Piping Materials, Joints & Supports

Grounded in the retrieved California Mechanical Code — click a citation to read the verbatim passage:

• CMC § 1210.0 High relevance — show source text

  1210.0 Materials . . . . . . . . . . . . . . . . . . . . 260

  1210.1 Piping, Tubing, and Fittings . . . . . 260

  1210.2 Expansion and Contraction . . . . . . 260

  1210.3 Hangers and Supports . . . . . . . . . 260

  1210.4 Oxygen Diffusion Corrosion . . . . . 260

  1211.0 Joints and Connections . . . . . . . . 260

  1211.1 General. . . . . . . . . . . . . . . . . . . . . 260

  1211.2 Pipe Bends . . . . . . . . . . . . . . . . . . 260

  Table 1210.1 Materials for Hydronic System Piping, Tubing, and Fittings . . . . . 261

  Table 1211.2.2 Minimum Bend Radius

  for PE Pipe Installed in Open Cut Trench . . . . . . . . . . . . . 262

  1211.3 Chlorinated Polyvinyl Chloride (CPVC) Pipe . . . . . . . . . . . . . . . . . 262

  1211.4 CPVC/AL/CPVC Plastic Pipe and Joints . . . . . . . . . . . . . . . . . . . 262

  2025 CALIFORNIA MECHANICAL CODE

  1211.5 Copper or Copper Alloy Pipe and Tubing . . . . . . . . . . . . . . . . . . 262

  1211.6 Crossed-Linked Polyethylene (PEX) Pipe . . . . . . . . . . . . . . . . . . 263

  1211.7 Cross-Linked Polyethylene/ Aluminum/Cross-Linked

  Polyethylene (PEX-AL-PEX) Pipe. . 263

  1211.8 Ductile Iron Pipe . . . . . . . . . . . . . . 263

  1211.9 Polyethylene (PE) Plastic Pipe/Tubing. . . . . . . . . . . . 263

  1211.10 Polyethylene/Aluminum/ Polyethylene (PE-AL-PE) . . . . . . . 264

  1211.11 Polyethylene of Raised Temperature (PE-RT). . . . . . . . . . 264

  1211.12 Polypropylene (PP) Pipe. . . . . . . . 264

  1211.13 Polyvinyl Chloride (PVC) Pipe . . . 264

  1211.14 Steel Pipe and Tubing . . . . . . . . . 265

  1211.15 Stainless Steel Pipe and Joints. . . 265

  1211.16 Joints Between Various Materials. . 265

  1212.0 Valves. . . . . . . . . . . . . . . . . . . . . . 265

  1212.1 General. . . . . . . . . . . . . . . . . . . . . 265

  1212.2 Where Required . . . . . . . . . . . . . . 265

  1212.3 Heat Exchanger . . . . . . . . . . . . . . 265

  1212.4 Pressure Vessels . . . . . . . . . . . . . 265

  1212.5 Pressure Reducing Valves . . . . . . 265

• CMC § 3.14 High relevance — show source text

  Where the proper melt is obtained, the pipe and fitting shall be joined by inserting one into the other with applied force. The joint shall fuse together and remain undisturbed until cool.

