How long should you purge in low pressure?

In the context of purging in low pressure systems, a duration of 30 seconds is commonly accepted as an effective timeframe. This allows for sufficient time to clear out any potentially harmful gases or vapors from the boiler and associated piping before ignition.

Purging is a crucial safety step that ensures the combustion area is free from flammable gases, which could create dangerous conditions if ignited. The 30 seconds of purging helps to establish a safe starting point by ensuring that fresh air is introduced into the system, diluting any accumulated gas and reducing the risk of explosion.

While other durations might also be considered, 30 seconds strikes a balance between thoroughness and efficiency, ensuring operational safety without unnecessary delays in system startup. This duration aligns well with industry standards and practices, ensuring that operators can confidently proceed with ignition after this purging period.