Which device is commonly used to hold the packing in place and allow adjustment?

Which device is commonly used to hold the packing in place and allow adjustment?

• A. Lantern ring
• B. Impeller
• C. Packing gland
• D. Valve

Answer: (C)

Holding packing in place and providing the ability to adjust its tightness is the function of the packing gland. The gland surrounds the stem or shaft and, with a gland nut or screw, compresses the packing rings to form a seal. As the packing wears, you can tighten or loosen the gland to maintain a leak-tight seal and balance wear with leakage. The lantern ring is a spacer used to introduce lubrication and flushing around the packing, not to secure or adjust it. An impeller is the rotating part inside a pump that moves fluid, and a valve is the control device for flow—neither are used to hold packing or adjust its compression.

Holding packing in place and providing the ability to adjust its tightness is the function of the packing gland. The gland surrounds the stem or shaft and, with a gland nut or screw, compresses the packing rings to form a seal. As the packing wears, you can tighten or loosen the gland to maintain a leak-tight seal and balance wear with leakage. The lantern ring is a spacer used to introduce lubrication and flushing around the packing, not to secure or adjust it. An impeller is the rotating part inside a pump that moves fluid, and a valve is the control device for flow—neither are used to hold packing or adjust its compression.