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Vessels converted to storage need extra corrosion protection

Written by Nick Blenkey
Nippon paintb Marine coating

Nippon Paint Marine's NOA60HS eliminates the risk of anti-corrosion coatings applied with low film thickness.

One impact of the Russian invasion of Ukraine has been an increasing interest in converting existing oil and gas carriers into FSUs and FSRUs as nations rush to get oil and gas from anywhere except Russia.

Nippon Paint Marine is advising shipowners and shipyards converting existing vessels into storage and production units to ensure the vessels’ fuel, water and cargo tanks are sufficiently protected from corrosion.

“We were already seeing increased demand for LNGC to FSRU conversions before the recent drastic disruption in oil and gas markets, but demand is now expected to exceed those initial expectations. We are seeing increased interest in countries considering storage and regas units to supplement and strengthen existing shore-based infrastructure,” said Niko Yamanoue, director, Nippon Paint Marine (Europe). “The cancelation of Nord Stream 2 is also likely to exacerbate demand for tonnage, but whether owners build new, recommission tonnage laid up during the offshore downturn or convert existing LNG carriers into FSRUs or FSUs, the performance of the protective coatings specified will be key to the commercial and technical success of these vessels.”

Noting that floating oil and gas storage facilities are frequently built to NORSOK standards, Nippon Paint Marine needed to offer certified coatings products, Yamanoue said, adding “these assets are designed with much longer service intervals than conventional vessels, and an effective and reliable long-life anti-corrosive coating is crucial to their safe operation.”

It was for the internal carbon steel tanks and pipework of offshore vessels and installations that Nippon Paint Marine’s unique self-indicating NOA60HS coating was certified in 2020 by the Norwegian Technology Standards Institution as meeting the requirements of the NORSOK M-501 standard.

“The NORSOK standards were developed in 1994 by Norway’s petroleum industry to ensure protective coatings were suitable in offshore oil and gas environments. The addition of NOA to the NORSOK M-501 approved product range marked a significant development in the structural safety of offshore vessels and installations, such as FSOs, FSRUs and FPSOs,” said Yamanoue. “NOA60HS eliminates the risk of anti-corrosion coatings applied with low film thickness, a contributory factor in corrosion influenced structural failure,” he said.

The anti-corrosion system incorporates a unique self-indicating technology developed to prevent incorrect application. If the coating appears transparent, then film thickness is incorrect. When it is opaque, the specified film thickness has been achieved.

“Correctly applied coatings to tank edges and corners, improves the structural integrity of internal spaces, providing greater protection,” Yamanoue noted.

A number of LNG carriers are already operating with NOA coating, with Nippon Paint Marine anticipating a rush of new orders as demand for gas ships and conversions heats up.

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