Universal Expansion Joints for Geothermal Power Plant in New Zealand

MACOGA has successfully designed and manufactured a series of Universal Expansion Joints for a geothermal power generation project in New Zealand, further strengthening its position as a reliable partner in demanding energy applications.

The scope includes four large 78” units (DN 1950) for turbine outlet piping and four additional 20” units (DN 500), specifically engineered to operate under demanding geothermal conditions, combining pressure, temperature, and continuous thermal cycling.

The larger units are designed for pressures up to 8.3 bar and temperatures up to 137°C, while the smaller units operate under high-pressure conditions up to 27 bar and temperatures reaching 202°C, highlighting the robustness and versatility of the design.

Manufactured with Alloy 625 (ASTM B443) bellows for the larger sizes and stainless steel 321 for the smaller units, combined with high-strength structural components, these expansion joints ensure excellent resistance to corrosion, fatigue, and pressure loads in geothermal service.

All units have been designed in accordance with EJMA standards and ASME B31.3, and manufactured under strict quality controls, including full NDT inspection and hydrostatic testing, guaranteeing long-term reliability in operation.

This project highlights MACOGA’s capability to deliver tailor-made expansion joint solutions for turbine outlet piping, supporting the efficiency and reliability of geothermal power generation worldwide