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SEALS & GASKETS. FAILURE ANALYSIS OVERVIEW. The following presentation will provide you with a basic understanding of the most common causes of seal failure. Please call for assistance regarding specific applications or issues. Failure Analysis. Carbonized Lubricant. Solution

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seals gaskets

SEALS & GASKETS

FAILURE ANALYSIS OVERVIEW

The following presentation will provide you with a basic understanding of the most common causes of seal failure. Please call for assistance regarding specific applications or issues.

failure analysis
Failure Analysis

Carbonized Lubricant

Solution

  • Utilize a lubricant with higher temperature capability.
  • Problem
  • Carbonized lubricant can result when the lubricant temperature limits have been exceeded.
  • Degraded lubricant will deposit around the main sealing interface, hindering sealing capability.
failure analysis3
Failure Analysis

Fractured Element

  • Problem
  • Fractured elements can result from installation damage.
  • The element hinge is rolled over, causing element fracture or splits.

Solution

  • Verify whether the required shaft lead is present.
  • If shaft lead is insufficient, correct it, or use a recommended seal design to aid installation.
failure analysis4
Failure Analysis

Delamination

  • Problem
  • Delamination can develop as a result of air trapped in the element.
  • Material separation will reduce sealing capability.

Solution

  • Determine if the delamination is a result of improper installation;
  • If so, modify installation technique to eliminate future occurrence.
failure analysis5
Failure Analysis

Lack of Lubrication

Solution

  • Decrease internal pressure, allowing adequate lubrication to the primary sealing lip.
  • Problem
  • Lack of lubrication to the sealing surface can be a result of excessive internal pressure or insufficient lubrication.
  • Surface cracks or irregular wear patterns can develop.
excessive wear pattern
Excessive Wear Pattern

Problem

  • An excessive wear pattern can result from internal pressure, high misalignment / runout or an oversized shaft. A wide wear pattern will result in ineffective sealing.

Solution

  • Determine maximum operating parameters, and use seal design recommended for the application.
rolled sealing lip
Rolled Sealing Lip

Problem:

  • A rolled sealing lip is caused by improper installation or inadequate shaft lead. This could result in element fracture, and immediate leakage.

Solution:

  • Verify whether the required shaft lead is present. If shaft lead is insufficient, correct it, or use a recommended seal design to aid installation.
extended service
Extended Service

Problem

  • Extended service is typically a result of changing product requirements or modified maintenance planning. Increased lip wear will lower sealing capability.

Solution

  • Upgrade the seal design and element material for extended service capability.
spring delamination
Spring Delamination

Problem

  • Excessive deflection, elevated temperature or improper preparation can separate the spring and sealing element, causing leakage.

Solution

  • Upgrade to seal with additional shaft-to-bore capability. If temperature is elevated, use alternate sealing material to meet application requirements.
fluid degradation
Fluid Degradation

Problem

  • Fluid degradation is a result of incompatibility between lubricant or coolant and the sealing element material. Excessive swelling or element distortion will develop.

Solution

  • Verify application coolant and lubricants, then utilize recommended seal design and materials.
thermal degradation
Thermal Degradation

Problem

  • Thermal degradation typically results from increased temperature at the sealing interface. Breaks or cracks that develop on the primary sealing lip may cause leakage or contamination.

Solution

  • Upgrade the sealing element material to satisfy the application temperature requirements.
fractured carrier spring
Fractured Carrier Spring

Problem:

  • Fractured carrier springs typically result from improper installation, or undue distortion from excessive weight. Fracture or distortion of the carrier spring results in ineffective sealing.

Solution:

  • Improve installation technique, or utilize installation tools to eliminate future occurrence.