3, that are embedded shall comply with the following requirements:
- Cross-linked polyethylene (PEX) tubing shall be installed in accordance with the manufacturer’s instructions.
- Polyethylene tubing shall be installed with heat fusion joints.
- Polypropylene (PP) tubing shall be installed in accordance with the manufacturer’s instructions.