Swagelok MS-12-01 Tube Fitting Instructions
- June 5, 2024
- Swagelok
Table of Contents
Swagelok Tube Fitting Instructions for 1 in. (25 mm) and smaller fittings
Instructions
Installation
These instructions apply to both traditional fittings and to fittings with the advanced back-ferrule geometry. Safe practices and proper installation are imperative to the performance of the Swagelok tube fitting, especially in critical applications. For 5/8, 3/4, 7/8, and 1 in (16, 18, 20, 22, and 25mm) tube fittings in all materials except for aluminum and brass, it is a best practice to presage the ferrules onto the tube using a Swagelok multi-head hydraulic swaging unit (MHSU) to lower installation time and increase ease of installation. Refer to Multihead Swagelok Unit (MHSU), Setup and Operating Instructions, MS-12-37, for additional information.
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Fully insert the tube into the fitting and against the shoulder; rotate the nut finger-tight. Fig. 1.
High-Pressure Applications and High Safety-Factor Systems: Further tighten the nut until the tube will not turn by hand or move axially in the fitting. -
Mark the nut at the 6 o’clock position. Fig. 2.
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While holding the fitting body steady, tighten the nut one and one-quarter turns to the 9 o’clock position. Fig. 3.
Note: For 1/16, 1/8, and 3/16 in.; 2, 3, and 4 mm tube fittings, tighten the nut three-quarters turn to the 3 o’clock position.
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. Fig. 4.
- If the gauge will not enter the gap, the fitting is sufficiently tightened.
- If the gauge will enter the gap, additional tightening is required.
Reassembly Instructions — You may disassemble and reassemble Swagelok tube fittings many times.
Warning
Always depressurize the system before disassembling a Swagelok tube
fitting.
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]Prior to disassembly, mark the tube at the back of the nut; mark a line along with the nut and fitting body flats. Fig. 5.
Use these marks to ensure you return the nut to the previously pulled-up position. -
Insert the tube with pre swaged ferrules into the fitting body until the front ferrule seats against the fitting body. Fig. 6.
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While holding the fitting body steady, rotate the nut with a wrench to the previously pulled-up position as indicated by the marks on the tube and the flats; at this point, you will feel a significant increase in resistance. Fig. 7.
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Tighten the nut slightly.
Caution
Do not use the gap inspection gauge with reassembled fittings.
Caution
Do not mix or interchange parts with those of other manufacturers.
For additional information, see the Gaugeable Tube Fittings and Adapter Fittings catalog, MS-01-140.
March 2021, RevF
MS-12-01
Swagelok—TM Swagelok Company
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