MIL-HDBK-1032/2
Protect structures against lightning damage
4.4.8
in accordance with NFPA 78.
Alarms. Provide hazardous chemical storage areas with alarms
4.4.9
signalling escape or spillage of stored chemicals.
Spill Containment and Control. Means of providing containment and
4.5
removal must be provided in the event of spills.
Dikes. Dikes shall be used for containment of spills for
4.5.1
commodities stored or handled outside of buildings. In accordance with
NFPA 30, their volume shall be not less than the greatest amount of liquid
that can be released from the largest storage container within the diked area.
4.5.2
Floor Trenches and Capture Systems. A continuous floor trench with
grating (see Figure 35) shall be used at all doorways for the capture and
control of hazardous chemical spills. All spill containment systems shall
provide separate containment as described in subparagraph 4.5.4. Secure grate
frame support channels to concrete floors. Grate design shall provide for the
ability to latch the removable grate sections at aisle crossings and cargo
doors to ensure that grates will remain firmly in place when material handling
equipment moves over them. The cross section of the grate frame members shall
be "Z-", rather than "L-", shaped so that two legs of the "Z" form a pocket
for grates and the third leg is in the horizontal plane at floor level, as
illustrated in Figure 35. This protects the edges of concrete around grate
frames from impact damage from the wheels of materials handling equipment.
4.5.2.1
Electronic Guide Wire Crossing. When floor-buried electronic guide
wire is used to guide material handling vehicles through trench grates that
cross aisles or are at cargo doors, use a nonmagnetic grate section extending
at least 6 inches (150 mm) on each side of the wire path so that the magnetic
field of the guide wire is not distorted by passing the wire through a ferrous
or magnetic grate. Alternatively, use slotted drains and pass the guide wire
under the drains and shield the guide wire when passing through ferrous or
magnetic grates or drains. Figure 36 illustrates typical crossing methods.
Personnel Exits. Raise personnel exit doors 6 inches (150 mm) above
4.5.2.2
the floor to prevent escape of spilled liquids. Where a trench passes in
front of a personnel door, use solid plates instead of grating to prevent a
fire in the trench from blocking the exit door.
Recessed Floors. When required for specific design or containment
4.5.3
needs, interior storage floor surfaces may be recessed 6 inches (150 mm) below
the level of adjoining dock, office, and support areas to prevent the flow of
spilled hazardous liquids into these areas. Vehicle access ramps shall be
provided at all doorways into such areas. The use of this method is
discouraged due to operational inefficiencies and the additional space
requirements caused by the ramps.
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