  (4) Mechanical joints between PE pipe or tubing and fittings shall include insert and mechanical compression fittings that provide a pressure seal resistance to pullout. Joints for insert fittings shall be made by cutting the pipe square, using a cutter designed for plastic piping, and removal of sharp edges. Two stainless steel clamps shall be placed over the end of the pipe. Fittings shall be checked for proper size based on the diameter of the pipe. The end of pipe shall be placed over the barbed insert fitting, making contact with the fitting shoulder. Clamps shall be positioned equal to 180 degrees (3.14 rad) apart and shall be tightened to provide a leak tight joint. Compression type couplings and fittings shall be permitted for use in joining PE piping and tubing. Stiffeners that extend beyond the clamp or nut shall be prohibited. Bends shall be not less than 30 pipe diameters, or the coil radius where bending with the coil. Bends shall not be permitted closer than 10 pipe diameters of a fitting or valve. Mechanical joints shall be designed for their intended use. 1211.10 Polyethylene/Aluminum/Polyethylene (PE- AL-PE). Joints between polyethylene/aluminum/polyethylene (PE-AL-PE) pipe and fittings shall be installed in accordance with one of the following methods: (1) Mechanical joints for PE-AL-PE pipe or tubing and fittings shall be either of the metal insert fittings with a split ring and compression nut or metal insert fittings with copper crimp rings. Metal insert fittings shall comply with ASTM F1974. Crimp insert fittings shall be joined to the pipe by placing the copper crimp ring around the outer circumference of the pipe, forcing the pipe material into the space formed by the ribs on the fitting until the pipe contacts the shoulder of the fitting. The crimp ring shall then be positioned on the pipe so the edge of the crimp ring is [1] / 8 of an inch (3.2 mm) to [1] / 4 of an inch (6.4 mm) from the end of the pipe. The jaws of the crimping tool shall be centered over the crimp ring and tool perpendicular to the barb. The jaws shall be closed around the crimp ring and shall not be crimped more than once. (2) Compression joints for PE-AL-PE pipe or tubing and fittings shall be joined through the compression of a split ring, by a compression nut around the circumference of

  264 2025 CALIFORNIA MECHANICAL CODE

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  HYDRONICS

  shall be a soldered, brazed, flared, or pressed joint and the connection between the threaded pipe and the fitting shall be made with a standard pipe size threaded joint.

  1211.16.2 Plastic Pipe to Other Materials. Where connecting plastic pipe to other types of plastic or other types of piping material; approved listed adapter or transition fittings and listed for the specific transition intended shall be used. Except as provided in the plumbing code, PVC pipe and fittings shall not be solvent welded to any other unlike material.

  1212.0 Valves.

• CMC § 1208.0 High relevance — show source text

  1208.0 Circulators and Pumps. 1208.1 General. Circulators and pumps shall be selected for their intended use based on the heat transfer fluid, intended operating temperature range and pressure. Circulators and pumps shall be installed to allow for service and maintenance. The manufacturer’s installation instructions shall be followed for correct orientation and installation. Motor operated pumps rated 600V or less shall comply with CSA C22.2 No. 108 or UL 778.

  2025 CALIFORNIA MECHANICAL CODE 259

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  HYDRONICS

  temperature and pressure of the system and shall be compatible with the type of heat transfer fluid. Pipe fittings and valves shall be approved for the specific installation with the piping, materials to be installed and shall comply with the applicable standards referenced in Table 1210.1. Where required, exterior piping shall be protected against freezing, UV radiation, corrosion and degradation. Embedded pipe or tubing shall comply with Section 1221.2. 1210.2 Expansion and Contraction. Pipe and tubing shall be so installed that it will not be subject to undue strains or stresses, and provisions shall be made for expansion, contraction, and structural settlement. [OSHPD 1, 1R, 2, 4 & 5] Pipe connections less than 2½ inches (64 mm) to heating coils, cool- ing coils, humidifiers, and similar equipment shall have flexible connectors or three (3) 90-degree offsets in close proximity of the connection.

  1210.3 Hangers and Supports. Pipe and tubing shall be supported in accordance with Section 313.0. Equipment that is part of the piping system shall be provided with additional support in accordance with this code and manufacturer’s installation instructions. Radiant systems utilizing heat emission or transfer plates shall have a gap of at least ¼ inch (6.4 mm) between adjacent plates. 1210.4 Oxygen Diffusion Corrosion. PEX and PE-RT tubing in closed hydronic systems shall contain an oxygen barrier. 1210.4.1 Vented Closed-Loop Systems. All components installed in a vented closed-loop system shall be constructed of non-ferrous or other corrosion resistant

  materials.

  1210.4.2 Non-Oxygen Barrier Closed-Loop Sys- tems. All components installed in a non-oxygen barrier system shall be constructed of non-ferrous or other corrosion resistant materials.

  1211.0 Joints and Connections.

  1211.1 General. Joints and connections shall be of an approved type. Joints shall be gas and watertight and designed for the pressure of the hydronic system. Changes in direction shall be made by the use of fittings or with pipe bends. Joints between pipe and fittings shall be installed in accordance with the manufacturer’s installation instructions. Joints used underground shall be of an approved type for buried applications in accordance with Section 1221.2.3.

