Which of the following pressures is considered dangerous for using fuel gas?

When working with fuel gas, pressure levels are critical for ensuring safe operations. A pressure of 15 psi is considered dangerous for fuel gas because it exceeds the typical operating pressures for most fuel gas systems. These systems are generally designed to operate safely within much lower pressure ranges, and higher pressures can increase the risk of leaks or catastrophic failures.

In the context of fuel gas operations, pressures greater than 15 psi can lead to heightened risks of equipment rupture, improper functioning of valves, and difficulty in maintaining control over the gas flow. This can create hazardous situations, potentially leading to fire or explosion risks if gas accumulates in an uncontrolled manner.

Understanding the hazards associated with various pressure levels helps workers maintain safety standards and abide by regulations that are meant to protect both personnel and property. It's crucial to adhere strictly to safety protocols that dictate the maximum pressure levels allowable for fuel gas operations.