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LowStress™ Lining
Edlon - Fluoropolymers
Technologies
Edlon's PureFusionTM LowStressTM lining technology was developed to combat demanding services providing ressistance at elevated temperatures.
Conventional industry fluoropolymer liner construction incorporates highly stressed areas in the liner.
This makes them vulnerable to stress cracking in severe hydrogen halide services at elevated operating temperatures.
Edlon® developed its PureFusion™ welded loose liners in a LowStress™ design, in order to overcome the issue of high temperature stress cracking. This significantly prolongs the lifespan of the liner under high thermal loading and highly aggressive environments.
Junctions between nozzles and vessel body liners are areas subjected to higher stress because of their geometries. This is true for designs of any type of material.
In typical industry lining fabrication, welds are located at the nozzle intersections which are areas of high geometrical stresses.
In contrast, with PureFusionTM lining design, the pure-fusion welds are located far from areas of high stresses.
In our exclusive design, the loose liner will be fabricated to line the full face on each of the body flanges and to line the raised face on all other nozzles.
- Hand welded nozzle connection
- Weld connects pieces at 90° right in radius
- Partial penetration weld
- Multiple weld passed prevent liner flexing - Higher stress
- Difficult to inspect weld for defects
- Machine fusion welded nozzle-no weld in corner
- Weld area outside of high stress 90° radius
- Full penetration weld
- No change in liner thickness allows joint to flex minimizing stress
- Easier to inspect weld for defect
Where operating at temperatures over 100°F, Edlon recommends using the LowStressTM design where all nozzles and manways are stress-relieved.
When combined, both technologies ensure an increased lifespan for the liner in hot HF and other aggressive services.
Edlon® PureFusion™ welding of a nozzle
Edlon® PureFusion™ welding of a nozzle to the liner body in a loose liner is shown above. Notice the position of smooth fusion welds away from the area of high geometric stresses. The same approach is followed with seaming body flanges.
This will allow for natural flex and strain, eliminating stress risers and minimizing the chance for stress cracking. In the LowStress™ design, nozzles are pre stress-relieved prior to welding.
