Operators of geothermal facilities in Iceland, Indonesia, and the U.S. are installing high‑nickel alloy steel pipe for brine injection and production lines to combat corrosive, silica‑rich fluids. These specialized steel pipe grades, such as 254SMO and Inconel‑lined variants, withstand high temperatures (up to 200 °C) and aggressive chemistry, extending asset life well beyond conventional carbon steel alternatives.
At Iceland's Hellisheiði plant, engineers replaced 6 km of 8‑inch carbon steel pipe with duplex stainless steel pipe, reducing corrosion rates from 1 mm/year to less than 0.02 mm/year. The investment was paid back within three years via decreased downtime and maintenance costs for hot‑leg replacements.
Indonesia's Salak geothermal field, operating at 230 °C, selected clad steel pipe with internal Inconel 625 liners to transport brine to binary cycle units. The composite steel pipe provides the backbone for efficient heat exchange while resisting erosion from entrained particulates.
In the western U.S., new greenfield projects in Nevada are leveraging galvanized steel pipe with fiber‑reinforced polymer coatings to simplify installation and lower capital costs. These steel pipe lines deliver competitive performance in lower‑enthalpy zones, broadening the geographic scope of geothermal development.
With global geothermal capacity set to grow 6% annually, the demand for specialized steel pipe in high‑temperature subsurface applications will continue rising, ensuring reliable, low‑emission power generation from Earth's heat.
