How must regulator vents and remote vent piping be installed and protected?

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

• CPC § 1208.5.5 High relevance — show source text

  1208.5.5 Regulator Vent Piping. Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC (Schedule 40 and 80). PVC vent piping shall not be installed indoors. {NFPA 54:5.5.4.2}

  1208.5.6 Anodeless Risers. Anodeless risers shall

  comply with Section 1208.5.6.1 through Section 1208.5.6.3.

  1208.5.6.1 Factory-Assembled Anodeless Risers. Factory-assembled anodeless risers shall be recommended by the manufacturer for the gas used and shall be leak tested by the manufacturer in accordance with written procedures. [NFPA 54:5.5.4.3(1)]

  1208.5.6.2 Service Head Adapters and Field- Assembled Anodeless Risers. Service head

  adapters and field-assembled anodeless risers incorporating service head adapters shall be recommended by the manufacturer for the gas used and shall be design-certified to meet the requirements of Category I of ASTM D2513 and 49 CFR 192.281(e). The manufacturer shall provide the user qualified installation instructions as prescribed by 49 CFR 192.283(b).

  [NFPA 54:5.5.4.3(2)]

  1208.5.6.3 Undiluted Liquefied Petroleum Gas Piping. The use of plastic pipe, tubing, and fittings in undiluted LP-Gas piping systems shall be in accordance with NFPA 58. [NFPA 54:5.5.4.3(3)]

  1208.5.7 Workmanship and Defects. Gas pipe, tubing, and fittings shall be clear and free from cutting burrs and defects in structure or threading and shall be thoroughly brushed and chip and scale blown. Defects in pipe, tubing, and fittings shall not be repaired. Defective pipe, tubing, and fittings shall be replaced. [NFPA 54:5.5.5]

  1208.5.8 Metallic Pipe Threads. Metallic pipe and fitting threads shall be taper pipe threads and shall comply with ASME B1.20.1. [NFPA 54:5.5.6.1]

  1208.5.8.1 Damaged Threads. Pipe with threads that are stripped, chipped, corroded, or otherwise damaged shall not be used. Where a weld opens during the operation of cutting or threading, that portion of the pipe shall not be used. [NFPA 54:5.5.6.2]

  1208.5.8.2 Number of Threads. Field threading of metallic pipe shall be in accordance with Table 1208.5.8.2. [NFPA 54:5.5.6.3]

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  with the dimensional standards of ASME B36.10M

  and one of the following:

  (1) ASTM A53

  (2) ASTM A106

  (3) ASTM A312 {NFPA 54:5.5.2.2}

  1208.5.2.3 Copper and Copper Alloy Pipe. Copper and copper alloy pipe shall not be used if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard cubic feet (scf) of gas (0.7 mg/100 L).

• CPC § 404.3 High relevance — show source text

  2025 CALIFORNIA PLUMBING CODE 411

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  APPENDIX E

  E 404.3 Mechanical Protection. All gas outlet risers, regulators, meters, valves, and other exposed equipment shall be protected against accidental damage. [NFPA 501A:4.4.3]

  E 404.4 Special Rules on Atmospherically Con- trolled Regulators. Atmospherically controlled regulators shall be installed in such a manner that moisture cannot enter the regulator vent and accumulate above the diaphragm. Where the regulator vent is obstructed due to snow and icing conditions, shields, hoods, or other suitable devices shall be provided to guard against closing of the vent opening. [NFPA 501A:4.4.4.1 – 4.4.4.2]

  E 404.5 Fuel Gas Piping Test. The manufactured home fuel gas piping system shall be tested only with air before it is connected to the gas supply. The manufactured home gas piping system shall be subjected to a pressure test with all appliance shutoff valves in their closed positions. [NFPA 501A:4.4.5]

