Proceedings of the 7th New Zealand Geothermal Workshop 1985. Corrosometer study of corrosion in Rotorua geothermal fluids. New Zealand Geothermal Workshop [7, 6-8 Nov. 1985, New Zealand].

Wells, D.B. Lichti, K.A.

1985

1067
CIENA

0-86869-065-1

Corrosion performance and reliability will be of primary importance in the specification of materials of new process equipment for the more efficient use of geothermal energy in Rotorua. Electrical resistance Corrosometer probes were used to evaluate the materials performance of three commonly specified alloys in a range of geothermal environments derived from wells in the Rotorua area. In addition a detailed study of the control valves being field tested by the Rotorua Geothermal Task Force was carried out to assess the reliability aspects of the materials exposed to the geothermal fluids. The performance of the test materials was found to be strongly dependent on fluid aeration. UNS G10100 carbon steel and C26000 brass exhibited low corrosion rates in non aerated fluids. The stainless steel alloy S31600 suffered pitting corrosion at high temperatures in aerated fluids. Control valve failures were attributable to inadequate corrosion resistance, scaling, and build-up of corrosion products /scale causing seizure. ABSTRACT. INTRODUCTION. GENERAL CORROSION CHEMISTRY. CORROSION RATE STUDIES. Corrosometer probe exposure conditions. Corrosometer probe results. DISCUSSION OF CORROSOMETER PROBE RESULTS. Non-acrated geohtermal fluids. Aerated geothermal fluids. Implications for Materials selection. CONTROL VALVE SURVEYS. SURVEY RESULTS AND DISCUSSION. CONCLUSIONS. ACKNOWLEDGEMENTS. REFERENCES.

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NUEVA ZELANDIA; ENERGIA GEOTERMICA; GEOTERMIA; FLUIDOS GEOTERMICOS; CORROSION; MEDICION;