Leakage and pipeline resistance in U-tube heat exchangers

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The pre-column feed preheater in the 3+1 column distillation process has the vapor condensate from the reboilers of the pressure column and the recovery column on the tube side, and crude methanol on the shell side. Recent inspections revealed significant leakage in the tubes; to continue production, blind flanges have been installed at the inlet and outlet of the tube side. The problem is: if it is found during parking that 1/2 or 2/3 of the tubes in the tube side are leaking and need to be sealed, then with production continuing within the supply period, the resistance in the tube side will increase, which may prevent the temperatures in the pressure tower and the recovery tower from rising. Can holes be made in the pipe bank partition to reduce resistance? The size of these holes is related to the number of leak-sealing pipes; how should this be calculated? Heat exchange is not considered during this period.