The vessel is being manufactured in high strength carbon steel. Also, because the gas is classified as a sour service that is particularly corrosive and could cause cracking and other problems in carbon steel components, the specification calls for all internal wetted surfaces, flange faces, and a quick-closure door to be clad with a 3-mm corrosion-resistant coating of Inconel 625 to increase the life expectancy of the equipment. Arc Energy, which has recently opened a fabrication facility specifically to provide a complete supply service for weld-overlay-clad vessels, was able to offer to manufacture and overlay the pig receiver and, because carrying out all welding functions at the one location saved time and freed-up capacity at its own site, Pipeline Engineering took advantage of the offer.
