CRC · California Residential Code
When are excess-flow valves and listed safety shutoffs required?
If you install an automatic excess‑flow valve under the California code, it must be a listed device (ANSI Z21.93/CSA 6.30) and be sized and installed exactly per the manufacturer’s instructions; the code section (§ 1309.1) does not itself set when an EFV is required—those thresholds are in the referenced standards, federal pipeline rules, and local/utility practice.
Last reviewed: July 6, 2026
What the code requires — plain English
- The California code section addressing excess-flow valves says simply that where automatic excess-flow valves are installed they must be listed to ANSI Z21.93/CSA 6.30 and sized and installed in accordance with the manufacturer’s instructions. See § 1309.1.
- The code text in § 1309.0 / § 1309.1 does not itself state trigger-flow thresholds, installation spacing, or which services must have an EFV — it only controls listing and that installation follow the manufacturer.
The single most important rule: if you install an automatic excess‑flow valve, it must be a listed device and you must size and install it exactly the way the manufacturer’s instructions and listing require. (See § 1309.1.)
Requirements in detail
What § 1309.0 / § 1309.1 actually say (short)
- § 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.
That is the controlling text from the CRC/Mechanical Code; it is purposefully limited to listing and installation conformity. It does not itself prescribe which services must have EFVs or numerical trip settings.
Decision-relevant dimensions (quick reference table)
| Decision factor | Values / what to look for | What the code requires | Code Reference |
|---|---|---|---|
| Listing standard for an automatic EFV | ANSI Z21.93 / CSA 6.30 | EFV must be listed to this standard | § 1309.1 |
| Sizing & installation | Manufacturer’s sizing tables, instructions and limits | Must size and install per the manufacturer | § 1309.1 |
| Which services require an EFV | (Not specified in §1309.1) — see referenced standards / utility practice / federal regs | §1309.1 is silent on mandatory installation thresholds | § 1309.1 ; see related referenced standards (Sec. 12‑16‑201) |
| Listed safety shutoffs (general) | Other code sections and appliance/manufacturer requirements may require listed safety shutoffs | §1309.x does not itself impose general listed safety‑shutoff requirements | § 1309.1 (no text on safety shutoffs) |
Where the CRC defers to other documents
- The CRC/Mechanical Code requires the EFV to be listed to ANSI Z21.93/CSA 6.30 — the referenced standards and federal pipeline regulations contain the performance and installation details (for example, ASTM F2138 and federal 49 CFR Part 192 requirements are the typical references used). The California Referenced Standards Code (Standard 12‑16‑2) points to ASTM F2138 and ANSI Z21.93 as certification standards for residential EFVs.
Exceptions & special cases
- § 1309.1 does not list exceptions; it only governs listing and conformity to manufacturer instructions for devices that are installed. If you are asking whether the CRC exempts certain services from EFV requirements, the answer is: the section does not address that. You must consult the referenced standards, federal pipeline rules (49 CFR), and any utility or local ordinance for when an EFV is required.
- For residential certification specifics (what test standard qualifies a device as acceptable in California), see the California Referenced Standards Code (Standard 12‑16‑2) calling out ASTM F2138 and ANSI Z21.93/CSA 6.30.
Common mistakes
- Mistake: Treating § 1309.1 as the rule that tells you when to install EFVs. It does not — it only tells you what an installed EFV must be (listed) and how it must be installed (per the manufacturer).
- Mistake: Installing an “unlisted” EFV or altering an EFV so it no longer matches the manufacturer’s sizing/installation instructions. That violates § 1309.1.
- Operational mistake: Purging or pressurizing a service too rapidly during installation/testing and unintentionally tripping an EFV — manufacturers and utility guidance warn about slow pressurization/purging to avoid nuisance trips. Utility practice (example: PG&E guidance) documents specific purge/pressurization cautions.
- Mistake: Confusing “listed safety shutoff” requirements with EFV requirements. Safety shutoffs are required by other appliance or equipment sections for certain appliances (e.g., burners, boilers) — they are not established by § 1309.1. See the other Mechanical Code sections that address safety shutoff valves for specific equipment.
Worked example — concrete scenario
Scenario: You are installing a new 1‑inch residential gas service and the contractor wants to include an automatic excess‑flow valve.
