CRC · California Residential Code
How to size residential fuel-gas piping systems
You must size gas piping to serve the sum of all appliances’ maximum inputs (use Table 1208.3.1 or manufacturer data), choose an approved sizing method (chapter tables, listed manufacturer tables, or engineering), and verify the pressure drop so each appliance’s inlet pressure meets the appliance minimum; see **§ 1208.3.2**, **§ 1208.3.3**, and **Table 1208.3.1** for the controlling rules.
Last reviewed: July 6, 2026
What the code requires — 2–4 sentences
You must size fuel‑gas piping so the system can supply the sum of the maximum inputs of the appliances served and deliver gas to each appliance inlet at no less than the minimum supply pressure required by the appliance. The code allows three permitted sizing approaches (tables/equations in the chapter, listed manufacturer tables, or engineering methods) under § 1208.3.2. The design must also control the allowable pressure drop so appliance inlet pressures meet appliance requirements (see § 1208.3.3).
Size piping to meet the total maximum appliance demand and make sure the pressure at every appliance inlet is at or above the appliance’s minimum required pressure. (Plain‑English restatement of the code requirement.)
Requirements in detail
1) Permitted sizing methods
- You may size piping by:
- Pipe sizing tables or sizing equations in this chapter,
- Sizing tables included in a listed piping system manufacturer’s installation instructions, or
- Engineering methods acceptable to the Authority Having Jurisdiction.
This list of allowed methods is in § 1208.3.2.
| Decision step | What the code allows | Code Reference |
|---|---|---|
| Choose a sizing method | Chapter pipe tables/equations, manufacturer's listed tables, or engineering design | § 1208.3.2 |
2) Calculate maximum gas demand (what you size for)
- Use the sum of the maximum input ratings of all appliances served as the basis for sizing. If appliance input ratings are not indicated, use ratings from the appliance manufacturer, the gas supplier, or Table 1208.3.1 (the standard “approximate gas input for typical appliances”) to estimate demand. Adjust volumetric flow for altitude above 2,000 ft (610 m). The rules on maximum gas demand and use of the table are in § 1208.3.1 and the table heading.
| Typical appliance (examples from Table 1208.3.1) | Typical input (Btu/hr, from Table 1208.3.1) | Use for demand calc | Code Reference |
|---|---|---|---|
| Domestic range, freestanding | 65,000 Btu/hr (typical entry) | Convert to volumetric flow (Btu ÷ gas heating value) | Table 1208.3.1 |
| Built‑in oven | 25,000 Btu/hr (typical entry) | — | Table 1208.3.1 |
| Water heater (storage) | 35,000 Btu/hr (example entry) | — | Table 1208.3.1 |
| Clothes dryer (domestic) | 35,000 Btu/hr (example entry) | — | Table 1208.3.1 |
| Gas fireplace / logs / BBQ | (entries vary; see table) | — | Table 1208.3.1 |
Notes:
- To convert Btu/hr to cubic feet per hour (standard practice in the code examples) divide Btu/hr by the heating value per cubic foot for the local gas (the example in the code used 1,100 Btu/ft³). See the example solution in the code for the conversion approach.
3) Allowable pressure drop / final verification
- The design pressure loss from the point of delivery to the appliance inlet must be controlled so that the supply pressure at each appliance inlet is ≥ the appliance minimum required pressure. This allowable pressure‑drop requirement is stated in § 1208.3.3. Use the pressure limits and pressure‑drop guidance in the applicable sizing tables/equations or engineering calculation.
4) Where engineering methods are used
- When you use engineering calculations (the code permits this), ensure the design is accepted by the Authority Having Jurisdiction and that the calculated pressure drop meets the requirement of § 1208.3.3. § 1208.3.2 authorizes engineering methods as one permitted approach.
Exceptions & special cases
- If appliance input ratings are unknown, the code permits using Table 1208.3.1 as an estimating reference instead of manufacturer data. Table 1208.3.1 is explicitly referenced in the chapter for this purpose.
