What is the maximum acceptable difference between pressure readings on the cylinder gauge and remote gauge?

The maximum acceptable difference between pressure readings on the cylinder gauge and the remote gauge is 100 psi because maintaining a consistent and accurate pressure reading is critical for safety in fire-fighting operations. In many scenarios, the pressure within a cylinder and the gauge reading can differ due to factors such as gauge calibration, internal wear, or even environmental conditions.

Setting the maximum variance at 100 psi helps ensure that firefighters have a reliable indication of the true cylinder pressure, which is crucial for making informed decisions about air supply during operations. A difference greater than 100 psi could potentially lead to misunderstandings regarding the remaining air supply, which can pose serious risks in life-saving situations.

The other options suggest smaller acceptable differences which may not account for potential variations in gauge accuracy and reliability. Thus, the 100 psi limit strikes a balance between safety and operational reality, allowing some tolerance for potential discrepancies without compromising the safety of the personnel involved.