A slight disadvantage is that the joint, once made, cannot be disassembled and reassembled satisfactorily. The ferrules and the swaged portion of the tube must be cut off and new ferrules used to get the same reliability as the original joint. Special non- metallic ferrules and tubing insert are used. Stainless Tubing: Small diameter stainless steel tubing is used to transport process gas or cooling water to and through the vacuum wall. Never use plastic tubing to transport pure gases in vacuum applications or to carry a liquid through a vacuum wall.
The outgassing rates and permeabilities of all plastic tubes are much too high. With a bite type of fitting, all three stress factors can become amplified at the stress riser, where the ferrule bites into the tubing. That can lead to tube fractures. Any extra vibration, pulsation, thermal shock or side load exerted on the fitting, the minimal contact of a bite type fitting offers minimal support behind the bite.
That raises the risk of pull-out or damage to the tube. Any place where the fitting comes into contact with the tubing can become a point of concentrated stress. Swagelok's patented colleting action puts more of the back ferrule in contact with the tubing. The protected stress riser reduces the damaging effect of system vibration. We have three ways for you to learn more about the advantages of Swagelok's patented fitting design. First, we have a video below that goes over the information in this post, but in more detail and with animated illustrations.
For real hands-on instruction about the proper installation of Swagelok tube fittings, sign up for our Swagelok Tube Fitting Safety Seminar. Your fluid systems can't fail—and they can't leak. How to Tighten Npt Fittings. Insert the male thread into the female fitting. Turn the male pipe thread in a clockwise direction. Continue to turn the male pipe fitting in a clockwise direction until you can no longer do so, approximately two to four full revolutions depending on the size and type of fitting.
Olesia Pulgar Explainer. How much is swagelok worth? Yiling Vinarov Explainer. Can you reuse ferrules? Ferrule can never be reused once they have been compressed.
This connector is directly placed over the pipe and the nut is tightened compressing the ferrule between the pipe and the body of the fitting. Also, any flexible fitting or coupling that has blown or pulled off a hose, may never be reused. Pervaiz Barwolff Explainer. How do you use the Swagelok gap inspection gauge? When using the gauge, line it up with the gap between the nut and the body, then gently push it into the gap. If the gap is too small for the gauge to enter, the fitting has been properly tightened.
If the gauge can fit into the gap, more tightening is needed. Braulia Mazo Pundit. How are tubing connectors sealed? The sleeve permanently attaches to the tube either mechanically by flanging or by brazing. As the nut tightens onto the fitting body, it compresses the O-ring between the body and flat face of the tube flange or braze sleeve to form a tight seal.
Xianmei Yarchi Pundit. Is swagelok a compression fitting? Our compression fitting has not one, but two ferrules. The front ferrule creates a seal against the fitting body and on the tubing outside diameter.
As the nut is turned, the back ferrule advances the front ferrule and radially applies and effective tube grip. Our compression fitting ferrule technology enables re-use.
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