- Check the code requirement: § 1309.1 requires that any automatic EFV you install be listed to ANSI Z21.93/CSA 6.30 and be sized and installed per the manufacturer’s instructions.
- Practical steps to comply:
- Select a residential EFV with a manufacturer listing to ANSI Z21.93/CSA 6.30 (confirm the listing on the product data). (Refer to § 1309.1.)
- Use the manufacturer’s sizing table for the 1‑inch service (do not invent trip settings or flow capacities). Install orientation, strap/tie‑in, and burial practices must follow the manufacturer’s instructions. (This is the sizing/installation obligation in § 1309.1.)
- If you need to know whether an EFV is required for that service (for example by meter capacity, pressure, or local utility rule), consult the referenced standards, utility rules, or federal pipeline regulations (the CRC text itself does not prescribe the threshold). Utility design standards commonly specify thresholds and placement (see PG&E guidance for an example of operational thresholds and installation guidance).
Result: Installing that EFV meets CRC §1309.1 if the valve is listed to ANSI Z21.93/CSA 6.30 and installed exactly as the manufacturer directs. Whether you were required to install one in the first place is a separate determination outside §1309.1.
Related provisions
- § 1309.1 — Excess‑flow valve general requirement (listing & manufacturer instructions).
- § 1308.11 — Low‑pressure protection (related protective devices).
- § 1308.12 — Shutoff valves (selection and listing requirements for small sizes).
- § 1310.1 — Piping underground (installation context for service piping).
- California Referenced Standards Code — Sec. 12‑16‑201 / Standard 12‑16‑2 (California standard for residential excess‑flow valves; references ASTM F2138 and ANSI Z21.93/CSA 6.30).
- Manufacturer, appliance, and utility rules and federal pipeline rules (49 CFR Part 192) commonly provide the operative thresholds, trip settings, and procedural details that § 1309.1 defers to. For practical installation and purging guidance see utility documents such as PG&E’s EFV design/installation guidance.
Code references
Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:
CRC § 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
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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.
CRC § 93.3 High relevance — show source text
A-93.3
Publication Date: 10/20/2021 Effective Date: 01/01/2022 Rev. 9c
Purpose and Scope
This gas design standard (GDS) provides specifications and design information for selecting and installing polyethylene (PE) and steel excess flow valves (EFVs).
1 General Information
1.1. EFVs are manufactured in accordance with American Society for Testing and Materials (ASTM International) F2138, “Standard Specification for Excess Flow Valves for Natural Gas Service,” and ASTM F1802, “Standard Test Method for Performance Testing of Excess Flow Valves.”
1.2. Only personnel qualified as described in GDS D-34, “Qualifications for Joining Polyethylene Pipe,” may install a plastic EFV.
1.3. Only personnel qualified as described in applicable welding procedures may install a steel EFV.
1.4. See Appendix C for an EFV installation and replacement matrix.
1.5. Exceptions to the guidelines listed in this GDS may be granted by Standards Engineering.
2 Applications for EFVs
2.1. Table 1 describes when EFVs must be installed on new, replaced, repaired, altered, and transferred service lines, except as noted in Step 2.2.
A. In certain scenarios an EFV is required only when there is a new complete service line or new stub service. This does not include repairs, alterations, replacements, or stub completions. It is recommended to install an EFV on existing or replaced services or stub completions, where practical (e.g., installing an EFV would not require upsizing the existing service).
Table 1. Required EFV Scenarios
Service Type Total Connected Load in Standard Cubic Feet
per Hour (scfh)Col3 Service Type 0–1400 1401–5000 Single or branched service to single-family
residence(s)1EFV required EFV required Single or branched service to multifamily building(s) 1EFV required EFV required for new service line 2Branched service to single-family residence and
multifamily building1EFV required EFV required for new service line 2Single service to single commercial meter EFV required EFV required for new service line 2Any other service line (single or branched) EFV required for new
service line2EFV required for new service line 2- Step 6.2, “Branched Service Lines” describes appropriate EFV locations on branches.
- Step 2.1.A provides an explanation on what is a new service line.
Printed copies of this document might be out of date. The Technical Information Library (TIL) has the current version.
PG&E Internal Information “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation.
©2021 Pacific Gas and Electric Company. All rights reserved.
