What type of cleaner is permitted for cleaning fittings used in medical gas work?

The correct answer is that trisodium phosphate or sodium carbonate is permitted for cleaning fittings used in medical gas work. This is because these substances are effective at removing grease, dirt, and other contaminants without leaving harmful residues that could compromise the integrity of the medical gas systems. Trisodium phosphate is a well-known cleaning agent that is safe for use in environments that require stringent cleanliness, like medical gas applications.

Using inappropriate cleaners could be detrimental. For instance, acetone can leave residues that may react with gas fittings or compromise their seals, while alcohol-based cleaners might not effectively remove all contaminants and could also leave harmful residues. Soap solutions may contain surfactants or other additives that could contaminate medical gases, which is why they are not recommended for cleaning fittings in medical gas work.