What does N.O.W.L. stand for in boiler operation?

N.O.W.L. stands for Normal Operating Water Level. This term is crucial in boiler operation as it refers to the optimal water level maintained in the boiler during regular operation. Maintaining the N.O.W.L. is essential to ensure the safety and efficiency of the boiler.

If the water level falls below this normal operating level, there is a risk of overheating and damage to the boiler components due to insufficient water for effective heat transfer. Conversely, if the level is too high, it could lead to carryover, where water is entrained into the steam, potentially causing damage to equipment downstream and affecting process performance.

In summary, understanding and managing the Normal Operating Water Level is key for safe and efficient boiler operation.