Troubleshooting Guide for Ferrule Fittings – PE-LOCK Solutions for Leak-Proof, Vibration-Resistant Performance

Common Problems with Ferrule Fittings

Step-by-Step Troubleshooting Instructions

1. Check Tube Insertion Depth

• Remove fitting and measure ferrule marks
• If tube wasn’t fully inserted, ferrule won’t seat or seal properly
• Always insert tube until it bottoms out on the fitting shoulder

2. Verify Correct Torque or Rotation

• Initial installation requires 1-1/4 turns from finger-tight (double ferrule)
• Reassembly requires only 1/8 to 1/4 turn
• Over-tightening can deform ferrule or fitting body

3. Inspect Ferrules for Damage

• Look for scratches, cracks, or flattening
• Replace damaged ferrules – never reuse after deformation or over-tightening

4. Confirm Component Compatibility

• Avoid mixing brands (e.g., Swagelok® nut with PE-LOCK body)
• Confirm correct material for ferrules, nuts, and tubes
• Ensure tapered threads (NPT/BSPT) are used with thread sealant

5. Use Correct Tube Quality

• Use seamless, round, deburred, and clean tubing
• Avoid tubing that is:
  • Oval
  • Scratched
  • Too soft (e.g., annealed aluminum in high pressure)
  • Contaminated with oil or grease (especially for oxygen)

6. Perform a Leak Test

• Apply soap solution or conduct helium/pressure decay test
• Always test after assembly, before service