Loss of lubrication __________.

• A. Is a major cause of seal damage
• B. Is not a major cause of seal damage
• C. Has no effect on seals
• D. Causes immediate seal failure

Answer: (B)

The main idea here is how lubrication affects seal life and what factors typically cause seal damage. Seals rely on a lubricating film to minimize friction, wear, and heat between the sealing surfaces and their surroundings. In many systems, the fluid being pumped or processed provides this lubrication, and the lubrication system helps keep that film intact.

Loss of lubrication is not viewed as a primary, direct cause of seal damage because, on its own, it tends to produce wear and heat more gradually rather than causing an immediate, catastrophic failure. The most frequent and direct contributors to seal damage are issues like improper installation or seating, misalignment, excessive gland or clamp pressure that can squeeze or damage the seal, contamination from particulates or chemicals that attack the seal material, and extrusion or pressure-related deformation of the seal. These factors have a more immediate or obvious impact on the integrity of the seal than a lack of lubrication alone.

That said, losing lubrication can still hasten wear and shorten seal life if the lubricant film collapses or dry-running conditions occur, so maintaining proper lubrication remains important. The emphasis in maintenance practice is on addressing the stronger, more direct causes of damage, while ensuring the lubrication system is functioning to support the seal’s longevity.