- Altitude adjustment: volumetric flow rate must be adjusted for installations above 2,000 ft (610 m) — the requirement to adjust for altitude is stated in the maximum demand provision.
- If the system or supply pressure is outside the range covered by the chapter tables (for example, higher supply pressures or long runs beyond table limits), the code directs use of engineering methods and approval by the Authority Having Jurisdiction. § 1208.3.2 covers the allowance for engineering methods.
Common mistakes
- Treating the piping demand as current appliance use or “typical” rather than the sum of maximum inputs (the code assumes simultaneous full demand unless approved diversity factors are used). See § 1208.3.1.
- Forgetting to adjust for altitude above 2,000 ft, which increases volumetric flow requirements.
- Selecting pipe sizes without checking the allowable pressure drop (final pressure at each appliance inlet), required by § 1208.3.3. This is commonly overlooked.
- Using manufacturer sizing tables that are not “listed” or not consistent with the chapter—only listed manufacturer instructions are explicitly allowed as an alternative sizing source under § 1208.3.2.
- Assuming the chapter’s appliance input table (Table 1208.3.1) gives volumetric flow directly without converting from Btu/hr using local gas heating value when necessary. The code example demonstrates dividing Btu/hr by the gas heating value (example used 1,100 Btu/ft³) to get cubic feet/hour.
Worked example — concrete scenario (how to apply the rules)
Scenario: Small single‑family dwelling with the following appliances (nameplate or typical inputs):
- Gas range — 65,000 Btu/hr (Table 1208.3.1)
- Water heater — 35,000 Btu/hr (Table 1208.3.1)
- Furnace — 40,000 Btu/hr (manufacturer rating)
- Clothes dryer — 35,000 Btu/hr (Table 1208.3.1)
Steps (code‑based):
- Determine maximum input (sum): 65,000 + 35,000 + 40,000 + 35,000 = 175,000 Btu/hr. Use Table 1208.3.1 and manufacturer data as needed.
- Convert to volumetric requirement using local gas heating value. The code example uses 1,100 Btu/ft³ as an illustration:
175,000 Btu/hr ÷ 1,100 Btu/ft³ = 159 ft³/hr (standard cubic feet per hour). (Use actual local heating value supplied by the gas utility if known.) - Choose your allowed sizing method per § 1208.3.2: (a) read the pipe sizing tables in the chapter (or in Chapter 12xx pipe tables such as the sample tables used by the code), (b) use a listed manufacturer’s sizing table, or (c) perform an engineering calculation. § 1208.3.2 permits these options.
- Using the selected pipe sizing table or engineering calculation, look up the pipe size for the run length from the point of delivery to the most remote outlet and the computed volumetric demand. (The code shows examples that use the appliance input table plus the chapter’s pipe sizing tables; see the example solution in the code.) If you must use engineering methods because runs or loads fall outside tabulated ranges, document the calculations and obtain AHJ approval.
- Verify the allowable pressure drop: confirm the pressure drop between the point of delivery and each appliance inlet results in inlet pressures that are equal to or greater than the appliance minimum required pressure as required by § 1208.3.3. If not, upsize pipe or provide appropriate regulators.
Note: The code’s pipe sizing tables (used in step 4) are in the chapter’s sizing tables (e.g., the tables in the plumbing chapter or in the fuel‑gas chapter such as Table 1215.2 referenced in the code example). Those specific pipe size lookup tables are outside the three controlling items you asked to ground here; consult the chapter’s sizing tables or an engineering calculation for the final diameter selection.
Related provisions
- § 1208.3.1 — Maximum gas demand; use sum of maximum appliance inputs and altitude adjustment.
- § 1208.3.2 — Permitted sizing methods (tables, listed manufacturer tables, engineering).
