Chapter 35 — WELDING AND OTHER HOT WORK
3509 Piping Manifolds and Hose Systems for Fuel Gases and Oxygen — 2025 California Fire Code
California Fire Code (Title 24, Part 9) · 2025 edition · updated 2026-09-25 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Fire Code (Title 24, Part 9) § 3509 · Effective January 1, 2026 · Official source: Building Standards Commission
3509.1 General.¶
The use of piping manifolds and hose systems shall be in accordance with Sections 3509.2 through 3509.7, Chapter 53 and Chapter 5 of NFPA 51.
3509.2 Protection.¶
Piping shall be protected against physical damage.
3509.3 Signage.¶
Signage shall be provided for piping and hose systems as follows:
- Above-ground piping systems shall be marked in accordance with ASME A13.1.
- Station outlets shall be marked to indicate their intended usage.
- Signs shall be posted, indicating clearly the location and identity of section shutoff valves.
3509.4 Manifolding of cylinders.¶
Oxygen manifolds shall not be located in an acetylene generator room. Oxygen manifolds shall be located not less than 20 feet (6096 mm) away from combustible material such as oil or grease, and gas cylinders containing flammable gases, unless the gas cylinders are separated by a fire partition.
3509.5 Identification of manifolds.¶
Signs shall be posted for oxygen manifolds with service pressures not exceeding 200 psig (1379 kPa). Such signs shall include the words:
LOW-PRESSURE MANIFOLD
DO NOT CONNECT HIGH-PRESSURE CYLINDERS
MAXIMUM PRESSURE 250 PSIG
3509.6 Clamps.¶
Hose connections shall be clamped or otherwise securely fastened.
3509.7 Inspection.¶
Hoses shall be inspected frequently for leaks, burns, wear, loose connections or other defects rendering the hose unfit for service.
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