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|  MIL-S-24686A(SH)
3.2.5.2 Washer seal . The seal shall be provided by a teflon coated
Belleville spring washer under the shoulder of the orifice cap, in the counterbore
in the sprinkler frame. The basic design concept is illustrated on figure 2.
Washer seal design.
FIGURE 2.
3.2.6 Prel oad retention. The automatic sprinkler shall be chemically or
mechanically staked to maintain the manufacturer's assembly load. The preload
shall not be alterable by the use of common hand tools without causing visible
damage to the sprinkler.
3.2.7 Special tools. Special tools shall not be required for installation
and routine maintenance of sprinklers. Special tools are defined as those tools
not listed in the Federal Supply Catalog (copies of this catalog may be consulted
in the office of the Defense Contract Management Area Operations (DCMAO).
3.3 Materials.
3.3.1 Materials of construction on . Materials of construction shall conform to
table III for each component. If a material is not specified for a particular
component, the material selected shall be suitable for the purpose intended.
Furthermore , material for internal components in contact with the system fluid
shall be compatible with seawater, and materials for external components shall be
compatible with a marine atmospheric environment.
3.3.2 Coats and platinings. Automatic sprinklers shall not be plated or
ing i
coated. Paint shall be permitted only for the purpose of color coding/marking in
accordance with 3.6.
3.4
Performance.
3.4.1 General Automatic sprinklers shall meet all of the performance
requirements for quick response automatic sprinklers specified in ANSI/UL 199. In
addition, automatic sprinklers shall meet all performance requirements for
standard automatic sprinklers specified in ANSI/UL 199.
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