What is the recommended practice when sampling fluids from transformers with a specific gravity greater than 1?

Sampling fluids from transformers, especially those with a specific gravity greater than 1, should be done from the top. This is because fluids with a higher specific gravity tend to separate, with denser materials settling at the bottom and lighter materials remaining at the top. The fluids at the top can provide a better indication of the transformer’s condition and oil quality, as they are less likely to contain particulates and contaminants that may have settled.

By sampling from the top, you can obtain a representative sample that reflects the operational status and potential issues within the transformer. Taking samples from the bottom would likely yield sediments and sludge that do not represent the overall condition of the fluid in use. Therefore, sampling from the top is aligned with best practices to ensure accurate analysis and assessment of the transformer's fluid.