  1211.2 Pipe Bends. Pipe bends shall be formed in accordance with Section 1211.2.1 for PEX or Section 1211.2.2 for

  PE.

• CMC § 1206.2 High relevance — show source text

  1206.2 Discharge Piping . . . . . . . . . . . . . 259

  1207.0 Heating Appliances and Equipment . . . . . . . . . . . . . . . . . . 259

  1207.1 General. . . . . . . . . . . . . . . . . . . . . 259

  1207.2 Boilers. . . . . . . . . . . . . . . . . . . . . . 259

  1207.3 Dual Purpose Water Heaters . . . . 259

  1207.4 Solar Heat Collector Systems. . . . 259

  1207.5 Heat Pumps . . . . . . . . . . . . . . . . . 259

  1208.0 Circulators and Pumps . . . . . . . . . 259

  1208.1 General. . . . . . . . . . . . . . . . . . . . . 259

  1208.2 Mounting. . . . . . . . . . . . . . . . . . . . 260

  1208.3 Sizing . . . . . . . . . . . . . . . . . . . . . . 260

  1209.0 Expansion Tanks . . . . . . . . . . . . . 260

  1209.1 General. . . . . . . . . . . . . . . . . . . . . 260

  1209.2 Installation . . . . . . . . . . . . . . . . . . 260

  1209.3 Closed-Type Tanks . . . . . . . . . . . 260

  1209.4 Sizing . . . . . . . . . . . . . . . . . . . . . . 260

  1210.0 Materials . . . . . . . . . . . . . . . . . . . . 260

  1210.1 Piping, Tubing, and Fittings . . . . . 260

  1210.2 Expansion and Contraction . . . . . . 260

  1210.3 Hangers and Supports . . . . . . . . . 260

  1210.4 Oxygen Diffusion Corrosion . . . . . 260

  1211.0 Joints and Connections . . . . . . . . 260

  1211.1 General. . . . . . . . . . . . . . . . . . . . . 260

  1211.2 Pipe Bends . . . . . . . . . . . . . . . . . . 260

  Table 1210.1 Materials for Hydronic System Piping, Tubing, and Fittings . . . . . 261

  Table 1211.2.2 Minimum Bend Radius

  for PE Pipe Installed in Open Cut Trench . . . . . . . . . . . . . 262

  1211.3 Chlorinated Polyvinyl Chloride (CPVC) Pipe . . . . . . . . . . . . . . . . . 262

  1211.4 CPVC/AL/CPVC Plastic Pipe and Joints . . . . . . . . . . . . . . . . . . . 262

  2025 CALIFORNIA MECHANICAL CODE

  1211.5 Copper or Copper Alloy Pipe and Tubing . . . . . . . . . . . . . . . . . . 262

• CMC § 605.6.2 Medium relevance — show source text

  605.6.2 Mechanical Joints. Mechanical joints between PE pipe or tubing and fittings shall include insert and mechanical compression fittings that provide a pressure seal resistance to pullout. Joints for insert fittings shall be made by cutting the pipe square, using a cutter designed for plastic piping, and removal of sharp edges. Two stainless steel clamps shall be placed over the end of the pipe. Fittings shall be checked for proper size based on the diameter of the pipe. The end of pipe shall be placed over the barbed insert fitting, making contact with the fitting shoulder. Clamps shall be positioned equal to 180 degrees (3.14 rad) apart and shall be tightened to provide a leak tight joint. Compression type couplings and fittings shall be permitted for use in joining PE piping and tubing. Stiffeners that extend beyond the

  clamp or nut shall be prohibited. Bends shall be not less than 30 pipe diameters, or the coil radius where bending with the coil. Bends shall not be permitted closer than 10 pipe diameters of a fitting or valve. Mechanical joints shall be designed for their intended use. 605.7 PE-AL-PE Plastic Pipe/Tubing and Joints. PEAL-PE plastic pipe or tubing and fitting joining methods shall be installed in accordance with the manufacturer’s installation instructions and shall comply with Section 605.7.1 and Section 605.7.1.1.

