Corrosion Control

March 19, 2014
Collection of product and news annoucements focused on Corrosion Conrol

CoPipeline corrosion protection

Cortec Engineering & Field Service (CEFS) Laboratories said the VpCI® 637 TOL provides a cost effective solution for corrosion protection and combats corrosion in Top of the Line (TOL) applications. VpCI 637 TOL provides internal corrosion protection for gas flow and gas transmission lines. The product is a combination of vapor phase, neutralizing and film-forming corrosion inhibitors to combat corrosive attack from moisture and condensation, oxygen, carbon dioxide, hydrogen sulfide and other corrosive contaminants in natural gas. The firm said these non-emulsifying formulations offer the benefits of filming inhibitors that form a tenacious protective film on metal surfaces, neutralizing inhibitors that combat corrosive fluid formation and vapor phase inhibitors that reach areas inaccessible by direct contact to protect areas subject to varying flow ratios. VpCI 637 TOL provides maximum control over long distances for highly corrosive systems having a high ratio of water-to-hydrocarbons, including low areas in systems where water collects and extreme corrosive attack occurs. It will not cause foaming or upsets in gas sweetening or glycol dehydration processes and it does not contain heavy metals, chlorinated hydrocarbons, or volatile amines.

One coat resistance

Intech Services has released its DuPont™ Teflon® industrial coating that is a water-based, low VOC, coating with a corrosion resistance of up to 3,000 salt spray hours. Specifically engineered for coating off shore, chemical processing, and water treatment fasteners, the coating is targeted towards applications requiring outstanding corrosion resistance, anti-galling, and dry lubrication. Salt spray test results performed by a third party show excellent corrosion resistance even without surface pre-treatment, though the corrosion resistance can be enhanced if used with recommended primers and substrate pre-treatments. Fasteners with a zinc base coat of .3 mils passed ASTM testing of less than 10% red rust at 3,000 salt spray hours. Corrosion resistance can also be achieved without pre-treatments on aluminum steel and stainless steel substrates. Water based coatings can be applied to thicknesses of 1-4.5 mils. Curing temperatures of 450 improve the process with less bake time and energy required.

Corrosion control for crude unit overhead systems

Fouling and corrosion can threaten the reliability and safety of critical atmospheric fractionator overhead condensing systems. These problems often can impair production, raise maintenance costs and reduce profits. In addition, corrosion control is becoming more challenging as refiners around the world turn to lower-cost "opportunity" crude oil feedstocks and aim to maximize middle distillate production. Episodic pH variations in the overhead of the crude unit that are measured in the condensate water are often missed. This is mainly because spot testing is performed manually due to the lack of online, reliable data-gathering devices that can make adjustments to corrosion control chemistry in real time. As a result, GE has expanded its family of advanced automation and control technologies with TrueSense for Process, an online Crude Overhead Monitoring System (COMS). The system continuously monitors, applies and is designed to optimize the delivery of chemicals into the crude process stream to control corrosion. TrueSense for Process-COMS detects these pH variations quickly and rapidly minimizes their effects. Because undetected events can produce very high short-term corrosion, such a fast response helps to avoid unscheduled shutdowns, reduce maintenance expenses and improve profitability and operational flexibility. "Not only can we help to achieve lower corrosion rates with this technology, from an operational perspective, it's at a cost point that is a fraction of alternative approaches," said Adnan Mansour, monitoring solutions global product management leader, water and process technologies for GE Power & Water.

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