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Pipeline Joint Anti-Corrosion Coating
Why Apply Anti Corrosion Coatings?
Anti-corrosion coating is applied to the external surfaces of assets such as rigid steel pipelines, spools, structures to avoid corrosion of the asset. This coating reduces the required thickness of steel to contain the product pressure, temperatures, flowrates and reduces the risk of failure, avoiding pollution and loss of production.
The cycle time to apply and cure the anti-corrosion coating for offshore assets, particularly field joints at spoolbases and onboard S lay and J lay vessels is critical. To achieve the fastest and reliable cycle times, training of the OJS application crew, selection of material properties (particularly curing time) and the design of equipment is essential.
OJS provides three types of external anti-corrosion coatings services:
Fusion Bonded Epoxy Applications (FBE)
Liquid Epoxy Applications (LE)
Heat Shrink Sleeves Applications (HSS)
Fusion Bonded Epoxy
The FBE Application System requires the steel pipe to be grit blasted to clean the steel and provide a profile to promote a bond between the steel and the epoxy. After blasting the area is pre-heated to approximately 230 degrees C and then the FBE in a powder form is applied to the area and overlapping onto the parent FBE coating.
OJS offers our High Speed FBE Application system which holds the world record for lay rate on offshore pipelines at 9.2 Km per day.
The LE Application System requires the steel pipe to be grit blasted to clean the steel and provide a profile to promote a bond between the steel and the epoxy. After blasting the area is pre-heated to the manufacturers recommended temperature (approximately 80 degrees C) and then the LE is brushed onto the steel exposed area and overlapping onto the parent anti-corrosion coating. Post heat can be used to cure the epoxy faster.
Heat Shrink Sleeves
The HSS Application System use products which are Polyethylene (PE) based. The HSS application requires that the steel area is cleaned and profiled using a power wire brush before pre-heating the steel with propane gas. The HSS is then manually applied and propane gas is applied, as post heating, over the external surface of the HSS. The HSS shrinks onto the coated area and overlaps onto the parent corrosion coating and creates a watertight layer reducing the risk of corrosion.
Densiflex®, Sea Sleeve®, and Deep Sea Sleeve® are registered trademarks of Offshore Joint Services, Inc.