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51313-02560-Improving the Durability of Cement Mortar Lined Pipes for Geothermal Applications

Product Number: 51313-02560-SG
ISBN: 02560 2013 CP
Author: Marita Berndt
Publication Date: 2013
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$20.00
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Service environments for piping used in geothermal applications are chemically and physically complex and typically aggressive. Cement mortar linings are applied to provide corrosion protection to steel pipes used for transportation of geothermal fluids. However the linings are susceptible to deterioration and have a finite life. Research was undertaken to improve the durability of cementitious linings and thereby increase the service life of lined pipes. Samples of mortar were exposed to simulated hypersaline geothermal brine at elevated temperatures. The mortar mix proportions and chemistry were varied and the performance compared. Protective treatments to the mortar were also explored. This paper describes the results of preliminary testing and provides recommendations on improvements.

Service environments for piping used in geothermal applications are chemically and physically complex and typically aggressive. Cement mortar linings are applied to provide corrosion protection to steel pipes used for transportation of geothermal fluids. However the linings are susceptible to deterioration and have a finite life. Research was undertaken to improve the durability of cementitious linings and thereby increase the service life of lined pipes. Samples of mortar were exposed to simulated hypersaline geothermal brine at elevated temperatures. The mortar mix proportions and chemistry were varied and the performance compared. Protective treatments to the mortar were also explored. This paper describes the results of preliminary testing and provides recommendations on improvements.

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