High-pressure CO2 fittings shall be what class?

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Multiple Choice

High-pressure CO2 fittings shall be what class?

Fittings for CO2 extinguishers must handle the high pressures these cylinders operate at, so the key idea is that the class rating of a fitting matches the maximum pressure it’s designed to withstand. The class rating is a standard way of labeling the pressure capability, with higher numbers meaning a higher allowable pressure. CO2 extinguishers operate well above the pressures of many other extinguishing agents, typically around 800–900 psi at room temperature, and the fittings need a comfortable safety margin beyond that. Class 600 fittings are rated up to about 1,480 psi at 100°F, which provides the necessary strength for CO2 service while staying within common standard practices. Lower classes (like 150 or 300) wouldn’t be sufficient for CO2’s high pressure, and while higher classes such as 900 exist, the standard and appropriate choice for high‑pressure CO2 fittings is Class 600.

Fittings for CO2 extinguishers must handle the high pressures these cylinders operate at, so the key idea is that the class rating of a fitting matches the maximum pressure it’s designed to withstand. The class rating is a standard way of labeling the pressure capability, with higher numbers meaning a higher allowable pressure. CO2 extinguishers operate well above the pressures of many other extinguishing agents, typically around 800–900 psi at room temperature, and the fittings need a comfortable safety margin beyond that. Class 600 fittings are rated up to about 1,480 psi at 100°F, which provides the necessary strength for CO2 service while staying within common standard practices. Lower classes (like 150 or 300) wouldn’t be sufficient for CO2’s high pressure, and while higher classes such as 900 exist, the standard and appropriate choice for high‑pressure CO2 fittings is Class 600.

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