CPC · California Plumbing Code

What rules govern alterations, repairs, and re-pressurization of existing fuel gas piping?

Q: When can I skip a full pressure test after repairing a gas line?

You can avoid a full pressure test for minor repairs or additions provided the work is inspected and each connection is tested with a noncorrosive leak‑detecting fluid or other AHJ‑approved method, per § 1213.1.2 .

Q: Do I need to notify the inspector before turning the gas back on?

Yes. § 1203.1 requires notifying the Authority Having Jurisdiction that the gas piping is ready for inspection before using the system after installation, alteration, or repair.

Q: Where is § 1213.4.2? The index lists it but I can’t find the text.

The CPC index in the uploaded files lists § 1213.4.2 , but the specific body text for § 1213.4.2 was not present in the files you provided. The summary and the other sections cited above are present and were used for this guidance.

If you alter or repair existing gas piping in California, notify the inspector before putting the line back in service, have the work inspected, and either pressure‑test the affected piping or (for minor repairs) test each connection with a noncorrosive leak test per the CPC. Larger openings or long/large piping runs require outdoor purging (with distance and monitoring rules) and an immediate leak check after the gas is turned on. See **§ 1203.1** and **§ 1213.1.2**; purging/leak‑check rules are in **§ 1213.6** and **§ 1213.5.2**.

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Last reviewed: July 6, 2026

What the code requires — plain English, controlling §

Work on existing fuel gas piping — including alterations and repairs — must be inspected and, where required, tested so the piping remains safe before it is put back into service. See § 1203.1 for the inspection/notification requirement.
Minor repairs and additions do not always require a full pressure test; however, the affected connections must be inspected and tested using a noncorrosive leak-detecting fluid or other approved leak-detection method. See § 1213.1.2.
The CPC also contains provisions for leak checking and purging when piping is placed back into service; those purging/venting distances and monitoring steps must be followed when re‑pressurizing. (Relevant purging and leak-check rules appear in the CPC fuel‑gas testing sections.)

The most important rule: notify the Authority Having Jurisdiction before returning altered or repaired gas piping to service, and follow the CPC’s inspection, leak-test, and purging requirements — minor repairs may avoid a full pressure test only if the work is inspected and the connections are tested with approved leak-detection methods. See § 1203.1 and § 1213.1.2.

Requirements in detail

1) Inspections and notification

Before using piping after installation, alteration, or repair you must notify the Authority Having Jurisdiction that the piping is ready for inspection. This is the formal trigger for required inspections (rough and final). See § 1203.1.

2) When a pressure test is required (and when it is not)

A piping installation is normally pressure‑tested prior to acceptance. Where repairs or additions are made after an initial pressure test, the affected piping shall be tested.
Exception: Minor repairs and additions are not required to be pressure tested provided that:
- the work is inspected, and
- connections are tested with a noncorrosive leak‑detecting fluid or another leak‑detection method approved by the Authority Having Jurisdiction. See § 1213.1.2.

3) New branches vs. existing piping

When a new branch is installed to serve new appliance(s), only the new branch needs to be pressure tested; the tie‑in to the existing piping must be tested by leak‑detection methods (noncorrosive fluid or approved alternative). See § 1213.1.3.

4) Leak check and re-pressurization after interruption of service

Immediately after gas is turned on into a new system or into a system that has been initially restored after an interruption of service, the piping must be checked for leakage. Any leakage found requires the gas be shut off until repairs are made. See § 1213.5.2.

5) Purging (when piping contains air or has been isolated)

Purging procedures depend on design operating pressure and the size/length of the piping being purged (see Table 1213.6.1 in the CPC). In many cases purging must discharge to an outdoor location and be continuously attended and monitored. Important quantifiable requirements include minimum discharge distances and a stopping criterion at 90 percent fuel gas by volume. See § 1213.6.1.4 and Table 1213.6.1.

Decision-relevant dimensions, thresholds and code references

Decision question	Key value / threshold	What that means in practice	Code Reference
Is a full pressure test required after a repair?	N/A — depends on extent	Minor repairs or additions: may avoid full pressure test if inspected and leak‑checked with noncorrosive fluid or approved method. See exception.	§ 1213.1.2
When must the affected piping be pressure‑tested?	When repairs/additions are made following a pressure test (unless minor)	Test the affected piping or the system/section as required.	§ 1213.1.2
Leak check after restoring gas	Immediately after gas is turned on	Shut gas off if leakage is indicated; repair and retest.	§ 1213.5.2
Purge discharge distance from building openings / ignition sources	10 feet from building openings and sources of ignition; 25 feet from mechanical air intake openings	Purge outdoors to a point meeting these clearances and continuously monitor during discharge.	§ 1213.6.1.4 and Table 1213.6.1
When to stop purging while introducing fuel gas	90 percent fuel gas by volume detected in pipe	Use a listed, calibrated combustible‑gas indicator showing 0–100% in 1% increments.	§ 1213.6.1.4 (4) & § 1213.6.1.5
Size/length criteria that force outdoor purging	See Table 1213.6.1 (examples): ≥2½–<3" & >50 ft; ≥3–<4" & >30 ft; ≥4–<6" & >15 ft; ≥6–<8" & >10 ft	If your piping falls into the table thresholds, you must purge outdoors per the listed provisions.	Table 1213.6.1

Exceptions & special cases

Minor repairs/additions: no full pressure test required if the work is inspected and all connections are leak‑checked with an approved, noncorrosive leak‑detecting fluid or other approved method. § 1213.1.2 governs this exception.
New branch installations: only the newly installed branch needs pressure testing; the joint to existing system can be tested by leak‑detecting fluid/approved methods. See § 1213.1.3.
Where Table 1213.6.1 criteria are exceeded (size/length), purging must be done outdoors and follow the discharge distance, monitoring, and stopping‑at‑90% rules. See Table 1213.6.1 and § 1213.6.1.4.

Note: the CPC index and cross references list § 1213.4.2 as one of the sections related to alterations and repairs, but the uploaded CPC text I was given shows the listing of that section without the body text for § 1213.4.2 itself. I could not locate the actual text of § 1213.4.2 in the provided files — the index references it but no readable section text was available to cite. (The index entry listing the section appears in the CPC file.)

