Weld Pin Spacing for Liner

Weld pin spacing and length for this liner thickness? Washers on every pin?

I'm checking weld pin spacing for liner at [location]. I found small metal pins with washers welded to duct interior, holding liner. Weld pin spacing and length for this liner thickness? Washers on every pin?

Insulation, Liner & Vapor Barrier 1st Year YELLOW

Stop if

Hold point on weld pin spacing for liner: I have the location, photo, drawing/detail, and what was checked. Who should verify before this gets cut, covered, lifted, sealed, energized, or signed off?

Watch out

Don't guess pin spacing. Don't skip pins at edges and corners. Don't use pins too short for liner thickness.

Check

room/grid/area
photo of condition
drawing/detail
manufacturer/model if visible
what I already checked

Say this to your foreman

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