Abstract: Conduits having cement-containing liners for the inner and outer surfaces of metal pipes include a fibrous material, such as glass fibers, to prevent cracking and/or inhibit crack propagation.

Abstract: A multi-piece, pipe joint seal has a slidable interface between seal pieces. The slidable interface allows for slippage between pieces during pipe joint assembly and disassembly, minimizing rotational and other stresses on the seal pieces and pipe sealing surfaces which may damage or endanger the deformable seal. The slidable interface seal is especially useful for joining brittle-lined pipe sections handling harsh fluids.

Abstract: A multi-piece, pipe joint seal has a slidable interface between seal pieces. The slidable interface allows for slippage between pieces during pipe joint assembly and disassembly, minimizing rotational and other stresses on the seal pieces and pipe sealing surfaces which may damage or endanger the deformable seal. The slidable interface seal is especially useful for joining brittle-lined pipe sections handling harsh fluids.

Abstract: A process is provided for using siliceous sludge (filter cake), obtained by precipitation of silica from silica-rich geothermal brine, to make a concrete material (geocrete). The process includes combining the sludge with a cementitious material, such as Portland cement and/or flyash and activating the cementitious material with an activating media. When water is used as the activating media, the sludge is preferably dewatered and the residual water content is determined, the entrapped brine adding to the water content of the mixture. The dry weight ratio of sludge to cementing material may be greater than about 3:1 and ratios as high as about 12:1 can be used to produce high strength geocrete.

Abstract: A method is provided for producing electric power from hot, pressurized geothermal brine containing dissolved toxic elements without significant precipitation of toxic solids. When sludge produced by the process is washed, non-toxic solids are produced which can be disposed of or utilized in an environmentally acceptable manner. The method includes removing geothermal brine from an underground aquifer, separating non-condensable gases therefrom, and handling the non-condensable gases separately from the processing of the non-condensable gas-free brine to prevent reactions therebetween. An air-free flashed brine handling system is established to prevent contact of air with the flashed brine, and all brine contacted with air is injected into the geothermal brine aquifer through a separate, corrosion-protected injection well. Steam derived from the brine is used to produce electric power, the steam being condensed in the process. The steam condensate is air-cooled, and is used in the steam condensation process.

Abstract: A method is provided for producing power from geothermal brine comprising dissolved toxic elements without significant precipitation of toxic solids. When sludge produced by the process is washed, non-toxic solids are produced which can be disposed or utilized in an environmentally acceptable manner. The method includes removing geothermal brine, separating non-condensable gases therefrom, and handling the non-condensable gases separate from the processing of the non-condensable gas-free brine to prevent reaction therebetween. An air-free flashed brine handling system is established to prevent contact of air with the flashed brine, and all brine contacted with air including condensate from steam turbines producing electrical power is injected into the aquifer from which the geothermal brine was extracted through the use of separate injection wells.

Abstract: A process is provided for using silicious sludge (filter cake), obtained by precipitation of silica from silica-rich geothermal brine, to make a concrete material (geocrete). The process includes combining the sludge with a cementing material, such as portland cement and/or flyash and activating the cementing material with an activating media. When portland cement is used as the cementing material, the activating media is water. In such case, the sludge is preferably dewatered and the residual water content is determined, the entrapped brine adding to the water content of the mixture. Preferably, the dry weight ratio of sludge to cementing material is about 2:1 to about 3:1; although, ratios as high as 9:1 can be used when high strength of the geocrete is not required. The preferred amount of water used is about 40 weight percent, including water content of the sludge, which may typically be between about 10 and about 30 weight percent.