Why Do Mechanical Seals Fail Prematurely?
- Category: Seal Talk... with Bill Herring
- Published: Thursday, 16 June 2011 15:24
- Written by Bill Herring
Mechanical seals, when correctly specified and installed, can provide years of maintenance free life for your rotating equipment. Applying mechanical seals to pumps and other rotating equipment is can save money and resources, reduced power consumption and reduces the pollution and leakage which occurs when other styles of gland sealing, for example, gland packing, are employed.
So why do some mechanical seals fail prematurely? Here are some of the most common reasons:
- Corrosion, abrasive or chemical attack by the product due to incorrect selection of build materials and elastomer’s, e.g. seal face, body, o/rings, gaskets etc.
- The highly polished and engineered seal faces are damaged prior to fitting due to poor handling or dropping the seal.
- Grease lubrication being applied to the seal faces: this is a definite no no! Seal faces are lubricated by the product being pumped or by an external flush compatible with mechanical seal.
- Incorrect compression: check with seal manufacturer for proper fitted length of seal faces.
- Dry running: Seal faces overheat causing failure which can be very costly. External flush to seal can illuminate this problem.
- The pump shaft is rotating eccentrically due to misalignment or bearing deterioration.
- Seals faces are contaminated by human contact: touching the seal faces can cause transmission of dirt which can be embedded in the seal faces.
- Tip: If you are experiencing problems with the life of your seals, let an experienced mechanical seal specialist take a look at your application. Contact Us