When using a cleaner to remove scale from boiler tubes, how can an operator prevent damage?

The most effective method to prevent damage when using a cleaner to remove scale from boiler tubes is to ensure that the cleaner does not remain in one location for an extended period. This is important because cleaners can be corrosive and may react negatively with the metal surfaces of the tubes if left in contact for too long. When the cleaner is allowed to move along the surface, it helps to evenly distribute the action of the cleaning agent and reduce the risk of localized corrosion or damage to the tube material.

In a cleaning process, maintaining movement allows fresh cleaner to constantly interact with the scale while preventing any build-up of chemical concentration in one area that could lead to pitting or surface deterioration. This practice is essential in protecting the integrity of the boiler tubes and ensuring a more effective cleaning process.

The other choices may not effectively contribute to the safety of the cleaning operation. Using higher concentrations of cleaning agents can increase the risk of corrosion, while cleaning during low pressure may not effectively enhance the cleaning action, and soaking tubes for prolonged periods could lead to unwanted chemical reaction and deterioration of the boiler material. Thus, ensuring movement of the cleaner is key to a safe and effective scale removal process.