Page 1 of 19
Excess Flow Valves A-93.3
Publication Date: 10/20/2021 Effective Date: 01/01/2022 Rev. 9c
2.2. An EFV is not required in the following situations:
CRC § 12-16 High relevance — show source text
12-16-1 ENGINEERING REGULATIONS—QUALITY AND
DESIGN OF THE MATERIALS OF CONSTRUCTION
CALIFORNIA STANDARD FOR EARTHQUAKE-ACTUATED AUTOMATIC GAS SHUTOFF SYSTEMS (SEE CCR TITLE 24, PART 2, CHAPTERS 16 AND 16A, AND CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-1
DIVISION OF THE STATE ARCHITECT
Authority: Sections 19180–19183, Health and Safety Code. Reference: Section 19182, Health and Safety Code.
DIVISION 1—CONSTRUCTION
SCOPE
Sec. 12-16-101. The American Society of Civil Engineers (ASCE) requirements for “Earthquake-Actuated Automatic Gas Shutoff Devices,” ANSI/ASCE/SEI 25-16 (copyright 2016 by ASCE), shall be the applicable standard used by the Division of the State Architect for the certification of these devices.
Sec. 12-16-101.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).
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12-16-2 ENGINEERING REGULATIONS—QUALITY AND
DESIGN OF THE MATERIALS OF CONSTRUCTION
CALIFORNIA STANDARD FOR RESIDENTIAL EXCESS FLOW ACTUATED AUTOMATIC GAS SHUTOFF VALVES (SEE CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-2
DIVISION OF THE STATE ARCHITECT
Authority: Sections 19200–19204, Health and Safety Code. Reference: Sections 19201.5 and 19202, Health and Safety Code.
DIVISION 1—CONSTRUCTION
SCOPE
Sec. 12-16-201. The American Society for Testing and Materials (ASTM) F2138-12(2017) Standard Specification for Excess Flow Valves for Natural Gas Service, and the American National Standards Institute (ANSI) Z21.93-2017/CSA 6.30-2017 Excess Flow Valves for Natural and LP Gas with Pressure up to 5 psig, shall be the applicable standards used by the Division of the State Architect for certification of these devices.
Sec. 12-16-201.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).
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12-31C RADIATION SHIELDING STANDARDS
STANDARD 12-31C-1
DEPARTMENT OF HEALTH SERVICES
CRC § 90.2 Medium relevance — show source text
Compliance Requirement/Regulatory Commitment
NA
References
Plastic Main and Service Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-90 Locating Wire Installation for Direct Burial Plastic Mains and Services . . . . . . . . . . . . . . . . . . . . A-90.2 Approved “Mark and Locate” Instruments, Equipment, Accessories, and Products . . . . . . . . . M-60 Gas Applicant Design Manual
Appendices
NA
Attachments
NA
Revision Notes
Revision 03 has the following changes:
Added Notes for Replacement of Existing Branch Services and for Installation of New Branch Services.
Added Notes for Subdivisions.
Added Exceptions.
Added Method C and D. Reversed order of A and B.
This document is part of Change 66.
Asset Type: Gas Transmission and Distribution Function: Design Document Contact: Gas Design Standard Responsibility List
Page 4 of 4 PG&E Internal Information, SL2 © 2013 Pacific Gas & Electric Company. All Rights Reserved. Prepared by: AAJ7
GAS DESIGN STANDARD
CURB VALVES
A-43.2
Publication Date: 04/15/2020 Effective Date: 07/15/2020 Rev. 5
Purpose and Scope
This gas design standard (GDS) provides requirements and installation instructions for service valves installed in curb areas. Curb valves are to be installed in accordance with Code of Federal Regulations (CFR) Title 49, Transportation, Part 192—Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards, Section (§) 192.385, “Manual service line shut-off valve installation.”
1 Installation Guidelines
1.1. Use an excess flow valve (EFV) instead of, or in addition to, a curb valve, when feasible. See GDS A-93.3, “Excess Flow Valves,” and criteria in Step 1.2 for additional information.
1.2. Use a curb valve on every new or replaced service line when any of the following conditions exist:
A. The total meter capacity exceeds 1000 standard cubic feet per hour, and an EFV is not required and not installed.
(1) Valves meeting the above criteria are critical isolation valves. See Attachment 1, “Installation Guidance” for additional guidance and requirements.
