A few examples of Heat Exchangers Design / Analysis performed by Pressure Equipment Engineering Services, Inc. are as follows:

• Fitness for service evaluation was performed for a fixed tubesheet heat exchanger with flanged and flued expansion joint. The shell side of the exchanger had significant corrosion. The original shell side design parameters were 100 psig @150 °F and the original tube side design parameters were 50 psig @ 225 °F. The request was to see if both sides of the exchanger would be suitable for 600 °F. As a result of the significant corrosion on the shell side of the exchanger, the heat exchanger did not meet the TEMA thickness requirements. However, when mechanical integrity evaluation was performed, the exchanger was found to be fit-for-service satisfying ASME Section VIII, Div.- 1 requirements. It was also found that when both shell and tube side design temperatures are 600 °F, the thermal stresses are well above the code allowable stresses. After several iterations, it was found that the acceptable thermal stress levels can be achieved when the tube side design temperature is lowered to 520 °F. Hence, the heat exchanger was declared fit for service with the final shell side rating of 100 psig @ 600 °F and the final tube side rating of 50 psig @ 520 °F.

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