Common mistakes

Assuming every repair must be pressure‑tested. The code allows an exception for minor repairs/additions if inspected and leak‑checked with an approved method — see § 1213.1.2. Failure to use the noncorrosive leak fluid or an AHJ‑approved method is a frequent error.
Skipping notification to the Authority Having Jurisdiction before placing altered/repaired piping back into service. Always notify per § 1203.1.
Improper purging: discharging purge gas too close to building openings, ignition sources, or air intakes, or not continuously monitoring the purge point — the CPC sets 10 ft and 25 ft clearances and monitoring/attendance requirements.
Using corrosive solutions for connection leak tests — the code requires noncorrosive test fluids. See § 1213.1.2.

Worked example — concrete scenario with numbers

Scenario: A contractor replaces a damaged run and adds a new branch to serve a new appliance. The new branch is 35 feet of 3‑inch nominal pipe; the rest of the system is existing.

Step-by-step application of CPC rules:

Notification/inspection: Contractor notifies the Authority Having Jurisdiction when the work is complete and ready for inspection, per § 1203.1.
Pressure test requirement:
- The new 35 ft, 3‑inch branch qualifies as a new branch; under § 1213.1.3, only the newly installed branch must be pressure tested as a branch (not necessarily the whole system). Connections to existing piping must be leak‑checked using a noncorrosive leak‑detecting fluid or approved method.
Purging:
- Table 1213.6.1 shows that for nominal ≥3 <4 inch** piping, **purge outdoors** is required if length is **>30 ft. Because the new branch is 35 ft, outdoor purging is required. The purge discharge point must be at least 10 feet from building openings and ignition sources and 25 feet from mechanical air intakes, and it must be continuously attended and monitored with a listed combustible‑gas indicator; stop the purge when 90% fuel‑gas by volume is detected. See Table 1213.6.1 and § 1213.6.1.4.
Leak check after re‑pressurization:
- Immediately after turning the gas on, perform the required leakage check. If any leakage is indicated, shut off gas and repair before placing appliance(s) in service. See § 1213.5.2.

Result: Test the new branch under pressure as required; test the tie‑in connections using noncorrosive leak fluid; purge outdoors per the size/length rules; perform the immediate leak check after re‑pressurization. Notify the AHJ for inspection before placing the system back into service.

Related provisions (selected CPC sections)

§ 1203.1 — Inspection notification before use of installed/altered/repaired gas piping.
§ 1213.1.2 — Repairs and additions: when pressure tests are required and the “minor repairs” exception (noncorrosive leak testing).
§ 1213.1.3 — New branches: testing only the new branch and leak‑testing the connection to existing piping.
§ 1213.5.2 — Leak check required immediately after gas is turned on into a new system or after service restoration.
§ 1213.6.1.4 — Outdoor discharge and purge monitoring/distance/stopping criteria (e.g., 10 ft, 25 ft, 90%).
Table 1213.6.1 — Size and length thresholds that determine indoor vs outdoor purging.
Note: the CPC index references § 1213.4.2 for alterations/repairs topics, but the uploaded file set did not include the body text for § 1213.4.2 (the index entry is present). I could not locate an explicit text block for § 1213.4.2 in the provided files.

Code references

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

CPC § 4.2.1 High relevance — show source text
1101.4.2.1, 1104.4.2.2

AIR GAPS

Backflow prevention . . . . . . 603.2, Table 603.2, 603.3.1, Table 603.3.1, 603.4.4

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

Discharge from drinking

water treatment units . . . . . . . . . . . . . . . . . . . . . 611.2

AIR TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .710.11

ALTERATIONS AND REPAIRS

Fuel gas piping . . . . . . . . . . . .1203.1, 1213.1.2, 1213.4.2

Health care facilities . . . . . . . . . . . . . . . . . . . . . . .1301.5

Plumbing systems . . . . . . . . . . . . . . . . . .102.4, 301.2.5 ALTERNATE MATERIALS, DESIGN,

AND METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . .301.3

ALTERNATE WATER SOURCE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203.0

For nonpotable applications . . .Chapter 15, Chapter 16 For special water features . . . . . . . . . . . . . . . . .L 406.1

Future connections . . . . . . . . . . . . . . . . . . . . .1504.9.1

Identification of piping . . . . . . . . . . . . . . . . . . . . .601.3.3 Nonpotable rainwater catchment system . . . . . . . . . . .Table 1601.5, 1602.4

Potable rainwater

catchment system . . . . . . . . . . . . . . . . . . . . . .K 102.2 ANODELESS RISER, DEFINITION . . . . . . . . . . . . . . .203.0

APPLIANCES

Automatically operated . . . . . . . . . . . .509.3.4, 509.5.7.1 Categorized vent diameter/area, definition . . . . . . . . . . . . . . . . . .203.0 Connections to building fuel gas piping . . . . . . . . . . . . . . . . . . . . . . . . .1212.0

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203.0

Direct-vent . . . . . . . . . . . . . . . .206.0, 509.2.6, 509.5.10.1,

509.8.1, 509.12

2025 CALIFORNIA PLUMBING CODE 563
CPC § 102.4 High relevance — show source text
under which installed.

The owner or the owner’s designated agent shall be responsible for maintenance of plumbing systems. To determine compliance with this subsection, the Authority Having Jurisdiction shall be permitted to cause a plumbing system to be reinspected.

102.4 Additions, Alterations, Renovations, or Repairs. Additions, alterations, renovations or repairs shall conform to that required for a new system without requiring the existing plumbing system to be in accordance with the requirements of this code. Additions, alterations, renovations, or repairs shall not cause an existing system to become unsafe, insanitary, or overloaded.

Additions, alterations, renovations, or repairs to existing plumbing installations shall comply with the provisions for new construction unless such deviations are found to be necessary and are first approved by the Authority Having Jurisdiction. 102.4.1 Building Sewers and Drains. Existing building sewers and building drains shall be permitted to be used in connection with new buildings or new plumbing and drainage work where they are found on examination and test to be in accordance with the requirements governing new work, and the proper Authority Having Jurisdiction shall notify the owner to make changes necessary to be in accordance with this code. No building, or part thereof, shall be erected or placed over a part of a drainage system that is constructed of materials other than those approved elsewhere in this code for use under or within a building. 102.4.2 Openings. Openings into a drainage or vent system, excepting those openings to which plumbing fixtures are properly connected or which constitute vent terminals, shall be permanently plugged or capped in an approved manner, using the appropriate materials in accordance with this code.