CRC § 4170P-52 Medium relevance — show source text
Utility Procedure TD-4170P-52, “Mechanical Fitting Connections for Polyethylene Pipe (Threaded Compression Transitions)”
- Utility Procedure TD-4170P-53, “Mechanical Fitting Connections for Polyethylene Pipe (Bolt-On Saddle)”
Construction Materials
Heat Fusion Fittings are listed in GDS B-90 and GDS B-90.1.
Electrofusion Fittings are listed in GDS B-90.3.
PE-to-PE mechanical connections are listed in the following standards:
GDS B-90.1
GDS B-91
GDS B-91.1
- Transition fittings are listed in the following standards:
GDS B-54, “Compression Couplings”
GDS B-91
GDS B-91.1
Excess flow valves are listed in GDS A-93.3.
Plastic valves are listed in GDS F-90, “Polyethylene (PE) Valves.”
Prefabricated risers are listed in GDS A-91.
Printed copies of this document might be out of date. The Technical Information Library (TIL) has the current version.
PG&E Internal Information “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation.
©2021 Pacific Gas and Electric Company. All rights reserved.
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GAS DESIGN STANDARD
EXCESS FLOW VALVES
A-93.3
Publication Date: 10/20/2021 Effective Date: 01/01/2022 Rev. 9c
Purpose and Scope
This gas design standard (GDS) provides specifications and design information for selecting and installing polyethylene (PE) and steel excess flow valves (EFVs).
1 General Information
1.1. EFVs are manufactured in accordance with American Society for Testing and Materials (ASTM International) F2138, “Standard Specification for Excess Flow Valves for Natural Gas Service,” and ASTM F1802, “Standard Test Method for Performance Testing of Excess Flow Valves.”
1.2. Only personnel qualified as described in GDS D-34, “Qualifications for Joining Polyethylene Pipe,” may install a plastic EFV.
1.3. Only personnel qualified as described in applicable welding procedures may install a steel EFV.
1.4. See Appendix C for an EFV installation and replacement matrix.
1.5. Exceptions to the guidelines listed in this GDS may be granted by Standards Engineering.
2 Applications for EFVs
2.1. Table 1 describes when EFVs must be installed on new, replaced, repaired, altered, and transferred service lines, except as noted in Step 2.2.
A. In certain scenarios an EFV is required only when there is a new complete service line or new stub service. This does not include repairs, alterations, replacements, or stub completions. It is recommended to install an EFV on existing or replaced services or stub completions, where practical (e.g., installing an EFV would not require upsizing the existing service).
Table 1. Required EFV Scenarios
CRC § 12-16 Medium relevance — show source text
CALIFORNIA STANDARD FOR RESIDENTIAL EXCESS FLOW ACTUATED AUTOMATIC GAS SHUTOFF VALVES (SEE CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-2
DIVISION OF THE STATE ARCHITECT
Authority: Sections 19200–19204, Health and Safety Code. Reference: Sections 19201.5 and 19202, Health and Safety Code.
DIVISION 1—CONSTRUCTION
SCOPE
Sec. 12-16-201. The American Society for Testing and Materials (ASTM) F2138-12(2017) Standard Specification for Excess Flow Valves for Natural Gas Service, and the American National Standards Institute (ANSI) Z21.93-2017/CSA 6.30-2017 Excess Flow Valves for Natural and LP Gas with Pressure up to 5 psig, shall be the applicable standards used by the Division of the State Architect for certification of these devices.
Sec. 12-16-201.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).
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12-31C RADIATION SHIELDING STANDARDS
STANDARD 12-31C-1
DEPARTMENT OF HEALTH SERVICES
Authority: Sections 102, 208 and 25811.
Reference: Sections 102, 208 and 436.5.
ALL HEALING ARTS X-RAY INSTALLATIONS
Sec. 12-31C-101. All radiation shielding barriers in rooms and enclosures housing radiation machines shall comply with the mandatory standards and appendices in Report No. 35, “Dental X-RAY Protection”; Report 49, “Structural Shielding Design and Evaluation for Medical use of X-rays and Gamma Rays of Energies up to 10 MeV”; and Report No. 51, “Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities.” Published by the National Council on Radiation Protection and Measurements, 7910 Woodmont Avenue, Bethesda, Maryland 20814.
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12-71 AIR FILTERS
STANDARD 12-71-1
STATE FIRE MARSHAL
DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS
Sec. 12-71-100.
(a) Test apparatus.
