Mobile Corrosion Test Facility Commissioning Trials, Geothermal Steam, 2 . 5 Wt% Gas

Abstract

DSIR has constructed a Mobile Corrosion Test Facility for short term corrosion monitoring trials at remote field sites. The facility was assembled to test the corrosivity of geothermal steam containing high levels of potentially corrosive gases, C02, H2S and NHj. Commissioning experiments were conducted using geothermal steam derived from Broadlands well BR22 containing 2.5% by $eight of gas in November/December 1984. Automated monitors were used to determine corrosion rates of carbon steel subjected to a range of simulated geothermal power station environments over short exposure periods. operational procedures were established for maintaining and monitoring the various test environments. limitations of automated monitors were identified and the need for immediate, on-site assessment of corrosion results was also indicated. During these and subsequent trials a Slow Constant Extension Rate Machine was also proved capable oftesting stainless steels for susceptibility to stress corrosion cracking. ing results will allow a realistic comparison of the existing Broadlands database of materials results with those obtained from subsequent high gas trials.