That would depend on the boiler - look on the boiler plate it will tell you the answer for that boiler there.
Totally depends on what the boiler plate is made up of. Normally this data is supplied to the welder operator.
It is the small space between two plates having water and at the other side of the plate hot gases are available to transfer heat to the boiler water. In fire tube boiler space between end plate and combustion chamber's end plate is called water leg.
A Borrowed Identiy - 1913 was released on: USA: 16 October 1913
now why the heck would anyone do that you hobo
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Boiler plate language.
In a boiler, pitting is dangerous because it weakens the boiler plate by reducing its thickness and strength. A pit that reduces the boiler plate thickness (at its weakest point) to 1/4 of the original thickness will fail at its Maximum Allowable Working Pressure. The weakest point is typically at the longitudinal joint (welded or riveted boilers) and pitting, grooving and cracking at this joint is closely monitored in all boilers.
A boiler, a teapot, and various scientific instruments I.e hot plate or Bunson burner
Spectroscopy.
Nationalism or patriotism.