Safety in the Plant
3411 (Encapsulating Membrane), specifically designed for the protection of flanges, fastenings and associated pipework. Belzona’s R&D chemist, Ruckseeta
Patel, describes the new technology: “This solution features the flexibility of elastomers but is based on a completely new technology excluding the use of isocyanates and toxic metal catalysts. The system bonds to manually prepared surfaces and does not involve hot work, making it safe and easy to use.” The coating offers full corrosion
protection due to its use with a corrosion-inhibiting base layer, Belzona 8411, and its high adhesive properties that exclude any moisture. The corrosion resistance of the
system has been proved by the salt spray test, used to assess a coating’s ability to resist attack from a continuous salt fog. The salt chamber converts a 5% sodium chloride solution into a hot fog at 35°C (95°F). The test piece consisted of an assembled flange joint, one side being bare steel and the other an existing paint system.
After 1,000 hours of exposure to the salt-fog atmosphere, no corrosion was reported under the encapsulated system. In comparison, the exposed steel part at the end of the flange showed a high level of corrosion. To provide a durable seal at the
application extremities and exclude any moisture, the system requires a good adhesion, particularly to manually prepared surfaces. Adhesion testing has been performed on three manually prepared substrates according to ASTM D429/ISO8510-1 St 2. The results have shown a cohesive mode of failure on all substrates. Another property of this new system
is the ease of access to the fastenings. When maintenance is required, the system can simply be cut open by a sharp knife. The membrane will then be peeled back with the bolt caps, exposing bolts and flanges. Once the required maintenance is complete, the membrane will fold back to its original position. n
Juan Lopez and Alice Jucquois are with Belzona Polymerics, Harrogate, UK.
www.belzona.co.uk/en/
Loss of containment, whether in chemical lines such as hydrocarbons and gas systems or water distribution lines, will have significant environmental, operational and commercial impact, and could pose a serious safety risk.
Due to the complexity of the flange geometry, it has become a challenge to design efficient solutions to protect flanges against corrosion.
WEKA AG · Switzerland Schürlistrasse 8 · CH-8344 Bäretswil Phone +41 43 833 43 43 Fax +41 43 833 43 49
info@weka-ag.ch ·
www.weka-ag.ch
ARCA Flow Group worldwide: Competence in valves, pumps & cryogenics
For more information ✔ at
www.engineerlive.com/epe
Visual Level Indicators
Tank Level Instruments
Cryogenic Components
Stainless Steel Valves
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