(API 682 Type A)
The latest generation high pressure API 682 50-series mechanical seal is designed for high pressure applications, such as crude oil, hot water, light hydrocarbons, including VOCs, at oil producing, oil tranportation, oil refineries and petrochemical plants, power plants. Depending on the application, it is made single, tandem or double.
50 - series seals are used for the same applications as the followings seals:
H7/H75/SH by Burgmann Germany
QBQ/DHTW by Flowserve, USA
8B/59/58/RREP by John Crane, USA
Typical applications include
High pressure capability
Tests show that a traditional seal has leakage rate of 150-250 ml/hour at 50 bar, 3000 rpm, oil 35°C. Why? Because of high pressure, seals faces bend, and the small gap between the faces goes out of parallel. The gap becomes conical. Because of this, the fluid film in the gap does not act as in a sliding bearing anymore. Friction and wear encrease. It is clearly seen during testing: when the test rig is swithed off, the shaft stops immediately because of high friction. And when the seal is disassembled after an 8 hour run, initial wear is already seen on the faces.
In the 50-series seal, faces have been carefully designed using FEA (finite element analysis). The good results are immediately seen during testing: when the test rig is swithed off, the shaft rotates for 8-10 seconds because of inertia (it points to low friction). And when the seal is disassembled after an 8 hour run, NO initial wear can be seen on the faces. Leakage rate is as little as 15-30 ml/hour at the same 50 bar, 3000 rpm, oil 35°C. The leakage rate is 10 times less!
Special hard faces available
|Temperature||From -50 up to +315°C|
|Dynamic Pressure||Up to 200 bar|
|Static Pressure||Up to 330 bar|
|Linear Speed||Up to 50 m/sec|
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