What are the respective reasons for the rise or fall in the liquid level of the buffer tank under the sealing flushing plan PLAN53C?
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What are the respective reasons for the rise or fall in the liquid level of the buffer tank under the sealing flushing plan PLAN53C? One of our company’s hydraulic turbines uses a flushing scheme based on PLAN32+PLAN53C. The isolation fluid buffer tank is equipped with high and low level alarms. Under what circumstances does the liquid level rise? What causes the liquid level to drop?
A small amount of isolation fluid is continuously injected into the sealed chamber, and this amount should gradually decrease; as a result, there will be a low-level alarm. When additional isolation fluid is added manually, an overlevel alarm will occur (that’s my understanding)
Low liquid level alarm: Natural loss of the buffer solution or damage to the sealing surface of the mechanical seal can both trigger a low liquid level alarm； High liquid level alarm: A fault occurs in the piston accumulator, causing the liquid in the seal chamber to flow into the accumulator, which raises the liquid level and triggers a high liquid level alarm. (Personal opinion)