- § 1208.3.3 — Allowable pressure drop: supply pressure at appliance inlets must meet minimum required pressure.
- § 1208.4 — Maximum operating pressure in buildings (limits on interior piping pressures).
- Example materials and methods and longer‑run/engineering guidance are covered in the chapter and example figures (see the chapter example using Table 1208.3.1 and the pipe sizing tables).
Code references
Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:
California Residential Code High relevance — show source text
LEADER,
OR PIPE|FLOW|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)**| |inches|gpm1|1 (in/h)|2 (in/h)|3 (in/h)|4 (in/h)|5 (in/h)|6 (in/h)|7 (in/h)|8 (in/h)|9 (in/h)|10 (in/h)|11 (in/h)|12 (in/h)| |2|30|2880|1440|960|720|575|480|410|360|320|290|260|240| |3|92|8800|4400|2930|2200|1760|1470|1260|1100|980|880|800|730| |4|192|18 400|9200|6130|4600|3680|3070|2630|2300|2045|1840|1675|1530| |5|360|34 600|17 300|11 530|8650|6920|5765|4945|4325|3845|3460|3145|2880| |6|563|54 000|27 000|17 995|13 500|10 800|9000|7715|6750|6000|5400|4910|4500| |8|1208|116 000|58 000|38 660|29 000|23 200|19 315|16 570|14 500|12 890|11 600|10 545|9600|CRC § 0.06 High relevance — show source text
AT VARIOUS RAINFALL RATES**
(square feet)|MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES
(square feet)| |inches|gpm1|1 (in/h)|2 (in/h)|3 (in/h)|4 (in/h)|5 (in/h)|6 (in/h)|7 (in/h)|8 (in/h)|9 (in/h)|10 (in/h)|11 (in/h)|12 (in/h)| |2|30|2880|1440|960|720|575|480|410|360|320|290|260|240| |3|92|8800|4400|2930|2200|1760|1470|1260|1100|980|880|800|730| |4|192|18 400|9200|6130|4600|3680|3070|2630|2300|2045|1840|1675|1530| |5|360|34 600|17 300|11 530|8650|6920|5765|4945|4325|3845|3460|3145|2880| |6|563|54 000|27 000|17 995|13 500|10 800|9000|7715|6750|6000|5400|4910|4500| |8|1208|116 000|58 000|38 660|29 000|23 200|19 315|16 570|14 500|12 890|11 600|10 545|9600|For SI units: 1 inch = 25 mm, 1 gallon per minute = 0.06 L/s, 1 inch per hour = 25.4 mm/h, 1 square foot = 0.0929 m [2]
Notes: 1 Maximum discharge capacity, gpm (L/s) with approximately 1 3 ⁄ 4 inch (44 mm) head of water at the drain. 2 For rainfall rates other than those listed, determine the allowable roof area by dividing the area given in the 1 inch per hour (25.4 mm/h) column by the desired rainfall rate. 3 Vertical piping shall be round, square, or rectangular. Square pipe shall be sized to enclose its equivalent round pipe. Rectangular pipe shall have not less than the same cross-sectional area as its equivalent round pipe, except that the ratio of its side dimensions shall not exceed 3 to 1.
(3) For two adjacent walls of unequal height – add 35 percent of the total common height and add 50 percent of the remaining height of the highest wall. (4) Two opposite walls of same height – add no additional
area.