102.5 Health and Safety. Where compliance with the provisions of this code fails to eliminate or alleviate a nuisance, or other dangerous or insanitary condition that involves health or safety hazards, the owner or the owner’s agent shall install such additional plumbing and drainage facilities or shall make such repairs or alterations as ordered by the Authority Having Jurisdiction. 102.6 Changes in Building Occupancy. Plumbing systems that are a part of a building or structure undergoing a change in use or occupancy, as defined in the building code, shall be in accordance with the requirements of this code that are applicable to the new use or occupancy. 102.7 Moved Structures. Parts of the plumbing system of a building or part thereof that is moved from one foundation to another, or from one location to another, shall be in accordance with the provisions of this code for new installations and completely tested as prescribed elsewhere in this section for new work, except that walls or floors need not be removed during such test where other equivalent means of inspection acceptable to the Authority Having Jurisdiction are provided. 102.8 Appendices. The provisions in the appendices are intended to supplement the requirements of this code and shall not be considered part of this code unless formally adopted as such.

2025 CALIFORNIA PLUMBING CODE 21

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

DIVISION II SCOPE AND ADMINISTRATION

103.0 Duties and Powers of the Authority Having Jurisdiction.
CPC § 101.4 High relevance — show source text
[A] 101.4 Referenced codes. The other codes specified in Sections 101.4.1 through 101.4.7 and referenced elsewhere in this code shall be considered to be part of the requirements of this code to the prescribed extent of each such reference.

[A] 101.4.1 Gas. The provisions of the California Plumbing Code and/or the California Mechanical Code shall apply to the installation of gas piping from the point of delivery, gas appliances and related accessories as covered in this code. These requirements apply to gas piping systems extending from the point of delivery to the inlet connections of appliances and the installation and operation of residential and commercial gas appliances and related accessories.

[A] 101.4.2 Mechanical. The provisions of the California Mechanical Code shall apply to the installation, alterations, repairs and replacement of mechanical systems, including equipment, appliances, fixtures, fittings and appurtenances, including ventilating, heating, cooling, air-conditioning and refrigeration systems, incinerators and other energy-related systems.

[A] 101.4.3 Plumbing. The provisions of the California Plumbing Code shall apply to the installation, alteration, repair and replacement of plumbing systems, including equipment, appliances, fixtures, fittings and appurtenances, and where connected to a water or sewage system and all aspects of a medical gas system. The provisions of the California Plumbing Code shall apply to private sewage disposal systems.

[A] 101.4.4 Property maintenance. The provisions of the California Existing Building Code shall apply to existing structures and premises; equipment and facilities; light, ventilation, space heating, sanitation, life and fire safety hazards; responsibilities of owners, operators and occupants; and occupancy of existing premises and structures.

[A] 101.4.5 Fire prevention. The provisions of the California Fire Code shall apply to matters affecting or relating to structures, processes and premises from the hazard of fire and explosion arising from the storage, handling or use of structures, materials or devices; from conditions hazardous to life, property or public welfare in the occupancy of structures or premises; and from the construction, extension, repair, alteration or removal of fire suppression, automatic sprinkler systems and alarm systems or fire hazards in the structure or on the premises from occupancy or operation.

[A] 101.4.6 Energy. The provisions of the California Energy Code shall apply to all matters governing the design and construction of buildings for energy efficiency.

2025 CALIFORNIA BUILDING CODE 1-23

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

ADMINISTRATION

[A] 101.4.7 Existing buildings. The provisions of the California Existing Building Code shall apply to matters governing the repair, alteration, change of occupancy, addition to and relocation of existing buildings.

[OSHPD 1] The provisions of Chapters 2, 3A, 4A and 5A of the California Existing Building Code shall apply to all matters governing the repairs, alterations, change of occupancy, additions and relocation of existing structures and portions thereof under OSHPD jurisdic- tion. All references to Chapters 3, 4 and 5 of the California Existing Building Code shall be replaced by equivalent provisions in Chapters 3A, 4A and 5A.
CPC § 1503.9.5 High relevance — show source text
Valves for

nonpotable application . . . . . . . . . . . . . . . . . . .1503.9.5 Vent connectors, fuel gas . . . . . . . . . . . . . . . .509.10.11

Water meters and submeters . . . . . . . 601.2.1, 601.2.1.1,

601.2.1.2, L 407.4 Water pressure regulators and strainers . . . . . . . .608.2 ACCESSIBLE, DEFINITION . . . . . . . . . . . . . . . . . . . .203.0 ACCESSIBLE, READILY, DEFINITION . . . . . . . . . . . .203.0

ACCESSIBLE PLUMBING FACILITIES

For persons with disabilities . . . . . . . . . . . . . . . . .403.2 Protection against contact . . . . . . . . . . . . . . . . . . .403.3 Where required . . . . . . . . . . . . . . . . . . . . . . . . . . .403.1 ACCESSORY DWELLING UNIT, DEFINITION . . . . . . .203.0

ACRYLONITRILE-BUTADIENE-STYRENE

(ABS) PIPE . . . . . . . . . . . . . . . .203.0, Table 313.3, 701.2, Table 701.2, 705.1

705.9.4, 903.1, 1101.4,

1101.4.2.1, 1104.4.2.2

AIR GAPS

Backflow prevention . . . . . . 603.2, Table 603.2, 603.3.1, Table 603.3.1, 603.4.4

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

Discharge from drinking

water treatment units . . . . . . . . . . . . . . . . . . . . . 611.2

AIR TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .710.11

ALTERATIONS AND REPAIRS

Fuel gas piping . . . . . . . . . . . .1203.1, 1213.1.2, 1213.4.2

Health care facilities . . . . . . . . . . . . . . . . . . . . . . .1301.5

Plumbing systems . . . . . . . . . . . . . . . . . .102.4, 301.2.5 ALTERNATE MATERIALS, DESIGN,

AND METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . .301.3

ALTERNATE WATER SOURCE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203.0
CPC § 141.0 High relevance — show source text
Notes to Section 141.0(b)3:
1. If an existing component must be replaced with a new component, that component is considered an altered component for the purpose of determining the energy budget and must therefore meet the requirements of Section 141.0(b)3.
2. The standard design assumes the same geometry and orientation as the proposed design.
3. The “existing efficiency level” modeling rules, including situations where nameplate data is not available, are described in the Nonresidential ACM Reference Manual.
Exception 1 to Section 141.0(b): When heating, cooling or service water heating for an alteration are provided by expanding existing systems, the existing systems and equipment need not comply with Sections 110.0 through 120.9 and Section 140.4 or 140.5.

Exception 2 to Section 141.0(b): When existing heating, cooling or service water heating systems or components are moved within a building, the existing systems or components need not comply with Sections 110.0 through 120.9 and Section 140.4 or 140.5.

