To prevent leakage at the point where the shaft protrudes through the case, ___ are used to seal the space between the shaft and the case.

To prevent leakage at the point where the shaft protrudes through the case, ___ are used to seal the space between the shaft and the case.

• A. Seals
• B. Geared rings
• C. Packing rings
• D. Compression fittings

Answer: (C)

Packing rings are specifically designed to create a seal at the point where the shaft extends through the casing of equipment, such as pumps or mixers. They are used to prevent leakage of fluids or gases and are typically made from materials that can withstand the operating conditions, including temperature and pressure variations. When installed properly, packing rings compress around the shaft, filling the gap between the shaft and the casing while allowing the shaft to rotate freely. This effective sealing action minimizes the risk of fluid leakage, which is critical for maintaining system efficiency and preventing environmental contamination. Other options, while related to sealing, do not fulfill the specific function of preventing leakage at a shaft. Seals might refer more generally to a range of sealing devices, geared rings are used in mechanical systems for transmitting motion or power, and compression fittings are used to join piping but do not provide a sealing function specifically for shafts. Thus, packing rings are the appropriate choice for addressing the sealing requirement at the shaft-casing interface.

Packing rings are specifically designed to create a seal at the point where the shaft extends through the casing of equipment, such as pumps or mixers. They are used to prevent leakage of fluids or gases and are typically made from materials that can withstand the operating conditions, including temperature and pressure variations.

When installed properly, packing rings compress around the shaft, filling the gap between the shaft and the casing while allowing the shaft to rotate freely. This effective sealing action minimizes the risk of fluid leakage, which is critical for maintaining system efficiency and preventing environmental contamination.

Other options, while related to sealing, do not fulfill the specific function of preventing leakage at a shaft. Seals might refer more generally to a range of sealing devices, geared rings are used in mechanical systems for transmitting motion or power, and compression fittings are used to join piping but do not provide a sealing function specifically for shafts. Thus, packing rings are the appropriate choice for addressing the sealing requirement at the shaft-casing interface.