CRC § 1015.5 High relevance — show source text
Screen porches 1015.5 Stairs 1015.2
Vehicle barrier 406.4.2, 1607.11 Windows 1015.8
Gutters 1502.3 Gymnasiums 303.4 Group E 303.1.3 Live load Table 1607.1 Occupant load 1004.5 Gypsum Chapter 25 Board Chapter 25 Ceiling diaphragms 2508.6 Concrete, reinforced gypsum 2514 Construction 2508 Draftstopping 718.3.1 Exterior soffit Table 2506.2 Fastening Table 2306.3(3), 2508.1 Fire resistance 719, 722.2.1.4, 722.6.2 Fire-resistant joint treatment 2508.5 Inspection 2503 Lath 2507, 2510 Lathing and furring for cement plaster 719, 2510 Lathing and plastering 2507 Materials 2506
Panel products Chapter 25 Performance 2502 Plaster, exposed aggregate 2513 Plaster, exterior 2512 Plaster, interior 2511 Shear wall construction Table 2306.3(3), 2308.10.3, 2505 Sheathing Table 2308.9.9, Table 2508.1, 2508.2, 2508.5, 2510.5.2.2 Showers and water closets 2509
Stucco 2510
Veneer base 2507.2
Veneer plaster 2507.2, 2511.1, Table 2511.1.1
Vertical and horizontal assemblies
2504
Wallboard Table 2506.2, 2508.2, 2508.2.1, 2508.4, 2510.5.2.1 Water-resistant backing board 2506.2, 2509.2
Habitable Space 1208 Handrails 1014 Alternating tread devices 1011.14 Assembly aisles 1030.16 Construction 1014.5, 1014.6, 1014.7 Extensions 1014.7 Glazing 2407 Graspability 1014.4 Guards 1015.3 Height 1014.2 Loads 1607.9
Location 1014.1, 1014.8, 1014.9,
1014.10
Ramps 1012.8 Stairs 1011.11
Hardboard 1403.3.2, 2303.1.7 Hardware (see Doors and Locks and Latching) Hardwood
Fastening 2304.10 Quality 2303.3 Veneer 1403.3.2 Hazardous Materials 307, 414, 415 Compliance with California Fire Code 307.2
Control areas 414.2
Explosion control 414.5.1, Table 414.5.1, 415.11.6.5, 426.1.4 Mercantile occupancies 309.2 Reporting 414.1.3 Sprinkler protection Table 414.2.5.1, Table 414.2.5.2, 415.4, 415.11.12,
903.2.5
CRC § 1215.5 High relevance — show source text
(6) Size each section of branch piping not previously sized by measuring the distance from the gas meter location to the most remote outlet in that branch and follow the procedures of steps 2, 3, 4, and 5 above. Size branch piping in the order of their distance from the meter location, beginning with the most distant outlet not previously sized.
1215.5 Engineering Methods. For conditions other than those covered by Section 1215.1, such as longer runs or greater gas demands, the size of each gas piping system shall be determined by standard engineering methods acceptable to the Authority Having Jurisdiction, and each such system shall be so designed that the total pressure drop between the meter or another point of supply and an outlet where full demand is being supplied to all outlets, shall be in accordance with the requirements of Section 1208.4. 1215.6 Variable Gas Pressure. Where the supply gas pressure exceeds 5 psi (34.6 kPa) for natural gas and 10 psi (69 kPa) for undiluted propane or is less than 6 inches (1.5 kPa) of water column, or where diversity demand factors are used, the design, pipe, sizing, materials, location, and use of such systems first shall be approved by the Authority Having Jurisdiction. Piping systems designed for pressures exceeding the serving gas supplier’s standard delivery pressure shall have prior verification from the gas supplier of the availability of the design pressure.
2025 CALIFORNIA PLUMBING CODE 235
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
FUEL GAS PIPING
FIGURE 1215.1.1
EXAMPLE ILLUSTRATING USE OF TABLE 1208.3.1 AND TABLE 1215.2(1)
Problem: Determine the required pipe size of each section and outlet of the piping system shown in Figure 1215.1.1. Gas to be used has a specific gravity of 0.60 and 1100 British thermal units (Btu) per cubic foot (0.0114 kW•h/L), delivered at 8 inch water column (2.0 kPa) pressure.
For SI units: 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1000 British thermal units per hour = 0.293 kW, 1 cubic foot per hour = 0.0283 m [3] /h
Solution:
(1) Maximum gas demand of Outlet A — 32 cubic feet per hour (0.91 m [3] /h) (from Table 1208.3.1).