  E 404.5.1 Procedures. The fuel gas piping test shall consist of air pressure at not less than 10 inches water column or more than 14 inches water column (2.5 kPa to 3.5 kPa). The fuel gas piping system shall be isolated from the air pressure source and shall maintain this pressure for not less than 10 minutes without perceptible leakage. Upon satisfactory completion of the fuel gas piping test, the appliance valves shall be opened, and the gas appliance connectors shall be tested with soapy water or bubble solution while under the pressure remaining in the piping system. Solutions used for testing for leakage shall not contain corrosive chemicals. Pressure shall be measured with a manometer, slope gauge, or gauge that is calibrated in either water inch (mm) or psi (kPa) with increments of either [1] ⁄ 10 inch (2.5 mm) or [1] ⁄ 10 psi (0.7 kPa) gauge, as applicable. Upon satisfactory completion of the fuel gas piping test, the manufactured home gas supply connector shall be installed, and the connections shall be tested with soapy water or bubble solution. [NFPA 501A:4.4.5.1.1 – 4.4.5.1.6]

  E 404.5.2 Warning. The following warning shall be supplied to the installer:

  WARNING: Do not overpressurize the fuel gas piping system. Damage to valves, regulators, and appliances can occur due to pressurization beyond the maximums specified. [NFPA 501A:4.4.5.2]

  E 404.5.3 Vents. Gas appliance vents shall be visually inspected to ensure that they have not been dislodged in transit and are connected securely to the appliance.

  [NFPA 501A:4.4.5.3]

  E 404.6 Oil Tanks. Oil tank capacities shall comply with the following:

  (1) No more than one 660 gallon (2498 L) tank or two tanks with an aggregate capacity of 660 gallons (2498 L) or less shall be connected to one oil-burning appliance.

• CPC § 1208.3.1 High relevance — show source text

  TABLE 1208.3.1

  APPROXIMATE GAS INPUT FOR

  TYPICAL APPLIANCES

  [NFPA 54: TABLE A.5.3.2.1]

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  For SI units: 1000 British thermal units per hour = 0.293 kW

  2025 CALIFORNIA PLUMBING CODE 217

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  FUEL GAS PIPING

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  1208.5.4 Plastic Pipe, Tubing, and Fittings. Polyethylene plastic pipe, tubing, and fittings used to supply fuel gas shall conform to ASTM D2513. Pipe to be used shall be marked “gas” and “ASTM D2513.” Polyamide pipe, tubing, and fittings shall be identified in and conform to ASTM F2945. Pipe to be used shall be marked “gas” and “ASTM F2945.” Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) plastic pipe, tubing, and fittings shall not be used to supply fuel gas. [NFPA 54:5.5.4.1.1 – 5.5.4.1.3]

  1208.5.5 Regulator Vent Piping. Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC (Schedule 40 and 80). PVC vent piping shall not be installed indoors. {NFPA 54:5.5.4.2}

  1208.5.6 Anodeless Risers. Anodeless risers shall

  comply with Section 1208.5.6.1 through Section 1208.5.6.3.

  1208.5.6.1 Factory-Assembled Anodeless Risers. Factory-assembled anodeless risers shall be recommended by the manufacturer for the gas used and shall be leak tested by the manufacturer in accordance with written procedures. [NFPA 54:5.5.4.3(1)]

  1208.5.6.2 Service Head Adapters and Field- Assembled Anodeless Risers. Service head

  adapters and field-assembled anodeless risers incorporating service head adapters shall be recommended by the manufacturer for the gas used and shall be design-certified to meet the requirements of Category I of ASTM D2513 and 49 CFR 192.281(e). The manufacturer shall provide the user qualified installation instructions as prescribed by 49 CFR 192.283(b).

  [NFPA 54:5.5.4.3(2)]

  1208.5.6.3 Undiluted Liquefied Petroleum Gas Piping. The use of plastic pipe, tubing, and fittings in undiluted LP-Gas piping systems shall be in accordance with NFPA 58. [NFPA 54:5.5.4.3(3)]

• CPC § 2025 High relevance — show source text

  Chapter 7 Sanitary Drainage.

  This chapter regulates the design and installation of sanitary drainage systems to ensure they will work as intended. Drainage piping should not be oversized nor undersized, and constructed of approved materials to guard against fouling, deposit of solids, clogging, and with cleanouts so arranged that the pipes may be readily cleaned. The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment to an approved point of disposal, such as a public sanitary system or private sewage disposal system.

