Corrosion monitoring access fitting materials are chosen primarily for compatibility with the vessel material on which they are installed. In corrosive environments, this subjects the seal seat areas and the threads to the same corrosive environment as the vessel. After years of service, these areas may corrode and present a potentially unsafe situation. This is especially common on bottom-of-line installations. To address this problem, Rohrback Cosasco Systems has developed a line of patented internal corrosion monitoring access fittings. By using an insert made of Hastelloy® C276, the seal seat areas and threads are protected from corrosion damage. Hastelloy® C276 is a strong passive film forming material. Consequently, as a cathode in a galvanic cell, it tends to pass very little current. This tendency and the large anode-to-cathode area ratio eliminates galvanic corrosion. These internal corrosion monitoring fittings were subjected to rigorous independent testing by a major middle east oil company and their test results proved the merits of this design. During the test, the pipe incurred a high rate of pitting and general corrosion, while the corrosion controlling COSASCO® fitting incurred no significant corrosion damage. This oil company saw that the Hastelloy® C276 sealing surfaces and threads protected the access fittings from virtually all oil field environments. The company concluded that these severe service access fittings should have a service life which extends far beyond the life of any carbon steel pipes in which they are installed.
Rohrback Cosasco’s corrosion control products stand up to the harshest of corrosive environments. Request a quote today!
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