Maximum gas demand of Outlet B — 3 cubic feet per hour (0.08 m [3] /h) (from Table 1208.3.1).
Maximum gas demand of Outlet C — 59 cubic feet per hour (1.67 m [3] /h) (from Table 1208.3.1).
Maximum gas demand of Outlet D — 136 cubic feet per hour (3.85 m [3] /h) [150 000 Btu/hour (44 kW) divided by 1100 Btu per cubic foot (0.0114 kW•h/L)].
(2) The length of pipe from the gas meter to the most remote outlet (Outlet A) is 60 feet (18 288 mm).
CRC § 2506.2 High relevance — show source text
Vertical and horizontal assemblies
2504
Wallboard Table 2506.2, 2508.2, 2508.2.1, 2508.4, 2510.5.2.1 Water-resistant backing board 2506.2, 2509.2
Habitable Space 1208 Handrails 1014 Alternating tread devices 1011.14 Assembly aisles 1030.16 Construction 1014.5, 1014.6, 1014.7 Extensions 1014.7 Glazing 2407 Graspability 1014.4 Guards 1015.3 Height 1014.2 Loads 1607.9
Location 1014.1, 1014.8, 1014.9,
1014.10
Ramps 1012.8 Stairs 1011.11
Hardboard 1403.3.2, 2303.1.7 Hardware (see Doors and Locks and Latching) Hardwood
Fastening 2304.10 Quality 2303.3 Veneer 1403.3.2 Hazardous Materials 307, 414, 415 Compliance with California Fire Code 307.2
Control areas 414.2
Explosion control 414.5.1, Table 414.5.1, 415.11.6.5, 426.1.4 Mercantile occupancies 309.2 Reporting 414.1.3 Sprinkler protection Table 414.2.5.1, Table 414.2.5.2, 415.4, 415.11.12,
903.2.5
Ventilation 414.3, 415.9.1.7, 415.11.1.6, 415.11.1.8.1, 415.11.3.2, 415.11.6.8, 415.11.7.4, 415.11.8, 415.11.11, 1202.6 Weather protection 414.6.1 Hazardous Occupancy (Group H), (see Hazardous Materials) 307, 414, 415 Alarms and detection 415.11.2, 415.11.4, 415.11.6.9, 415.11.8, 415.3, 415.5, 907.2.5, 908.1, 908.2 Area 503, 505, 506, 507, 508 Dispersing 414.5, 414.6, 415.6 Gas detection systems 415.11.7 Group provisions H-1 (detonation) 307.3, 415.6.2, 415.7, 415.6.4.1, 415.7.1 H-2 (deflagration) 307.4, 415.8, 415.9 H-3 (physical hazard) 415.10, 307.5, 415.8 H-4 (health hazard) 307.6, 415.10 H-5 (semiconductor) 307.7, 415.11 Height 415.7, 415.8.1, 415.9.1.1, 426.1.1, 503, 504, 505, 506 Incidental uses 509
CRC § 904.7 High relevance — show source text
Foam systems 904.7 Glazing 2406, 2408.2.1 Halon systems 904.9 Personnel and material hoists 3004.4
Roof tile 1504.3.1
Seismic 1704.2
Smoke control 909.3, 909.5.2, 909.10.2, 909.12.1, 909.13.3, 909.18, 909.20.7.3, 909.21.7, 1705.19 Soils1 803
Sound transmission 1208 Sprinkler protection 903.5 Structural (see Special Inspections and Tests) Wet chemical systems 904.5 Testing Agency (definition) 202 Theaters [see Assembly Occupancy (Group A), Projection Rooms and Stages and Platforms] Thermal Barrier, Foam Plastic Insulation 2603.4, 2603.5.2 Thermal-insulating Materials (See Insulation) 712 Tile 202 Ceramic (see Ceramic Tile) Fire resistance, clay or shale 721.1 Tires, Bulk Storage of 311.2 Toddler 202 Toilets and Toilet Rooms Chapters 11A and 11B, 3305 Accessible 1127A, 1134A, 11B-213,
1607.9.2
Construction/finish materials 1210 Door locking 11B-404, Chapter 29 Family or assisted-use Chapter 11B and 29 Adult changing tables 11B-249 Fixture count Chapter 29 Grab bar live loads 1607.9.2 Location Chapter 29 Partitions 1210.3
Privacy 1210.3 Public facilities Chapter 29 Signs Chapters 11A and 11B, 1143A Single user Chapter 29 Ventilation 1202.5.2.1
Tornado 1603.1.4, 1609.5, 1609.6.3,
1609.6.3.2 Tornado Shelter (see Storm Shelter)
Towers Airport traffic control 412.2 Cooling 1511.4 Location and access 3108.2
Radio 3108
Television 3108
Townhouses 101.2, 202
