Protecting North Sea supply vessel

Citation

(1999), "Protecting North Sea supply vessel", Anti-Corrosion Methods and Materials, Vol. 46 No. 5. https://doi.org/10.1108/acmm.1999.12846eab.011

Protecting North Sea supply vessel

Methods

Protecting North Sea supply vessel

Keywords Jotun, Coatings, Marine environments, Corrosion prevention

The supply vessel Skandi Stord, recently built at the Astilleros y Servicios Navales SA (Asenav), Valdivia, shipyard (Hull No. 122) for service in the North Sea, is reported to be protected by Jotun Paints' coatings (Plate 3).

Plate 3 The supply vessel Skandi Stord is protected by Jotun Paints' coatings

Owned by District Offshore ASA, Norway, the vessel is equipped for oil recovery, fire fighting and standby duties. With a length overall of 73.5m, breadth moulded 16.4m, depth moulded 8.0m and a draught of 6.9m, her dead-weight is 2,900 tonnes. The Skandi Stord has a service speed of 15 knots and a full speed of 17 knots.

In close co-operation with the owners, Asenav chose Jotun coating systems to provide protection against corrosion, abrasion arid fouling. The coating contract was won by Industries Ceresita SA, the Jotun group's Santiago-based Chilean company.

Jotun manufactures a range of marine coatings and, using carefully chosen products from this range, systems were formulated to give protection for the differing working areas on board the Skandi Stord.

For the hull below the waterline, the Jotun system comprised "Jotamastic 87" epoxymastic, "Safeguard" coal-tar epoxy, and self-polishing anti-fouling "Seamate HB".

"Jotamastic 87" can reportedly be applied in high film thicknesses to give very good resistance to water, solvents and many chemicals. With a low solvent content and no isocyanate, this product claims a much reduced environmental impact, and it is said to comply with current NORSOK standards.

Anti fouling "Seamate HB 99" was specially developed for stationary structures, low-activity vessels and high-fouling areas. The standby functions of the Skandi Stord made her a suitable recipient.

The topsides, superstructure and decks of the supply vessel also benefit from treatment with "Jotamastic 87" but, in these cases, the protective system was completed with "Hardtop AS" polyurethane topcoat which boasts excellent gloss and colour retention. On the decks, the "Jotamastic 87" is preceded by "Penguard Primer", which is an epoxy primer based on a high molecular-weight epoxy resin claiming very good resistance to many chemicals and solvents.

Jotun has a great deal of experience in the protection of ballast tanks, and "Balloxy HB Light", its state-of-the-art specialist coating was chosen for the Skandi Stord. A modified epoxy treatment with good penetration, this product is also said to be free from the hazards of isocyanate and coal tar. "Balloxy HB Light" is not only light in colour to help application and inspection in dark restricted spaces, but also offers visual control over both mixing and applied thickness.

The interior of the engine room of the vessel is treated with "Mammut Primer" and "Mammut Top Coat". These high-build, urethane-alkyd coatings form a system which is stated to be certified not to spread surface flame.

Liquid mud, recovered-oil and sewage tanks of the Skandi Stord are treated with "Tankguard HB", a high-build epoxy coating with a high resistance to a wide range of solvents.

Details available from Jotun-Henry Clark Ltd. Tel: +44 (0)171 481 2741; Fax: +44 (0)171 265 1836; E-mail: linda.diamond@jotun.co.uk or Stein Kjolberg, Jotun Paints. Tel: +47 33 457000.