- The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
CRC § 12.7 Medium relevance — show source text
Where mounted on a concrete base, a means shall be provided and installed within [1] / 2 inch (12.7 mm) of the top of the concrete base that will prevent flow from the supply piping in the event that the dispenser is displaced from its mounting. 2. A manual shutoff valve and an excess flow-control check valve shall be located in the liquid line between the pump and the dispenser inlet where the dispensing device is installed at a remote location and is not part of a complete storage and dispensing unit mounted on a common base. 3. An excess flow-control check valve or an emergency shutoff valve shall be installed in or on the dispenser at the point at which the dispenser hose is connected to the liquid piping. 4. A listed automatic-closing type hose nozzle valve with or without a latch-open device shall be provided on island-type dispensers.
2307.6.2 Hoses. Hoses and piping for the dispensing of LP-gas shall be provided with hydrostatic relief valves. The hose length shall not exceed 18 feet (5486 mm). An approved method shall be provided to protect the hose against mechanical damage.
2307.6.3 Emergency breakaway devices. Dispenser hoses shall be equipped with a listed emergency breakaway device designed to retain liquid on both sides of the breakaway point. Where hoses are attached to hose-retrieving mechanisms, the emergency breakaway device shall be located such that the breakaway device activates to protect the dispenser from being displaced.
2307.6.4 Vehicle impact protection. Where installed within 10 feet of vehicle traffic, LP-gas storage containers, pumps and dispensers shall be protected in accordance with Section 2307.5, Item 2.
2307.7 Public fueling of motor vehicles. Self-service LP-gas dispensing systems, including key, code and card lock dispensing systems, shall be limited to the filling of permanently mounted containers providing fuel to the LP-gas powered vehicle.
The requirements for self-service LP-gas dispensing systems shall be in accordance with the following:
The arrangement and operation of the transfer of product into a vehicle shall be in accordance with this section and Chapter 61.
The system shall be provided with an emergency shutoff switch located within 100 feet (30 480 mm) of, but not less than 20 feet (6096 mm) from, dispensers.
The owner of the LP-gas motor fuel-dispensing facility or the owner’s designee shall provide for the safe operation of the system and the training of users.
The dispenser and hose-end valve shall release not more than [1] / 8 fluid ounce (4 cc) of liquid to the atmosphere upon breaking the connection with the fill valve on the vehicle.
Portable fire extinguishers shall be provided in accordance with Section 2305.5.
Warning signs shall be provided in accordance with Section 2305.6.
The area around the dispenser shall be maintained in accordance with Section 2305.7.
2307.8 Overfilling. LP-gas containers shall not be filled with LP-gas in excess of the volume determined using the fixed maximum liquid level gauge installed on the container, the volume determined by the overfilling prevention device installed on the container or the weight determined by the required percentage of the water capacity marked on the container.
SECTION 2308—COMPRESSED NATURAL GAS MOTOR FUEL-DISPENSING FACILITIES
CRC § 6004.2.2.10 Medium relevance — show source text
- Toxic gases—use. Treatment systems are not required for toxic gases supplied by cylinders or portable tanks not exceeding 1,700 pounds (772 kg) water capacity where a gas detection system complying with Section 6004.2.2.10 and listed or approved automatic-closing fail-safe valves are provided. The gas detection system shall have a sensing interval not exceeding 5 minutes. Automatic-closing fail-safe valves shall be located immediately adjacent to cylinder valves and shall close when gas is detected at the permissible exposure limit (PEL) by a gas sensor monitoring the exhaust system at the point of discharge from the gas cabinet, exhausted enclosure, ventilated enclosure or gas room.
6004.2.2.7.1 Design. Treatment systems shall be capable of diluting, adsorbing, absorbing, containing, neutralizing, burning or otherwise processing the contents of the largest single vessel of compressed gas. Where a total containment system is used, the system shall be designed to handle the maximum anticipated pressure of release to the system when it reaches equilibrium.
6004.2.2.7.2 Performance. Treatment systems shall be designed to reduce the maximum allowable discharge concentrations of the gas to one-half immediate by dangerous to life and health (IDLH) at the point of discharge to the atmosphere. Where more than one gas is emitted to the treatment system, the treatment system shall be designed to handle the worstcase release based on the release rate, the quantity and the IDLH for all compressed gases stored or used.
