Understanding Simmerring Performance Limits

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In summary, the conversation discusses the use of different materials for simmerring based on the permissible speeds for the shaft to rotate. The shaft has a diameter of 20 mm and rotates at a speed of 1370 rpm, with the circumferencial speed calculated to be 1.5 m/s using the formula velocity = angular speed * shaft radius. The graph provided shows the permissible speeds for the shaft to rotate at, with the light gray region indicating the use of NBR material and the dark gray region indicating the use of FKM material. The blue region is not permissible for either material.
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An1MuS
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The diameter of the shaft is 20 mm, and the circumferencial speed is 1,5 m/s, which i calculated doing

velocity = angular speed * shaft radius

The shaft rotates at 1370 rpm.

The graph should give the permissible speeds for the shaft to rotate at that allow the use of the simmerring made of that material. NBR and FKM are two materials from which their simmerings are made.

Source: http://www.simrit.com/files/00001387.pdf , p.20
 
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The rpm lines are there as a convenience so you don't have to do the calculation you did yourself.

If your case is in the light gray region (which it is), you can safely use the NBR material. If it is in the dark gray region (and I presume the light gray region as well), you can use the FKM material. You cannot use either of them if you are in the blue region.
 
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Ahhh got it ! thank you very much
 

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