Tim Hurley, GPT Industries, USA, explains how fiberglass reinforced epoxy products can be used to prevent galvanic corrosion in flanged piping systems.
A utility company operating out of the east of America approached GPT as they had encountered a leak and isolation failure following hydro-testing of their pipeline. The monolithic isolation joint (MIJ) they had installed had only been in service for one hour. This was not an isolated case, subsequently two more utilities companies approached GPT in short succession to report of similar failures during the installation and hydro-testing process. These failures occurred at various locations up and down the east coast of the USA.
An operator of an established Oil field in the UAE approached GPT after encountering the same persistent problem with its flange isolation gaskets (kit) across two sites. Two years after the initial installation of the isolation gasket the flanges began to leak. On closer inspection, this was not a unique incident. It was found that the conventional GRE (Glass Reinforced Epoxy) flange isolation kit (FIK) installed was experiencing a leak that was attributed to permeation of the media through the GRE retainer of the isolation gasket.
A multinational gases, technologies and services company was seeking an isolation solution for a pipe connection which had been prone to corrosion, the pipe carried Hydrogen and Nitrogen Gas, it was therefore required that the solution provided was fire-safe compliant and provided an extremely tight seal. They had the added complication that the connection was sited in an awkward position, vertically and close to the tank body.
A global oil and gas operator was seeking a gasket solution for a new offshore platform that was to operate in the Gulf of Mexico. The large-scale offshore platform which was being built in Asia required a lightweight high-pressure gasket for multiple sizes and pressure classes for various applications. Fundamental to their requirements was a solution that didn’t leave the core of the gasket exposed to the media, crude Oil, and sea water.
Pipeline operators based on the west coast of the United States started to notice that their flanges were beginning to experience shorts. Upon inspection it was identified that this was due to a buildup of minute metal particles travelling within the media.
A gas compressor manufacturer was looking for an insulation kit to be fitted to one of its compressors, located on an offshore platform within the Persian-Arabic Gulf. As the gas was of a sour nature, the isolation gasket had to withstand the highly corrosive operating conditions. Ensuring a tight seal was a must because of the potential for serious harm from leakage of the media.
An operator of an established Oil field in the UAE approached GPT after encountering the same persistent problem with its flange isolation gaskets (kit) at two sites. Two to three years after the installation of an isolation gasket that was recommended by an engineering consultant, the flanges began to leak. On closer inspection, this was a unique incident. It was found that the conventional GRE (Glass Reinforced Epoxy) flange isolation kit (FIK) installed was not compatible with the application.
Engineering firm had a refinery client that had a high temperature and pressure application that also needed to be fire rated.
An expansion device was being installed downstream of a control valve. This expansion device was made of SS316, while the upstream piping to the device was A106B, and the downstream tank connection to the device is 2205 Duplex SS. In this case, both the upstream and downstream connections are of dissimilar metals. Additional challenges for this application were that the flanges on the expansion device were a 6” Raised Face Slip on, while the upstream piping flange is a Raised Face Weld Neck SCH 160, and the downstream flange was Raised Face Weld Neck SCH XH.