CRC · California Residential Code
Low-pressure protection and appliance shutoff valve requirements
If an appliance can pull down or dangerously reduce pressure at the gas meter, the CRC requires a protective device between the meter and that appliance (see **§ 1308.11**). Appliance shutoff valves must be selected to the pressure class and standards shown in **Table 1308.12**, and valves 1 inch NPT and smaller must be listed and labeled (see **§ 1308.12**).
Last reviewed: July 6, 2026
What the code requires — plain English
A protective device must be installed between the gas meter and the appliance when the appliance’s operation could create a vacuum or a dangerous reduction in gas pressure at the meter — common devices are mechanical, diaphragm‑operated, or electrically operated low‑pressure shutoff valves (§ 1308.11). Appliance shutoff valves must be selected to the standards and pressure ratings shown in Table 1308.12; valves 1 inch (25 mm) NPT and smaller used on appliances must be listed and labeled and outdoor use must follow the manufacturer’s recommendations (§ 1308.12).
The key rule: if an appliance can pull down or dangerously reduce pressure at the meter, install a low‑pressure protective device between the meter and that appliance (see § 1308.11).
Requirements in detail
Low‑pressure protection (what triggers the requirement)
- Trigger: any appliance or equipment whose operation "could produce a vacuum or a dangerous reduction in gas pressure at the meter." The Code requires a protective device between the meter and the appliance when that condition exists (§ 1308.11).
- Acceptable device types (non‑exclusive list): mechanical, diaphragm‑operated, or electrically operated low‑pressure shutoff valves. The section explicitly lists these as examples (not an exhaustive list) (§ 1308.11).
Appliance shutoff valve selection and listing
- Selection: shutoff valves must be selected in accordance with Table 1308.12. The Table ties application (e.g., appliance shutoff) to allowable pressure rating and the applicable standards for the valve (§ 1308.12).
- Listing/labeling: Shutoff valves of size 1 inch (25 mm) NPT and smaller shall be listed and labeled. Outdoor use must follow the manufacturer’s recommendation (§ 1308.12).
Decision table — which valve / rating / standard to use
| Decision dimension | Typical values / thresholds | Code reference |
|---|---|---|
| When a protective device is required | If appliance operation can produce a vacuum or dangerous pressure reduction at the meter | § 1308.11 |
| Acceptable low‑pressure protective devices | Mechanical, diaphragm‑operated, or electrically operated low‑pressure shutoff valves (examples only) | § 1308.11 |
| Valve listing requirement for appliance connections | 1 inch (25 mm) NPT and smaller — must be listed and labeled | § 1308.12 |
| Valve pressure ratings found in the Table | up to 1/2 psi, up to 2 psi, up to 5 psi, up to 125 psi (Table entries) | Table 1308.12 / § 1308.12 |
| Standards for valves by pressure rating | Examples: CSA/ANSI Z21.15/CSA 9.1, ASME B16.44, ASME B16.33, CSA/ANSI LC 4/CSA 6.32 (as matched in Table 1308.12) | Table 1308.12 / § 1308.12 |
Notes: Table 1308.12 pairs specific valve pressure classes with the recognized standards that valves must meet — consult the Table directly when choosing a valve for a particular pressure rating and application.
Exceptions & special cases
- The text of § 1308.11 provides examples of acceptable protective device types but does not give a numeric threshold for what constitutes a “dangerous reduction in gas pressure” in the portion retrieved. If an authority (AHJ) needs a numeric test/threshold, refer to appliance manufacturer instructions and coordinate with the gas utility or AHJ.
- § 1308.12 requires listing/labeling for valves 1 in. NPT and smaller; it does not remove the Table requirement for larger valves — larger valves must still meet appropriate standards in Table 1308.12.
- Outdoor use: the Code defers to the manufacturer’s recommendation for outdoor installation of listed valves (no blanket prohibition — follow maker’s data) (§ 1308.12).
