MarineLine® E-Newsletters

Profitable Tanker News about Marine Cargo Tank Coatings
Issue 21
2 in a 2-part series on Heat Curing
WHY a Fully Cured Cargo Tank Coating Matters For Long Term Performance

As presented in Part 1, Profitable Tanker Issue 20, APC’s unique heat curing system for MarineLine® has been built up over many years and millions of dollars to acquire the necessary infrastructure and heat curing equipment, and to develop stringent operating procedures, and to extensively train its operators. This is the ‘Gold Standard’ in the coatings business. This issue will show you some of the various steps employed by APC’s Heat Curing teams to bring about a final cure for a MarineLine® coating with a tightly knit, nearly impenetrable structure. Hundreds of ships coated around the globe have used this system.

Heat Curing Steps

APC’s heat curing system removes solvent entrapments in the MarineLine® coating and serves to fully activate polymer crosslinking, delivering a uniform cure of the entire coating application.

Prior to starting, tank dimensions and volume are taken into consideration when setting up the equipment. Next, a meeting is typically arranged at the shipyard prior to the arrival of APC’s heat cure crew to discuss the schedule and requirements of each party involved and the general parameters of the project. This will ensure that this process goes smoothly and all parties work together.

Heat Curing Steps - 1

Photo 1
During heat curing setup, long heat distribution tubes are fitted through suitable deck penetrations (butterworth, pump, or other openings). Photo 2 The heat distribution tube is shown inside the cargo tank. Photo 3 A standard high velocity burner, connected to a natural gas supply, Photo 4 is then inserted Photo 5 into the distribution tube. The burner unit is then connected to a high velocity fan Photo 6 that forces hot air down into the cargo tank where it is circulated. Photo 7 shows the multiple fans used in each tank. The operator has placed a number of thermocouples within the tank Photo 8 on the tank coating and these are then connected to the Control Booth Photo 9 on the deck where a computer Photo 10 and chart recorder reads and records the tank steel temperatures Photo 11 during heat curing. The forced hot air temperature is regulated at approximately 90°C to 110°C for six hours soak time to ensure the MarineLine® coating cross-links to provide superior chemical resistance. Photo 12 After removing the thermocouples, the cured MarineLine® coating is inspected throughout the tank and after approval, is now ready to immediately carry aggressive cargoes and other chemicals upon leaving the shipyard.

Heat Curing Steps - 2

APC/MarineLine® takes turnkey responsibility for the final curing of the coating as part of its ongoing partnership with its customers.

For more information on how MarineLine® coating can help your tanker operations, contact your MarineLine representative.