Corrosion in boiler feedwater and condensate return systems is usually the result of dissolved gases, oxygen and ________.
Answer(s): B
Hydrogen blisters may form at many different depths from the surface of the steel, in the middle of the plate or near a weld. In some cases, neighboring or adjacent blisters that are at slightly different depths (planes) may develop cracks that link them together. Interconnecting cracks between the blisters often have a __________ appearance.
Answer(s): C
There is currently no known metal alloy that is immune to _________ under all conditions.
Low creep ductility is _____ prevalent at the lower temperatures in the creep range. Or low stresses in the upper creep range.
Answer(s): A
A hard, brittle surface layer will develop on some alloys due to exposure to high temperature process streams containing high levels of nitrogen compounds such as ammonia or cyanides, particularly under reducing conditions, is called _______.
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