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All gaskets are thoroughly inspected for signs of aging, cracking or chemical attach Any plates that have cracks or show signs of corrosion, deformation from swollen gaskets or over-tightening are replaced Damaged plates are removed in pairs to maintain the critical plate pattern in the unit After washing, the plates may be sent to a plate-and-frame heat exchanger service center for reconditioning (including chemical cleaning, if needed) and dye penetrant inspection, and a failure analysis on damaged plates or gaskets. The reliability-based strategy is based on the fouling models discussed earlier and an additional risk level which represents the probability of plates being fouled to a critical level. The authors present equations that give a good idea of how often the heat exchangers should be cleaned based on different assumptions of the quality of cleaning or breaks in operational time where the maintenance is possible. These equations use known statistics of heat exchangers and use a probability function to determine this frequency. The first case assumes that the cleaning is perfect and the heat exchanger is returned to its original performance level while the second case assumes a lowering of the performance based on the original due to imperfect maintenance. The third case assumes that the heat exchanger will be under a scheduled maintenance shutdown periodically and increases the risk level accordingly to account for the window of possible cleaning. The cost-based cleaning strategy uses the same fouling models as before to predict a median time to reach a critical level when the heat exchanger will quit functioning properly and what that level of fouling will be. This model includes the cost per hour of the off-line cleaning, the cost of chemical cleaning and the cost of additional fuel consumption based on the loss of heat 30PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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