Apprentice answer

Sprinkler pipe is sitting on my TDC flange

3rd YearPrint Reading, RFIs & Trade CoordinationStop / Verify

Your duct flange is not a pipe hanger. Stop before it gets buried, document the conflict, and coordinate clearance/support instead of letting the pipe load or vibrate against the duct.

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Plain-English answer

A heavy pipe resting on a TDC/Ductmate flange can bow the flange, create leaks, transfer vibration, crush insulation, and make both trades look bad later.

Do not just drop your duct or bend the flange without coordination. Verify the pipe support, your hanger elevations, ceiling/grid space, access, and approved clearances. The recovery may be moving the pipe, dropping/offsetting duct, changing hanger elevations, or escalating the clash.

Field checklist

Take photos showing the pipe resting on or touching the flange.
Check whether the pipe has its own hangers/support independent of your duct.
Check duct hanger rod length/elevation and whether a safe drop/offset is possible.
Check ceiling height, grid, insulation, vibration, and access impacts before moving anything.
Notify your foreman before the conflict gets covered by ceiling or insulation.

Ask Foreman

The sprinkler main is sitting on our TDC flange at [location]. I checked our hanger elevation and their pipe support. Do you want this coordinated with sprinkler, or should we drop/offset our duct per an approved detail?

Verify before acting

Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Sprinkler pipe is sitting on my TDC flange

Plain-English answer

Field checklist

Ask Foreman

Verify before acting

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