1305.1 Required Operating Pressures

Medical gas and vacuum systems shall be capable of delivering service in the pressure ranges listed in Table 1305.1.

276 2025 CALIFORNIA PLUMBING CODE

HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICAL VACUUM SYSTEMS

TABLE 1305.1

STANDARD DESIGNATION COLORS AND OPERATING PRESSURES FOR GAS AND VACUUM SYSTEMS

[NFPA 99: TABLE 5.1.11]

GAS SERVICE	ABBREVIATED NAME	COLORS (BACKGROUND/ TEXT)	STANDARD GAUGE PRESSURE
Medical air	Med Air	Yellow/black	50–55 psi
Carbon dioxide	CO2	Gray/black or gray/white	50–55 psi
Helium	He	Brown/white	50–55 psi
Nitrogen	N2	Black/white	55–185 psi
Nitrous oxide	N2O	Blue/white	50–55 psi
Oxygen	O2	Green/white or white/green	50–55 psi
Oxygen/carbon dioxide mixtures	O2/CO2 n% (_n _= % of CO2)	Green/white	50–55 psi
Medical–surgical vacuum	Med Vac	White/black	15 inch to 30 inch HgV
Waste anesthetic gas disposal	WAGD	Violet/white	Varies with system type
Medical-surgical vacuum/ WAGD combination	Med-surg/WAGD	White/black and violet/white	15 inch to 30 inch HgV
Other mixtures	Gas A% / Gas B%	Colors as above; major gas for back- ground/minor gas for text	None
Nonmedical air and dental air	––	Yellow and white diagonal stripe/black	None
Nonmedical vacuum and dental vacuum	––	White and black diagonal stripe/black boxed	None
Laboratory air	––	Yellow and white checkerboard/black	None
Laboratory vacuum	––	White and black checkerboard/black boxed	None
Instrument air	––	Red/white	50–185 psi

For SI units: 1 pound-force per square inch = 6.8947 kPa, 1 inch of mercury vacuum (HgV) = 3.386 kPa

1305.1 Required Operating Pressures — 2025 California Plumbing Code