support prosthodontic and orthodontic laboratories and Dental Treatment
Rooms (DTR's). For freestanding clinics with less than 5 chairs,
selection of central system for gases as opposed to point-of-use systems
shall be based upon life cycle cost considerations.
Medical Gas System Testing. Medical gas systems shall be
installed and tested in accordance with NFPA 99 (reference 9r). Testing
shall include, but not limited to, cross-connection, purity, pressure,
and alarm testing. All testing and certification of medical gas systems
should be done by an independent testing agency, not the equipment
supplier or Contractor.
System Control Valves. All medical gas centrally piped
systems shall be provided with shut-off valves and zone valve box
assemblies in accordance with NFPA 99 (reference 9r). Additional shutoff
valves shall be included as necessary to provide system section isolation
for maintenance or alterations.
Alarm Systems. Medical gas alarm systems shall be provided
for all central piped systems in accordance with NFPA 99 (reference 9r).
Gas System Sources (Storage). Gas system sources or storage
provisions shall be designed in accordance with NFPA 99 (reference 9r).
Flammable and nonflammable storage containers shall be stored in separate
enclosures. Bulk oxygen storage design shall be in accordance with NFPA
50 (reference 9r).
Point-of-Use Sources. Point-of-use cylinders are defined as
B, D, or E sizes. The Designer shall coordinate with the Using Service
the provisions for point-of-use cylinder storage when their use is
planned. Storage in the storage room for central system cylinder banks
is permissible. The point-of-use cylinder volume shall be included in
the total when determining the storage room ventilation requirements.
Design shall incorporate Compressed Gas Association requirements of
Pamphlet P-2 (reference 9t).
Alternative Compressed Air Sources. Alternative compressed
air sources such as pneumatic control air or shop air compressors shall
not be used as a source for medical compressed air, dental compressed
air, laboratory air, process air, or surgical handpiece drive air.
Color Coding and Labeling. Labeling and color identification
of piping shall be in accordance with NFPA 99 (reference 9r) and the
CGA Pamphlet C-9 (reference 9u). System components shall also be labeled
for identification to prevent tampering and inadvertent closing. In
particular, shutoff valves and pressure gauges shall be labeled in
accordance with NFPA 99 (reference 9r).
Medical Gas Systems Outlets. Appendix A contains guidance
for allocation and location of medical services and outlets in the
various spaces within an MTF. The number of outlets shown for each space
and for each medical gas service corresponds to usage in a large, full-
function medical facility, such as a medical center, comprehensive
healthcare center, or hospital. The amount represents the maximum
permissible number of outlets; the Using Service may specify less.
medical gas types shown for the given space are typically used; the Using
Service need specify not all. Smaller facilities may not require this
range or quantity of outlets. The Designer shall coordinate the gas
types and outlet quantities with the Using Service. Additional outlets
and gas types may be provided when justified by the Using Service to