Exception 3 to Section 141.0(b): Where an existing system with electric reheat is expanded when adding variable air volume (VAV) boxes to serve an alteration, total electric reheat capacity may be expanded not to exceed 20 percent of the existing installed electric capacity in any one permit and the system need not comply with Section 140.4(g). Additional electric reheat capacity in excess of 20 percent may be added subject to the requirements of Section 140.4(g).

Exception 4 to Section 141.0(b): The requirements of Section 120.2(i) shall not apply to alterations of space-conditioning systems or components.

(c) Repairs. Repairs shall not increase the preexisting energy consumption of the repaired component, system or equipment.

(d) Alternate method of compliance. Any addition, alteration or repair may comply with the requirements of Title 24, Part 6 by meeting the applicable requirements for the entire building.

Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, 25910, and 25943, Public Resources Code .

156 2025 CALIFORNIA ENERGY CODE

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NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES— ADDITIONS, ALTERATIONS AND REPAIRS

SECTION 141.1—REQUIREMENTS FOR COVERED PROCESSES IN ADDITIONS, ALTERATIONS TO EXISTING NONRESIDENTIAL AND HOTEL/MOTEL BUILDINGS

Covered processes in additions or alterations to existing buildings that will be nonresidential and hotel/motel occupancies shall comply with the applicable Subsections of Section 120.6 and 140.9.

(a) Lab and Process Facility Exhaust Systems. Additions and alterations to existing laboratories and factories shall meet the requirements of Section 140.9(c).

(b) Computer Rooms. All newly installed computer room cooling systems and uninterruptible power supply systems in additions/alterations shall meet the requirements of Sections 120.6(j), 140.9(a)2 and 140.9(a)4 and comply with Item 1 below.
CPC § 9.6.7 Medium relevance — show source text
[NFPA 54:9.6.7]

1212.9 Sediment Trap. Where a sediment trap is not incorporated as a part of the appliance, a sediment trap shall be installed downstream of the appliance shutoff valve as close to the inlet of the appliance as practical at the time of appliance installation. The sediment trap shall be either a tee fitting with a capped nipple in the bottom outlet, as illustrated in Figure 1212.9, or another device recognized as an effective sediment trap. Illuminating appliances, gas ranges, clothes dryers, decorative appliances for installation in vented fireplaces, gas fireplaces, and outdoor cooking appliances shall not be required to be so equipped. [NFPA 54:9.6.8]

For SI units: 1 inch = 25.4 mm

FIGURE 1212.9

METHOD OF INSTALLING A TEE FITTING SEDIMENT TRAP

[NFPA 54: FIGURE 9.6.8]

1212.10 Installation of Piping. Piping shall be installed in a manner not to interfere with inspection, maintenance, or servicing of the appliances. [NFPA 54:9.6.9] 1212.11 Liquefied Petroleum Gas Facilities and Pip- ing. Liquefied petroleum gas facilities shall be in accordance with NFPA 58.

1213.0 Pressure Testing, Inspection, and Purging.

1213.1 Piping Installations. Prior to acceptance and initial operation, all piping installations shall be visually inspected and pressure tested to determine that the materials, design, fabrication, and installation practices comply with the requirements of this code. [NFPA 54:8.1.1.1]

1213.1.1 Inspection Requirements. Inspection shall consist of visual examination, during or after manufacture, fabrication, assembly, or pressure tests. [NFPA 54:8.1.1.2]

1213.1.2 Repairs and Additions. Where repairs or additions are made following the pressure test, the affected piping shall be tested. Minor repairs and additions are not required to be pressure tested, provided that the work is inspected and connections are tested with a noncorrosive leak-detecting fluid or other leak-detecting methods approved by the Authority Having Jurisdiction.

[NFPA 54:8.1.1.3]

1213.1.3 New Branches. Where new branches are installed to new appliance(s), only the newly installed branch(es) shall be required to be pressure tested. Connections between the new piping and the existing piping shall be tested with a noncorrosive leak-detecting fluid or approved leak-detecting methods. [NFPA 54:8.1.1.4] 1213.1.4 Piping System. A piping system shall be tested as a complete unit or in sections. Under no circumstances shall a valve in a line be used as a bulkhead between gas in one section of the piping system and test medium in an adjacent section, unless a double block and bleed valve system is installed. A valve shall not be subjected to the test pressure unless it can be determined that the valve, including the valve closing mechanism, is designed to safely withstand the pressure. [NFPA 54:8.1.1.5] **1213.1.5 Regulators and Valves.
CPC § 101.1 Medium relevance — show source text
PART 1—SCOPE AND APPLICATION

SECTION 101—SCOPE AND GENERAL REQUIREMENTS

[A] 101.1 Title. These regulations shall be known as the Building Code of [ NAME OF JURISDICTION ], hereinafter referred to as “this code.”

[A] 101.2 Scope. The provisions of this code shall apply to the construction, alteration, relocation, enlargement, replacement, repair, equipment, use and occupancy, location, maintenance, removal and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures.

Exception: Detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height with a separate means of egress, and their accessory structures not more than three stories above grade plane in height, shall comply with this code or the California Residential Code .

[A] 101.2.1 Appendices. Provisions in the appendices shall not apply unless specifically adopted.

[A] 101.3 Purpose. The purpose of this code is to establish the minimum requirements to provide a reasonable level of safety, health and general welfare through structural strength, means of egress, stability, sanitation, light and ventilation, energy conservation, and for providing a reasonable level of life safety and property protection from the hazards of fire, explosion or dangerous conditions, and to provide a reasonable level of safety to firefighters and emergency responders during emergency operations.

[A] 101.4 Referenced codes. The other codes specified in Sections 101.4.1 through 101.4.7 and referenced elsewhere in this code shall be considered to be part of the requirements of this code to the prescribed extent of each such reference.

[A] 101.4.1 Gas. The provisions of the California Plumbing Code and/or the California Mechanical Code shall apply to the installation of gas piping from the point of delivery, gas appliances and related accessories as covered in this code. These requirements apply to gas piping systems extending from the point of delivery to the inlet connections of appliances and the installation and operation of residential and commercial gas appliances and related accessories.

[A] 101.4.2 Mechanical. The provisions of the California Mechanical Code shall apply to the installation, alterations, repairs and replacement of mechanical systems, including equipment, appliances, fixtures, fittings and appurtenances, including ventilating, heating, cooling, air-conditioning and refrigeration systems, incinerators and other energy-related systems.

