Live Loading - Flange joints

Live Loading - Flange joints

The disc springs - Live Loading are an effective solution to the leakage of flange joints due to insufficient preloading of the bolts, when the specific pressure on the seals drops resulting in potential leaks.

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The disc springs - Live Loading are an effective solution to the leakage of flange joints due to insufficient preloading of the bolts.
  • Insufficient preloading of the bolts causes 50 - 80% leaks of flange joints!
As a result of rapid and significant changes in operating temperatures, there may be an increase and a consequent drop in the stresses in the bolts, i.e.increasing and decreasing pressure on the gasket. These sudden changes in pressure may result in additional deformation of the gasket, which is no longer optimally compressed after the temperature has stabilized and leaks can occur.
  • Disc springs are an effective solution because they are able to increase the elasticity of the screw connection.
Correctly designed disc springs are able to increase the elasticity of the screw connection 7 to 15 times! Experiences from refineries and petrochemical plants confirm that the use of disk springs in critical connections has proven to improve their tightness.

FLANGES SUITABLE FOR THE USE OF DISC SPRINGS

  1. Critical flange joints where the leakage of the media can cause an accident.
  2. Flange joints with wide temperature fluctuations.
  3. A bolt or a flange joint gasket relaxation is likely under operating conditions.
  4. Reoccurring leakage problems.
  5. Loosening of the bolts by vibrations.
Pokorny Company designs and supplies disc spring kits for critical flange joints.

 

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Comprehensive solution of flange joints

We offer comprehensive solution of flange joints – analysis, solution plan, materials delivery, professional assembly and tightness guarantee.

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Training – flange joints

We provide training according to EN 1591-4 Qualification of personnel competency in the assembly of the bolted connections of critical service pressurized systems.

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