What type of seal is a close-fitting bushing in which a liquid is injected in order to seal the process from the atmosphere?
A. Packing
B. Dry carbon rings
C. Liquid buffered seal
D. Labyrinth seal
A. Incorrect. Packing is used in reciprocating compressors to prevent leakage where the piston rod passes through the crank end of the cylinder.
B. Incorrect. Dry carbon rings are a low-leakage type of seal that can be arranged with a buffer gas that separates the process gas from the atmosphere.
C. Correct. A liquid buffered seal is a close-fitting bushing in which a liquid is injected in order to seal the process from the atmosphere.
D. Incorrect. A labyrinth seal is designed to restrict flow by requiring the fluid to pass through a series of ridges and intricate paths.
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