Download test reports on Swagelok tube fittings' tube grip, gas seal, and vibration resistance
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To access a collection of 34 product test reports (PTRs), fill the form on this page then check your email. The collection includes:
- Eight tube grip PTRs, including the Hydrostatic Pressure Tests and the Fire (Burn) Test
- Eight gas seal PTRs, including the Nitrogen Gas Pressure Tests, Steam Cycle/Thermal Shock Test, and Cryogenic Temperature Leak Tests
- Three vibration-resistance PTRs, including the Rotary Flex Test, Shaker Table Vibration Test, and Seismic Intensity Analysis
- Third party product approvals and registrations
About Swagelok tube fittings' tube grip
The main function of a tube fitting is to grip the tubing sufficiently to contain system fluid. The tubing and fitting must remain connected without leakage at maximum working pressure. When overpressure occurs, such as in proof testing or when pressure spikes occur outside normal operating conditions, the fitting must also maintain both grip and seal on the tubing. Harder, heavier-walled tubing presents greater challenges for ferrule gripping action because it can be taken to higher pressure and is more resistant to the ferrule swaging or indentation. This gripping challenge on heavier-walled tubing may be severely compromised when fittings are under-tightened and/or not properly bottomed in the fitting body prior to installation. A high-quality tube fitting is designed to be more tolerant of these conditions.
About Swagelok tube fittings' gas seal
Evaluating small molecule gas applications is important when determining if a tube fitting is reliable. Performance of a fitting in high-pressure gas applications must be evaluated under the conditions of initial assembly and repeated reassembly of the components. Repeatable seal integrity in high-pressure gas testing after reassembly is the true test of a fitting design. Another challenge in gas seal applications pertains to thin-wall tubing, since it offers the least swaging resistance to provide for the coining action of the ferrules. In most applications, heavier-wall tubing provides a more reliable gas seal because it allows for ferrules to coin or reduce small defects on the tubing surface that could contribute to gas leakage.
About Swagelok tube fittings' vibration resistance
Any system may experience vibration during operation. Rotary equipment, such as pumps or compressors, can impart alternating stress vibration on the tubing runs.Because tube fittings grip the surface of the tubing, creating potential stress risers on the tube surface, the tubing can be exposed to amplified alternating stress and fatigue fracture. A good tube fitting, with hinging-colleting ferrule design, reliably collets or isolates the tubing outboard of the potential stress riser. This colleting action will minimize the effects of vibration stress at the ferrule grip location.
To download the collection of 34 product test reports, fill the form on this page.
