Hydrostatic testing is an important part of ensuring the safety and reliability of pipes, vessels, and other equipment designed for fluids. Running high pressure water through this type of equipment before it is put in service is a critical step to discovering any leaks or weak points present. This exercise can be made more cost-effective if it is conducted in offshore environments where there is ready access to an abundant supply of seawater. However, use of seawater poses a problem in the possibility of corrosion from the high chloride content of untreated seawater.

EcoLine image shipyardCortec Corporation has developed a bio-based corrosion inhibitor specifically designed for hydrotesting with seawater. The addition of Cortec’s EcoLine VpCI-642 allows seawater to be safely utilised without the danger of premature corrosive equipment failure. EcoLine VpCI-642 protects the ferrous metals in contact with the corrosive, high-chloride fluid by forming a protective layer on metal surfaces and inhibiting cathodic corrosion reactions.

Its low dosage of 0.3-0.75% by volume makes EcoLine VpCI-642 economical and cost-competitive, and this product is chiefly derived from renewable resources, containing 93% USDA certified biobased content. It provides an excellent replacement for more hazardous products containing nitrite, chromate, and hydrazine.

EcoLine VpCI-642 is biodegradable, with an environmentally friendly profile that makes disposal of large quantities of used hydrotesting water more likely to comply with local regulations. Once the treated water is drained, corrosion protection of the vessel can be extended by rinsing with fresh water containing 0.5% by weight of VpCI-609.

Nitrite and amine free, EcoLine VpCI-642 is not limited to hydrotesting and can be used as a low dosage treatment for a wide variety of other applications. This includes corrosion protection during wet lay-up of carbon steel vessels containing saltwater, brine, or high chloride/halogen-content water.


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