C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
C23F 11/00 (2006.01) A01N 25/04 (2006.01) C23F 15/00 (2006.01) E02B 3/16 (2006.01)
Patent
CA 2494608
Atmospheric/ tidal zone area of offshore substrates such as pipelines risers, jetty timber piles, steel/ concrete conductors and structures & platforms members and legs, are usually protected against corrosion by painting/coating. Painting is usually extended to the intermittently wetted area/ splash zone area. The intermittently wetted area/ splash/ tidal zone area is defined as the area extending 1 meter above level of the Highest Astronomical tide and 1 meter below level of the Lowest Astronomical Tide. The continuously immersed area of steel substrates will not be painted/ coated as it will drive its protection from a cathodic protection system by means of immersed direct current or sacrificial anodes. Meanwhile the tidal area will not be able to drive protection from the cathodic protection system during the exposure period. By time, it will be essential to repaint/recoat splash zone area that can only be extended as is feasible by utilizing calm sea condition and working at low tide periods (length of the intermittently wetted area varies from location to another as it is dependent on local tidal ranges). However, there will be an area of the substrate that cannot be satisfactory coated but yet may not be continuously immersed during high sea state and /or periods of particularly low tide. Any uncoated area will be exposed to the harsh environment during low tide. Inability of the cathodic protection system to adequately function and protect the intermittently wetted area (splash/ tidal zone area) of offshore steel substrates has led to excessive wastage of wall thickness. In case of oil/gas pipeline risers, that situation will constitute a serious corrosion hazard and surely lead to environmental impact, risks and/or loss of revenue due to leaks developed from corroded area. In case of offshore structures, it leads to deteriorating structural strength and loss of integrity of offshore piles, conductors, structures and platforms. Splash zone of offshore substrates is not affected only by corrosion action/attack but also affected by effects of harsh environment such as tidal, wave and coastal actions, which cause them to erode/corrode over time. Timber/wood piles usually suffer from marine Borer attack and loose their integrity, if not properly protected. Long term corrosion/erosion protection is critical for the safe operating condition of offshore assets. In this invention, the splash/tidal zone is encapsulated, actively shielded by pre-shaped polymer spiral (coiled wrapping) and positively protected from external harsh environmental effects. The spiral when installed, forms a uniform barrier / shielding sleeve on the intermittently wetted area of offshore steel / concrete / organic substrates and the filling gel will continuously prevents the process of corrosion / bacteria attack of the substrate at splash/tidal zone area.
Na
Saro Mohei-Eldin M.
LandOfFree
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