| Title | IDDP valves refurbishment |
|---|---|
| Authors | Geir Thorolfsson, Sigrun N. Karlsdottir, Asbjorn Einarsson |
| Year | 2023 |
| Conference | World Geothermal Congress |
| Keywords | Geothermal, IDDP 1, IDDP 2, Expanding Gate Valves. |
| Abstract | During the Icelandic Deep Drilling Project, the two wellhead master valves on IDDP 1 well in Krafla both got stuck in open position on July 24, 2012. The valve stem broke in both valves. The valves had been in use for 2 years and 4 months, experiencing up to 142 bar pressure and 450°C. These two valves are 10 inches in diameter, expanding gate valves with Class 1500 body rating, but Class 2500 flange rating. HS Orka borrowed the valves from Krafla (owned by Landsvirkjun) and refurbished them before they were installed on the IDDP 2 wellhead on Reykjanes in 2018. In the current paper, the broken parts and their probable failure mechanisms are described. Material selection for the new parts, and the completed modifications are outlined. |