Rapidly Attachable Fluid Transfer Interface

Rapidly Attachable Fluid Transfer Interface (RAFTI) is a standard interface developed by Orbit Fab for transferring fluids, e.g., propellants, in space.^[1] It has been defined by a group of 30 companies.

The interface specification has high and low pressure variants, both for operation between -40 °C and 120 °C.^[2]

• Low pressure : for MMH, UDMH, Water, H₂O₂, Methanol, Kerosene, Green Monoprops, isopropyl alcohol, HFE, N₂O. (fluids)
• High pressure : for Nitrogen, Helium, Xenon, Krypton. (gases)

History - timeline

2020: A first implementation is planned to be tested in space in 2021 as part of a prototype fuel depot.^[1][3]

A free flying orbital demo was launched in June 2021 to test transfers of high-test peroxide.^[4]

In 2024, Orbit Fab announced production ramp up and prices, and that three SpaceForce Tetra 5 satellites would be launched in 2025 with RAFTI interfaces for a refuelling demo in geostationary orbit.^[5]

See also

• Robotic Refueling Mission NASA tests on the ISS (including cryogenic)