How are pipes coupled in spacecraft? I found Shape memory alloy pipe couplings (SCoup, see image taken from link) are sometimes used.
-Is this still the case and in what quantity are they used?
-What are the alternative coupling methods considering weight and reliability are constraints.
The 1976 NASA monograph Liquid Rocket Disconnects, Couplings, Fittings, Fixed Joints, and Seals defines "couplings" as
Couplings are manually actuated separable connectors that require more than a few seconds for engagement or disengagement.
and lists the following types:
Shape memory alloy is not mentioned, but that may be a newer development.
