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| worst tube (In a boiler, there is a tube-to-tube temperature unbalance such that some tubes (so-called "worst tube") operate at a temperature higher than average Nik-On/Off) | |||
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| worst tube (In a boiler, there is a tube-to-tube temperature unbalance such that some tubes (so-called "worst tube") operate at a temperature higher than average Nik-On/Off) | |||