MIL-S-6144A
3.2.3.3 Curtain, snap, quarter-turn, nylon tape, or flush latch fasteners
shall be used to attach and seal inspection panels within the installation. Where
inspection panels cannot be provided. the requirements of 3.2.2.5 shall govern.
3.2.3.4 The requirements of 3.2.2.4 shall apply where the insulating
material is provided enclosed in a bag or when in blanket form installed separate
from the rigid liner.
3.2.3.5 The requirements of 3.2.2.3 shall apply when rigidized insulating
material is installed separately from the rigid liner. Figure 2 (a) illustrates a
typical installation.
3.2.3.6 The requirements of 3.2.2.6 shall apply for the Type III installation,
except that the rigidized insulating material will be attached to the rigid liner in
lieu of the trim cloth. A typical installation in which the rigidized insulating
material is cemented to the rigid liner is illustrated in Figure 2 (b).
3.2.4
Appurtenant Fastening - Machine screws and self tapping screws
may be used to fasten auxiliary support structure such as brackets, crown rail
supports, and other similar items which need not be removed to effect removal of the
thermal-soundproofing installation.
Continuity - Breaks occurring in the continuity of an installation
3.3
such as a frame joint, shall be made acoustically leak-free with the minimum of
appurtenant materials. Juncture areas in Type I Installation shall be effected by
overlapping the edges of adjacent blankets and fastening per 3.2.1. Molding strips,
or equivalent items, shall not be used. Fastening, spacing and locating shall be
optimized so as to provide unaltered sealing characteristics after repeated removals
and reinstallation. In Type II and Type III Installation the scaling shall be inherent
in the configuration of the insulating material. Figure 2 illustrates optimum sealing
techniques for two typical installations using rigidized insulating material. Where
insulating material is provided in blanket form, blanket flaps of suitably enclosed
insulation shall be provided to wrap the frames between blanketed bags. See Figure
3 (a). Installations not amenable to frame-wrapping with blanket flaps may utilize
separate cap strips of suitably enclosed insulating material fastened to both sides of
the frame web. See Figure 3 (b). Fastening means used shall permit removal of the
cap strip without fastener or material damage.
3.4
Environment - Due consideration shall be given to the environment
to which the thermal-soundproofing installation will be subject. Specifically the
installation shall conform to the following requirements:
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