  The basics of a sanitary drainage system include public and private sewage disposal; selection of materials; installation of the building drain and sewer; joining methods for pipe and fittings; drainage fixture units for sizing the drainage system; sumps and ejectors; vent sizing and length of vents; and testing.

  Chapter 8 Indirect Wastes.

  Chapter 8 regulates indirect waste connections that are required for plumbing fixtures and plumbing appliances dealing with food preparation, dishwashing, potable liquids, and similar equipment. An indirect connection prevents sewage from backing up into a fixture or appliance, thus providing protection against potential health hazards. The waste pipe discharges through an air gap or air break into a waste receptor or standpipe. The protection in the form of an air gap is necessary when the contamination is a potential health hazard or cross connection with the potable water system. Where there is no possibility of contaminating the potable water (nonpotable discharge), the indirect waste pipe may connect in the form of an air break. This method is often preferred to prevent splashing. In addition, health care facilities and special wastes must be protected from contamination that may result from the connection to the drainage system. The waste must be treated to prevent any damage to the piping or sewage treatment process. Waste receptors are sized and designed to prevent splashing and allow for peak discharge conditions.

  Chapter 9 Vents.

  Chapter 9 regulates the material, design, and installation of vents. A vent system is a pipe or pipes installed in a drainage system that provide a flow of air to and from the system to ventilate it, provide a circulation of air to eliminate trap siphonage, and reduce back-pressure and vacuum surge. In addition, vents provide the rapid and silent flow of waste without exposing occupants of the building to any sewer gases. Proper installation of vents is crucial, as a telltale sign that there is a problem in the drain and vent system is related to the elevation of the horizontal portion of the venting. Venting is not limited to sanitary drainage systems. Venting methods are applicable to other drainage systems such as those for chemical waste, graywater waste, and clear water waste. Sizing the venting system is directly tied to the design of the drainage system. For example, the velocities in the drainage system and its peak flow rates affect the diameters in the venting system. Where the vertical distance between a fixture outlet and trap is excessive, velocities in the entire drainage system will be greater than those in the vent sizing table. All venting methods in this chapter are categorized as either dry vents or wet vents. Vent stacks, stack vents, branch vents, island vents, relief vents, and individual vents are dry vents. Wet vents (horizontal or vertical), circuit vents, combination drain and vents are versions of “wet venting” in which the vent is wetted by drainage flow.

  2025 CALIFORNIA PLUMBING CODE xv

• CPC § 1208.5 High relevance — show source text

  FUEL GAS PIPING

  (2) A listed gas appliance regulator factory equipped with a vent limiting device is not required to be vented to the outdoors.

  (2) Materials for vent piping shall be in accordance with Section 1208.5 through Section 1208.5.12.5.

  (3) The vent terminus shall be designed to prevent the entry of water, insects, and other foreign matter that could cause blockage.

  (4) Vent piping shall be installed to minimize static loads and bending moments placed on the regulators and gas pressure control devices.

  (5) Vents shall terminate not less than 3 feet (914 mm) from a possible source of ignition.

  (6) At locations where a vent termination could be submerged during floods or snow accumulations, an antiflood-type breather vent fitting shall be installed, or the vent terminal shall be located above the height of the expected flood waters or snow.

  (7) Vent piping from pressure regulators and gas pressure controls shall not be connected to a common manifold

  that serves a bleed line from a diaphragm-type gas valve.

  [NFPA 54:5.14]

  TABLE 1208.13

  MANUAL GAS VALVE STANDARDS

  [NFPA 54: TABLE 5.11]

  1209.0 Excess Flow Valve.

  1209.1 General. Where automatic excess flow valves are installed, they shall be listed in accordance with ANSI Z21.93/CSA 6.30 and shall be sized and installed in accor dance with the manufacturers’ instructions. [NFPA 54:5.12]

  1210.0 Gas Piping Installation.

  1210.1 Piping Underground. Underground gas piping shall be installed with sufficient clearance from any other underground structure to avoid contact therewith, to allow maintenance, and to protect against damage from proximity to other structures. Underground plastic piping shall be installed with sufficient clearance or shall be insulated from any source of heat so as to prevent the heat from impairing the serviceability of the pipe. [NFPA 54:7.1.1.1 – 7.1.1.2]

  1210.1.1 Cover Requirements. Underground piping systems shall be installed with a minimum of 12 inches (305 mm) of cover. The minimum cover shall be increased to 18 inches (457 mm) if external damage to the pipe or tubing from external forces is likely to result. Where a minimum of 12 inches (305 mm) of cover cannot be provided, the piping shall be installed in conduit.

