4101:8-21-01 Hydronic piping.

[Comment: When a reference is made within this rule to a federal statutory provision, an industry consensus standard, or any other technical publication, the specific date and title of the publication as well as the name and address of the promulgating agency are listed in rule 4101:8-44-01 of the Administrative Code. The application of the referenced standards shall be limited and as prescribed in section 102.5 of rule 4101:8-1-01 of the Administrative Code.]

SECTION 2101

HYDRONIC PIPING SYSTEMS INSTALLATION

2101.1 General. Hydronic piping shall conform to Table 2101.1. 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.

2101.2 System drain down. 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 the plumbing code.

Exception: The buried portions of systems embedded underground or under floors.

2101.3 Protection of potable water. The potable water system shall be protected from backflow in accordance with the provisions listed in the plumbing code.

2101.4 Pipe penetrations. Openings through concrete or masonry building elements shall be sleeved.

2101.5 Contact with building material. A hydronic piping system shall not be in direct contact with any building material that causes the piping material to degrade or corrode.

2101.6 Drilling and notching. Wood-framed structural members shall be drilled, notched or altered in accordance with the provisions of Sections 502.8, 602.6, 602.6.1 and 802.7. Holes in load bearing members of cold-formed steel light-frame construction shall be permitted only in accordance with Sections 505.2.5, 603.2.5 and 804.2.5. In accordance with the provisions of Sections 505.3.5, 603.3.4 and 804.3.4, cutting and notching of flanges and lips of load-bearing members of cold-formed steel light-frame construction shall not be permitted. Structural insulated panels (SIPs) shall be drilled and notched or altered in accordance with the provisions of Section 613.

2101.7 Prohibited tee applications. Fluid in the supply side of a hydronic system shall not enter a tee fitting through the branch opening.

2101.8 Expansion, contraction and settlement. 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.

2101.9 Piping support. 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 2101.9.

2101.10 Tests. 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.

SECTION 2102

BASEBOARD CONVECTORS

2102.1 General. Baseboard convectors shall be installed in accordance with the manufacturer's installation instructions. Convectors shall be supported independently of the hydronic piping.

SECTION 2103

FLOOR HEATING SYSTEMS

2103.1 Piping materials. Piping for embedment in concrete or gypsum 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), polybutylene, cross-linked polyethylene (PEX) tubing or polypropylene (PP) with a minimum rating of 100 psi at 180°F (690 kPa at 82°C).

2103.2 Thermal barrier required. Radiant floor heating systems shall have a thermal barrier in accordance with Sections 2103.2.1 through 2103.2.4.

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.

2103.2.1 Slab on grade installation. Radiant piping used in slab-on-grade applications shall have insulating materials having a minimum R-value of 5 installed beneath the piping.

2103.2.2 Suspended floor installation. In suspended floor applications, insulation shall be installed in the joist bay cavity serving the heating space above and shall consist of materials having a minimum R-value of 11.

2103.2.3 Thermal break required. A thermal break consisting of asphalt expansion joint materials or similar insulating materials shall be provided at a point where a heated slab meets a foundation wall or other conductive slab.

2103.2.4 Thermal barrier material marking. Insulating materials used in thermal barriers shall be installed so that the manufacturer's R-value mark is readily observable upon inspection.

2103.3 Piping joints. 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.

TABLE 2101.1

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 CAN/ CSA B 137.10 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    
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  
Polyethylene/aluminum/polyethylene (PE-AL-PE) pressure pipe 1, 2, 3 ASTM F 1282 CSA B 137.9 Mechanical, crimp/insert  
Polyproplylene (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 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, 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: ºC = [(ºF)-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 44.

2103.4 Testing. 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.

SECTION 2104

LOW TEMPERATURE PIPING

2104.1 Piping materials. Low temperature piping for embedment in concrete or gypsum materials shall be as indicated in Table 2101.1.

2104.2 Piping joints. Piping joints (other than those in Section 2103.2 ) 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.

2104.2.1 Polyethylene plastic pipe and tubing for ground source heat pump loop systems. Joints between polyethylene plastic pipe and tubing or fittings for ground source heat pump loop systems shall be heat fusion joints conforming to Section 2104.2.1.1, electrofusion joints conforming to Section 2104.2.1.2 or stab-type insertion joints conforming to Section 2104.2.1.3.

2104.2.1.1 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.

2104.2.1.2 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.

2104.2.1.3 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.

2104.3 Raised temperature polyethylene (PE-RT) plastic tubing. Joints between raised temperature polyethylene tubing and fittings shall conform to Sections 2104.3.1 and 2104.3.2. Mechanical joints shall be installed in accordance with the manufacturer's instructions.

2104.3.1 Compression-type fittings. Where compression type fittings include inserts and ferrules or O-rings, the fittings shall be installed without omitting such inserts and ferrules or O-rings.

2104.3.2 PE-RT-to-metal connections. Solder joints in a metal pipe shall not occur within 18 inches (457 mm) of a transition from such metal pipe to PERT pipe.

TABLE 2101.9

HANGER SPACING INTERVALS

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
PB pipe or tubing 2.67 4
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 10
PVC 4 10
Steel pipe 12 15
Steel tubing 8 10

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

2104.4 Polyethylene/Aluminum/Polyethylene (PE-AL-PE) pressure pipe. Joints between polyethylene/aluminum/polyethylene pressure pipe and fittings shall conform to Sections 2104.4.1 and 2104.4.2. Mechanical joints shall be installed in accordance with the manufacturer's instructions.

2104.4.1 Compression-type fittings. Where compression type fittings include inserts and ferrules or O-rings, the fittings shall be installed without omitting such inserts and ferrules or O-rings.

2104.4.2 PE-AL-PE to metal connections. Solder joints in a metal pipe shall not occur within 18 inches (457 mm) of a transition from such metal pipe to PE-AL-PE pipe.

SECTION 2105

GROUND SOURCE HEAT PUMP SYSTEM LOOP PIPING

2105.1 Testing. 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.

Effective: 01/01/2013
R.C. 119.032 review dates: 01/01/2018
Promulgated Under: 119.03
Statutory Authority: 3781.10(A) , 4104.43(A)(1)
Rule Amplifies: 3781.01 , 3781.06 , 3781.10 , 3781.11 , 3791.04 , 4740.14