LDE SYSTEM UTILIZATION FACTORS
m2 (Sq. Ft.)
(# of inlets)
1 to 4
5.6 ( 60)
5 to 10
11 to 15
16 to 24
Waste Anesthesia Gas Disposal (WAGD). The WAGD system shall
be a centrally piped, dry vacuum system containing two or more continuous
duty pumps with a central receiver. It shall meet the requirements of
NFPA 99 (reference 9r) and be sized so that if one pump fails, the
remaining pump(s) can supply 100% of the total system demand. The system
design shall include automatic operation of the vacuum pumps including
alternating lead/lag status. Provide an alarm to indicate vacuum pump
failure that annunciates to the master medical gas alarm panel.
Applications. Disposal of waste anesthesia gas shall be
incorporated into the MTF design. Several means do exist, but vacuum
induced evacuation has demonstrated minimal interference with the medical
of dental functions. A MV, DHV, or DLV system may be used to scavenge,
collect, and dispose the waste anesthesia gas. Otherwise, a dedicated
vacuum system is used; it shall be designed in accordance with NFPA 99
(reference 9r). Inlets shall be provided in anesthesia locations.
Verify that the system vacuum pump is suitable for the high oxygen and
nitrous oxide exhaust content associated with anesthetizing procedures.
Demand and Performance. Designers shall coordinate with the
Using Agency the vacuum demand level and flow requirements.
Vacuum shall be exhausted in accordance with NFPA
99 (reference 9r).
Oxygen (OX). Oxygen (OX) is used in the gaseous state to
sustain life through direct delivery to the patient. Oxygen can be
stored as a gas in cylinders or as a liquid in bulk tanks. It is
classified as a nonflammable gas; however it can increase the range of
flammability of other materials and gases when present in sufficient
concentration. Its storage requires proper construction and ventilation,
in accordance NFPA 99 and NFPA 50 (references 9r and 9s). Oxygen shall
be supplied at a minimum of 345 kPa (50 psig) at all outlets with a
tolerance of +35 kPa (5 psig). The oxygen system shall not be used to
supply non-patient uses, including equipment in laboratories or medical
equipment maintenance/repair shops. Separate point-of-use services shall
be used for such non-patient applications.
Provision of Central Systems. When justified by the number
of required outlets and frequency of use, central oxygen storage and
distribution systems shall be provided, such as is typically the case
with medical centers, hospitals, and large ambulatory care centers.
Point-of-use ("roll-in") cylinders should be utilized for clinical
applications involving few oxygen outlets and infrequent utilization.
Emergency Connection. Provide an emergency oxygen supply
connection on the building exterior when the oxygen supply system is
located outside of the building. This connection shall be used as a