How water tube BOILER CAPACITY is effected AFTER PLUGGING SOME TUBES?

Answer 1

The reduction is capacity is roughly proportionate to the number of tubes that get plugged. For example, if you plug 4 of 200 tubes, the capacity will drop by about 2%.

This assumes that all tubes have the same heat transfer surface and it is a single pass boiler. If it is a multi-pass boiler, then it starts to depend which pass the tubes are on.

This is usually not a big deal as boilers seldom run at 100% capacity. You could figure this out by reviewing your boiler log and fuel consumption.

Answer 2

i agree with the above answer, the capacity is determned by the heat transfer area available, therefore reducing the heat transfer area by half , would roughly cut the capacity by half.