Causes:
1. Leaking filling valve
2. Leak in the steam line of jacket water pre heater, resulting in steam entering jacket water line
3. In some systems a valve is provided for directly injecting steam into jacket water line, a leak in such line (or the valve might be kept open) can also cause an increase in expansion tank level and a decrease in cascade tank level.
4. A crack in cylinder head can also cause bubbling and overflowing of expansion tank
1. Leaking filling valve
2. Leak in the steam line of jacket water pre heater, resulting in steam entering jacket water line
3. In some systems a valve is provided for directly injecting steam into jacket water line, a leak in such line (or the valve might be kept open) can also cause an increase in expansion tank level and a decrease in cascade tank level.
4. A crack in cylinder head can also cause bubbling and overflowing of expansion tank
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