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Solutions > Problems Solved! CASE STUDY: Geothermal Power Plant
Background: US-Based CalEnergy's geothermal operations are located in Calipatria, California. They generate enough power to meet the energy needs of around 340,000 homes.
The Problem: The brine CalEnergy uses to generate geothermal power is one of the worlds most hostile. With chloride levels between 106,000 - 167,000 ppm, pH levels between 4.5 and 5.7, and temperatures from 550° to 600° F, the demands on the materials used are extreme. The second part of the geothermal process transports this brine through over 33,000 feet of production pipes. CalEnergy needed an economical alternative to Inconel 625 for its geothermal operations in Calipatria, California. A 340-ft trial production pipeline in 2507 was installed and after 13 months of production, no indication of stress corrosion, cracking or pitting was observed.
The Solution: PMIS knew that mill selection was vital to the success of a Super Duplex installation of this size and specification. PMIS was asked to provide technical support for CalEnergy's selection of a mill able to meet their severe Super Duplex 2507 needs. PMIS identified H. Butting GmbH & Co in Germany as the best solution for CalEnergy’s stringent technical requirements. PMIS, along with Butting’s sales office in Canada, supported CalEnergy throughout their trial. Consequently, CalEnergy placed their initial order for 30” Super Duplex 2507 pipe with Butting.
According to CalEnergy, the Super Duplex 2507 installation will be the largest ever in the USA. PMIS will continue to provide support to both CalEnergy and Butting throughout the installation process which is expected to begin January 2008.
CASE STUDY: Chevron Tahiti Project 2507 Super Duplex Pipe & Fittings
Background: Vessel manufacturer for Chevron Tahiti Project submitted invalid specification requirement for 2507 Super Duplex pipe and fittings bill of materials.
The Problem: Specification addressed both Duplex 22% Cr (UNS S31803) and Super Duplex 25% Cr (UNS S32750) with the same testing requirements.
The Solution: PMIS submitted research documentation detailing the different reactions for the separate material grades as well as suggested testing requirements for Super Duplex. PMIS specification was approved and adopted. <more details>
titanium
- duplex - super
duplex - 6%
moly - stainless
steels - nickel
alloys
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