  [NFPA 54:7.1.2.1 – 7.1.2.1(B)]

  1210.1.2 Trenches. The trench shall be graded so that the pipe has a firm, substantially continuous bearing on the bottom of the trench. [NFPA 54:7.1.2.2]

  1210.1.2.1 Backfilling. Where flooding of the trench is done to consolidate the backfill, care shall be exercised to see that the pipe is not floated from its firm bearing on the trench bottom. [NFPA 54:7.1.2.3]

  1210.1.3 Protection Against Corrosion. Steel pipe and steel tubing installed underground shall be installed in accordance with Section 1210.1.3.1 through Section 1210.1.3.9. [NFPA 54:7.1.3]

• CPC § 10-09 High relevance — show source text

  B. PG&E will position gas regulators to minimize the length of the regulator vent lines and to ensure adequate venting capacity.

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  C. PG&E will specify regulator vent lines, in accordance with Gas Design Standard H 93, Regulator Vent Lines

  Above Ground,” when required.

  3. Regulator Vent Locations

  A. Service regulator vents must terminate in a safe outside location that complies with the following criteria:

  (1) The regulator vent must not terminate near any sources of ignition or openings into the building. The regulator vent must be 36 inches horizontally from sources of ignition and openings into the building, and this clearance area will extend 10 feet above and 36 inches below the regulator vent termination.

  (2) A minimum lateral distance of 8 feet from a forced air intake. This includes the intake vents for the gas meter room.

  (3) Within any location that is under display platforms or show windows in commercial buildings, including any permanent, elevated, display floors or platforms associated with the window.

  (4) Within any location that is under building overhangs, where the overhang is likely to direct venting gas into a building opening.

  B. Vents for all natural gas regulator and gas monitor diaphragm equipment must terminate above a reasonable flood level. Regulator vent extensions must be separate lines, terminated so they are protected from the rain and provided with screened fittings to prevent insects and other debris from entering the vent.

  C. Vent locations must have final approval by PG&E.

  Page 6 of 11 PG&E Internal Information, SL2 © 2013 Pacific Gas & Electric Company. All Rights Reserved. Prepared by: AAJ7

  Gas Meter Room J-16

  Rev. #03a 10-09-13

  Requirements for PG&E-Owned Equipment

  1. Natural Gas Metering

  Electrical grounding or bonding to PG&E’s metering facility piping or equipment or to customer-owned house lines inside of the meter room is not permitted.

  2. Land-Line Cable and Conduit

  Customers with an estimated average use of 10,000 therms per month or more are required to install, own, and maintain a nominal 1” diameter conduit and a telephone cable. PG&E’s requirements for the conduit are described below.

  A. Applicant/customer must extend the conduit and telephone cable from the closest telephone service location (i.e., outdoor “general purpose” area) to a location specified by PG&E that will be at or near the gas metering facilities. The maximum allowable distance from the telephone service location to PG&E’s gas meter is 50 feet.

  B. Conduit must terminate within 3 feet of the gas meter location.

  C. Applicant must install a conduit seal, inside the gas meter room, within 18 inches of the boundary where the conduit enters the gas meter room. There must be no conduit fitting between the boundary and the seal. PG&E will pour the conduit seal.

  D. Applicant/customer is responsible for all charges and costs associated with installing the telephone facilities necessary to provide telephone service for PG&E’s gas metering facilities which are to be used for PG&E’s purposes.

  E. PG&E is responsible for establishing telephone service and for the ongoing telephone service charges for gas metering purposes.

