Materials for Condensing Appliances (For Gas-Fired Heating Appliances)

摘要

A table is included which shows what sulfur content in natural gas is permissible for various materials under condensing conditions. According to the current Standard agreement for the supply and purchase of gas (the contract between N.V. Nederlandse Gasunie and the gas distribution companies), the total sulfur content is max. 150 mg S/m/sub e/ exp 3 . Within this contract specification two materials are possible: aluminium (wall thickness 2.5 mm) and stainless steel (AISI 316, wall thickness 0.9 mm). The effect of mechanical treatments and materials, such as chlorides, on the corrosion are not known. It is known that materials which build up a protective layer (self-passivation in aluminum and stainless steel) are vulnerable to local corrosion. (ERA citation 08:040205)