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Chapter 12 — HYDRONICS

1211.2 Chlorinated Polyvinyl Chloride (CPVC) Pipe.

California Mechanical Code (Title 24, Part 4) · 2019 edition · updated 2026-09-10 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

Joints between chlorinated polyvinyl chloride (CPVC) pipe or fittings shall be installed in accordance with one of the following methods:

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2019 CALIFORNIA MECHANICAL CODE 239

HYDRONICS any other purpose or distributed to any other persons or parti es.

TABLE 1210.1 MATERIALS FOR HYDRONIC SYSTEM PIPING, TUBING, AND FITTINGS

MATERIAL STANDARDS
MATERIAL
 PIPING/TUBING
 FITTINGS
Copper/Copper Alloy
 ASTM B42, ASTM B43, ASTM B75,
ASTM B88, ASTM B135, ASTM B2512,
ASTM B302, ASTM B447
 ASME B16.15, ASME B16.18, ASME B16.22,
ASME B16.23, ASME B16.24, ASME B16.26,
ASME B16.29, ASME B16.51, ASSE 1061
Ductile Iron
AWWA C115/A21.15,
AWWA C151/A21.51
~~AWWA C110/A21.101, ~~
AWWA C153/A21.53
Steel
ASTM A53, ASTM A106, ASTM A254
ASME B16.5, ASME B16.9,
ASME B16.11, ASTM A420
Gray Iron
 ––
ASTM A126

Malleable Iron
 ––
ASME B16.3

Chlorinated Polyvinyl Chloride (CPVC)
 ASTM D2846, ASTM F441,
ASTM F442, CSA B137.6
ASSE 1061, ASTM D2846, ASTM F437,
ASTM F438, ASTM F439, ASTM F1970,
CSA B137.6
Polyethylene (PE)
 ASTM D1693, ASTM D2513,
ASTM D2683, ASTM D2737,
ASTM D3035, ASTM D3350,
ASTM F714, AWWA C901,
CSA B137.1, NSF 358-1
ASTM D2609, ASTM D2683, ASTM D3261,
ASTM F1055, CSA B137.1, NSF 358-1
Cross-Linked Polyethylene (PEX)
ASTM F876, CSA B137.5, NSF 358-3
 ASSE 1061, ASTM F877, ASTM F1807,
ASTM F1960, ASTM F1961, ASTM F2080,
ASTM F2098, ASTM F2159, ASTM F2735,
CSA B137.5, NSF 358-3
Polypropylene (PP)
 ASTM F2389, NSF 358-2
ASTM F2389, NSF 358-2

Polyvinyl Chloride (PVC)
ASTM D1785, ASTM D2241,
CSA B137.3
ASTM D2464, ASTM D2466,
ASTM D2467, ASTM F1970,
CSA B137.2, CSA B137.3
Raised Temperature Polyethylene (PE-RT)
 ASTM F2623, ASTM F2769,
CSA B137.18
ASSE 1061, ASTM F1807, ASTM F2159,
ASTM F2735, ASTM F2769, ASTM D3261,
ASTM F1055, CSA B137.18
Cross-Linked Polyethylene/
Aluminum/Cross-Linked Polyethylene
(PEX-AL-PEX)
 ASTM F1281, ASTM F2262,
CSA B137.10
ASTM F1281, ASTM F1974, ASTM F2434,
CSA B137.10
Polyethylene/Aluminum/Polyethylene (PE-
AL-PE)
 ASTM F1282, CSA B137.9 ASTM F1282, ASTM F1974, CSA B137.9
Chlorinated Polyvinyl Chloride/Alu-
minum/ Chlorinated Polyvinyl Chloride
(CPVC/AL/CPVC)

 ASTM F2855 ASTM D2846

2 Only type K, L, or M tubing allowed to be installed.

(1) Mechanical joints shall include flanged, grooved, and push

fit fittings. Removable and non-removable push fit fittings

(1) Mechanical joints shall include flanged, grooved, and push

fit fittings. Removable and non-removable push fit fittings with an elastomeric o-ring that employ quick assembly push fit connectors shall be in accordance with ASSE 1061. (2) Solvent cement joints for CPVC pipe and fittings shall be

clean from dirt and moisture. Solvent cements in accor

Solvent cement joints for CPVC pipe and fittings shall be

clean from dirt and moisture. Solvent cements in accordance with ASTM F493, requiring the use of a primer shall be orange in color. The primer shall be colored and be in accordance with ASTM F656. Listed solvent cement in accordance with ASTM F493 that does not require the use of primers, yellow or red in color, shall be permitted for pipe and fittings manufactured in accor

dance with ASTM D2846, 1 / 2 of an inch (15 mm) through 2 inches (50 mm) in diameter or ASTM F442, 1 / 2 of an inch (15 mm) through 3 inches (80 mm) in diameter. Apply primer where required inside the fitting and to the depth of the fitting on pipe. Apply liberal coat of cement to the outside surface of pipe to depth of fitting and inside of fitting. Place pipe inside fitting to forcefully bottom the pipe in the socket and hold together until joint is set. (3) Threaded joints for CPVC pipe shall be made with pipe

threads in accordance with ASME B1.20.1. A minimum of Schedule 80 shall be permitted to be threaded, and the pressure rating shall be reduced by 50 percent. The use of