  3. Additional Equipment Needed to Support Gas Meters

  Consideration must be given to the design requirements for:

  A. Volume pulse output connections.

  B. Electronic correctors.

• CPC § 10-09 High relevance — show source text

  3. Mechanical fans and all other electric devices must be explosion proof and meet the requirements of the NFPA-70: National Electric Code for Class I, Division 1, Group D locations.

  4. Mechanical fans and detection equipment must be continuously monitored in case of failure. Alarms for trouble and failure must be installed in accordance with NFPA-72, National Fire Alarm Code.

  Prepared by: AAJ7 PG&E Internal Information, SL2 © 2013 Pacific Gas & Electric Company. All Rights Reserved. Page 5 of 11

  Gas Meter Room J-16

  Rev. #03a 10-09-13

  Natural Gas Regulator Requirements

  1. Natural Gas Regulators

  Typically PG&E will install natural gas service regulators and overpressure protection devices outside of a meter room. Applicants/customers who want to install gas service regulators and overpressure protection devices inside of a meter room must provide PG&E with the written justification as part of the application. The preferred gas riser, meter and regulator location is outside and adjacent to the building being served. On an exception basis, gas meters and regulators may be installed in a specially designed gas meter room. PG&E must approve all gas meter and regulator installations and the gas meter room design in advance of any construction. If acceptable to PG&E, the following additional conditions apply:

  A. Each gas service regulator installed within a building must be located as near as practical to the point of the service line entrance into the meter room, and as specified by PG&E.

  B. PG&E will specify materials and designs for any overpressure protection devices needed, as outlined in Items 2 and 3 below.

  2. Regulator Vent Lines

  A. Regulators and any additional overpressure protection equipment installed indoors must be vented to the outdoors. The customer is required to provide holes (penetrations) through walls or ceilings for these vents. In rare situations where the meter room location is not adjacent to an outside wall, the customer is required to install the vent piping from the meter room to the outside wall (PG&E will determine pipe size and location). PG&E will be responsible for connecting the vent piping to the regulator or overpressure protection device.

  B. PG&E will position gas regulators to minimize the length of the regulator vent lines and to ensure adequate venting capacity.

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  C. PG&E will specify regulator vent lines, in accordance with Gas Design Standard H 93, Regulator Vent Lines

  Above Ground,” when required.

  3. Regulator Vent Locations

  A. Service regulator vents must terminate in a safe outside location that complies with the following criteria:

  (1) The regulator vent must not terminate near any sources of ignition or openings into the building. The regulator vent must be 36 inches horizontally from sources of ignition and openings into the building, and this clearance area will extend 10 feet above and 36 inches below the regulator vent termination.

  (2) A minimum lateral distance of 8 feet from a forced air intake. This includes the intake vents for the gas meter room.

  (3) Within any location that is under display platforms or show windows in commercial buildings, including any permanent, elevated, display floors or platforms associated with the window.

  (4) Within any location that is under building overhangs, where the overhang is likely to direct venting gas into a building opening.

• CPC § 0.293 High relevance — show source text

  automatic storage
  30 to 40 gallon tank
  Water heater, automatic storage
  50 gallon tank
  Water heater, automatic instantaneous
  Capacity at 2 gallons per minute
  Capacity at 4 gallons per minute
  Capacity at 6 gallons per minute
  Water heater, domestic, circulating or
  side-arm|
  
  35 000
  
  50 000
  
  142 800
  285 000
  428 400
  
  35 000| |
  
  
  
  Cooking Appliances
  Range, freestanding, domestic
  Built-in oven or broiler unit, domestic
  Built-in top unit, domestic|
  65 000
  25 000
  40 000| |
  
  
  
  
  
  Other Appliances
  Refrigerator
  Clothes dryer, Type 1 (domestic)
  Gas fireplace direct-vent
  Gas log
  Barbecue
  Gaslight|
  3000
  35 000
  40 000
  80 000
  40 000
  2500|

  For SI units: 1000 British thermal units per hour = 0.293 kW

  1208.3.2 Sizing Methods. Gas piping shall be sized in accordance with one of the following:

  (1) Pipe sizing tables or sizing equations in this chap ter.

