A. Burning of the crown sheet and flues and perhaps cause an explosion.
Q. Would you turn feed water into a boiler in which the water was very low?
A. Never, without first pulling the fire or covering it with dry ashes and allowing the steam to go down.
Q. If you allow water in the boiler to get too high what would be the result?
A. It would cause priming or foaming.
Q. Is priming or foaming dangerous to an engine?
A. Yes. It may cause breaking of cylinder head and wrecking of the engine.
Q. What are other causes for foaming or priming of a boiler?
A. Dirty and impure water.