  605.7.1 Mechanical Joints. Mechanical joints for PEAL-PE pipe or tubing and fittings shall be either of the metal insert fittings with a split ring and compression nut or metal insert fittings with copper crimp rings. Metal insert fittings shall comply with ASTM F1974. Crimp insert fittings shall be joined to the pipe by placing the copper crimp ring around the outer circumference of the pipe, forcing the pipe material into the space formed by the ribs on the fitting until the pipe contacts the shoulder of the fitting. The crimp ring shall then be positioned on the pipe so the edge of the crimp ring is [1] ⁄ 8 of an inch (3.2 mm) to [1] ⁄ 4 of an inch (6.4 mm) from the end of the pipe. The jaws of the crimping tool shall be centered over the crimp ring and tool perpendicular to the barb. The jaws shall be closed around the crimp ring and shall not be crimped more than once. 605.7.1.1 Compression Joints. Compression joints for PE-AL-PE pipe or tubing and fittings shall be joined through the compression of a split ring, by a compression nut around the circumference of the pipe. The compression nut and split ring shall be placed around the pipe. The ribbed end of the fitting shall be inserted into the pipe until the pipe contacts the shoulder of the fitting. Position and compress the split ring by tightening the compression nut onto the insert fitting. 605.8 PE-RT. Polyethylene of raised temperature (PE-RT) tubing and fitting joining methods and shall comply with Section 605.8.1.

  605.8.1 Mechanical Joints. Fittings for PE-RT tubing shall comply with the applicable standards listed in Table 604.1. Mechanical joints for PE-RT tubing shall be installed in accordance with the manufacturer’s instal lation instructions.

• CMC § 1210.3.4 Medium relevance — show source text

  Exception: Appliance or equipment shutoff valves required by this code shall be permitted to be installed in accessible spaces containing vented appliances. 1210.3.4 Prohibited Locations. Gas piping inside any building shall not be installed in or through a clothes chute, chimney or gas vent, dumbwaiter, elevator shaft, or air duct, other than combustion air ducts. [NFPA 54:7.2.5]

  Exception: Ducts used to provide ventilation air in accordance with Section 506.0 or to above-ceiling spaces in accordance with Section 1210.3.3.1.

  1210.3.5 Hangers, Supports, and Anchors. Piping shall be supported with metal pipe hooks, metal pipe straps, metal bands, metal brackets, metal hangers, or building structural components, suitable for the size of piping, of adequate strength and quality, and located at intervals so as to prevent or damp out excessive vibration. Piping shall be anchored to prevent undue strains on connected appliances and equipment and shall not be supported by other piping. Pipe hangers and supports shall conform to the requirements of MSS SP-58. [NFPA 54:7.2.6.1] 1210.3.5.1 Spacing. Spacing of supports in gas piping installations shall not be greater than shown in Table 1210.3.5.1. Spacing of supports of CSST shall be in accordance with the CSST manufacturer’s instructions. [NFPA 54:7.2.6.2]

  TABLE 1210.3.5.1

  SUPPORT OF PIPING

  [NFPA 54: TABLE 7.2.6.2]

  STEEL PIPE, NOMINAL SIZE OF PIPE (inches)	SPACING OF SUPPORTS (feet)	NOMINAL SIZE OF TUBING SMOOTH WALL (inches O.D.)	SPACING OF SUPPORTS (feet)
  1⁄2	6	1⁄2	4
  3⁄4 or 1	8	5⁄8 or3⁄4	6
  11⁄4 or larger (horizontal)	10	7⁄8 or 1 (horizontal)	8
  11⁄4 or larger (vertical)	Every floor level	1 or larger (vertical)	Every floor level

  For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

• CMC § 505.12 Medium relevance — show source text

  PHARMACIES . . . . . . . . . . . . . . . . . . . . . . 505.12, 505.12.1

  PHARMACEUTICAL COMPOUND EXHAUST

  DISCHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507.7

  PILOT

  Boilers. . . . . . . . . . . . . . 1006.1, 1007.1, C 106.0, C 107.0

  Continuous, definition . . . . . . . . . . . . . . . . . . . . . . 205.0

  Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0

  Intermittent, definition. . . . . . . . . . . . . . . . . . . . . . . 211.0

  Interrupted, definition . . . . . . . . . . . . . . . . . . . . . . . 211.0

  PIPE INSULATION REQUIREMENTS . . . . . . . . . . . 1217.10.1

  PIPING

  Fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . 1308.0, 1310.0

  Hangers, supports and anchors . . . . . . . 313.0, 1105.2,

  1109.6, 1210.3,

  1310.3.5, 1310.3.5.1,

  Table 313.3, Table 1310.3.5.1

  Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1

  Identification . . . . . . . . . . . . . . . . . . . . . 1109.10, 1204.0

  Joints and connections. . . . . . . . . . . . . . . . . (see Joints

  and connections)