[A] 101.4.3 Plumbing. The provisions of the California Plumbing Code shall apply to the installation, alteration, repair and replacement of plumbing systems, including equipment, appliances, fixtures, fittings and appurtenances, and where connected to a water or sewage system and all aspects of a medical gas system. The provisions of the California Plumbing Code shall apply to private sewage disposal systems.

[A] 101.4.4 Property maintenance. The provisions of the California Existing Building Code shall apply to existing structures and premises; equipment and facilities; light, ventilation, space heating, sanitation, life and fire safety hazards; responsibilities of owners, operators and occupants; and occupancy of existing premises and structures.
CPC § 11.0 Medium relevance — show source text
11.0 - 1.11.11_|||X|||||||||||||||||||||| |1.13.0||||||||||||||||||||X||||| |Division II - Scope and
Administration||||||||||||||||||||||||| |101.0||||||||||X|X|X||X|X|||||||||| |102.0||||||||||X|X|X||X|X|||||||||| |103.0||||||||||X|X|X||X|X|||||||||| |104.2 Items 1 & 2||||X|X|||||||||||||||||||| |104.3.1||||||||||X|X|X||X|X|||||||||| |104.4.3.1|X|||||||||||||||||||||||| |105.0||||||||||X|X|X||X|X||||||||||

This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

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CHAPTER 1

ADMINISTRATION

DIVISION I

CALIFORNIA ADMINISTRATION

1.1.0 General.

1.1.1 Title. These regulations shall be known as the Califor- nia Plumbing Code, may be cited as such and will be referred to herein as “this code.” The California Plumbing Code is Part 5 of thirteen parts of the official compilation and publi- cation of the adoption, amendment, and repeal of plumbing regulations to the California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part incorporates by adoption the 2024 Uniform Plumb- ing Code of the International Association of Plumbing and Mechanical Officials with necessary California amendments.

1.1.2 Purpose. The purpose of this code is to establish the minimum requirements to safeguard the public health, safety and general welfare through structural strength, means of egress facilities, stability, access to persons with disabilities, sanitation, adequate lighting and ventilation, and energy con- servation; safety to life and property from fire and other haz- ards attributed to the built environment; and to provide safety to fire fighters and emergency responders during emergency operations.

1.1.3 Scope. The provisions of this code shall apply to the construction, alteration, movement, enlargement, replace- ment, repair, equipment, use and occupancy, location, main- tenance, removal, and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures throughout the State of California.
CPC § 1213.5.2 Medium relevance — show source text
1213.5.2 Leak Check. Immediately after the gas is turned on into a new system or into a system that has been initially restored after an interruption of service, the piping system shall be checked for leakage. Where leak

age is indicated, the gas supply shall be shut off until the necessary repairs have been made. [NFPA 54:8.2.3]

1213.5.3 Placing Appliances and Equipment in Operation. Appliances and equipment shall not be placed in operation until after the piping system has been checked for leakage in accordance with Section 1213.5.2, the piping system is purged in accordance with Section 1213.6, and connections to the appliance are checked for leakage. [NFPA 54:8.2.4]

1213.6 Purging Requirements. The purging of piping shall be in accordance with Section 1213.6.1 through Section 1213.6.3. [NFPA 54:8.3]

1213.6.1 Piping Systems Required to be Purged Outdoors. The purging of piping systems shall be in accordance with Section 1213.6.1.1 through Section 1213.6.1.5 where the piping system meets either of the following:

(1) The design operating gas pressure is greater than 2 psig (14 kPa).

(2) The piping being purged contains one or more sections of pipe or tubing meeting the size and length criteria of Table 1213.6.1. [NFPA 54:8.3.1]

TABLE 1213.6.1

SIZE AND LENGTH OF PIPING

[NFPA 54: TABLE 8.3.1]*

NOMINAL PIPING SIZE
(inches) LENGTH OF PIPING
(feet)

≥ 21⁄2 < 3 > 50

≥ 3 < 4 > 30

≥ 4 < 6 > 15

≥ 6 < 8 > 10

≥ 8 Any length

For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm
- CSST EHD size of 62 is equivalent to nominal 2 inches (50 mm) pipe or tubing size.
1213.6.1.1 Removal from Service. Where existing gas piping is opened, the section that is opened shall be isolated from the gas supply and the line pressure vented in accordance with Section 1213.6.1.4. Where gas piping meeting the criteria of Table 1213.6.1 is removed from service, the residual fuel gas in the piping shall be displaced with an inert gas. [NFPA 54:8.3.1.1]

1213.6.1.2 Removal of Piping. Where piping containing gas is to be removed, the line shall be first disconnected from sources of gas and then thoroughly purged with air, water, or inert gas before cutting, or welding is done.

1213.6.1.3 Placing in Operation. Where gas piping containing air and meeting the criteria of Table

TABLE 1213.6.1

SIZE AND LENGTH OF PIPING
CPC § 907.0 Medium relevance — show source text
RELIEF VENTS . . . . . . . . . . . . . . . . . . .907.0, 911.3, B 101.4

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .805.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0

Interceptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1009.4 REMOTE OUTLET, DEFINITION . . . . . . . . . . . . . . . . .220.0

RENDERERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601.7

REPAIRING

Defective gas pipe, prohibited . . . . . . . . . . . . .1208.5.7

REPAIRS AND ALTERATIONS TO

PLUMBING AND DRAINAGE SYSTEMS . . . . . . . .102.4

REQUIRED

Air gaps or air breaks . . . . . . . . . . . . . . . . . . . . . . .801.2 Appurtenances . . . . . . . . . . . . . . . .1505.11, 1506.10.3,

1602.9

Area of subsurface irrigation

fields and mulch basins . . . . . . . . . . . . . . . . . .1504.2

Drainage or sewer connections . . . . . . . . .304.1, 713.0

Filters . . . . . . . . . . . . . . . . . . . . . . . .1506.10.5, 1603.18

Flushing devices . . . . . . . . . . . . . . . . . . . . . . . . . .413.1 Fuel gas pipe size . . . . . . . . . . . . . . . . . . . . . . . .1215.0 Fuel gas supply . . . . . . . . . . . . . . . . . . . . . . . . . .1214.0 Gravity drainage . . . . . . . . . . . . . . . . . . . . . . . . . .709.0

Hot and cold water . . . . . . . . . . . . . . . . . . . . . . .601.2.1

Inspections . . . . . . . . . . . . . . . . . . . . .1406.0, 1502.3.4,

1605.3.4

Low-pressure cutoff . . . . . . . . . . . . . . . . . . . . . . . .609.9 Medical gas and medical vacuum pipe size . . . . . . . . . . . . . . . .1323.1

Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104.0
CPC § 304.8 Medium relevance — show source text
NOMINAL PIPING SIZE
(inches) LENGTH OF PIPING
(feet)

≥ 21⁄2 < 3 > 50

≥ 3 < 4 > 30

≥ 4 < 6 > 15

≥ 6 < 8 > 10

≥ 8 Any length

For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm
- CSST EHD size of 62 is equivalent to nominal 2 inches (50 mm) pipe or tubing size.
1213.6.1.1 Removal from Service. Where existing gas piping is opened, the section that is opened shall be isolated from the gas supply and the line pressure vented in accordance with Section 1213.6.1.4. Where gas piping meeting the criteria of Table 1213.6.1 is removed from service, the residual fuel gas in the piping shall be displaced with an inert gas. [NFPA 54:8.3.1.1]

1213.6.1.2 Removal of Piping. Where piping containing gas is to be removed, the line shall be first disconnected from sources of gas and then thoroughly purged with air, water, or inert gas before cutting, or welding is done.

1213.6.1.3 Placing in Operation. Where gas piping containing air and meeting the criteria of Table

TABLE 1213.6.1

SIZE AND LENGTH OF PIPING

[NFPA 54: TABLE 8.3.1]*

For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm
- CSST EHD size of 62 is equivalent to nominal 2 inches (50 mm) pipe or tubing size.
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FUEL GAS PIPING

1213.6.1 is placed in operation, the air in the piping shall first be displaced with an inert gas. The inert gas shall then be displaced with fuel gas in accordance with Section 1213.6.1.4. [NFPA 54:8.3.1.2]

1213.6.1.4 Outdoor Discharge of Purged Gases. The open end of a piping system being pressure vented or purged shall discharge directly to an outdoor location. Purging operations shall comply with all of the following requirements:

(1) The point of discharge shall be controlled with a shutoff valve.

(2) The point of discharge shall be located at least 10 feet (3048 mm) from sources of ignition, at least 10 feet (3048 mm) from building openings and at least 25 feet (7620 mm) from mechanical air intake openings.

(3) During discharge, the open point of discharge shall be continuously attended and monitored with a combustible gas indicator that complies with Section 1213.6.1.5.

(4) Purging operations introducing fuel gas shall be stopped when 90 percent fuel gas by volume is detected within the pipe.
CPC § 8.3.1 Medium relevance — show source text
[NFPA 54: TABLE 8.3.1]*

For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm
- CSST EHD size of 62 is equivalent to nominal 2 inches (50 mm) pipe or tubing size.
232 2025 CALIFORNIA PLUMBING CODE

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FUEL GAS PIPING

1213.6.1 is placed in operation, the air in the piping shall first be displaced with an inert gas. The inert gas shall then be displaced with fuel gas in accordance with Section 1213.6.1.4. [NFPA 54:8.3.1.2]

1213.6.1.4 Outdoor Discharge of Purged Gases. The open end of a piping system being pressure vented or purged shall discharge directly to an outdoor location. Purging operations shall comply with all of the following requirements:

(1) The point of discharge shall be controlled with a shutoff valve.

(2) The point of discharge shall be located at least 10 feet (3048 mm) from sources of ignition, at least 10 feet (3048 mm) from building openings and at least 25 feet (7620 mm) from mechanical air intake openings.

(3) During discharge, the open point of discharge shall be continuously attended and monitored with a combustible gas indicator that complies with Section 1213.6.1.5.

(4) Purging operations introducing fuel gas shall be stopped when 90 percent fuel gas by volume is detected within the pipe.

(5) Persons not involved in the purging operations shall be evacuated from all areas within 10 feet

(3048 mm) of the point of discharge. [NFPA 54:8.3.1.3]

1213.6.1.5 Combustible Gas Indicator. Com bustible gas indicators shall be listed and calibrated in accordance with the manufacturer’s instructions.

Combustible gas indicators shall numerically display a volume scale from 0 percent to 100 percent in 1 percent or smaller increments. [NFPA 54:8.3.1.4]

1213.6.2 Piping Systems Allowed to be Purged Indoors or Outdoors. The purging of piping systems shall be in accordance with the provisions of Section 1213.6.2.1 where the piping system meets both of the following:

(1) The design operating pressure is 2 psig (14 kPag) or less.

(2) The piping being purged is constructed entirely from pipe or tubing not meeting the size and length criteria of Table 1213.6.1. [NFPA 54:8.3.2]

1213.6.2.1 Purging Procedure. The piping system shall be purged in accordance with one or more of the following:

(1) The piping shall be purged with fuel gas and shall discharge to the outdoors.

(2) The piping shall be purged with fuel gas and shall discharge to the indoors or outdoors through an appliance burner not located in a combustion chamber. Such burner shall be provided with a continuous source of ignition.
CPC § 316.0 Medium relevance — show source text
REDUCERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .316.0

REFRIGERATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . .801.3

REGULATORS

Backpressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .507.9

Draft . . . . . . . . . . . . . . . . . .506.1.2, 509.12.3 – 509.12.5,

509.15

Firefighter breathing air . . . . . . . . . . . . . . . . . . . .F 501.8

Fuel gas supply . . . . . . . . . . . .507.20 – 507.22, 1202.1,

1208.2, 1208.7 – 1208.11,

1213.1.5, 1214.1, 1215.1.3,

E 404.0, E 404.4, E 404.5.2

Medical gas and medical vacuum . . .1308.3, 1321.10.2

Water supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . .608.2

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INDEX

RELIEF VENTS . . . . . . . . . . . . . . . . . . .907.0, 911.3, B 101.4

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .805.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0

Interceptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1009.4 REMOTE OUTLET, DEFINITION . . . . . . . . . . . . . . . . .220.0

RENDERERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601.7

REPAIRING

Defective gas pipe, prohibited . . . . . . . . . . . . .1208.5.7

REPAIRS AND ALTERATIONS TO

PLUMBING AND DRAINAGE SYSTEMS . . . . . . . .102.4

REQUIRED

Air gaps or air breaks . . . . . . . . . . . . . . . . . . . . . . .801.2 Appurtenances . . . . . . . . . . . . . . . .1505.11, 1506.10.3,

1602.9

Area of subsurface irrigation

fields and mulch basins . . . . . . . . . . . . . . . . . .1504.2

NOMINAL PIPING SIZE (inches)	LENGTH OF PIPING (feet)
≥ 21⁄2 < 3	> 50
≥ 3 < 4	> 30
≥ 4 < 6	> 15
≥ 6 < 8	> 10
≥ 8	Any length