6004.2.2.7.3 Sizing. Treatment systems shall be sized to process the maximum worst-case release of gas based on the maximum flow rate of release from the largest vessel utilized. The entire contents of the largest compressed gas vessel shall be considered.
6004.2.2.7.4 Stationary tanks. Stationary tanks shall be labeled with the maximum rate of release for the compressed gas contained based on valves or fittings that are inserted directly into the tank. Where multiple valves or fittings are provided, the maximum flow rate of release for valves or fittings with the highest flow rate shall be indicated. Where liquefied compressed gases are in contact with valves or fittings, the liquid flow rate shall be utilized for computation purposes. Flow rates indicated on the label shall be converted to cubic feet per minute (cfm/min) (m [3] /s) of gas at normal temperature and pressure (NTP).
6004.2.2.7.5 Portable tanks and cylinders. The maximum flow rate of release for portable tanks and cylinders shall be calculated based on the total release from the cylinder or tank within the time specified in Table 6004.2.2.7.5. Where portable tanks or cylinders are equipped with approved excess flow or reduced flow valves, the worst-case release shall be determined by the maximum achievable flow from the valve as determined by the valve manufacturer or compressed gas supplier. Reduced flow and excess flow valves shall be permanently marked by the valve manufacturer to indicate the maximum design flow rate. Such markings shall indicate the flow rate for air under normal temperature and pressure (NTP).
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HIGHLY TOXIC AND TOXIC MATERIALS
CRC § 3663.4 Medium relevance — show source text
(5) More than 12 500 000 Btu/h (3663.4 kW) per burner inputs. These burners shall comply with the requirements of the appropriate standards listed in Chapter 18 and the following:
(a) One approved manual shutoff valve lever handle.
(b) One approved fuel-oil filter, installed on the supply piping.
(c) Two safety shutoff valves in series, one with proof of closure, with a combined flame failure response and valve closing time not to exceed 2 seconds with strainer directly before the valves.
(d) Programmed electronic flame safeguard including proven low-fire start, manual reset lockout, 100 percent shutoff (both pilot and main burner), and a separately supervised and proven pilot.
Flame-sensing systems utilizing a UV scanner shall prove pilot and interrupt ignition spark prior to main burner valves being energized.
(e) Two controls, one operating and one high limit, activated by temperature or pressure.
(f) Burners relying on mechanical means to provide air for combustion shall have actual proof-of-air interlock device.
(g) Power burners must include proven prepurge of not less than 60 seconds at high-fire damper settings. This prepurge shall occur before every burner cycle, regardless of reason.
(h) Installations with dampered combustion air openings shall prove damper open position before trial for burner ignition.
(i) Vent dampers and flue dampers shall be interlocked to prevent burner ignition unless safely open.
(j) One high oil or liquid fuel-pressure interlock; reset from flame safeguard or manually.
2025 CALIFORNIA MECHANICAL CODE 401
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APPENDIX C
(k) A manual firing cock.
(l) Where hot water or steam, two low water cut-offs.
(m) An atomizing medium proving switch.
(n) A low oil temperature switch for oil or liquid fuel requiring preheating.
(o) A high oil temperature interlock for oil or liquid fuel requiring pre-heating.
(p) A separate firing rate control valve.
(q) The burner oil pump shall automatically not operate or rotate while the alternate fuel is firing.
(r) A pressure-relief valve shall be provided between safety shutoff valves and between pump and safety valves where an integral valve is used with a pump.
(s) A separate relief device is required on each transfer
pump.
(t) One low oil or liquid fuel-pressure interlock, reset from flame safeguard or manually.
(u) Burners with automatic controls, prepurge, proofof-closure, modulation, or postpurge shall not use relays external to the flame safeguard to accomplish these functions.
(6) Shutoff Valve.
(a) Oil or liquid fuel burner installations shall include a non-electric shutoff valve that is held open by a fusible link designed to close at 165°F (74°C), installed near the burner in the same room as the burner. This shall prevent the flow of oil or liquid fuel to the burner through the supply pipe. A check valve is required in the return line if the tank is higher than the burner.
402 2025 CALIFORNIA MECHANICAL CODE
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE
CRC § 1406.2.1.5 Medium relevance — show source text
1406.2.1.5 Emergency Shutoff Valves. Readily accessible manual or automatic remotely activated fail-safe emergency shutoff valves shall be installed on piping and tubing other than waste lines at the following locations:
(1) At branch connections into the fabrication area.