  Protection of . . . . . . . . . . . . . . . . . . . . . 316.0, 1109.4.1,

  1310.1.3, 1310.1.4

  Trenching, excavation,

  and backfill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317.0

  Underground . . . . . . . . . . . . . 1109.5, 1109.5.1, 1310.1.6

  PIPING TYPES

  Double-wall. . . . . . . . Table 803.1.2(1), Table 803.1.2(2),

  Table 803.2(1), Table 803.2(2)

  Single-wall metal . . . . . . . . . . . . 802.7, Table 803.1.2(5)

  PLANS

  Approval by Authority

  Having Jurisdiction . . . . . . . . . . . . . . . . . . . . . . . 104.3

  2025 CALIFORNIA MECHANICAL CODE 585

• CMC § 1210.3.5.1 Medium relevance — show source text

  TABLE 1210.3.5.1

  SUPPORT OF PIPING

  [NFPA 54: TABLE 7.2.6.2]

  STEEL PIPE, NOMINAL SIZE OF PIPE (inches)	SPACING OF SUPPORTS (feet)	NOMINAL SIZE OF TUBING SMOOTH WALL (inches O.D.)	SPACING OF SUPPORTS (feet)
  1⁄2	6	1⁄2	4
  3⁄4 or 1	8	5⁄8 or3⁄4	6
  11⁄4 or larger (horizontal)	10	7⁄8 or 1 (horizontal)	8
  11⁄4 or larger (vertical)	Every floor level	1 or larger (vertical)	Every floor level

  For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

  1210.3.5.2 Expansion and Contraction. Supports, hangers, and anchors shall be installed so as not to interfere with the free expansion and contraction of the piping between anchors. All parts of the supporting system shall be designed and installed so they are not disengaged by movement of the supported piping. [NFPA 54:7.2.6.3] 1210.3.5.3 Piping on Roofs. Gas piping installed on the roof surfaces shall be supported in accordance with Table 1210.3.5.1. Gas piping shall be elevated not less than 3½ inches (89 mm) above the roof surface. [NFPA 54:7.2.6.4.1, 7.2.6.4.2] 1210.4 Concealed Piping in Buildings. Gas piping in concealed locations shall be installed in accordance with this section. [NFPA 54:7.3.1]

  TABLE 1210.3.5.1

  SUPPORT OF PIPING

  [NFPA 54: TABLE 7.2.6.2]

  For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

  2025 CALIFORNIA PLUMBING CODE 225

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  FUEL GAS PIPING

  1210.4.1 Connections. Where gas piping is to be concealed, connections shall be of the following type:

  (1) Pipe fittings such as elbows, tees, couplings, and right/left nipple/couplings.

  (2) Joining tubing by brazing (see Section 1208.5.9.1).

  (3) Press-connect fittings listed to ANSI LC 4/CSA 6.32.

  (4) CSST fittings listed to CSA/ANSI LC 1/CSA 6.26.

• CMC § 7.2.1 Medium relevance — show source text

  (4) Where piping is encased in a protective pipe sleeve, the annular spaces between the gas piping and the sleeve and between the sleeve and the wall opening shall be sealed.

  (5) Piping installed outdoors shall be elevated not less than 3½ inches (89 mm) above the ground.

