Maximum tapered plugging tubes in heatexchanger

[paredanil]

Can anyone tell me, Talking about Heatexchangers, How many tapered plugging tubes can be in a Heatexchanger?

Theres a code or Engineering norm as TEMA, that apply in this case??

From Mexico I am writting

[johnboy]

As a 'rule of thumb' the maximum number of tubes that can be plugged is about 25% of the total number of tubes. Of course the number of tubes that you have to plug will depend on the delta T. If operations can survive with a certain temperature differential then that will determine the number of tubes that you can plug.