In the engine room of a vessel, you may find plate heat exchangers installed with fixed welded feet on the floor. The wave in the sea makes the whole ship body swing in rising and falling. The nuts of the plate heat exchanger may leap easily out of their position in some strong vibration environment. This is not good for keeping the tightened plates at the right dimension A and may lead to leaks. Thus when assembling the plate heat exchanger, double nuts at the back frame side is a way to fasten the nuts more strongly. On the other side, at the front frame, a welded metal sting stuck into the position of the bolts empty space, not leaving space for possible movement caused by vibration. The double tightening nuts to both sides of the frame is a flexible way to handle the strong vibration on board and make the safe operation of the plate heat exchanger.
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