en
de
cn
Loose Lining
Edlon - Fluoropolymers
Technologies
Edlon's exclusive Loose Lining Technology has proven to be reliable in extremely aggressive services.
Because it is not bond to the metal structure of the vessel, it is inherently stable in highly permeable service.
Over time, all polymers (including fluoropolymers) will have chemicals permeate through their cross-sectional thickness driven by the concentration gradient of the chemical. For a given thickness of a fluoropolymer lining, the rate of permeation depends on a host of factors including: the nature of the permeating molecule, and the combination of temperatures, pressure, and duration. The rate will also depends on liner design and fabrication quality.
Although fluoropolymer barriers are highly effective in protecting substrate metals from corrosion, over time, small amounts of permeants will pass through the protection barrier. These permeants can be the source of premature failure of the lining systems if not managed properly.
When permeants pass through a lining and a metal substrate, they are channeled safely out so they do not change the system.
Special Solutions for HF Chemistry
Hydrofluoric acid (HF) can be especially challenging to handle with most materials of construction. Fluoropolymers have prove to be up to the challenge.
The key solution to ensure longer lifespan for liners is multifold:
- In HF-based service, at high temperatures, linings are best when loose and not bonded.
- Remove/reduce the stress risers from the lining system. Eliminate air-welds and any mechanical fixturing of the liners, especially near nozzles, manways and body flanges. These stress risers lead to premature failure.
- Edlon recommends using LowStressTM & Pure-FusionTM Loose Liners engineered for optimum performance at the given operating conditions. They have proven to prove years of service where little else works.
Fusion-machine welded construction provides smooth, indiscernible seams with tensile and elongation properties equal to those of the unseamed film itself.
Edlon's proprietary thermoforming techniques are used to make dished heads and other complex shapes. These processes limit the amount of hand welding, thereby increasing product reliability.
