What is the minimal method for flushing soldering fluxes from the system as per ASTM B813?

The minimal method for flushing soldering fluxes from the system, according to ASTM B813, is the use of cold water. Cold water is effective in flushing out the soldering flux residues from a plumbing system after soldering has been performed. This is crucial in ensuring that any remaining flux, which may be acidic or corrosive, does not cause future damage to the piping or affect the quality of water being transported.

Cold water is typically readily available and safe to use in most applications. It ensures that the soldered joints are well flushed without the risks associated with high temperatures, such as damaging the soldered joints or unintentionally remelting the solder.

Other methods such as using hot water or alcohol can pose various risks. Hot water might be effective in some situations, but it can also compromise the integrity of the solder if applied too aggressively. Alcohol can be useful for cleaning purposes but may not be advisable for flushing a plumbing system as it can introduce other issues, including flammability and potential residue left behind. Compressed air might remove particles but does not effectively wash away the flux residues that cold water can.