Static field route #19351

What do I do when standard spiral lockseam pipe is used on grease exhaust?

Grease Duct, Kitchen Exhaust & Industrial Exhaust⛔ STOP / GET DIRECTIONField answer expansion

📖 Verified core answer

No. Treat grease/liquid exhaust construction as a stop item. Standard spiral lockseam is not a field patch for grease service.

Open in Field Rescue Open category

Field verification checklist

Confirm whether the line is true grease/kitchen exhaust or another exhaust type.
Look for leakage at lockseam, joints, and fittings.
Check drawings/spec/material schedule.
Document any contaminated dripping or food-area exposure.
Hold for foreman/detailer/AHJ direction before operating or covering.

Ask foreman

This kitchen/dishwasher exhaust at [location] appears to be standard spiral lockseam and is leaking liquid/grease. I stopped work. Do you want this held for the approved grease-exhaust material/detail?

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 use mastic to make standard spiral pipe into grease duct.

Why this matters

Wrong grease exhaust construction can create fire risk, health issues, failed inspection, and major rework.

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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