TinnerFlow™3rd YearForeman Skills & Jobsite ProductivityCheck first
Vibration plus a sloped steel flange can walk a clamp out of position. Hold the line, add the approved retaining method, or revise the attachment.
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A clamp that moves after startup is not a cosmetic issue. The duct line is telling you the support is not locked against vibration and slope.
Check the clamp type, set screw, flange angle, and equipment vibration. The recovery is usually a rated retainer strap, revised clamp, secondary safety, or a different anchor point approved for that condition.
Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.