Common mistakes
- Installing a non‑listed 1 in. (or smaller) appliance shutoff valve. The Code requires listed/labeled valves of that size for appliance connections (§ 1308.12) — don’t substitute an unlisted hardware‑store valve.
- Assuming every appliance needs low‑pressure protection. The requirement is triggered only when appliance operation “could produce a vacuum or a dangerous reduction in gas pressure at the meter” — evaluate the appliance behavior before adding devices (§ 1308.11).
- Picking a valve rated for the wrong pressure class. Use Table 1308.12 to match the valve pressure rating and the required standard (e.g., up to 1/2 psi vs. up to 5 psi) (§ 1308.12).
- Outdoor installation without checking manufacturer guidance. For outdoor use of listed valves, the Code defers to the manufacturer’s recommendation (§ 1308.12).
Worked example
Scenario: A contractor installs a gas appliance whose internal operating cycle can draw gas faster than the supply and could momentarily reduce pressure at the meter (the AHJ determines this could create a hazardous condition). The appliance gas inlet is a 3/4 in. NPT connection.
Steps:
- Because the appliance operation could produce a vacuum or dangerous pressure reduction at the meter, a protective device is required between the meter and appliance per § 1308.11. Choose a low‑pressure shutoff device (mechanical or diaphragm type) that is appropriate for the system.
- The appliance connection is 3/4 in. NPT (≤ 1 in.), so the appliance shutoff valve at the appliance must be listed and labeled. Select an appliance shutoff valve listed to the standard required by Table 1308.12 for the valve’s intended pressure class (for example, if the system uses a regulator and the appliance side pressure class is within 1/2 psi limits, pick a valve listed for up to 1/2 psi such as one meeting CSA/ANSI Z21.15 or ASME B16.44, per Table 1308.12) (§ 1308.12).
- Install the low‑pressure protective device between the meter and the appliance piping so it protects the meter and complies with the manufacturer’s installation and testing instructions; ensure valve listing and outdoor‑use guidance are followed if the valve is outdoors (§ 1308.11; § 1308.12).
Related provisions (use these together with §§ 1308.11 & 1308.12)
- § 1308.9 Overpressure protection devices (construction, testing, capacity and installation requirements) — relevant where pressure control devices are installed.
- § 1308.10 Backpressure protection (protective devices where reverse flow or forced air/gases could be introduced).
- § 1308.8 Pressure limitation requirements (sets limits for overpressure scenarios).
- § 1308.14 Pressure regulator and pressure control venting (venting requirements for regulators and controls).
- § 1310.11 Manual gas shutoff valves (installation rules for manual shutoff valves in buildings).
- § 1312.6 Appliance shutoff valves and connections (details for appliance connections and valves).
Code references
Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:
CRC § 5.8.8.1 High relevance — show source text
** The discharge stacks, vents, or outlet parts of all pressure relieving and pressure limiting devices shall be located so that gas is safely discharged to the outdoors. Discharge stacks or vents shall be designed to prevent the entry of water, insects, or other foreign material that could cause blockage. The discharge stack or vent line shall be at least the same size as the outlet of the pressure relieving device. [NFPA 54:5.8.8.1, 5.8.8.2] 1308.9.7 Size of Fittings, Pipe, and Openings. The fittings, pipe, and openings located between the system to be protected and the pressure relieving device shall be sized to prevent hammering of the valve and to prevent impairment of relief capacity. [NFPA 54:5.8.9] 1308.10 Backpressure Protection. Protective devices shall be installed as close to the equipment as practical where the design of equipment connected is such that air, oxygen, or standby gases could be forced into the gas supply system. Gas and air combustion mixers incorporating double diaphragm “zero” or “atmosphere” governors or regulators shall require no further protection unless connected directly to compressed air or oxygen at pressures of 5 psi (34 kPa) or more. [NFPA 54:5.9.1.1, 5.9.1.2]
1308.10.1 Protective Devices. Protective devices shall include but not be limited to the following:
(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.