Toxic Materials [see High-hazard Occupancy (Group H)] Classification 307.6, 414, 415 Gas detection system 415.11.7, 421.5, 908.3
Transient 310.2, 310.4 Transient Lodging (definition) 202 Transportation 11B-810 Travel Distance Area of refuge 1009.6.1 Assembly seating 1030.7 Atrium 404.9 Balcony, exterior 1017.2.1 Care suites (Group I-2) 407.4.2, 407.4.4 Common path of travel 1006.2.1 Drinking fountains Chapter 29 Exit access 1017.2
Mall 402.8.5, 402.8.6
CRC § 1.3 High relevance — show source text
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
REFERENCED STANDARDS
S-1.3—(2020): Pressure Relief Device Standards—Part 3—Stationary Storage Containers for Compressed Gases
5303.3.2, 5503.2
V-1—(2021): Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections
3505.2.1
CGR Coast Guard Regulations, c/o Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402-9325
46 CFR Parts 30, 32, 35 & 39—1999: Shipping
5706.8
CPSC Consumer Product Safety Commission, 4330 East-West Highway, Bethesda, MD 20814
16 CFR Part 1500 (2009): Hazardous Substances and Articles; Administration and Enforcement Regulations
202, 5601.1.3
16 CFR Part 1500.41 (2009): Method for Testing Primary Irritant Substances
202
16 CFR Part 1500.42 (2009): Test for Eye Irritants
202
16 CFR Part 1500.44 (2009): Method for Testing Extremely Flammable and Flammable Solids
202
16 CFR Part 1507 (2002): Fireworks Devices
202, 5601.1.3
16 CFR Part 1630 (2007): Standard for the Surface Flammability of Carpets and Rugs
804.3.3.1, 804.3.3.2
CSA CSA Group, 8501 East Pleasant Valley Road, Cleveland, OH 44131
ANSI Z21.69—2015 (R2020)/CSA 6.16—(R2020): Connectors for Moveable Gas Appliances
606.4
ANSI Z83.26—2014/CSA 2.37—14: Gas-Fired Outdoor Infrared Patio Heaters
4103.1.2.2.1
CSA/ANSI FC1—21/CSA C22.2 No 62282-2-100—21: Fuel Cell Technologies—Part 3-100: Stationary Fuel Cell Power Systems—Safety
1206.3
CSA/ANSI NGV 5.1—22: Residential Fueling Appliances
2308.2.3
CSA/ANSI NGV 5.2—2022: Vehicle Fueling Appliances (VFA)
2308.2.4
DOC U.S. Department of Commerce, 1401 Constitution Avenue, NW, Washington, DC 20230
16 CFR Part 1632—2015: Standard for the Flammability of Mattress and Mattress Pads (FF 4-72, Amended)
805.1.2.1, 805.2.2.1, 805.3.2.1, 805.4.2.1
DOL U.S. Department of Labor, c/o Superintendent of Documents, Washington, DC 20402-9325
29 CFR Part 1910.1000—2015: Air Contaminants
202, 2104.2.1
29 CFR Part 1910.1200 (2015): Hazard Communication
202, 5603.6
DOTn U.S. Department of Transportation, Office of Hazardous Material Safety, 1200 New Jersey Avenue SE, East Building 2nd Floor, Washington, DC 20590
CRC § 12-6 High relevance — show source text
1203 Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . 12-6
1204 Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-7
1205 Yards or Courts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-7
1206 Sound Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-8
1207 Enhanced Classroom Acoustics . . . . . . . . . . . . . . . . . 12-8
1208 Interior Space Dimensions . . . . . . . . . . . . . . . . . . . . . 12-8
1209 Access to Unoccupied Spaces. . . . . . . . . . . . . . . . . . . 12-9
1210 Toilet and Bathroom Requirements . . . . . . . . . . . . . 12-9
1211 UV Germicidal Irradiation Systems . . . . . . . . . . . . . 12-10
1212 [HCD 1 & HCD 2] Garage Door Springs . . . . . . . . . . . .12-10
1213 [HCD 1] Pollutant Control . . . . . . . . . . . . . . . . . . . . . . .12-11
1214 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11
