MIL-HDBK-1191
offensive odors and provides a means of access into the space for vermin
and insects. When utilized, automatic primers shall incorporate a
backflow prevention feature. Other means of trap prime maintenance, such
as using alternative sealing fluids (e.g. glycerin), are not permitted.
Retrofit/Alteration Considerations. The replacement of older
9.3.6
existing fixtures with lower-flow fixtures will alter system performance.
Smaller diameter pipe or increased slope may be necessary alterations.
Elevator Pit Sumps. Elevator pits shall be provided with a
9.3.7
sump, which shall be either pumped or drained by gravity. Pumped designs
shall deliver fluids to an indirect connection to the sanitary or storm
drainage systems, such as a floor drain. The sump discharge line shall
include a check valve to prevent back flow of fluid into the sump. If
permitted by the local jurisdiction, a direct connection to the storm
drainage system may be considered. Designers should also determine from
the base engineering office or local jurisdiction if an oil interceptor
is required. No other drains or sump discharges shall be connected to
the elevator pit drain or sump. This equipment shall be connected to the
alternative power source if one exists or is included in the project
scope.
Mercury Control. Facilities containing operations which
9.3.8
generate mercury wastes in the free or leachable (e.g. dental filling
amalgams refer to 9.6.17.1) state which are intended to be disposed to
the sanitary waste system, shall consider separation provisions in
accordance with federal, state or local requirements. The separation
provision shall be incorporated as close to the source point as feasible.
For mercury generating operations which do not require a separation
provision initially, provide a 0.2 square meter (2 square foot) floor
space with 0.67 meter (2 foot) clearance all around to accommodate a
retrofit installation.
Storm Water Disposal. Provide drainage and disposal of storm
9.4
water, direct or from runoff, from roofs and paved areas. The means of
disposal shall preferably be to an existing storm sewer. If an existing
storm sewer of sufficient capacity is unavailable, alternative means of
disposal, including such options as ponds, basins, or dry wells, shall be
considered. Storm water disposal shall be consistent with the
Installation's storm water management plan.
Prohibited Discharge. Storm water shall not be discharged
9.4.1
into sanitary sewers, unless it is rated as a combination system and no
alternative cost-effective means is available. When storm water is
discharged into a combination system, the connection at the point of
combining with the sanitary waste shall include a trap.
Sizing. Sizing of the storm water drainage system shall be
9.4.2
based on the guidance and precipitation rates shown in the NSPC or the
IPC (references 9a and 9b). When approved by the Design Agent, local
storm data may be utilized if based on U.S. Weather Bureau specified
sampling methods.
Fuel Gas Service. Applications for fuel gas utilization in
9.5
MTF's include fuel source for space heating, domestic hot water
generation, cooking, generation of steam for humidification and
sterilization, and as a point-of-use heat or flame source to support
medical and laboratory functions. The gas service for medical and
laboratory functions is discussed in the Medical Gas Systems portion of
this Section.
Fuel gas system design, including liquified petroleum gas
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