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 § 1308.8 High relevance — show source text
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TABLE OF CONTENTS
1308.8 Pressure Limitation
Requirements . . . . . . . . . . . . . . . . 281
1308.9 Overpressure Protection Devices. . . . . . . . . . . . . . . . . . . . . 281
1308.10 Backpressure Protection . . . . . . . 282
1308.11 Low-Pressure Protection . . . . . . . 282
1308.12 Shutoff Valves . . . . . . . . . . . . . . . 282
Table 1308.12 Manual Gas Valve Standards. . . . 282
1308.13 Expansion and Flexibility . . . . . . . 282
1308.14 Pressure Regulator and Pressure Control Venting . . . . . . . 282
1309.0 Excess Flow Valve . . . . . . . . . . . . 283
1309.1 General. . . . . . . . . . . . . . . . . . . . . 283
1310.0 Gas Piping Installation . . . . . . . . . 283
1310.1 Piping Underground . . . . . . . . . . . 283
1310.2 CSST Piping Systems . . . . . . . . . 284
1310.3 Installation of Aboveground Piping . . . . . . . . . . . . . . . . . . . . . . 284
Table 1310.3.5.1 Support of Piping . . . . . . . . . . . . . 285
1310.4 Concealed Piping in Buildings . . . 285
1310.5 Piping in Vertical Chases . . . . . . . 286
1310.6 Maximum Operating Pressure in Buildings . . . . . . . . . . . . . . . . . . 286
1310.7 Appliance Overpressure Protection . . . . . . . . . . . . . . . . . . . 286
1310.8 Gas Pipe Turns. . . . . . . . . . . . . . . 286
1310.9 Drips and Sediment Traps . . . . . . 287
1310.10 Outlets . . . . . . . . . . . . . . . . . . . . . 287
1310.11 Manual Gas Shutoff Valves . . . . . 287
1310.12 Prohibited Devices . . . . . . . . . . . . 288
1310.13 Systems Containing Gas-Air Mixtures Outside the Flammable
Range . . . . . . . . . . . . . . . . . . . . . . 288
1310.14 Systems Containing Flammable Gas-Air Mixtures. . . . . . . . . . . . . . 288
1311.0 Electrical Bonding and Grounding. . . . . . . . . . . . . . . . . . . 289
1311.1 Pipe and Tubing other than CSST . . . . . . . . . . . . . . . . . . . . . . 289
1311.2 Bonding of CSST Gas Piping . . . . 289
1311.3 Arc-Resistant Jacketed CSST . . . 289
CRC § 5.9.1.1 High relevance — show source text
Gas and air combustion mixers incorporating double diaphragm “zero” or “atmosphere” governors or regulators shall require no further protection unless connected directly to compressed air or oxygen at pressures of 5 psi (34 kPa) or more. [NFPA 54:5.9.1.1 – 5.9.1.2]
1208.11.1 Protective Devices. Protective devices
shall include but not be limited to the following:
(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]
1208.12 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]
1208.13 Shutoff Valves. Shutoff valves shall be selected in
accordance with Table 1208.13. 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]
1208.14 Expansion and Flexibility. Piping systems shall be designed to prevent failure from thermal expansion or contraction. [NFPA 54:5.13.1]
1208.14.1 Special Local Conditions. Where local conditions include earthquake, tornado, unstable ground, or flood hazards, special consideration shall be given to increased strength and flexibility of piping supports and connections. [NFPA 54:5.13.2]
1208.15 Pressure Regulator and Pressure Control Venting. The venting of the atmospheric side of diaphragms in line pressure regulators, gas appliance regulators, and gas pressure limit controls shall be in accordance with all of the following:
(1) An independent vent pipe to the outdoors, sized in accordance with the device manufacturer’s instructions, shall be provided where the location of a device is such that a discharge of fuel gas will cause a hazard. For devices other than appliance regulators, vents are not required to be independent where the vents are connected to a common manifold designed in accordance with engineering methods to minimize backpressure in the event of diaphragm failure and such design is approved.