  (2) Sizing tables included in a listed piping system manufacturer’s installation instructions.

  (3) Engineering methods. [NFPA 54:5.3.3]

  1208.3.3 Allowable Pressure Drop. The design pressure loss in a piping system from the point of delivery to

  TABLE 1208.3.1

  APPROXIMATE GAS INPUT FOR

  TYPICAL APPLIANCES

  [NFPA 54: TABLE A.5.3.2.1]

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  For SI units: 1000 British thermal units per hour = 0.293 kW

  2025 CALIFORNIA PLUMBING CODE 217

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  FUEL GAS PIPING

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  1208.5.4 Plastic Pipe, Tubing, and Fittings. Polyethylene plastic pipe, tubing, and fittings used to supply fuel gas shall conform to ASTM D2513. Pipe to be used shall be marked “gas” and “ASTM D2513.” Polyamide pipe, tubing, and fittings shall be identified in and conform to ASTM F2945. Pipe to be used shall be marked “gas” and “ASTM F2945.” Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) plastic pipe, tubing, and fittings shall not be used to supply fuel gas. [NFPA 54:5.5.4.1.1 – 5.5.4.1.3]

  1208.5.5 Regulator Vent Piping. Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC (Schedule 40 and 80). PVC vent piping shall not be installed indoors. {NFPA 54:5.5.4.2}

• CPC § 5.5.3.2 High relevance — show source text

  ** Steel tubing shall comply with ASTM A254. [NFPA 54:5.5.3.2] 1308.4.3.2 Stainless Steel Tubing. Stainless steel tubing shall comply with one of the following: (1) ASTM A268 (2) ASTM A269 [NFPA 54:5.5.3.3] 1308.4.3.3 Copper and Copper Alloy Tubing. Copper and copper alloy tubing shall not be used if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 scf of gas (0.7 mg/100 L). Copper tubing shall comply with standard Type K or Type L of ASTM B88 or ASTM B280. [NFPA 54:5.5.3.4] 1308.4.3.4 Aluminum Alloy Tubing. Aluminum alloy tubing shall comply with ASTM B210 or ASTM B241. Aluminum alloy tubing shall be coated to protect against external corrosion where it is in contact with masonry, plaster, or insulation or is subject to repeated wettings by such liquids as water, detergent, or sewage. Aluminum alloy tubing shall not be used in exterior locations or underground. [NFPA 54:5.5.3.5] 1308.4.3.5 Corrugated Stainless Steel Tubing. Corrugated stainless steel tubing shall be listed in accordance with CSA/ANSI LC 1/CSA 6.26. [NFPA 54:5.5.3.6] 1308.4.4 Plastic Pipe, Tubing, and Fittings. Polyethylene plastic pipe, tubing, and fittings used to supply fuel gas shall conform to ASTM D2513. Pipe to be used shall be marked “gas” and “ASTM D2513.” [NFPA 54:5.5.4.1.1] Polyamide pipe, tubing, and fittings shall be identified in and conform to ASTM F2945. Pipe to be used shall be marked “gas” and “ASTM F2945.” [NFPA 54:5.5.4.1.2] Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) plastic pipe, tubing, and fittings shall not be used to supply fuel gas. [NFPA 54:5.5.4.1.3] 1308.4.4.1 Regulator Vent Piping. Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC (Schedule 40 and 80). PVC vent piping shall not be installed indoors. {NFPA 54:5.5.4.2}

  1308.4.4.2 Anodeless Risers. Anodeless risers shall comply with Section 1308.4.4.2.1 through Section 1308.4.4.2.3.

• CPC § 5.9.2 High relevance — show source text

  (1) Check valves.

  (2) Three-way valves (of the type that completely closes one side before starting to open the other side).

  (3) Reverse flow indicators controlling positive shutoff valves.