(2) At entries into exit corridors. Excess flow valves shall be installed as required by the fire code.
1406.2.1.6 Electrical Wiring. Electrical wiring and equipment located in the piping space shall be approved for Class I, Division 2, Hazardous Locations.
Exception: Occasional transverse crossing of the corridors by supply piping that is enclosed within the corridor need not comply with Section 1406.2.1.1 through Section 1406.2.1.6.
1406.3 Special Requirements for HPP Gases. In addition to other requirements of this section, HPP gases shall comply with this subsection and the fire code.
1406.3.1 Special Provisions. Where HPP supply gas is carried in pressurized piping, a fail-safe system shall shut off flow due to a rupture in the piping. Where the piping originates from outside the building, the valve shall be located outside the building as close to the bulk source as practical.
1406.3.2 Piping and Tubing Installation. Piping and tubing shall be installed in accordance with approved standards. Supply piping for hazardous production materials having a health hazard ranking of 3 or 4 shall have welded connections throughout, unless an exhausted enclosure is provided.
Exception: Material that is incompatible with ferrous piping shall be permitted to be installed in nonmetallic piping with approved connections.
1406.3.3 Gas-Detection System. Where hazardous production material gas is used or dispensed and the physiological warning properties of the gas are at a higher level than the accepted permissible exposure limit (PEL) of the gas, a continuous gas-monitoring system shall be provided to detect the presence of the short-term hazard condition. Where dispensing occurs and flammable gases or vapors are capable of being present in quantities in excess of 25 percent of the lower explosive limit (LEL), a continuous gas-monitoring system shall be connected to the emergency control station. The maximum permitted time-weighted average exposures to be utilized shall be as published in 29 CFR 1910.1000.
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CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE
CHAPTER 15 – SOLAR ENERGY SYSTEMS
(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
|Adopting Agency
Adopt Entire Chapter
Adopt Entire Chapter as
amended (amended sections
listed below)
Adopt only those sections
that are listed below
Chapter/Section
1502.CRC § 43.2 Medium relevance — show source text
- This document is part of Change 66.
Asset Type: Gas Transmission and Distribution Function: Design Document Contact: Gas Design Standard Responsibility List
Page 4 of 4 PG&E Internal Information, SL2 © 2013 Pacific Gas & Electric Company. All Rights Reserved. Prepared by: AAJ7
GAS DESIGN STANDARD
CURB VALVES
A-43.2
Publication Date: 04/15/2020 Effective Date: 07/15/2020 Rev. 5
Purpose and Scope
This gas design standard (GDS) provides requirements and installation instructions for service valves installed in curb areas. Curb valves are to be installed in accordance with Code of Federal Regulations (CFR) Title 49, Transportation, Part 192—Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards, Section (§) 192.385, “Manual service line shut-off valve installation.”
1 Installation Guidelines
1.1. Use an excess flow valve (EFV) instead of, or in addition to, a curb valve, when feasible. See GDS A-93.3, “Excess Flow Valves,” and criteria in Step 1.2 for additional information.
1.2. Use a curb valve on every new or replaced service line when any of the following conditions exist:
A. The total meter capacity exceeds 1000 standard cubic feet per hour, and an EFV is not required and not installed.
(1) Valves meeting the above criteria are critical isolation valves. See Attachment 1, “Installation Guidance” for additional guidance and requirements.
B. The service riser valve is not readily accessible or is inside a building, such as where the service shutoff valve is enclosed (e.g., basement, garage, or other type of obstructed location).
C. The service line supplies a building where approximately 100 or more people gather and where the occupancy may be transient. Examples include but are not limited to schools, hospitals, churches, places of incarceration, theaters, and transit centers.
D. The service line cannot be quickly squeezed off due to wall-to-wall paving, concrete, depth of cover, or other surface conditions and an EFV is not required and not installed. This includes known planned depth of cover or other surface conditions. Typically, a service line that is installed in a lawn area with normal soil conditions (e.g., no wall-to-wall paving, concrete, or other obstruction over the service line) may be quickly squeezed off.
1.3. Install curb valve at least 5 feet from any building, as close to the property line and gas main as practical, and in a location that should minimize the chances the valve will be paved over, or access obstructed.