240 2019 CALIFORNIA MECHANICAL CODE

HYDRONICS

molded fittings shall not result in a 50 percent reduction in the pressure rating of the pipe provided that the molded fittings shall be fabricated so that the wall thickness of the material is maintained at the threads. Thread sealant compound that is compatible with the pipe and fitting, insoluble in water, and nontoxic shall be applied to male threads. Caution shall be used during assembly to prevent over tightening of the CPVC components once the thread sealant has been applied. Female CPVC threaded fittings shall be used with plastic male threads only.

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▸Contents — California Mechanical Code (Title 24, Part 4)
California Mechanical Code (Title 24, Part 4)
  1. Chapter 1 — GENERAL CODE PROVISIONS
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. Chapter 4 — VENTILATION AIR
  5. Chapter 5 — EXHAUST SYSTEMS
  6. Chapter 6 — DUCT SYSTEMS
  7. Chapter 7 — COMBUSTION AIR
  8. Chapter 8 — CHIMNEYS AND VENTS
  9. Chapter 9 — INSTALLATION OF SPECIFIC APPLIANCES
  10. Chapter 10 — BOILERS AND PRESSURE VESSELS
  11. Chapter 11 — REFRIGERATION
  12. ▸Chapter 12 — HYDRONICS
    Overview
    1. 1204.2 Color and Information. Each system shall be identified …
    2. 1204.3 Potable Water. Potable water systems shall be identifie…
    3. 1204.4 Nonpotable Water. Nonpotable water systems
    4. 1203.1 Heat Source.1203.0 Capacity of Heat Source. The heat so…
    5. 1203.2 Dual Purpose Water Heater. Water heaters utilized for c…
    6. 1201.1 Applicability.1201.0 General. This chapter shall apply …
    7. 1201.2 Insulation. Surfaces within reach of building occupants…
    8. 1201.3 Water Hammer. The piping system shall be
    9. 1201.4 Terminal Units. Terminal units, valves, and flow
    10. 1201.5 Return-Water Low-Temperature Protection.
    11. 1202.1 Prohibited Sources.1202.0 Protection of Potable Water S…
    12. 1202.2 Chemical Injection. Where systems include an
    13. 1202.3 Compatibility. Fluids used in hydronic systems
    14. 1203.3 Tankless Water Heater. Tankless water heaters
    15. 1206.2 Discharge Piping. The discharge piping serving a
    16. 1204.5 Location of Piping Identification. The background color…
    17. 1204.6 Flow Directions. Flow directions shall be indicated
    18. 1205.1 Operating Instructions.1205.0 Installation, Testing, an…
    19. 1205.2 Pressure Testing. System piping and components
    20. 1205.3 Flushing. Heating and cooling sources, system piping an…
    21. 1206.1 General.1206.0 Pressure and Safety Devices. Each closed…
    22. 1207.1 General.1207.0 Heating Appliances and Equipment. Heatin…
    23. 1207.2 Boilers. Boilers and their control systems shall comply…
    24. 1207.3 Dual-Purpose Water Heaters. Water heaters used
    25. 1207.4 Solar Heat Collector Systems. Solar water heating syste…
    26. 1208.2 Mounting. The circulator or pump shall be installed
    27. 1208.3 Sizing. The selection and sizing of a circulator or
    28. 1209.2 Installation. Expansion tanks shall be accessible for
    29. 1209.3 Open-Type Expansion Tanks. Open type expansion tanks sh…
    30. 1209.4 Closed-Type Tanks. Closed-type expansion tanks
    31. 1209.5 Sizing. Expansion tanks shall be sized to accept the
    32. 1210.1 Piping, Tubing, and Fittings.1210.0 Materials. Hydronic…
    33. 1210.2 Expansion and Contraction. Pipe and tubing shall
    34. 1210.3 Hangers and Supports. Pipe and tubing shall be
    35. 1210.4 Oxygen Diffusion Corrosion. PEX and PE-RT tubing in clo…
    36. 1211.1 General.1211.0 Joints and Connections. Joints and conne…
    37. 1211.2 Chlorinated Polyvinyl Chloride (CPVC) Pipe.
    38. 1211.3 CPVC/AL/CPVC Plastic Pipe and Joints. Joints
    39. 1211.4 Copper or Copper Alloy Pipe and Tubing.
    40. 1211.5 Cross-Linked Polyethylene (PEX) Pipe. Joints
    41. 1211.8 Polyethylene (PE) Plastic Pipe/Tubing. Joints
    42. 1211.6 Cross-Linked Polyethylene/Aluminum/Cross-
    43. 1211.7 Ductile Iron Pipe. Joints between ductile iron pipe
    44. 1211.9 Polyethylene/Aluminum/Polyethylene (PE-AL-
    45. 1211.10 Polyethylene of Raised Temperature (PE-RT).
