NEW APPROACH FOR EFFECTIVENESS CALCULATIONS METHOD ON BRINE REINJECTION PUMP SYSTEM AND ANALYSIS OF PIPE LEAKAGES AT LIQUID DOMINATED GEOTHERMAL FIELD

• Main Author: Taufiqurrahman
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85620
• Institution: Institut Teknologi Bandung

The liquid dominated Geothermal Field is the one of largest producing geothermal field in Indonesia with an installed power generation at unit-A with capacity of 55 MWe and brine outfield injection facility with cumulative brine injected at Well-X is 4,300 ton per hour. The migration from hot brine outfield injection system to cold brine outfield injection system in managing liquid disposal at liquid dominated geothermal field was adopted to minimize the operational brine injection pump problems due to the presence of silica sand (SiO2) deposition at Well-X. However, this attempt seemed not to be ineffective due to the intensive scale rate deposition. This study aims to simulate the performance of reinjection pumps due to scale deposition. The Aspen HYSYS V11 software was utilized to simulate the performance of the reinjection pumps and hydraulic analyses. The required input data for the calculation were pipe routing, bends, valves, and pipe elevation. The effects of impeller diameter and pipeline diameter changes due to scale deposition were evaluated. The result of the simulation was in the form of head 173,5 meter of the pumping system. The calculated head then was compared with the design head to evaluate the performance of the reinjection pumps. The simulation results showed that the changes in temperature & pressure in pipeline gave significant effects on the performance of pumps type BB1-HSB API 610. Wherein the HSB pump API 610 (ISO 13709) type BB1 is an axially split, single stage, horizontal force, and between bearing. And from the result of the analysis, the cause of the leak was due to there are regular indications of turbulent flow in the S-elbow bend, resulting in a friction factor that has an impact on the erosion rate of the material for the last 4 years. This condition causes a thinning rate in the elbow of 4,16 mm/year.