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Natural gas combi boiler.

A plant has a 10.5 MMBtu natural gas boiler that produces steam for process requirements. A combustion analysis test performed on the boiler showed that the oxygen content in the stack is around 7%. The boiler's feed water temperature is 185 degree F, and the stack temperature is around 650 degree F. The boiler is an older boiler, which has been operating in the plant for quite a few years, without a great deal of maintenance. The plant maintenance manager estimates the boiler load factor at 0.7

Professional engineer installing a natural gas boiler at home, he is checking the pipes