What are the L/O testing requirements for equipment without online purification?

The correct choice is the comprehensive option that includes all testing methods outlined for lubricating oil (L/O) that does not have online purification. This approach is essential as it ensures the integrity and cleanliness of the lubricating oil, which plays a critical role in the efficient operation of machinery and equipment.

The Clear and Bright test is a visual inspection that checks for clarity in the oil. Any cloudiness or discoloration could indicate contamination, making this test necessary for maintaining oil quality.

The Transparency Test evaluates the oil's ability to allow light to pass through, which is another indicator of potential impurities or degradation in the lubricating properties.

The Visible Sediment Test checks for any solid particulates or sediment at the bottom of a container of oil, which can signify contamination that could harm system components.

Testing using all these methods provides a thorough assessment of the lubricating oil, ensuring that any potential issues can be identified and addressed before they lead to equipment failure. Therefore, the requirement to perform all these tests is crucial for maintaining reliable operation in systems relying on lubricating oil without online purification.