Seal Technology

Mechanical seal have been use in many kind of pumps like mechanical seal on centrifugal pump. Mechanical seal have been used for many years to seal any number of liquids at various speeds, pressures, and temperatures. Today plant operators are benefiting from improved seal technologies driven by the U.S Clean Air Act of 1990, and the American Petroleum Institute (API) Standard 682. These new seal technologies are based on advanced computer programs used to optimize seal designs, which are then verified through performance testing at simulated refinery conditions required by the API. The results to date indicate not only an improvement in emissions control, but also a major increase in equipment reliability.

Classes of Seal Technology
Emerging seal technology are providing clear choices for sealing. Various plant services require the application of these new technologies for emissions control, safety and reliability. Sealing systems are now available that are based on the preferred method of lubrication to be used.

These classes are as follows:

Contacting liquid lubricated seals:

Normally, a single seal arrangement is cooled and lubricated by the liquid being sealed. This is the most cost effective seal installation available to the industry.
Dual seals are arranged to contain a pressurized or non pressurized barrier or buffer liquid.

Normally this arrangement will be used on applications where the liquid being sealed is not a good lubricating fluid for a seal for emissions containment. These arrangements require a lubrication system for the circulation of barrier or buffer liquids.

Non contacting gas lubricated seals:

Dual non-contacting, gas lubricated seals are pressurized with an inert gas such as nitrogen.

Dual non-contacting, gas lubricated seals are used in a tandem arrangement and pressurized by the process liquid being sealed, which is allowed to flash to gas at the seal. A tandem seal arrangement is used on those liquids that represent a danger to the plant environment. For non-hazardous liquids, a single seal can be used.

There are many kind of pump can see on the refference here:

• Centrifugal pump
• Vertical Pump
• Diaphragma Pump
• Centrifugal Pump with Magnetic Bearing
• Reciprocating Pump
• Jet Pump
• Volute Pump