Resource Library

Technical Papers

Development of a 125 kW AMB Expander/Generator for Waste Heat Recovery

The development and testing of an integrated power module (IPM) for a waste heat recovery system is described. The IPM is part of a waste heat recovery system based on the organic Rankine cycle.

Magnetic Bearing Actuator Design for a Gas Expander/Generator

A magnetic bearing system for a high-speed cryogenic gas expander generator is presented. The expander represents a new class of such devices that, in contrast to the earlier technologies, makes use of the expanding gas energy by converting it into electrical power.

Design and Shop Testing of a 165 kW Cryogenic Expander/Generator on Magnetic Bearings

A low cost cryogenic expander system that incorporates a high performance, high-speed permanent magnet generator and low loss magnetic bearings is described.

Test Results and Analytical Predictions for Rotor Drop Testing of An Active Magnetic Bearing Expander/Generator

A cryogenic gas expander system that incorporates a high-performance, high-speed permanent magnet, direct-drive generator and low loss magnetic bearings is described.

Design and Prototype Test Data for a 300kW AMB-supported Turbine Generator for Natural Gas Pressure Letdown

A 300 kw integrated and fully-sealed turboexpander-generator for natural gas pressure letdown (pld) was developed by baker hughes, a ge company (bhge), in conjunction with calnetix technologies.

Product Brochures

FreeSpin In-line Turboexpander

Sapphire Technologies’ FreeSpin® In-line Turboexpander (FIT) recovers the energy lost in pressure letdown and liquefaction processes.

Driving Global Decarbonization

Our vision is to improve the way the world harvests and utilizes energy.


POWERGEN 2023 - HUBS Recording

Explore how turboexpander-generators (TEGs) create clean electricity by recovering unused energy in pressure letdown processes. A focus will be placed on how novel technologies can be integrated into TEGs to differentiate them from traditional rotating equipment offerings.

GPA Midstream 2022 Presentation

Sapphire and Evolve partnership creates a solution that can recover power throughout a midstream sector, which research shows is currently wasting up to 2,900 megawatts of pressure energy.

Explainer Video

Hydrogen and natural gas are pressurized to facilitate efficient transportation in pipelines across long distances.


Hydrogen Gas

Hydrogen is a rapidly expanding global energy storage market. Hydrogen is used in many manufacturing processes from petroleum refining to food processing.

Natural Gas

Sapphire Technologies designs, develops and manufactures highly engineered FreeSpin® In-line Turboexpanders (FIT) for natural gas processing and distribution systems.