Download 5600 - FM Global

5600
April 2013
Following exposure to the moist ammonia environment for a period of 10 days, the samples shall be
removed, rinsed in potable water, and air dried. Following a minimum two-day drying period, visual
examination of the samples shall be made.
4.19.2.2
Austenitic, Ferritic, and Duplex Stainless Steel Parts (Boiling Magnesium Chloride Test)
Samples shall be degreased and exposed to a boiling magnesium chloride solution for a period of 500
hours, in accordance with ASTM G36, Standard Practice for Evaluating Stress-Corrosion-Cracking
Resistance of Metals and Alloys in a Boiling Magnesium Chloride Solution.
Samples are to be placed in a flask fitted with a wet condenser. The flask shall be approximately half
filled with a nominal 42 percent by weight magnesium chloride solution, placed on a thermostaticallycontrolled electrically-heated mantle, and maintained at a boiling temperature of 302 °F ± 4 °F (150 °C
± 2 °C).
Following exposure, the samples shall be removed and rinsed in potable water. Following a two-to fourday drying period, visual examination of the samples shall be made.
4.19.2.3
Parts Manufactured from Other Materials
Parts manufactured from other materials shall withstand comparable tests, based on the type of material
employed, at the sole discretion of FM Approvals.
4.20 High Temperature Exposure
4.20.1
Requirement
Components, such as nozzles, that are exposed to the protected space shall not show significant deformation,
blistering, or fracture following exposure to an elevated temperature as detailed in Section 4.20.2. In the case of a
nozzle, no cracking or distortion that would potentially alter discharge characteristics shall be allowed.
4.20.2
Test/Verification
The component shall be placed in an oven and heated to 1470 ± 20 ºF (800 ± 11ºC) for a period of 15 minutes.
Following this exposure, the nozzle shall be removed and promptly submerged in a water bath with a temperature of
60 ± 10 ºF (15 ± 6ºC).
4.21 Aging Tests – Plastic Materials
4.21.1
Air-Oven Aging Test
4.21.1.1
Requirements
Nonmetallic components, including valves, valve parts, siphon tubes and other parts subjected to the
flow of clean agent, and mounting brackets, shall be subjected to air-oven aging tests at 212°F (100°C).
There shall be no cracking or crazing as a result of this test. Subsequent to exposure, valves and valve
parts shall then be subjected to the requirements of Section 4.11 (Hydrostatic Pressure Test), agent
storage containers shall be subjected to the requirements of Section 4.9.5 (Hydrostatic Integrity), and
mounting brackets shall be subjected to the requirements of Section 4.7 (Mounting Device Test).
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