MIL-HDBK-1191
9.6.14.2
SHDA System Components. The system shall include one or more
compressors with provisions for automatic, alternate, and simultaneous
operation. Each compressor shall be sized to provide 65% of maximum
demand if any one compressor fails. Provide an alarm to indicate
compressor failure that annunciates to the master medical gas alarm
panel.
SHDA System Demand. The network demand shall be determined
9.6.14.3
according to the number of oral surgery DTR's in accordance with the
information in Table 9-8.
TABLE 9-8
SHDA UTILIZATION FACTORS
Network Demand L/s (CFM)
# of Oral Surgery DTR's
1-2
2.8
(6)
3-4
5.7
(12)
5 and over
1.42 per DTR
The compressor(s) shall be of sufficient output capacity to provide full
system recovery from minimum to maximum system pressure in 15 minutes or
less.
Medical-Surgical Vacuum System (MV). The medical vacuum (MV)
9.6.15
system shall be a centrally piped, dry vacuum system containing two or
more continuous duty pumps with a central receiver. The system shall
meet the requirements of NFPA 99 (reference 9r) and shall 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. The MV shall be used only for medical
9.6.15.1
functions involving patient care, therapy, and diagnostic functions as
described below. It may also serve DHV requirements for dental treatment
rooms and oral surgeries, and small laboratories in patient care areas
that function in direct support of medical functions. Analysis, research
or teaching laboratory located within a medical treatment facility may
also be served by the MV, provided that a separate system connection or
main is provided at the vacuum receiver, with a shutoff valve and trap
with a drain valve. A laboratory not supporting medical functions shall
have a vacuum system separate from the MV.
Demand. Vacuum system pumps and piping shall be sized in
9.6.15.2
accordance with NFPA 99 (reference 9r) "Recommended Vacuum Source Sizing"
and "Recommended Minimum Pipe Sizing." Note to "round up" pipe sizes,
especially those serving operating rooms including the risers and
laterals. Ascertain the intended staff operational procedures to
determine the need for an additional factor of safety. Indiscriminate
opening of vacuum inlets for extended periods, whether in service or not,
requires a factor increase in demand and pipe sizing. Also, the intended
use of "Y-connectors" as a means of increasing available inlets is not
recommended. A justified need for a vacuum inlet shall be accommodated
with another wall inlet, not an Y-connector. Verify with the User's
representative that the number of vacuum inlets proposed will support the
planned medical function operation without the use of Y-connectors.
9-23
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