  (6) Sealing materials shall be compatible with the piping and sleeve. [NFPA 54:7.2.1] 1210.3.1 Protective Coating. Where piping is in contact with a material or an atmosphere corrosive to the piping system, the piping and fittings shall be coated with a corrosion-resistant material. Any such coating used on piping or components shall not be considered as adding strength to the system. [NFPA 54:7.2.2] 1210.3.2 Building Structure. The installation of gas piping shall not cause structural stresses within building components to exceed allowable design limits. Approval shall be obtained before any beams or joists are cut or notched. [NFPA 54:7.2.3.1 – 7.2.3.2] 1210.3.3 Gas Piping to be Sloped. Piping for other than dry gas conditions shall be sloped not less than [1] ⁄ 4 inch in 15 feet (6.4 mm in 4.6 m) to prevent traps. [NFPA 54:7.2.4] 1210.3.3.1 Ceiling Locations. Gas piping shall be permitted to be installed in accessible spaces between a fixed ceiling and a dropped ceiling, whether or not such spaces are used as a plenum. Valves shall not be located in such spaces.

  Exception: Appliance or equipment shutoff valves required by this code shall be permitted to be installed in accessible spaces containing vented appliances. 1210.3.4 Prohibited Locations. Gas piping inside any building shall not be installed in or through a clothes chute, chimney or gas vent, dumbwaiter, elevator shaft, or air duct, other than combustion air ducts. [NFPA 54:7.2.5]

  Exception: Ducts used to provide ventilation air in accordance with Section 506.0 or to above-ceiling spaces in accordance with Section 1210.3.3.1.

  1210.3.5 Hangers, Supports, and Anchors. Piping shall be supported with metal pipe hooks, metal pipe straps, metal bands, metal brackets, metal hangers, or building structural components, suitable for the size of piping, of adequate strength and quality, and located at intervals so as to prevent or damp out excessive vibration. Piping shall be anchored to prevent undue strains on connected appliances and equipment and shall not be supported by other piping. Pipe hangers and supports shall conform to the requirements of MSS SP-58. [NFPA 54:7.2.6.1] 1210.3.5.1 Spacing. Spacing of supports in gas piping installations shall not be greater than shown in Table 1210.3.5.1. Spacing of supports of CSST shall be in accordance with the CSST manufacturer’s instructions. [NFPA 54:7.2.6.2]

  TABLE 1210.3.5.1

  SUPPORT OF PIPING

  [NFPA 54: TABLE 7.2.6.2]

• CMC § 1215.0 Medium relevance — show source text

  HYDRONIC SPACE HEATING . . . . . . . . . . . . . . . . . 1215.0

  HYDRONICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 12

  Auxiliary systems . . . . . . . . . . . . . . . . . . . . . . . . 1220.0

  Appliances and equipment . . . . . . . . . . . . . . . . . 1207.0

  Boilers . . . . . . . . . . . . . . . . . . 1207.2, 1207.2.1, 1207.2.2

  Circulators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1208.0

  Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1221.7

  Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0

  Embedded piping and joints . . . . . . . . . . . . . . . . 1221.2

  Expansion tanks . . . . . . . . . . . . . . . . . . . . . . . . . 1209.0

  Hangers and supports. . . . . . . . . . . . . . . . . . . . . 1210.3

  Heat emitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1201.7

  Heat pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1207.5

  Heat sources . . . . . . . . . . . . . . . . . . . . . . . . . . . 1203.1

  Heat transfer fluid . . . . . . . . . . . . . . . . . . 1201.3, 1204.7

  Identification of piping . . . . . . . . . . . . . . . . . . . . . 1204.0

  Installation . . . . . . . . . . . . . . . . . . . . . . . 1205.0, 1221.0

  Insulation. . . . . . . . . 1201.2, 1217.8.2, 1217.10, 1220.4.7

  Joints and connections . . . . . . . . . . . . . . . . . . . . 1211.0

  Materials . . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1

  Protection of potable water supply . . . . . . . . . . . 1202.0

  Radiant heating and cooling . . . . . . . . . . . . . . . . 1217.0

  Snow melt systems . . . . . . . . . . . . . . . . 1220.4, 1220.0,

  1217.8.2, Table 1220.4.2

• CMC § 508.5.2 Medium relevance — show source text

  Noncanopy-type. . . . . . . . . . . . . . . . . . . . . . . . . 508.5.2 Product conveying. . . . . . . . . . . . . . . . . . . . . . . . . 506.0 Seams, joints and penetration . . . . . . . . . . . . . . 508.3.2

  Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.5

  Solid-fuel. . . . . . . . . . . . . . . . . . . . . . . . . . . 508.6, 517.3

  Type I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0, 508.3 Type II. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0, 519.0

  Ultraviolet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.2.1

  Ventilating . . . . . . . . . . . . . . . . . . . . . . 802.2.1, 802.2.4,

  802.3.4, 802.12, 921.2

  HOT PLATES . . . . . . . . . . . . . . . . . . . . . . . . . . 918.2–918.4,

  HYDRONIC SPACE HEATING . . . . . . . . . . . . . . . . . 1215.0

  HYDRONICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 12

  Auxiliary systems . . . . . . . . . . . . . . . . . . . . . . . . 1220.0

  Appliances and equipment . . . . . . . . . . . . . . . . . 1207.0

  Boilers . . . . . . . . . . . . . . . . . . 1207.2, 1207.2.1, 1207.2.2

  Circulators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1208.0

  Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1221.7

  Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0

  Embedded piping and joints . . . . . . . . . . . . . . . . 1221.2

  Expansion tanks . . . . . . . . . . . . . . . . . . . . . . . . . 1209.0

  Hangers and supports. . . . . . . . . . . . . . . . . . . . . 1210.3

• CMC § 5505.1.2 Medium relevance — show source text

  5505.1.2 Piping systems. Piping, tubing, valves and joints and fittings conveying cryogenic fluids shall be installed in accordance with the material-specific provisions of Section 5501.1 and Sections 5505.1.2.1 through 5505.1.2.6.

  5505.1.2.1 Design and construction. Piping systems shall be suitable for the use intended through the full range of pressure and temperature to which they will be subjected. Piping systems shall be designed and constructed to provide adequate allowance for expansion, contraction, vibration, settlement and fire exposure.

  5505.1.2.2 Joints. Joints on container piping and tubing shall be threaded, welded, silver brazed or flanged.

  5505.1.2.3 Valves and accessory equipment. Valves and accessory equipment shall be suitable for the intended use at the temperatures of the application and shall be designed and constructed to withstand the maximum pressure at the minimum temperature to which they will be subjected.

  5505.1.2.3.1 Shutoff valves on containers. Shutoff valves shall be provided on all container connections except for pressure relief devices. Shutoff valves shall be provided with access thereto and located as close as practical to the container.

  5505.1.2.3.2 Shutoff valves on piping. Shutoff valves shall be installed in piping containing cryogenic fluids where needed to limit the volume of liquid discharged in the event of piping or equipment failure. Pressure relief valves shall be installed where liquid is capable of being trapped between shutoff valves in the piping system (see Section 5503.2).

  5505.1.2.4 Physical protection and support. Piping systems shall be supported and protected from physical damage. Piping passing through walls shall be protected from mechanical damage.

  5505.1.2.5 Corrosion protection. Above-ground piping that is subject to corrosion because of exposure to corrosive atmospheres, shall be constructed of materials to resist the corrosive environment or otherwise protected against corrosion. Belowground piping shall be protected against corrosion.

  5505.1.2.6 Testing. Piping systems shall be tested and proven free of leaks after installation as required by the standards to which they were designed and constructed. Test pressures shall be not less than 150 percent of the maximum allowable working pressure where hydraulic testing is conducted or 110 percent where testing is conducted pneumatically.

  5505.2 Indoor use. Indoor use of cryogenic fluids shall comply with the material-specific provisions of Section 5501.1.

  5505.3 Outdoor use. Outdoor use of cryogenic fluids shall comply with the material specific provisions of Sections 5501.1, 5505.3.1 and 5505.3.2.

  5505.3.1 Separation. Distances from lot lines, buildings and exposure hazards shall comply with Section 5504.3 and the materialspecific provisions of Section 5501.1.

  5505.3.2 Emergency shutoff valves. Manual or automatic emergency shutoff valves shall be provided to shut off the cryogenic fluid supply in case of emergency. An emergency shutoff valve shall be located at the source of supply and at the point where the system enters the building.

  5505.4 Filling and dispensing. Filling and dispensing of cryogenic fluids shall comply with Sections 5505.4.1 through 5505.4.3.