  (4) Normally closed air-actuated positive shutoff pressure regulators. [NFPA 54:5.9.2] 1308.11 Low-Pressure Protection. A protective device shall be installed between the meter and the appliance or equipment if the operation of the appliance or equipment is such that it could produce a vacuum or a dangerous reduction in gas pressure at the meter. Such protective devices include, but are not limited to, mechanical, diaphragm-operated, or electrically operated low-pressure shutoff valves. [NFPA 54:5.10]

  1308.12 Shutoff Valves. Shutoff valves shall be selected in

  accordance with Table 1308.12. Shutoff valves of size 1 inch

  (25 mm) National Pipe Thread and smaller shall be listed and labeled. Where used outdoors, such use shall be in accordance with the manufacturer’s recommendation. [NFPA 54:5.11]

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  282 2025 CALIFORNIA MECHANICAL CODE

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  FUEL GAS PIPING

  Exceptions: (1) A regulator and vent limiting means combination listed as complying with CSA/ANSI Z21.80/CSA 6.22, shall not be required to be vented to the outdoors.

  (2) A listed gas appliance regulator factory equipped with a vent limiting device is not required to be vented to the outdoors.

  (2) Materials for vent piping shall be in accordance with Section 1308.4 through Section 1308.4.10.5. (3) The vent terminus shall be designed to prevent the entry of water, insects, and other foreign matter that could cause blockage. (4) Vent piping shall be installed to minimize static loads and bending moments placed on the regulators and gas pressure control devices.

  (5) Vents shall terminate not less than 3 feet (914 mm) from a possible source of ignition. (6) At locations where a vent termination could be submerged during floods or snow accumulations, an antiflood-type breather vent fitting shall be installed, or the vent terminal shall be located above the height of the expected floodwaters or snow.

  (7) Vent piping from pressure regulators and gas pressure controls shall not be connected to a common manifold that serves a bleed line from a diaphragm-type gas valve.

  [NFPA 54:5.14]

  1309.0 Excess Flow Valve.

  1309.1 General. Where automatic excess flow valves are installed, they shall be listed in accordance with ANSI Z21.93/CSA 6.30 and shall be sized and installed in accordance with the manufacturers’ instructions. [NFPA 54:5.12]

  1310.0 Gas Piping Installation. 1310.1 Piping Underground. Underground gas piping shall be installed with sufficient clearance from any other underground structure to avoid contact therewith, to allow maintenance, and to protect against damage from proximity to other structures. Underground plastic piping shall be installed with sufficient clearance or shall be insulated from any source of heat so as to prevent the heat from impairing the serviceability of the pipe.

• CPC § 1310.5.1 High relevance — show source text

  1310.5.1 Pressure Reduction. Where pressure reduction is required in branch connections for compliance with Section 1310.6, such reduction shall take place either inside the chase or immediately adjacent to the outside wall of the chase. Regulator venting and downstream overpressure protection shall comply with Section 1308.6.4 and Section 1308.7. The regulator shall be accessible for service and repair, and vented in accordance with one of the following:

  (1) Where the fuel gas is lighter than air, regulators equipped with a vent limiting means shall be permitted to be vented into the chase. Regulators not equipped with a vent limiting means shall be permitted to be vented either directly to the outdoors or to a point within the top 1 foot (305 mm) of the chase.

  (2) Where the fuel gas is heavier than air, the regulator vent shall be vented only directly to the outdoors.

  [NFPA 54:7.4.1]

  1310.5.2 Chase Construction. Chase construction

  shall comply with local building codes with respect to fire resistance and protection of horizontal and vertical openings. [NFPA 54:7.4.2]

  1310.5.3 Ventilation. A chase shall be ventilated to the

  outdoors and only at the top. The opening(s) shall have a minimum free area [in square inches (square meters)] equal to the product of one-half of the maximum pressure in the piping [in pounds per square inch (kilopas

  cals)] times the largest nominal diameter of that piping

  [in inches (millimeters)], or the cross-sectional area of the chase, whichever is smaller. Where more than one fuel gas piping system is present, the free area for each system shall be calculated and the largest area used.

  [NFPA 54:7.4.3]

  1310.6 Maximum Operating Pressure in Buildings. The maximum operating pressure for any piping systems located inside buildings shall not exceed 5 psi (34 kPa) unless one or more of the following conditions are met:

  (1) The piping joints are welded or brazed.

