Static field route #19072

What do I do when a Vanstone flare tears on round duct?

Spiral, Round & Oval Duct Install🟨 CHECK FIRSTV190 answer-gap expansion

📖 Verified core answer

A torn Vanstone flare is a mechanical sealing failure, not just a mastic problem. Trim/replace/re-flange the damaged end per the approved method.

Open in Field Rescue Open category

Field verification checklist

Inspect the full circumference of the flare for splits, folds, thin spots, or out-of-round shape.
Check whether enough straight duct length remains to trim and re-flange.
Verify ring/gasket fit and whether the joint is high-pressure or special system.
Check if the damage came from tool setup, cold metal, bad support, or wrong material.
Ask before shortening a section that affects layout length.

Ask foreman

The Vanstone flare on this round section is torn at [location]. I checked ring fit and remaining length. Do you want me to trim/re-flange it, replace the section, or send it back to the shop?

Text to foreman

Route options

AMake the field correction only if it is within your assignment and the approved method.

BHold and document the condition if the fix affects airflow, access, life safety, pressure class, rated assemblies, equipment, or another trade.

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

Do not do this

Do not smear sealant over a torn Vanstone edge and install it under pressure as if the flare is sound.

Why this matters

A bad flare can leak, fail pressure testing, and keep companion rings from clamping evenly.

Verification basis

Approved drawings/specs, project coordination drawings, manufacturer instructions/submittals, shop standards, foreman/detailer direction, employer policy, and AHJ/code requirements.