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The Fluid Systems Engineering and Management Blog

by Swagelok Northern California

The Big Three: What Makes a Swagelok® Tube Fitting Superior

by Jeff Hopkins, on 3/16/16 8:00 AM

Learn how our patented back ferrule geometry and patented SAT 12 case hardening process provides an advantage in several different industries at http://northerncal.swagelok.com/swagelok-tube-fitting-advantage

Tube grip, gas seal, and vibration protection

 

Swagelok Tube  Fitting Advantage

When evaluating tube-fitting performance, look for these Big Three factors: tube grip, gas seal, and vibration protection. You should expect a tube fitting to deliver outstanding performance in all three areas, and Swagelok patented two-ferrule fitting design gives you what you are looking for.

Tube grip

Swagelok's hinging collecting action puts more of the back ferrule's surface in contact with the tubing. This provides more material for direct axial support and colleting squeeze. You won't get that with a bowing ferrule or from the bite type. With Swagelok, you get a stronger seal under maximum working pressure.

Gas seal

A Swagelok tube fitting forms a gas seal by means of the burnishing that occurs in two places: between the front ferrule and the tube fitting body, and between the front ferrule and the tubing.

Vibration protection

Bending, deflection and vibration puts stress on tubing. 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.


When evaluating tube-fitting performance, look for these Big Three factors: tube grip, gas seal, and vibration protection. You should expect a tube fitting to deliver outstanding performance in all three areas, and Swagelok patented two-ferrule fitting design gives you what you are looking for.

Learn more

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 an even deeper look, we have PDFs that illustrate the Swagelok Tube Fitting Advantage in specific industries plus Product Test Reports that show these advantages in action.

For real hands-on instruction about the proper installation of Swagelok tube fittings, sign up for our Swagelok Tube Fitting Safety Seminar.

 

Video: The Swagelok Tube Fitting Advantage: The Big Three

 

 

Additional Resources

 

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Topics:Fittings

We perform under pressure

Your fluid systems can't fail—and they can't leak. That's why Swagelok Northern California offers mission critical solutions for the petrochem, semi, power, and oil and gas industries around the Bay Area and into NW Nevada. We manufacture and assemble reliable, customizable components that get the job done. Contact our team today to learn about custom solutions for your plant or refinery.

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