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…showed last 75 words of 2195 total…external and easy to detect. The small refrigerant volume allows for rapid emptying and opening the unit. The faulty plate or gasket could easily be removed or replaced, and the plate pack quickly reassembled. Leakage in shell-and-tube chillers could go unnoticed for a long period of time, causing severe damage to the system, and take days for expensive repairs to be completed. Rolled threads and zinc plating the bolts gives a stronger, corrosion resistant thread.