Final line pressure controls shall be sized to ___ of the peak calculated demand.

Final line pressure controls shall be sized to ___ of the peak calculated demand.

• A. 50%
• B. 100%
• C. 110%
• D. Not specified

Answer: (B)

The key idea is that the final line pressure control must be sized to meet the maximum demand that could occur at once. This regulator or control valve is responsible for delivering gas to all patient outlets at a safe, usable downstream pressure. If the device is sized to the peak calculated demand, it has enough capacity to handle the worst-case combination of outlets opening simultaneously, so the downstream pressure stays within specification and no patient outlet experiences inadequate flow. Sizing to less than the peak would risk pressure drops and insufficient supply during peak usage. Sizing to more than the peak adds headroom that isn’t necessary and increases cost without improving reliability under normal conditions. Therefore, matching the final line pressure controls to 100% of the peak calculated demand is the appropriate approach.

The key idea is that the final line pressure control must be sized to meet the maximum demand that could occur at once. This regulator or control valve is responsible for delivering gas to all patient outlets at a safe, usable downstream pressure. If the device is sized to the peak calculated demand, it has enough capacity to handle the worst-case combination of outlets opening simultaneously, so the downstream pressure stays within specification and no patient outlet experiences inadequate flow.

Sizing to less than the peak would risk pressure drops and insufficient supply during peak usage. Sizing to more than the peak adds headroom that isn’t necessary and increases cost without improving reliability under normal conditions. Therefore, matching the final line pressure controls to 100% of the peak calculated demand is the appropriate approach.