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 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, |
|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,
|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.|
|1, 2||ASTM F 1281 or CAN/ CSA B137.10||Mechanical, crimp/insert||Install in accordance with manufacturer’s instructions.|
|PEX fittings||ASTM F 877 ASTM F 1807 ASTM F 1960 ASTM F 2098 ASTM F 2159 ASTM F 2735||Copper-crimp/insert fittings, cold expansion fittings, stainless steel clamp, insert fittings||Install in accordance with manufacturer’s instructions|
|Polybutylene (PB) pipe and tubing||1, 2, 3||ASTM D 3309||Heat-fusion, crimp/insert and compression||Joints in concrete shall be heat-fused.|
|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|
(PE-AL-PE) pressure pipe
|1, 2, 3||ASTM F 1282 CSA B 137.9||Mechanical, crimp/insert|
|Polypropylene (PP)||1, 2, 3||ISO 15874 |
ASTM F 2389
|Heat-fusion joints, mechanical fittings, threaded adapters, compression joints|
|Raised temperature polyethylene (PE-RT)||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 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|
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.
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
|PIPING MATERIAL||MAXIMUM |
|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|
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. Polybutylene pipe and tubing joints shall be installed with socket-type heat-fused polybutylene fittings.
4. CPVC tubing shall be joined using solvent cement joints.
5. Polypropylene pipe and tubing joints shall be installed with socket-type heat-fused polypropylene fittings.
6. 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:
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 M2188.8.131.52, electrofusion joints conforming to Section M2184.108.40.206 or stab-type insertion joints conforming to Section M2220.127.116.11.M218.104.22.168 Heat-fusion joints.
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. M222.214.171.124 Electrofusion joints.
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. M2126.96.36.199 Stab-type insert fittings.
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.