What acid cleaning method is used onboard ship for coolers?

Sulfamic acid cleaning is the preferred method used onboard ships for cleaning coolers due to its effectiveness in removing scale, rust, and other deposits without harming the metal surfaces. It is a strong acid that is specifically effective against calcium carbonate and other types of scale typically found in cooling systems. Moreover, sulfamic acid is less corrosive compared to other acids, making it safer for use on various metals and alloys used in ship components. Additionally, it has the advantage of being safe to handle and less hazardous, which is crucial in a shipboard environment where safety protocols must be followed carefully.

In contrast, hydrochloric acid is generally more aggressive and can cause significant corrosion to metal surfaces if not carefully controlled. Sodium hydroxide is a caustic alkali that is not typically suitable for removing scale in coolers, as it can react unfavorably with the materials commonly found in heat exchangers. Acetic acid is also not as effective for scale removal compared to sulfamic acid, and while it has its applications, it is not the standard choice for cleaning coolers onboard ships.