Doc. 35 Hygienic welding of stainless steel tubing in the food processing industry
First Edition, July 2006 - Abundantly illustrated, this paper provides guidelines for the correct execution of one-axis hygienic (sanitary) welding between pipe segments, or between a tube and a control component (e.g. valve, flow meter, instrument tee, etc.). It deals with tube and pipe systems with less than 3.5 mm wall thickness, built in AISI 304(L) (1.4301, 1.4306 or 1.4307), 316(L) (1.4401, 1.4404 or 1.4435), 316Ti (1.4571) or 904L (1.4539) and their equivalents. The requirements for a weld destined for hygienic uses are first described, then the possible defects which can affect the weld are listed, and at the end the procedure for a state-of-the-art welding execution is illustrated, including preparation of pipe ends, final inspection and a trouble shooting guide. It mainly refers to the part of the weld in contact with the finished or intermediate product.
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Hygienic welding of stainless steel tubing in the food processing industry | English Version