NOMINAL PIPING SIZE (inches)	LENGTH OF PIPING (feet)
≥ 21⁄2 < 3	> 50
≥ 3 < 4	> 30
≥ 4 < 6	> 15
≥ 6 < 8	> 10
≥ 8	Any length

CPC § 21.7 Medium relevance — show source text

kBtu/h [ (Line # 1b) x 21.7 ft3/min/kBtu/h].||| |3.|Total calculated supply fan flow 2(a) or 2(b) ft3/min.|||

NEW CONSTRUCTION OR ENTIRE NEW DUCT SYSTEM ALTERATION:	Col2	Col3	Col4
	Duct pressurization test results (ft3/min @ 25 Pa).	Duct pressurization test results (ft3/min @ 25 Pa).	Duct pressurization test results (ft3/min @ 25 Pa).
4.	Enter tested leakage flow in ft3/min:		P P
5.	Pass if leakage percentage≤6%: [( Line #4)/(Line #3 )] x 100	%	 Pass Fail
ALTERATIONS: Pre-existing duct system with duct alteration and/or HVAC equipment change-out.	ALTERATIONS: Pre-existing duct system with duct alteration and/or HVAC equipment change-out.	ALTERATIONS: Pre-existing duct system with duct alteration and/or HVAC equipment change-out.	ALTERATIONS: Pre-existing duct system with duct alteration and/or HVAC equipment change-out.
6.	Enter tested leakage flow (cubic feet per minute): Pre-test of existing duct system prior to duct system alteration, equipment change-out, or both.
7.	Enter tested leakage flow (cubic feet per minute): Final test of new duct system or altered duct system for duct system alteration, equipment change-out, or both.
TEST OR VERIFICATION STANDARDS: For altered duct system and/or HVAC equipment change-out use one of the following three tests or verification standards for compliance:	TEST OR VERIFICATION STANDARDS: For altered duct system and/or HVAC equipment change-out use one of the following three tests or verification standards for compliance:	TEST OR VERIFICATION STANDARDS: For altered duct system and/or HVAC equipment change-out use one of the following three tests or verification standards for compliance:	TEST OR VERIFICATION STANDARDS: For altered duct system and/or HVAC equipment change-out use one of the following three tests or verification standards for compliance:
8.	Pass if leakage percentage <15% [ (Line # 7) / (Line # 3 )] x 100	%	 Pass Fail
9.	Pass if leakage reduction percentage >60% Leakage reduction = [1 - [ (Line#7) / (Line#6 )] } x 100	%	 Pass Fail
10.	Pass if all accessible leaks are sealed as confirmed by visual inspection and verifica- tion by HERS rater (sampling rate 100%).	%	 Pass Fail
	Pass if One of Lines #8 through #10 pass		 Pass Fail

For SI units: 1000 British thermal units per hour = 0.293 kW, 1 cubic foot per minute = 0.00047 m [3] /s, 1 metric ton = 1000 kg

2025 CALIFORNIA MECHANICAL CODE 501

APPENDIX E

CPC § 1.1.1.2 Medium relevance — show source text
(1) Portable LP-Gas appliances and equipment of all types that are not connected to a fixed fuel piping system.

(2) Installation of appliances such as brooders, dehydrators, dryers, and irrigation equipment used for agricultural

purposes.

(3) Raw material (feedstock) applications except for piping to special atmosphere generators.

(4) Oxygen-fuel gas cutting and welding systems.

(5) Industrial gas applications using such gases as acetylene and acetylenic compounds, hydrogen, ammonia, carbon monoxide, oxygen, and nitrogen.

(6) Petroleum refineries, pipeline compressor or pumping stations, loading terminals, compounding plants, refinery tank farms, and natural gas processing plants.

(7) Large integrated chemical plants or portions of such plants where flammable or combustible liquids or gases are produced by chemical reactions or used in chemical reactions.

(8) LP-Gas installations at utility gas plants.

(9) Liquefied natural gas (LNG) installations.

(10)Fuel gas piping in electric utility power plants.

(11)Proprietary items of equipment, apparatus, or instruments such as gas-generating sets, compressors, and calorimeters.

(12)LP-Gas equipment for vaporization, gas mixing, and gas manufacturing.

(13)LP-Gas piping for buildings under construction or renovations that is not to become part of the permanent building piping system—that is, temporary fixed piping for building heat.

(14)Installation of LP-Gas systems for railroad switch heating.

(15)Installation of LP-Gas and compressed natural gas (CNG) systems on vehicles.

(16)Gas piping, meters, gas pressure regulators, and other appurtenances used by the serving gas supplier in distribution of gas, other than undiluted LP-Gas.

(17)Building design and construction, except as specified herein.

(18)Fuel gas systems on recreational vehicles manufactured in accordance with NFPA 1192.

(19)Fuel gas systems using hydrogen as a fuel.

(20)Construction of appliances. {NFPA 54:1.1.1.2}

1203.0 Inspection.

1203.1 Inspection Notification. Upon completion of the installation, alteration, or repair of gas piping, and prior to the use thereof, the Authority Having Jurisdiction shall be notified that such gas piping is ready for inspection.

1203.2 Excavation. Excavations required for the installation of underground piping shall be kept open until the piping has been inspected and approved. Where such piping is covered or concealed before such approval, it shall be exposed upon the direction of the Authority Having Jurisdiction.

1203.3 Type of Inspections. The Authority Having Jurisdiction shall make the following inspections and either shall approve that portion of the work as completed or shall notify the permit holder wherein the same fails to be in accordance with this code.

1203.3.1 Rough Piping Inspection. This inspection shall be made after gas piping authorized by the permit has been installed and before such piping has been covered or concealed or fixture or appliance has been attached thereto. This inspection shall include a determination that the gas piping size, material, and installation meet the requirements of this code.

1203.3.2 Final Piping Inspection. This inspection shall be made after piping authorized by the permit has been installed, and after portions, thereof that are to be covered or concealed are so concealed, and before fixture, appliance, or shutoff valve has been attached thereto.

2025 CALIFORNIA PLUMBING CODE 215
CPC § 404.3 Medium relevance — show source text
2025 CALIFORNIA PLUMBING CODE 411

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APPENDIX E

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

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

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

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

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

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

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

[NFPA 501A:4.4.5.3]

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

(1) No more than one 660 gallon (2498 L) tank or two tanks with an aggregate capacity of 660 gallons (2498 L) or less shall be connected to one oil-burning appliance.
CPC § 312.0 Medium relevance — show source text
Note: Accessory dwelling units are not required to have inde- pendent service utility (drainage) connections provided they meet the specific requirements in Government Code Section 65852.2.

