TinnerFlow™1st YearYELLOW · Check FirstScrews Into Spiral Lockseam
The spiral lockseam is the pipe’s structural seam. Fasten through smooth barrel metal at the overlap, not through the multi-layer lockseam.
The journeyman asks you to prep four lengths of 14-inch round spiral pipe by sliding them onto connecting couplings. You slip them on, but drive your zip screws into the interlocking factory spiral seam lock instead of the smooth metal barrel, splitting the seam.
The spiral lockseam is the pipe’s structural seam. Fasten through smooth barrel metal at the overlap, not through the multi-layer lockseam. The likely recovery is to check the condition, correct prep/setup if it is within your assignment, and bring the foreman clean information before the work creates rework overhead.
Do not drill directly through the four-ply spiral lockseam track.
Damaging the lockseam can ruin the pipe and create a leak path.
Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.