NFPA-99 Practice Exam

The standard gauge pressure of 160 / 185 psi is applicable to which of the following?

1. Laboratory air

2. Instrument air

3. Medical gas

4. Non-medical air

The correct answer is: Instrument air

The standard gauge pressure of 160 / 185 psi specifically applies to instrument air systems. This pressure range is established to ensure that sensitive instrumentation and control systems receive a consistent and reliable air supply that meets their operational requirements. Instrument air is often utilized in environments where precision is crucial, such as laboratories or manufacturing processes, and is typically treated to remove moisture and contaminants, thus making it suitable for pneumatic devices. On the other hand, laboratory air, medical gas, and non-medical air systems have different pressure and quality specifications. Laboratory air might not have stringent requirements, as it can vary widely based on the specific applications. Medical gases, like oxygen or nitrous oxide, have their own defined pressures and safety standards, making them distinct from the pressures applied to instrument air. Non-medical air systems could also operate under various pressures depending on their intended use, which does not conform to the same specifications as instrument air. Understanding the specific pressure requirements for instrument air helps ensure that systems operate efficiently and safely, illustrating how closely air quality, pressure, and application align in various contexts.