    46. 1211.11 Polypropylene (PP) Pipe. Joints between
    47. 1211.12 Polyvinyl Chloride (PVC) Pipe. Joints between
    48. 1211.13 Steel Pipe and Tubing. Joints between steel pipe,
    49. 1211.14 Joints Between Various Materials. Joints
    50. 1212.1 General. 1212.0 Valves. Valves shall be rated for the o…
    51. 1212.2 Where Required. Valves shall be installed in
    52. 1212.3 Heat Exchanger. Isolation valves shall be installed
    53. 1212.4 Pressure Vessels. Isolation valves shall be
    54. 1212.5 Pressure Reducing Valves. Isolation valves shall
    55. 1214.3 Flow-Sensing Devices. A direct-fired heat source,
    56. 1214.4 Automatic Makeup Fluid. Where an automatic
    57. 1214.5 Differential Pressure Regulation. Provisions
    58. 1214.6 Air-Removal Device. Provision shall be made for
    59. 1214.7 Air-Separation Device. To assist with the removal
    60. 1214.8 Secondary Loops. Secondary loops that are isolated from…
    61. 1215.1 General.1215.0 Hydronic Space Heating. Based on the sys…
    62. 1215.2 Installation. Heat-distribution units shall be
    63. 1212.6 Equipment, Components, and Appliances.
    64. 1212.7 Expansion Tank. Isolation valves shall be installed
    65. 1212.8 Flow Balancing Valves. Where flow balancing
    66. 1212.9 Mixing or Temperature Control Valves. Where
    67. 1212.10 Thermosiphoning. An approved type check valve
    68. 1212.11 Air Removal Device or Air Vents. Isolation
    69. 1213.1 Water Temperature Controls.1213.0 System Controls. A he…
    70. 1213.2 Operating Steam Controls. A steam heat source
    71. 1213.3 Occupied Spaces. A temperature-sensing device
    72. 1214.2 Low-Water Control. Direct-fired heat sources
    73. 1215.3 Freeze Protection. Hydronic systems and components shal…
    74. 1215.4 Balancing. System loops shall be installed so that
    75. 1215.5 Heat Transfer Fluid. The ignitable flash point of
    76. 1216.1 Steam Traps.1216.0 Steam Systems. For other than one-pi…
    77. 1216.2 Sloping for Two-Pipe System. Two-pipe steam
    78. 1216.3 Sloping for One-Pipe System. One-pipe steam
    79. 1216.4 Automatic Air Vents. Steam automatic air vents
    80. 1216.5 Condensate Flow. System piping shall be installed
    81. 1216.6 Steam-Distribution Piping. Where multi-row elements are…
    82. 1217.3 Radiant Cooling Systems. Radiant cooling systems shall …
    83. 1217.4 Tube Placement. Hydronic radiant system tubing
    84. 1217.1 Installation.1217.0 Radiant Heating and Cooling. Radian…
    85. 1217.2 Radiant Under-Floor Heating. Floor finished surface tem…
    86. 1217.5 Poured Floor Structural Concrete Slab Sys-tems (Thermal…
    87. 1218.0 Heat Exchangers. 1218.1 General. Systems utilizing heat…
    88. 1217.6 Radiant Heating and Cooling Panels. Radiant
    89. 1219.1 General.Tanks. Domestic hot-water heat exchangers,
    90. 1220.1 Use of Chemical Additives and Corrosive Flu-
    91. 1220.2 Snow and Ice Melt Controls. An automatic thermostatical…
    92. 1220.3 Hydronic Makeup Air Units. Hydronic makeup
    93. 1221.1 General.1221.0 Piping Installation. Piping, fittings, a…
    94. 1221.2 Embedded Piping Materials and Joints. Piping embedded i…
    95. 1221.3 Pressure Testing. Piping to be embedded in concrete sha…
    96. 1221.4 System Drainage. Hydronic piping systems shall
    97. 1221.5 Condensate Drainage. Condensate drains from
    98. 1221.6 Clearance to Combustibles. Hydronic piping
  13. Chapter 13 — FUEL GAS PIPING
  14. Chapter 14 — PROCESS PIPING
  15. Chapter 15 — SOLAR ENERGY SYSTEMS
  16. Chapter 16 — STATIONARY POWER PLANTS
  17. Chapter 17 — REFERENCED STANDARDS
  18. Appendix A — RESIDENTIAL PLAN EXAMINER REVIEW FORM FOR HVAC SY…
  19. Appendix B — PROCEDURES TO BE FOLLOWED TO PLACE GAS EQUIPMENT …
  20. Appendix C — INSTALLATION AND TESTING OF OIL (LIQUID) FUEL-FIR…
  21. Appendix D — FUEL SUPPLY: MANUFACTURED/MOBILE HOME PARKS AND R…
  22. Appendix E — SUSTAINABLE PRACTICES
  23. Appendix F — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
  24. Appendix G — EXAMPLE CALCULATION OF OUTDOOR AIR RATE

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