By far the most common type of tube fitting for instrument impulse lines is the compression-style
fitting, which uses a compressible ferrule to perform the task of sealing fluid pressure. The essential
components of a compression tube fitting are the body, the ferrule, and the nut. The ferrule and
body parts have matching conical profiles designed to tightly fit together, forming a pressure-tight
metal-to-metal seal. Some compression fitting designs use a two-piece ferrule assembly, such as this
tube fitting shown here (prior to full assembly):
Just prior to assembly, we see how the nut will cover the ferrule components and push them into
the conical entrance of the fitting body:
After properly tightening the nut, the ferrule(s) will compress onto the outside circumference of
the tube, slightly crimping the tube in the process and thereby locking the ferrules in place:
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