At what pressure is compressed gas considered safe, assuming a temperature of 70°F?

The consideration of safe pressure levels for compressed gases at a temperature of 70°F is guided by safety standards and guidelines pertinent to the storage and handling of compressed gases. Typically, a pressure of around 40 psi is regarded as safe for most common compressed gases under these conditions. This is because, at lower pressures, the risks associated with potential leaks or equipment failure are minimized, making it suitable for handling and storage without introducing significant risk factors to personnel or equipment.

Higher pressures, like those represented by other choices, can increase the risks of incidents, especially if proper safety protocols and equipment are not strictly followed. Therefore, under standard conditions, the choice indicating 40 psi is deemed the safest operational pressure. It aligns with widely accepted safety practices, providing a comfortable margin to ensure that systems remain stable and safe under normal operational conditions.