What seals are used when operating a pump under 200 degrees Fahrenheit?

In pump operations, particularly in contexts like those addressed in the Omaha NAPE Engineer Practice Exam, the choice of seal materials is crucial due to temperature constraints and the nature of the fluids being handled. Soft metallic packing or mechanical seals are highly suitable for temperatures below 200 degrees Fahrenheit. These seals provide a robust and effective barrier against leaks while maintaining performance reliability at moderate temperatures.

Soft metallic packing can adapt well to thermal expansion and contraction, which are key considerations when dealing with industrial fluids. Mechanical seals are designed to minimize friction and wear, thus enhancing the longevity of the pump system while providing excellent sealing capabilities under pressure.

In contrast, rubber seals may not perform effectively at higher temperatures due to potential degradation, and options such as wooden plugs and glass seals are generally not appropriate for pump operations due to material limitations in sealing effectiveness and structural integrity. Thus, soft metallic packing or mechanical seals stand out as the optimal choice for applications under the specified temperature threshold.