MIL-HDBK-1011/1
Section 13: SPECIAL CONSTRUCTION
13.1
Scope. This section covers pre-engineered buildings, recording
instrumentation enclosures, integrated ceilings and storage tanks.
13.2
General Design Considerations. For tropical areas with high
airborne salt content, pre-engineered buildings with factory-applied protected
coatings over galvanized steel for the roof and siding material are still
susceptible to rust and corrosion. Choose the protective coating with all the
prerequisites for a lasting material and project. Color fading, chalking and
pollution resistance are among the factors to consider. Metal type enclosures
for recording instruments will generally fall into the same category, though
by the very nature of the instrument package, the enclosure size may be quite
different. For factory-fabricated items, such as roofing and siding and
special enclosures, use items with a factory-finish with a baked-on coating.
13.3
Building Panels and Pre-Engineered Buildings. Specify a roofing
and siding material which has a long-life fluorocarbon finish.
13.4
Recording Instrumentation Enclosures. Specify factory-fabricated
enclosures for permanently installed recording equipment for measuring such
things as stresses in wind energy, solar energy, rainfall, earthquake effects,
and radio frequency levels, to protect them from salt conditions.
13.5
Integrated Ceilings. When design parameters allow or dictate the
use of an integrated ceiling, where the suspension system, the ceiling
material, the lighting and air conditioning are a homogenous unit, use the
design criteria for air conditioning in the tropical area. Additionally,
consider the guidance for the ceiling suspension system and tile in Section 9
in order to provide a maintenance-free and long-lasting integrated ceiling
system.
13.6
Shielded Enclosures. Use either galvanized steel or non-ferrous
metal elements in accordance with the recommendations in Section 5.
13.7
Storage Tanks. Wherever possible, situate metal storage tanks
above ground, out of direct contact with sand and soil. Where they must be
buried, consider using fiberglass or other non-metallic types. If underground
steel storage tanks must be used, assure that they are cathodically protected,
together with related pipelines.
(See Section 14.)
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