In a pneumatic feedwater regulating system, how can control lines be checked for leakage?

In a pneumatic feedwater regulating system, checking control lines for leakage is effectively done by setting the control on reset. This method involves putting the system into a state where it can reveal any discrepancies or losses in pressure, which indicates a leak. When the control is reset, it allows the pneumatic system to stabilize, exposing any issues in the control lines that may not be evident during normal operation. By carefully monitoring the system during this phase, technicians can identify any leaks that may compromise the system’s effectiveness.

Other methods such as applying a vacuum or increasing the pressure can also be useful in leakage testing, but they do not offer the same accurate assessment of control line integrity as resetting the control system does. Visual inspections primarily check for visible damages or wear and do not provide a reliable means of detecting internal leaks or pressure drops within the control lines. Therefore, the reset method is the most effective for this specific context.