62 Gaugeable Tube Fittings and Adapter Fittings Gaugeability
On initial installation, the Swagelok gap inspection gauge assures the installer or inspector that a fitting has been sufficiently tightened.
Position the Swagelok gap inspection gauge next to the gap between the nut and body.
If the gauge will not enter the gap, the fitting is sufficiently tightened.
If the gauge will enter the gap, additional tightening is required.
Always depressurize a system before adjusting the tightness of a tube fitting connection.
Installation Instructions Swagelok tube fittings 1 in./25 mm and smaller can be installed quickly, easily, and reliably with simple hand tools. Over 1 in./25 mm sizes require use of a hydraulic swaging unit to swage the ferrules onto the tubing.
Safety Precautions ■ Do not bleed system by loosening fitting nut or fitting plug.
■ Do not assemble or tighten fittings when system is pressurized.
■ Make sure that the tubing rests firmly on the shoulder of the tube fitting body before tightening the nut.
■ Use the correct Swagelok gap inspection gauge to ensure sufficient pull-up upon initial installation.
■ Always use proper thread sealants on tapered pipe threads.
■ Do not mix materials or fitting components from various manufacturers—tubing, ferrules, nuts, and fitting bodies.
■ Never turn fitting body. Instead, hold fitting body and turn nut.
■ Avoid unnecessary disassembly of unused fittings.
■ Use only long reducers in female Swagelok end connections.
See the instructions starting on the next page for installation of Swagelok tube fittings, O-seal male connectors, caps and plugs, port connectors, tube adapters, positionable elbows and tees, weld fittings, depth marking tool, and preswaging tool.
Tubing Considerations
■ Metal tubing material should be softer than fitting material. For example, stainless steel tubing should not be used with brass fittings.
■ When tubing and fittings are made of the same material, tubing must be fully annealed.
■ Always use an insert with extremely soft or pliable plastic tubing.
■ Extremes of wall thickness should always be checked against the suggested minimum and maximum wall thickness limitations.
■ Surface finish is very important to proper sealing. Tubing with any kind of depression, scratch, raised portion, or other surface defect will be difficult to seal, particularly in gas service.
■ Tubing that is oval and will not easily fit through fitting nuts, ferrules, and bodies should never be forced into the fitting.
See Swagelok Tubing Data, MS-01-107, for more information about tubing selection.
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