Loss of seal and tube blow out are two of the main concerns if ferrules don’t perform correctly. These actions, provided by the ferrule(s), are the most important functions when it comes to surviving pressure, temperature, and vibration. Both styles are highly engineered and designed with metal property science, called metallurgy, to provide accurate grip and seal. Much care goes into the design of both single and double ferrule designs. The gripping action keeps the tubing from slipping under pressure, which could be dangerous. This hardened portion is then able to bite down into the softer metal of the tubing, providing grip.
The back ferrule has a chemically hardened lead edge. The front ferrule is a softer metal and bites down between the tube and the fitting body creating the seal for the double ferrule technology.
The back ferrule, is smaller and engages with the nut. In the double ferrule or twin ferrule design, the front ferrule is the larger piece that sits deepest in the body. If you are working with a double ferrule fitting: This back-end ferrule compression action protects the front of the single ferrule in an attempt to isolate tube vibration from affecting the front end tube bite. Under this force, the angled front-end of the ferrule compresses into the body and grips the stainless steel tube. Initially, the shoulder inside a compression nut engages with the back-end of the ferrule as it is tightened. If you’re working with a single ferrule fitting:
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