Trapeze hanger rods are missing jam nuts
Single nuts can walk under vibration. Use the proper support nut and lock/jam-nut setup at the rod/strut connection per shop standard.
Stop if
- You missed the top jam-nuts on those trapeze rods. Fan vibration will cause those single nuts to slowly back off and sag the duct. Double-nut every connection point to lock those rails solid.
Watch out
- Do not leave a trapeze supported by loose single nuts.
Check
- Check each rod end for support nut and lock nut.
- Verify nuts are tightened against each other.
- Confirm the strut is level after tightening.
- Look for rods that can spin loose by hand.
- Recheck after equipment startup if vibration is present.
Steps
- Check each rod end for support nut and lock nut.
- Verify nuts are tightened against each other.
- Confirm the strut is level after tightening.
- Look for rods that can spin loose by hand.
- Recheck after equipment startup if vibration is present.
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