What is the purpose of the seal buffer gas?

• A. To cool the pump casing
• B. To supply clean gas to the high-pressure side of a seal
• C. To lubricate rotating components
• D. To maintain pressure in the seal chamber

Answer: (B)

The purpose of the seal buffer gas is to supply clean gas to the high-pressure side of a seal. This is important because it helps to prevent the entry of contaminants that could potentially damage the seals and other critical components of rotating equipment. By providing clean gas, the buffer serves as a protective barrier, ensuring that the integrity of the seal is maintained, which is essential for efficient operation and longevity of the equipment.

In addition to protecting the seals, the clean gas can help maintain the correct operating conditions within the seal chamber, which is critical for proper sealing performance. It also prevents any process fluid from leaking out, thus improving the environmental compliance of the equipment and enhancing safety.

While cooling the pump casing and lubricating rotating components are important functions in the operation of pumps and other rotating machinery, they are not the specific roles of the seal buffer gas. Similarly, maintaining pressure in the seal chamber is a function of the entire sealing system rather than the buffer gas alone, underscoring the buffer gas's vital role in cleanliness and pressure support at the seal interface.