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.
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222 2025 CALIFORNIA PLUMBING CODE
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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.
CRC § 1208.10.1 High relevance — show source text
1208.10.1 Overpressure Protection Required. Where piping systems serving appliances designed to operate with a gas supply pressure greater than 14 inches water column (3.5 kPa) are required to be equipped with overpressure protection by Section 1208.8, each overpressure protection device shall be adjusted to limit the gas pressure to each connected appliance as required by the appliance manufacturer’s installation instructions. [NFPA 54:5.8.2.2]
1208.10.2 Overpressure Protection Devices. Each overpressure protection device installed to meet the requirements of this section shall be capable of limiting the pressure to its connected appliance(s) as required by this section independently of any other pressure control equipment in the piping system. [NFPA 54:5.8.2.3] 1208.10.3 Detection of Failure. Each gas piping system for which an overpressure protection device is required by this section shall be designed and installed so that a failure of the primary pressure control device(s) is detectable. [NFPA 54:5.8.2.4] 1208.10.4 Flow Capacity. If a pressure relief valve is used to meet the requirements of this section, it shall have a flow capacity such that the pressure in the protected system is maintained at or below the limits specified in Section 1208.10 under the following conditions:
(1) The line pressure regulator for which the relief valve is providing overpressure protection has failed wide
open.
(2) The gas pressure at the inlet of the line pressure regulator for which the relief valve is providing overpressure protection is not less than the regulator’s normal operating inlet pressure. [NFPA 54:5.8.2.5]
1208.11 Backpressure Protection. Protective devices shall be installed as close to the equipment as practical where the design of equipment connected is such that air, oxygen, or standby gases could be forced into the gas supply system.
Gas and air combustion mixers incorporating double diaphragm “zero” or “atmosphere” governors or regulators shall require no further protection unless connected directly to compressed air or oxygen at pressures of 5 psi (34 kPa) or more. [NFPA 54:5.9.1.1 – 5.9.1.2]
1208.11.1 Protective Devices. Protective devices
shall include but not be limited to the following:
(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]
1208.12 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]
1208.13 Shutoff Valves. Shutoff valves shall be selected in
accordance with Table 1208.13. 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]
CRC § 1308.8 Medium relevance — show source text
1308.8 Pressure Limitation Requirements. Where piping systems serving appliances designed to operate with a gas supply pressure of 14 inches water column (3.5 kPa) or less are required to be equipped with overpressure protection by Section 1308.7, each overpressure protection device shall be adjusted to limit the gas pressure to each connected appliance to 2 psi (14 kPa) or less upon a failure of the line pressure regulator. [NFPA 54:5.8.2.1]
1308.8.1 Overpressure Protection Required. Where piping systems serving appliances designed to operate with a gas supply pressure greater than 14 inches water column (3.5 kPa) are required to be equipped with overpressure protection by Section 1308.7, each overpressure protection device shall be adjusted to limit the gas pressure to each connected appliance as required by the appliance manufacturer’s installation instructions. [NFPA 54:5.8.2.2]
1308.8.2 Overpressure Protection Devices. Each overpressure protection device installed to meet the requirements of this section shall be capable of limiting the pressure to its connected appliance(s) as required by this section independently of any other pressure control equipment in the piping system. [NFPA 54:5.8.2.3]
1308.8.3 Detection of Failure. Each gas piping system for which an overpressure protection device is required by this section shall be designed and installed so that a failure of the primary pressure control device(s) is detectable. [NFPA 54:5.8.2.4]
1308.8.4 Flow Capacity. If a pressure relief valve is used to meet the requirements of this section, it shall
have a flow capacity such that the pressure in the protected system is maintained at or below the limits specified in Section 1308.8 under the following conditions:
(1) The line pressure regulator for which the relief valve is providing overpressure protection has failed wide
open.
(2) The gas pressure at the inlet of the line pressure regulator for which the relief valve is providing overpressure protection is not less than the regulator’s normal operating inlet pressure. [NFPA 54:5.8.2.5]
1308.9 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 1308.8 or less.
