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Section 3509 Piping Manifolds and Hose Systems for Fuel Gases and Oxygen
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The use of piping manifolds and hose systems shall be in accordance with Section 3509.2 through 3509.7, Chapter 53 and Chapter 5 of NFPA 51.
Piping shall be protected against physical damage.
Signs shall be posted for oxygen manifolds with service pressures not exceeding 200 psig (1379 kPa). Such signs shall include the words:
DO NOT CONNECT HIGH-PRESSURE CYLINDERS
MAXIMUM PRESSURE 250 PSIG
Hose connections shall be clamped or otherwise securely fastened.
Hoses shall be inspected frequently for leaks, burns, wear, loose connections or other defects rendering the hose unfit for service.