  (2) The piping is joined by fittings listed to CSA/ANSI LC 4/CSA 6.32 and installed according to the manufacturer’s installation instructions.

  (3) The piping joints are flanged and all pipe-to-flange connections are made by welding or brazing.

  (4) The piping is located in a ventilated chase or otherwise enclosed for protection against accidental gas accumulation.

  (5) The piping is located inside buildings or separate areas of buildings used exclusively for one of the following:

  (a) Industrial processing or heating

  (b) Research

  (c) Warehousing

  (d) Boiler or mechanical rooms

  (6) The piping is a temporary installation for buildings under construction.

  (7) The piping serves appliances or equipment used for agricultural purposes.

  (8) The piping system is an LP-Gas piping system with an operating pressure greater than 20 psi (138 kPa) and complies with NFPA 58. [NFPA 54:5.4.4]

  1310.6.1 LP-Gas Systems Operating Below -5°F (-21°C). LP-Gas systems designed to operate below 5°F (-21°C) or with butane or a propane-butane mix shall be designed to either accommodate liquid LP-Gas or to prevent LP-Gas vapor from condensing back into a liquid. [NFPA 54:5.4.5]

• CPC § 1208.6.1.2 High relevance — show source text

  1208.6.1.2 Extreme Temperatures. Gas meters shall not be located where they will be subjected to extreme temperatures or sudden extreme changes in temperature or in areas where they are subjected to temperatures beyond those recommended by the manufacturer. [NFPA 54:5.6.2.3] 1208.6.2 Supports. Gas meters shall be supported or connected to rigid piping so as not to exert a strain on the meters. Where flexible connectors are used to connect a gas meter to downstream piping at mobile homes in mobile home parks, the meter shall be supported by a post or bracket placed in a firm footing or by other means providing equivalent support. [NFPA 54:5.6.3] 1208.6.3 Meter Protection. Meters shall be protected against overpressure, backpressure, and vacuum. [NFPA 54:5.6.4]

  1208.6.4 Identification. Gas piping at multiple meter installations shall be marked by a metal tag or other permanent means designating the building or the part of the building being supplied and attached by the installing agency. [NFPA 54:5.6.5] 1208.7 Gas Pressure Regulators. A line pressure regulator shall be installed where the gas supply pressure exceeds the maximum allowable inlet pressure of the appliance served. [NFPA 54:5.7.1]

  1208.7.1 Listing. Line pressure regulators shall be listed in accordance with CSA/ANSI Z21.80/CSA 6.22 where the outlet pressure is set to 2 psi (14 kPa) or less.

  [NFPA 54:5.7.2]

  1208.7.2 Location. The gas pressure regulator shall be accessible for servicing. [NFPA 54:5.7.3] 1208.7.3 Regulator Protection. Pressure regulators shall be protected against physical damage. [NFPA 54:5.7.4]

  1208.7.4 Regulator Vents. Regulator vents shall be in accordance with Section 1208.15. [NFPA 54:5.7.5] 1208.7.5 Identification. Line pressure regulators at multiple regulator installations shall be marked by a metal tag or other permanent means designating the building or the part of the building being supplied.

  [NFPA 54:5.7.6]

  1208.8 Overpressure Protection Required. Where the serving gas supplier delivers gas at a pressure greater than 2 psi (14 kPa) for piping systems serving appliances designed to operate at a gas pressure of 14 inches water column (3.5 kPa) or less, overpressure protection devices shall be installed. Piping systems serving equipment designed to operate at inlet pressures greater than 14 inches water column (3.5 kPa) shall be equipped with overpressure protection devices as required by the appliance manufacturer’s installation instructions. [NFPA 54:5.8.1]

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  1208.9 Overpressure Protection Devices. Overpressure protection devices shall be one of the following:

  (1) Pressure relief valve.

  (2) Monitor regulator.

  (3) Series regulator installed upstream from the line regulator and set to continuously limit the pressure on the inlet of the line regulator to the maximum values specified by Section 1208.10 or less.