(4) Automatic shutoff device installed in series with the line pressure regulator and set to shut off when the pressure on the downstream piping system reaches the maximum values specified by Section 1308.8 or less. This device shall be designed so that it will remain closed until manually reset. [NFPA 54:5.8.3.1]
1308.9.1 Separate Devices. The devices in Section 1308.9 shall be installed either as an integral part of the service or line pressure regulator or as separate units. Where separate overpressure protection devices are installed, they shall comply with Section 1308.9.2 through Section 1308.9.7. [NFPA 54:5.8.3.2]
1308.9.2 Construction and Installation. All overpressure protection devices shall meet the following requirements:
California Residential Code Medium relevance — show source text
USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE**|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE| ||TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3| |FLOW DESIGNATION:|13|15|18|19|23|25|30|31|37|39|46|48|60|62| |LENGTH (feet)|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR|CAPACITY IN THOUSANDS OF BTU PER HOUR| |5
10
15
20|72
50
39
34|99
69
55
49|181
129
104
91|211
150
121
106|355
25CRC § 1306.1 Medium relevance — show source text
1306.1 Disconnection . . . . . . . . . . . . . . . . 276
1306.2 Notice . . . . . . . . . . . . . . . . . . . . . . 276
1306.3 Capped Outlets. . . . . . . . . . . . . . . 276
1307.0 Temporary Use of Gas . . . . . . . . . 276
1307.1 General. . . . . . . . . . . . . . . . . . . . . 276
1308.0 Gas Piping System Design, Materials, and Components . . . . . 276
1308.1 Installation of Piping System . . . . 276
1308.2 Interconnections Supplying Separate Users. . . . . . . . . . . . . . . 276
1308.3 Sizing of Gas Piping Systems . . . 277
1308.4 Acceptable Piping Materials and Joining Methods . . . . . . . . . . 277
Table 1308.3.1 Approximate Gas Input for Typical Appliances . . . . . . . . . . . . 277
Table 1308.4.6.2 Specifications for Threading Metallic Pipe . . . . . . . . . . . . . . . . . 278
1308.5 Gas Meters . . . . . . . . . . . . . . . . . . 280
1308.6 Gas Pressure Regulators . . . . . . . 280
1308.7 Overpressure Protection. . . . . . . . 281
2025 CALIFORNIA MECHANICAL CODE
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TABLE OF CONTENTS
1308.8 Pressure Limitation
Requirements . . . . . . . . . . . . . . . . 281
1308.9 Overpressure Protection Devices. . . . . . . . . . . . . . . . . . . . . 281
1308.10 Backpressure Protection . . . . . . . 282
1308.11 Low-Pressure Protection . . . . . . . 282
1308.12 Shutoff Valves . . . . . . . . . . . . . . . 282
Table 1308.12 Manual Gas Valve Standards. . . . 282
1308.13 Expansion and Flexibility . . . . . . . 282
1308.14 Pressure Regulator and Pressure Control Venting . . . . . . . 282
1309.0 Excess Flow Valve . . . . . . . . . . . . 283
1309.1 General. . . . . . . . . . . . . . . . . . . . . 283
1310.0 Gas Piping Installation . . . . . . . . . 283
1310.1 Piping Underground . . . . . . . . . . . 283
1310.2 CSST Piping Systems . . . . . . . . . 284
1310.3 Installation of Aboveground Piping . . . . . . . . . . . . . . . . . . . . . . 284
Table 1310.3.5.1 Support of Piping . . . . . . . . . . . . . 285
CRC § 1205.1 Medium relevance — show source text
1205.1 Authorized Personnel . . . . . . . . . .216
1205.2 Outlets . . . . . . . . . . . . . . . . . . . . .216
1206.0 Authority to Disconnect . . . . . . . .216
1206.1 Disconnection . . . . . . . . . . . . . . . .216
1206.2 Notice . . . . . . . . . . . . . . . . . . . . . .216
