Static field route #19346

What do I do when teardrop hangers are dimpling spiral pipe?

Hanger Systems, Rods, Straps, Trapeze & Anchors⚠️ CHECK BEFORE YOU FIXField answer expansion

📖 Verified core answer

Teardrop loops may not control large round duct under dynamic load. Upgrade to an approved rigid saddle, split ring, or trapeze cradle.

Open in Field Rescue Open category

Field verification checklist

Look for strap dimples, sidewall buckles, or rub marks.
Check whether the run moves on startup.
Identify fan/damper pressure changes nearby.
Use approved rigid support/cradle where needed.
Repair or replace dented pipe if the airflow path is affected.

Ask foreman

The spiral pipe at [location] is dimpling inside the teardrop loops when the fan runs. I checked the support contact points. Do you want rigid saddles or trapeze cradles installed?

Text to foreman

Route options

ACorrect it only if the fix is within your assignment and approved method.

BHold and document if it affects pressure class, listed assembly, material spec, support load path, fire barrier, equipment, TAB, or another trade.

CBring the foreman/detailer the location, what you checked, and what decision you need before sealing, testing, cover, or startup.

Do not do this

Do not let a loose loop hanger become a cutting/crushing band on round duct.

Why this matters

Dimpling can damage the barrel, create leaks, cause noise, and move the run out of alignment.

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, pressure/material schedule, and AHJ/code requirements.

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