MIL-DTL-24416C(SH)
3.6 Certification by Underwriters Laboratories, Inc. The wet chemical system and all associated component
equipment for extinguishment, splash, and discharge (distribution and time) shall be certified in accordance with
UL 300 as specified (see 6.2.e).
3.7 Workmanship. The wet chemical system and all associated components shall be uniform in quality and
evidence a level of workmanship that conforms to high-grade commercial practice for fire protection equipment.
Components shall be free from irregularities, defects, or foreign matter which affect their appearance or which may
affect their performance, durability, reliability, serviceability, or safety. Components shall be free of burrs,
scratches, chips, sharp edges, loose, or defective parts.
3.8 Special markings. All required markings shall be permanent and as follows:
3.8.1 Extinguishing agent cylinder. Cylinder shall be marked with the following information: Aqueous
Potassium Carbonate (name as it appears on MSDS sheet (see 6.3)); operating pressure of unit at room temperature;
hydrostatic test pressure and date; inspection instructions; maintenance instructions; and basic cautionary
instructions (first aid instructions.).
3.8.2 Discharge nozzle. Discharge nozzles shall be stamped with flow designation and tip part number.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall be performed on one complete wet chemical
extinguishing system when a first article sample is required (see 3.1). The inspection shall include the examination
of 4.4 and the tests of 4.5.1 through 4.5.5 (see Table I).
4.3 Conformance inspection. Conformance inspection shall include the examination of 4.4, 4.5.1, and 4.5.5
(see Table I).
4.4 Examination. A visual examination shall be performed on the installed wet chemical system and all
associated components. Wet chemical system and all associated components shall be examined for compliance with
requirements outlined in 3.2, 3.3.1, 3.3.2, 3.4, 3.6, 3.7, and 3.8 of this specification. This examination shall
encompass all visual examinations including compliance verification of system design and installation in accordance
with manufacturers UL approved installation and maintenance manuals. Noncompliance with any specified
requirements or presence of one or more defects shall constitute cause for rejection.
4.5 Methods of inspection.
4.5.1 Materials test. The requirements of 3.2 shall be verified by certification of conformance to UL 300,
NFPA 17A, and NFPA 96 (see 6.2.f).
4.5.2 Shock test. The shock test shall be conducted as follows: A wet chemical extinguishing system
incorporating all of the system components required for demonstration of compliance to UL 300 shall be assembled.
The assembly shall be affixed to a shock mounting fixture to simulate the worst case mounting location, plane, and
orientation for the installed equipment aboard ship. Fresh water may be used as the extinguishing agent charge
during the test. The assembly shall be subjected to a Grade B, light weight, Class I, Type A shock test in accordance
with MIL-S-901. The assembly shall meet the requirements of 3.3.3 after the test. Any change in system
components, parts, or fasteners shall require a retest unless otherwise specified (see 6.2.g).
4.5.3 Vibration test. After the tests of 4.5.2, the wet chemical fire extinguishing system shall be subjected to a
Type I vibration test in accordance with MIL-STD-167-1. The system shall not be actuated while being vibrated.
After verifying compliance of the pressure switches, the system shall be actuated to demonstrate its ability to
perform its function. The wet chemical fire extinguishing system shall meet the requirements of 3.3.4 after the test.
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