Why Pump Seals Failure:
Pump Seals failures seem to fall into four broad categories:
Pump Seals motion restricted:
The spring-loaded (dynamic) seal face constantly moves to maintain full face contact with the stationary seal face. The main reasons for this movement are
Here are the major conditions that can restrict.. movement of the spring loaded pump seals face:
Thermal degradation of Pump Seal 0-rings:
0-rings are the one part of a pump seal that are sensitive to heat because of the way they are manufactured. The ingredients are mixed together, put in a mold and cured at high temperature for a specific time. The compound will then assume the shape of the mold and its hardness, or durometer, will increase. When the 0-ring is placed in an 0-ring groove in a seal and heated to a temperature beyond its recommended limit, the curing process will continue and the 0-ring will take a compression set. This means that the 0-ring has lost some of its resilience and squeeze, and fluid may leak past the 0-ring. The higher the temperature, the shorter the time before the 0-ring takes a compression set. When an 0-ring is exposed to high temperature for a long period, it will become hard and brittle, causing pump seals failure.
Since heat is often a problem and seldom helps the pump seal application, what can be done about it?
1. Use a balanced seal to minimize the heat generated by the seal.
2. Use low-friction face materials. Carbon vs silicon carbide is the best choice.
3. Use a clean liquid flush or product recirculation to carry away heat.
Pump Seal materials attacked:
When the correct materials are not selected,
1. The 0-rings may swell locking up the pump seal,
2. The pump seal faces may deteriorate rapidly, and
3. The metal seal components may corrode.
All can cause the pump seals to fail.
Mechanical seals installed incorrectly:
Many pump seals fail at initial start-up or prematurely because they were not installed correctly. Cartridge seals eliminate all measurement, protect the seal faces from contamination and are easy to install. With these seals, installation problems are minimized. The Outside seal is preset and requires no installation measurement. Only in-line seals require careful measurement to insure correct installation. By following the pump seals installation instructions ,step-by-step correct seal installation is easily achieved.
If you have any questions please contact us at: E-Mail about your pump seals applications.
Phone: 714-593-9780 Fax: 714-593-9701