312.0 Protection of Piping, Tubing, Materials, and Structures.

312.1 General. Piping passing under or through walls shall be protected from breakage. Piping passing through or under cinders or other corrosive materials shall be protected from external corrosion in an approved manner. Approved provisions shall be made for expansion of hot water piping. Voids around piping passing through concrete floors on the ground shall be sealed.

312.2 Installation. Piping in connection with a plumbing system shall be so installed that piping or connections will not be subject to undue strains or stresses, and provisions shall be made for expansion, contraction, and structural settlement. No plumbing piping shall be directly embedded in concrete or masonry. No structural member shall be seriously weakened or impaired by cutting, notching, or otherwise, as defined in the California Building Code or California Residential Code . 312.3 Building Sewer and Drainage Piping. No building sewer or other drainage piping or part thereof, constructed of materials other than those approved for use under or within a building, shall be installed under or within 2 feet (610 mm) of a building or structure, or less than 1 foot (305 mm) below the surface of the ground. 312.4 Corrosion, Erosion, and Mechanical Damage. Piping subject to corrosion, erosion, or mechanical damage shall be protected in an approved manner. 312.5 Protectively Coated Pipe. Protectively coated pipe or tubing shall be inspected and tested, and a visible void, damage, or imperfection to the pipe coating shall be repaired in an approved manner. 312.6 Freezing Protection. No water, soil, or waste pipe shall be installed or permitted outside of a building, in attics or crawl spaces, or in an exterior wall unless, where necessary, adequate provision is made to protect such pipe from freezing. 312.7 Fire-Resistant Construction. Piping penetrations of fire-resistance-rated walls, partitions, floors, floor/ceiling assemblies, roof/ceiling assemblies, or shaft enclosures shall be protected in accordance with the requirements of the Cal- ifornia Building Code or California Residential Code . 312.8 Waterproofing of Openings. Joints at the roof around pipes, ducts, or other appurtenances shall be made watertight by the use of lead, copper, galvanized iron, or other approved flashings or flashing material. Exterior wall openings shall be made watertight. Counterflashing shall not restrict the required internal cross-sectional area of the vent. 312.9 Steel Nail Plates. Plastic piping or tubing, and copper or copper alloy piping or tubing penetrating framing members to within 1 inch (25.4 mm) of the exposed framing shall be protected by steel nail plates not less than No. 18 gauge (0.0478 inches) (1.2 mm) in thickness. The steel nail plate shall extend along the framing member not less than 1 [1] ⁄ 2 inches (38 mm) beyond the outside diameter of the pipe or tubing. Fuel gas piping shall be protected in accordance with Section 1210.4.3.
CPC § 113.3 Medium relevance — show source text
D 113.3 Mechanical Protection. All gas outlet risers, regulators, meters, valves, and other exposed equipment shall be protected against accidental damage. [NFPA 501A:4.4.3]

D 113.4 Special Rules on Atmospherically Con- trolled Regulators. Atmospherically controlled regulators shall be installed in such a manner that moisture cannot enter the regulator vent and accumulate above the diaphragm. Where the regulator vent is obstructed due to snow and icing conditions, shields, hoods, or other suitable devices shall be provided to guard against closing of the vent opening. [NFPA 501A:4.4.4.1 – 4.4.4.2]

D 113.5 Fuel Gas Piping Test. The manufactured home fuel gas piping system shall be tested only with air before it is connected to the gas supply. The manufactured home gas piping system shall be subjected to a pressure test with all appliance shutoff valves in their closed positions. [NFPA 501A:4.4.5]

D 113.5.1 Procedures. The fuel gas piping test shall consist of air pressure at not less than 10 inches water column or more than 14 inches water column (2.5 kPa to 3.5 kPa). The fuel gas piping system shall be isolated from the air pressure source and shall maintain this pressure for not less than 10 minutes without perceptible leakage. Upon satisfactory completion of the fuel gas piping test, the appliance valves shall be opened and the gas appliance connectors shall be tested with soapy water or bubble solution while under the pressure remaining in the piping system. Solutions used for testing for leakage shall not contain corrosive chemicals. Pressure shall be measured with a manometer, slope gauge, or gauge that is calibrated in either water inch (mm) or psi (kPa) with increments of either [1] ⁄ 10 of an inch (2.5 mm) or [1] ⁄ 10 psi (0.7 kPa) gauge, as applicable. Upon satisfactory completion of the fuel gas piping test, the manufactured home gas supply connector shall be installed and the connections shall be tested with soapy water or bubble solution.

[NFPA 501A:4.4.5.1.1 – 4.4.5.1.6]

D 113.5.2 Warning. The following warning shall be supplied to the installer:

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

D 113.5.3 Vents. Gas appliance vents shall be visually inspected to ensure that they have not been dislodged in transit and are connected securely to the appliance.

[NFPA 501A:4.4.5.3]

D 113.6 Oil Tanks. Oil tank capacities shall comply with the following:

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

(2) Two supply tanks, where used, shall be cross-connected and provided with a single fill and single vent, as described in NFPA 31 and shall be on a common slab and rigidly secured, one to the other.

Frequently asked questions

When can I skip a full pressure test after repairing a gas line?

You can avoid a full pressure test for minor repairs or additions provided the work is inspected and each connection is tested with a noncorrosive leak‑detecting fluid or other AHJ‑approved method, per § 1213.1.2.

Do I need to notify the inspector before turning the gas back on?

Yes. § 1203.1 requires notifying the Authority Having Jurisdiction that the gas piping is ready for inspection before using the system after installation, alteration, or repair.

If I open an existing gas line, how must I purge it before returning to service?

Follow the CPC purging rules: determine if your piping falls into the Table 1213.6.1 size/length thresholds; if so, purge outdoors to a point at least 10 ft from openings and 25 ft from air intakes, attend and monitor the discharge, and stop when 90% fuel gas by volume is detected. See § 1213.6.1.4 and Table 1213.6.1.

Where is § 1213.4.2? The index lists it but I can’t find the text.

The CPC index in the uploaded files lists § 1213.4.2, but the specific body text for § 1213.4.2 was not present in the files you provided. The summary and the other sections cited above are present and were used for this guidance.

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California Plumbing Code