Optimal Nitrogen Filling Pressure for Seal Oil System Accumulator

Question:

Hello, I am encountering an issue with filling nitrogen in the accumulator as I am uncertain about the correct pressure to fill it at. The pump operates at 5.5 kg/cm2, with trip and alarm set at 3.4 and 4.4 kg/cm2, respectively. Can you provide expert advice on the optimal pressure for filling nitrogen in the accumulator? Thank you.

Top Replies

Hello Sunil, don't forget to scrutinize the pump curve's slope and determine the potential discharge pressure when the flow rate exceeds the rated level by 10-20%. It is crucial that the resulting pressure falls within the range of 4.4 to 5.5 kg/cm2 to ensure optimal performance.

Setting the nitrogen precharge pressure at 70 to 80% of the working pressure is recommended for optimal performance. For instance, if the working pressure is 5 kg/cm2, the nitrogen pressure should be between 3.5 and 4.0 kg/cm2. This ensures efficient operation and prolongs the lifespan of the equipment.

Typically, the pre-fill nitrogen pressure in most accumulators is roughly 90% of the pump's minimum operational pressure. In your case, with a minimum operational pressure set at 3.4 kg/cm2, you should fill your accumulator with nitrogen to around 3.1 kg/cm2. However, you should also consult with the manufacturer of the accumulator or your system design engineer to confirm the specific requirements for your machinery.

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Frequently Asked Questions (FAQ)

FAQ: 1. What is the optimal nitrogen filling pressure for a seal oil system accumulator?

Answer: - The optimal nitrogen filling pressure for a seal oil system accumulator would generally depend on the operating conditions and specifications of the system.

FAQ: 2. How does the pump operating pressure affect the nitrogen filling pressure in the accumulator?

Answer: - The pump operating pressure, along with the trip and alarm set points, play a crucial role in determining the optimal nitrogen filling pressure for the accumulator.

FAQ: 3. What are the implications of filling nitrogen at incorrect pressures in the accumulator?

Answer: - Filling nitrogen at incorrect pressures can lead to operational issues, decreased efficiency, and potential safety risks within the seal oil system.

FAQ: 4. Should the nitrogen filling pressure be adjusted based on specific system requirements or operating conditions?

Answer: - Yes, it is advisable to adjust the nitrogen filling pressure based on the specific requirements and operating conditions of the seal oil system to ensure optimal performance and safety.

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