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A plate heat exchanger is designed to give the best thermal efficiency, with a specific combination of high and low theta heat transfer plates. To maintain the correct duty it is very important that the same type of plates are used and are installed in the correct order. Each plate heat exchanger is supplied with a plate configuration sheet which contains all the relevant information for ordering spare parts and rebuilding the plate pack.
Below is every combination of transition plate, found in multi-pass plate heat exchangers. Each manufacturer has their own numbering format, we have only detailed the most common.