1.4. Install valves using components listed in Table 1.
A. Follow all instructions shown in GDS A-90.2, “Locating Wire Installation for Plastic Mains and Services.”
PG&E Internal Information “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation.
©2020 Pacific Gas and Electric Company. All rights reserved.
Page 1 of 4
Curb Valves A-43.2
Publication Date: 04/15/2020 Effective Date: 07/15/2020 Rev. 5
1.4 (continued)
CRC § 93.3 Medium relevance — show source text
Printed copies of this document might be out of date. The Technical Information Library (TIL) has the current version.
Page 12 of 19 “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation.
©2021 Pacific Gas and Electric Company. All rights reserved.
PG&E Internal Information
Excess Flow Valves A-93.3
Publication Date: 10/20/2021 Effective Date: 01/01/2022 Rev. 9c
Target Audience
Gas distribution engineering and estimating personnel, maintenance and construction personnel, general construction personnel, contractors, applicant designers, and inspectors.
Definitions
Branch service line A gas service line that is not directly connected to a gas main but has another service line as its source of supply.
Farm tap regulator set A pressure regulator set, including both single and multiple stages of pressure regulation, that controls pressure to a service line.
Nominal operating pressure (NOP)
The operating pressure of a system that is generally the set point of the working regulator.
Total connected load Total demand of all gas appliances operating simultaneously and at full capacity.
Compliance Requirement / Regulatory Commitment
Code of Federal Regulations (CFR) Title 49, Transportation, Part 192—Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards, Section 192.381, “Service lines: Excess flow valve performance standards.”
Code of Federal Regulations (CFR) Title 49, Transportation, Part 192—Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards, Section 192.383, “Excess flow valve installation.”
Records and Information Management:
Information or records generated by this procedure must be managed in accordance with the Enterprise Records and Information (ERIM) Policy, Standards and Enterprise Records Retention Schedule (ERRS). Refer to GOV-7101S, “Enterprise Records and Information Management Standard,” and related standards. Management of records includes, but is not limited to:
Integrity
Storage
Retention and Disposition
Classification and Protection
Printed copies of this document might be out of date. The Technical Information Library (TIL) has the current version.
PG&E Internal Information “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation.
©2021 Pacific Gas and Electric Company. All rights reserved.
Page 13 of 19
Excess Flow Valves A-93.3
Publication Date: 10/20/2021 Effective Date: 01/01/2022 Rev. 9c
References
American Society for Testing and Materials (ASTM International) A53, “Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless”
American Society for Testing and Materials (ASTM International) F1802, “Standard Test Method for Performance Testing of Excess Flow Valves”
American Society for Testing and Materials (ASTM International) F2138, “Standard Specification for Excess Flow Valves for Natural Gas Service”
Gas Design Standard A-34, “Piping Test Design Requirements”
Gas Design Standard A-38, “Purging Gas Facilities”
Gas Design Standard A-42, “Standard Branch Service Installation”
Gas Design Standard A-43.2, “Curb Valves”
Gas Design Standard D-34, “Qualifications for Joining Polyethylene Pipe”
Gas Design Standard H-10, “High-Pressure Regulator-Type Stations and Farm Tap Regulator Sets”
Frequently asked questions
When does § 1309.1 require an EFV to be installed?
It does not mandate when an EFV must be installed; it prescribes the requirements that apply when an automatic EFV is installed (listed to ANSI Z21.93/CSA 6.30 and installed/sized per manufacturer).
If a valve is not "listed," can it be used if the manufacturer provides data?
No — § 1309.1 requires the device be listed to the stated standard. Manufacturer data alone does not substitute for an appropriate listing.
Where do I find the numeric trip/flow values for an EFV?
Those performance values are in the listed device’s certification and the referenced standards (e.g., ASTM F2138, ANSI Z21.93) and in manufacturer sizing tables — not spelled out in § 1309.1. See Standard 12‑16‑2 for the California referencing of those standards.
Are “listed safety shutoffs” covered by § 1309.1?
No. § 1309.1 addresses excess‑flow valves only. Safety shutoffs for appliances and burners are required elsewhere in the Mechanical Code or appliance standards. Check the appliance or equipment section that applies to the installation.
Practical caution during installation/testing?
When leak‑testing or purging a service with an EFV, pressurize and purge slowly to avoid tripping the valve; utility guidance documents provide step‑by‑step cautions.
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