Effective Maintenance Painting Practices for Offshore Oil & Gas Structures – Part Two

From JPCL, February 2015

by Mark B. Dromgool, KTA-Tator Australia Pty Ltd

This article, the second in a two-part series, explains a three-pillar approach to achieving efficiency and cost savings in maintenance painting practices at offshore and FPSO structures. These procedures are not exclusive to offshore assets; they can be applied to onshore structures of all types where aged or damaged coating systems are found....
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Tagged categories: Maintenance coating work; Maintenance programs; Offshore; Oil and Gas; Paint application; Program/Project Management

Comment from Tarek Elhusseiny, (3/4/2015, 3:57 AM)

Mechanical Protection for Pipelines, Risers, Spools Assets, such as offshore pipelines, risers, spools or structures, may experience impact or abrasion after they have treated the external surfaces with an anti-corrosion coating. These impact loads or abrasions may occur during transport between the anti-corrosion coating site to the assets final location or during the installation phase (lifting equipment, assembly at spoolbases or on offshore vessel) or during pipeline operations (ploughing, trenching, fishing equipment, dropped objects etc). To reduce the risk of damage to the anti-corrosion coating, a second layer of material is applied to provide mechanical protection throughout the life of the asset. This protection can avoid the cost of intervention, a high cost in offshore projects in deepwater locations, One of these common activities is the Flame Spray Polypropylene which uses a “gun” to deposit polypropylene (PP) or polyethylene (PE) on top of the pre-coated area and builds up a consistent layer of protection similar to 3LPP or 3LPE parent coatings. The pre-coated area consists of a two layer system of 1) FBE and 2) chemically modified polypropylene (CMPP). The deposit of PP or PE by flame spray completes the 3 layer system replicating the parent coating 3LPP or 3LPE. PP or PE powder is fed by nitrogen into a gas flame within the flame spray gun. The gun is designed to both heat the powder (without burning) and accelerate the powder onto the coated area.

Comment from Dave Poolman, (7/8/2015, 9:39 AM)

Great article. Being responsible for 11 offshore platforms maintenance painting and welding, having proper supervision and training on each job site is the most important aspect of any project, in my opinion. We have hired our own field crews of welders and painters and supplement them with contractors as needed. That puts all of the responsibility on us for the work being done. It works.

Comment from luiz de miranda, (7/8/2015, 2:52 PM)

Very good article. Two remarks: 1)Corrosion is an Electrochemistry phenomenum and paints are "Chemical" ones, so that not ever a sound scheme of painture protect entirely the bare metal. More, rusting is just one of a lot of fifth others corrosion aspects. I saw a combination of rusting and stress-corrosion.2) Bayle´s Statistic could be employed more frequently into assesment of corrosion problems. Electrochemistry tests are ever wellcoming

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