Understanding Simmerring Performance Limits

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SUMMARY

The discussion focuses on the performance limits of Simmerring seals, specifically for a shaft with a diameter of 20 mm rotating at 1370 rpm and a circumferential speed of 1.5 m/s. The materials analyzed are NBR (Nitrile Butadiene Rubber) and FKM (Fluoroelastomer), with performance regions defined in a referenced graph. Users can safely utilize NBR in the light gray region and FKM in both the light and dark gray regions, while neither material is suitable in the blue region.

PREREQUISITES
  • Understanding of shaft dynamics and circumferential speed calculations
  • Familiarity with Simmerring seal materials, specifically NBR and FKM
  • Knowledge of performance graphs and their interpretation
  • Basic concepts of rotational mechanics and RPM
NEXT STEPS
  • Review the performance graph for Simmerring seals in the provided source
  • Investigate the properties and applications of NBR and FKM materials
  • Learn about the impact of circumferential speed on seal performance
  • Explore alternative sealing materials for different operational conditions
USEFUL FOR

Mechanical engineers, seal design specialists, and anyone involved in the selection and application of Simmerring seals in rotating machinery.

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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