Reducing the costly effects of maritime environments with polyurea

Marine environments, which are harsh and corrosive, are abrasive and corrosive to marine industry structures like offshore platforms, rigs and structures, and ocean-going vessels. All of these are significant investments for the companies that operate these structures. The structures that are in the marine environment are affected by corrosion and cost the industry billions every year for prevention removal, control, and rehabilitation.

The environmental conditions of offshore structures can be harsh on the surface coatings. The areas most affected are superstructure, decks as well as ballast tanks, and chains or anchor wells. They are exposed to salt as well as other chemical agents and are prone to abrasion caused by the movement of individuals and equipment. In an oil production drilling rig for instance the areas where 14-meter lengths of drill pipes are laid down, then dragged across the deck, and then pulled to allow drilling operations are susceptible to a significant amount of destruction. The majority of surfaces coatings are easily eroded away leaving exposed metal, which is prone to corrosion.

One method to reduce and limit the effects of certain types of corrosion is by using flexible surface coatings which are impervious to chemical attacks by the petroleum industry and its salts. Based on Denis Baker, special projects engineer at ArmorThane’s Australasia, “a corrosion barrier needs to be constructed with toughness and flexibility and be impermeable to the vast array of chemicals that impact marine structures.” The engineer says there is a way to reduce some of the consequences of drilling by using specific coatings on the surface. coatings or polyurea coatings can help protect marine structures within areas of oil as well as the natural gas industry from corrosion impacts, corrosion, and abrasion.

Polyurea coatings surface prep

To prepare work areas to be treated with a protective surface coating the platform deck must be abrasive-blasted to eliminate all existing coatings and to create an ideal surface for adhesion to the primer and protective coating. The zinc-rich primers are applied on the previously prepared metal surface. Over this, an elastomeric polyurethane primer or sealant is swiftly sprayed. Manufacturers have created coatings that are suitable for this kind of application as they lack volatile organic components (VOC) properties and can be quickly and easily applied. To ensure maximum protection the best choice is a pure polyurea is then spray-applied on the primer surface to an approximate thickness of 3 millimeters over the deck surface. The final coating is impervious to extreme weather conditions and is extremely flexible with extremely high impact strength.

“Pure polyurea is a relatively modern material that has grown quickly in the past fifteen years,” Baker says. Pure polyureas form by the reaction of a liquid isocyanate mixed under extreme pressure in an amine-driven resin. They are reactive due to their double-covalent bond which connects the carbon atom with oxygen and nitrogen atoms is easy to break and forms single bonds that are more stable in the hexagonal configuration within the carbon atom.

Flexible polyurea coatings

The most important aspect to consider when applying any treatment to structures is the need to limit the amount of downtime. Spray coating allows for faster application with less disturbance to the client’s activities, and the capability to walk across the spray-applied protective surface within minutes means that the facility will be up and running quicker. The appeal that is inherent to polyurea coatings is they set quickly, Baker says. The coatings “snap to cure” to form a firm surface in just a few seconds , and are able to be walked on with no harm in under an hour. “We can spray the coatings on and cure in less than six minutes.” Contrary to other coatings that are made of polyurea, the pure polyurea coatings aren’t affected by the ambient humidity or temperature as they are applied and their flexibility permits them to expand or contract of structure when temperatures change. Both of these are crucial aspects to consider when choosing to develop an offshore coating. Another benefit is the coating’s capacity to be sprayed up to 6 millimeters thick (and larger) on a sloped or vertical surface, without sliding or running. The resultant surface is simple to maintain, clean, and then recoat as needed.

Environmental aspects of using polyurea

When pipes and other equipment enter the deck areas of offshore structures it is essential that liquids don’t run through the pipes and into the sea below. Most offshore rigs will cover these holes with a rubber “boot” which is then taped to the pipe as well as the deck. But, the rubber in boots and adhesive may be damaged by UV or salt exposure over a period of months.

To prolong the lifespan of boots for deck penetration, to extend the life of deck penetration boots to extend the life of the deck penetration boots, the deck penetration boots can be protected with a protective coating applied. Pure polyurea is an ideal coating material that can be used alongside the boots. When applied with the thickness of 2 mm or more to the boot, and then extended to 50 millimeters on the pipes and then 100 millimeters on the deck, this kind of surface coating provides a liquid-tight weather-proof, flexible, and flexible surface for all deck openings ranging from 100 to a diameter. It also provides long-lasting endurance.

The butyl rubber as well as the steel surfaces that surround it are typically cleaned and scuffed, then the proper primer can be applied. It is crucial to ensure that all loose coatings oil, dirt, and dirt are properly cleaned prior to applying the new membrane. The pipes, equipment, and deck surfaces should be blocked off to protect against overspray.

Conclusion

Pure polyureas designed for spray application are generally made up of two components that are mixed at extreme pressure as well as temperature (~20.7 MPa at 65 degrees Celsius) inside a specially designed spray apparatus. When applied with a high-quality chemical cross-linking produces an extremely flexible but dense surface. The density of the coating is nearly impervious to abrasion as well as water and chemicals.