1313.5 Air Sources.

Air sources for medical air compressors shall comply with Section 1313.5.1 or Section 1313.5.2.

(2) Automatic means to prevent backflow from all on cycle compressors through all off-cycle compressors. (3) Manual shutoff valve to isolate each compressor

from the centrally piped system and from other com

1313.5.1 Medical Air Compressor Source. The medical air compressors shall draw their air from a source of clean air. [NFPA 99:5.1.3.6.3.11(A)]

(3) Manual shutoff valve to isolate each compressor

from the centrally piped system and from other compressors for maintenance or repair without loss of pressure in the system. (4) Intake filter-muffler(s) of the dry type. (5) Pressure relief valve(s) set at 50 percent above line

pressure.

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(5) Pressure relief valve(s) set at 50 percent above line

pressure. (6) Piping and components between the compressor and

the source shutoff valve that do not contribute to

(6) Piping and components between the compressor and

the source shutoff valve that do not contribute to contaminant levels. (7) Except as defined in Section 1313.2.2(1) through

Section 1313.2.2(6), materials and devices used

Except as defined in Section 1313.2.2(1) through

Section 1313.2.2(6), materials and devices used between the medical air intake and the medical air source valve that are of any design or construction appropriate for the service as determined by the manufacturer. [NFPA 99:5.1.3.6.3.2 (2-7)]

If an air source equal to or better than outside air (e.g., air already filtered for use in operating room ventilating systems) is available, it shall be permitted to be used for the medical air compressors with the following provisions: (1) This alternate source of supply air shall be available

on a continuous 24 hours-per-day, 7 days-per-week

(1) This alternate source of supply air shall be available

on a continuous 24 hours-per-day, 7 days-per-week basis. (2) Ventilating systems having fans with motors or drive

belts located in the airstream shall not be used as a

Ventilating systems having fans with motors or drive

belts located in the airstream shall not be used as a source of medical air intake. [NFPA 99:5.1.3.6.3.11(E)]

2019 CALIFORNIA PLUMBING CODE 295

HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICAL VACUUM SYSTEMS any other purpose or distributed to any other persons or parties.

1313.5.2 Source of Dental Air Compressor Intake. Dental air sources for a compressor(s) shall meet the following requirements: (1) If the intake is located inside the building, it shall be

located within a space where no chemical-based

(2) They shall comply with Section VIII, “Unfired Pressure

Vessels” of the ASME Boiler and Pressure Vessel Code.

(1) If the intake is located inside the building, it shall be

located within a space where no chemical-based materials are stored or used. (2) If the intake is located inside the building, it shall be

located in a space that is not used for patient medical

(2) They shall comply with Section VIII, “Unfired Pressure

Vessels” of the ASME Boiler and Pressure Vessel Code. (3) They shall be equipped with a pressure relief valve, auto matic drain, manual drain, sight glass, and pressure indi

(2) If the intake is located inside the building, it shall be

located in a space that is not used for patient medical treatment. (3) If the intake is located inside the building, it shall

not be taken from a room or space in which there is

(3) They shall be equipped with a pressure relief valve, auto matic drain, manual drain, sight glass, and pressure indicator. (4) They shall be of a capacity sufficient to prevent the com pressor from short-cycling. [NFPA 99:5.1.3.6.3.6]

(1) The capacity to prevent short-cycling of the com pressor(s) (2) Compliance with Section VIII, “Unfired Pressure

Vessels” of the ASME Boiler and Pressure Vessel

(3) If the intake is located inside the building, it shall

not be taken from a room or space in which there is an open or semi-open discharge from a Category 3 vacuum system. (4) If the intake is located outside the building, it shall

be drawn from locations where no contamination

They shall be of a capacity sufficient to prevent the com pressor from short-cycling. [NFPA 99:5.1.3.6.3.6] 1313.7.1 Category 3 Dental Air. Receivers shall have the following: (1) The capacity to prevent short-cycling of the com pressor(s)

(2) Compliance with Section VIII, “Unfired Pressure

Vessels” of the ASME Boiler and Pressure Vessel Code [NFPA 99:5.3.3.6.1.2] 1313.7.2 Valves. A medical air receiver(s) shall be provided with proper valves to allow the flow of compressed air to enter and exit out of separate receiver ports during normal operation and allow the receiver to be bypassed during service without shutting down the supply of medical air. [NFPA 99:5.1.3.6.3.9(D)]

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(4) If the intake is located outside the building, it shall

be drawn from locations where no contamination from vacuum exhaust discharges or particulate matter is anticipated. [NFPA 99:5.3.3.6.1.5]