Refrigeration Plant Operator B Practice Test

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How is the packing gland lubricated in large ammonia refrigeration compressors?

By using a water cooling system
With a series of greased bearings
Using oil pumped to a lantern ring
Through automatic condensation removal

The correct answer is: Using oil pumped to a lantern ring

In large ammonia refrigeration compressors, the packing gland is lubricated using oil that is specifically pumped to a lantern ring. This method is effective because it ensures that the packing remains adequately lubricated, preventing wear and tear on the gland that can occur due to friction against the shaft as it rotates. The oil not only provides lubrication but also helps to seal the area to minimize ammonia leakage, which is crucial for maintaining system efficiency and safety. The lantern ring plays a vital role by allowing the oil to circulate around the packing, aiding in heat dissipation and providing a steady supply of lubricant to reduce operational problems. Having continuous lubrication is essential in preventing the packing from hardening or deteriorating over time, which can lead to increased wear and potential failure of the compressor. Other methods, such as a water cooling system, may be used for different cooling applications but not specifically for packing lubrication in ammonia systems. Similarly, greased bearings are typically used elsewhere in machinery rather than for packing gland lubrication, and while automatic condensation removal is essential for system efficiency, it does not directly impact the lubrication of the packing gland.