1215 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11
1216 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11
1217 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11
1218 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11
1219 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11
1220 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11
1221 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11
CRC § 0.293 Medium 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]
«
«
«
«
«
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
«
«
«
«
«
«
«
«
«
«
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}
CRC § 1208.0 Medium relevance — show source text
1208.0 Gas Piping System Design, Materials, and Components. 1208.1 Installation of Piping System. Where required by the Authority Having Jurisdiction, a piping sketch or plan shall be prepared before proceeding with the installation. The plan shall show the proposed location of piping, the size of different branches, the various load demands, and the location of the point of delivery. [NFPA 54:5.1.1] 1208.1.1 Addition to Existing System. When additional appliances are being connected to a gas piping system, the existing piping shall be checked to determine whether it has adequate capacity. If the capacity of the system is determined to be inadequate for the additional appliances, the existing system shall be enlarged as required, or separate gas piping of adequate capacity shall be provided. [NFPA 54:5.1.2] 1208.2 Interconnections Supplying Separate Users. Where two or more meters, or two or more service regulators where meters are not provided, are located on the same premises and supply separate users, the gas piping systems shall not be interconnected on the outlet side of the meters or service regulators. [NFPA 54:5.2.1] 1208.2.1 Interconnections for Standby Fuels. Where a supplementary gas for standby use is connected downstream from a meter or a service regulator where a meter is not provided, equipment to prevent backflow shall be installed. A three-way valve installed to admit the standby supply and at the same time shut off the regular supply shall be permitted to be used for this purpose.
[NFPA 54:5.2.2.1 – 5.2.2.2] 1208.3 Sizing of Gas Piping Systems. Gas piping systems shall be of such size and so installed as to provide a supply of gas sufficient to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance. [NFPA 54:5.3.1]
1208.3.1 Maximum Gas Demand. The volumetric flow rate of gas to be provided shall be the sum of the maximum input of the appliances served. The volumetric flow rate of gas to be provided shall be adjusted for altitude where the installation is above 2000 feet (610 m). [NFPA 54:5.3.2.1 – 5.3.2.2] Where the input rating is not indicated, the gas supplier, appliance manufacturer, or a qualified agency shall be contacted, or the rating from Table 1208.3.1 shall be used for estimating the volumetric flow rate of gas to be supplied.
The total connected hourly load shall be used as the basis for piping sizing, assuming all appliances are operating at full capacity simultaneously.
«
«
«
216 2025 CALIFORNIA PLUMBING CODE
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
FUEL GAS PIPING
the inlet connection of all appliances served shall be such that the supply pressure at each appliance inlet is greater than or equal to the minimum pressure required by the appliance. [NFPA 54:5.3.4]
1208.4 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.
