By now we have studied the specific characteristics of various metals and non-metals: The mechanical and corrosive properties will help in selecting material for specific conditions that prevail inside a dairy plant. One must analyze the economics of material selected. A high material cost may be accompanied by ease in fabrication,hence, significant saving of labour during fabrication, or owing to long life of equipment. Sometimes compromise is made to select inferior material due to high cost of better material. Certain equipment are made with combination such that a good material is placed on the joint of product contact, while non-contact part could be made with other materials. Example is milk tank or milk tanker. Inner wall is made of stainless steel while outer jacket could be made with mild steel. Such type of grafting can be done with proper understanding only.
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