1206.3 Capped Outlets . . . . . . . . . . . . . . .216
1207.0 Temporary Use of Gas . . . . . . . . .216
1207.1 General . . . . . . . . . . . . . . . . . . . . .216
1208.0 Gas Piping System Design, Materials, and Components . . . . .216
1208.1 Installation of Piping System . . . .216
1208.2 Interconnections Supplying Separate Users . . . . . . . . . . . . . . .216
1208.3 Sizing of Gas Piping Systems . . .216
Table 1208.3.1 Approximate Gas Input for Typical Appliances . . . . . . . . . . . .217
1208.4 Maximum Operating Pressure in Buildings . . . . . . . . . . . . . . . . . .217
1208.5 Acceptable Piping Materials and Joining Methods . . . . . . . . . .217
Table 1208.5.8.2 Specifications for Threading Metallic Pipe . . . . . . . . . . . . . . . . .219
1208.6 Gas Meters . . . . . . . . . . . . . . . . . .220
1208.7 Gas Pressure Regulators . . . . . . .221
1208.8 Overpressure Protection Required . . . . . . . . . . . . . . . . . . . .221
1208.9 Overpressure Protection Devices . . . . . . . . . . . . . . . . . . . . .221
1208.10 Pressure Limitation
Requirements . . . . . . . . . . . . . . . .222
1208.11 Backpressure Protection . . . . . . .222
1208.12 Low-Pressure Protection . . . . . . .222
1208.13 Shutoff Valves . . . . . . . . . . . . . . .222
1208.14 Expansion and Flexibility . . . . . . .222
1208.15 Pressure Regulator and Pressure Control Venting . . . . . . .222
Table 1208.13 Manual Gas Valve Standards . . . .223
1209.0 Excess Flow Valve . . . . . . . . . . . .223
1209.1 General . . . . . . . . . . . . . . . . . . . . .223
1210.0 Gas Piping Installation . . . . . . . . .223
1210.1 Piping Underground . . . . . . . . . . .223
1210.2 CSST Piping Systems . . . . . . . . .225
1210.3 Installation of Aboveground Piping . . . . . . . . . . . . . . . . . . . . . .225
CRC § 0.5 Medium relevance — show source text
**| ||||||||||PRESSURE DROP:|PRESSURE DROP:|PRESSURE DROP:|0.5 in. w.c.|0.5 in. w.c.|0.5 in. w.c.| ||||||||||SPECIFIC GRAVITY:|SPECIFIC GRAVITY:|SPECIFIC GRAVITY:|1.50|1.50|1.50| |INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE|INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE| ||TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3|TUBE SIZE (EHD)3| |**FLOW
Frequently asked questions
Do I always need a low‑pressure shutoff valve when I add a new gas appliance?
Not always. You need one only if the appliance’s operation could create a vacuum or dangerous reduction in gas pressure at the meter. That triggering condition, not simply adding an appliance, is what § 1308.11 requires.
What types of devices satisfy low‑pressure protection?
§ 1308.11 lists mechanical, diaphragm‑operated, and electrically operated low‑pressure shutoff valves as acceptable examples; the list is illustrative, not exhaustive. Confirm device suitability with manufacturer data and the AHJ.
Must the appliance shutoff valve be listed?
Yes. Shutoff valves of size 1 inch NPT and smaller must be listed and labeled. Also select the valve per Table 1308.12 to match the pressure rating and standard required by the application (§ 1308.12).
Where do I find which standard a valve must meet?
Match the valve application and pressure class to Table 1308.12; the Table lists acceptable standards (CSA/ANSI, ASME B16.44, ASME B16.33, etc.) for each pressure rating per § 1308.12.
Can I install a generic outdoor valve on an exterior appliance connection?
No — for outdoor installations, follow the valve manufacturer’s recommendations; also remember valves 1 in. NPT and smaller must be listed and labeled per § 1308.12.
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