Brazing shall be carried out in accordance with British Refrigeration Association Specification for Brazing and BS 14324:2004. Brazing rods shall be cadmium free and conform to BS/EN 1004:1999 .At all times, when brazing, a small amount of dry nitrogen must be purged through the pipe to prevent oxidation and scaling internally. Any component susceptible to heat during the brazing process that may be damaged must be protected. Soft solder shall never be used for jointing of refrigeration pipe work.