CRC § 93.3 Medium 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 § 109.3 Medium relevance — show source text
1211
Valuation or Value (see Fees, Permit) 109.3 Vapor Diffusion Port 202 Vapor Retarders 1202.3, 1404.3, 1404.3.2 Vegetative Artificial decorative 419, 419.1 Vegetative roofs 1505.10, 1507.15 Vehicle Barrier 1607.11 Vehicle Barrier Systems 406.4.2, 1607.11 Vehicle Show Rooms 304 Vehicular Fueling 406.7 Vehicular Gates 3110 Vehicular Repair 406.8
Veneer Cement plaster 1404.16, 1411 Fastening 1404.5 Fiber-cement siding 1404.17, 1411 Glazing 1404.13, 1411 Masonry, adhered 1404.11, 2101.2.1, 2103.2.4 Masonry, anchored 1404.7, 1411, 2101.2.1
Metal 1404.12
Plastic 1411, 2605 Slab-type 1404.9, 1411
Testing Automatic fire-extinguishing systems 904.4
Automatic water mist systems 904.11.3 Building official required 104.2.3.6 Carbon dioxide systems 904.8 Clean agent system 904.10 Dry chemical systems 904.6 Emergency and standby power 2702.4 Fire alarm systems 907.7, 907.8 Fire pumps 913.5 Fire-resistant materials 703.2
Foam systems 904.7 Glazing 2406, 2408.2.1 Halon systems 904.9 Personnel and material hoists 3004.4
Roof tile 1504.3.1
Seismic 1704.2
Smoke control 909.3, 909.5.2, 909.10.2, 909.12.1, 909.13.3, 909.18, 909.20.7.3, 909.21.7, 1705.19 Soils1 803
Sound transmission 1208 Sprinkler protection 903.5 Structural (see Special Inspections and Tests) Wet chemical systems 904.5 Testing Agency (definition) 202 Theaters [see Assembly Occupancy (Group A), Projection Rooms and Stages and Platforms] Thermal Barrier, Foam Plastic Insulation 2603.4, 2603.5.2 Thermal-insulating Materials (See Insulation) 712 Tile 202 Ceramic (see Ceramic Tile) Fire resistance, clay or shale 721.1 Tires, Bulk Storage of 311.2 Toddler 202 Toilets and Toilet Rooms Chapters 11A and 11B, 3305 Accessible 1127A, 1134A, 11B-213,
1607.9.2
Frequently asked questions
What is the single best place to find appliance input numbers?
Use Table 1208.3.1 for typical appliance inputs, or use the appliance nameplate/manufacturer if available. Table 1208.3.1 is explicitly permitted as an estimating source in the chapter.
Can I use diversity (not all appliances operating at once) when sizing piping?
The chapter bases sizing on the total connected hourly load (i.e., assuming simultaneous full demand) unless the use of established load diversity factors is specifically permitted and accepted by the Authority Having Jurisdiction. See § 1208.3.1.
Which is controlling: pipe tables or manufacturer instructions?
Either is allowed — the code permits pipe sizing tables in the chapter or listed manufacturer sizing tables. If conditions fall outside tabulated limits, the code allows engineering methods with AHJ approval. See § 1208.3.2.
Do I need to check pressure at every appliance?
Yes — design so the supply pressure at each appliance inlet is greater than or equal to the appliance’s minimum required pressure; this is the allowable pressure‑drop requirement in § 1208.3.3.
If my site is above 2,000 ft, what changes?
You must adjust the volumetric flow (cubic feet per hour) for altitude when computing maximum gas demand per § 1208.3.1. Use manufacturer or gas‑supplier guidance for the adjustment.
More in California Residential Code
Ask about the CRC
Get cited, plain-English answers on the California Residential Code for your project — any code section, any scenario.
Start Free Trial