TinnerFlow™1st YearYELLOW · Check FirstShort Sleeve Overlap
A tiny overlap can pop loose under vibration or air pulse. Recut/replace the pipe so it seats deep enough in the collar before fastening and sealing.
You are cut-fitting a round branch line pipe to slide into a start collar. You trim the pipe short, leaving only a frac{1}{4}\text{-inch} metal overlap inside the sleeve collar before zip-screwing the joint. On testing, the vibration pops the pipe loose.
A tiny overlap can pop loose under vibration or air pulse. Recut/replace the pipe so it seats deep enough in the collar before fastening and sealing. 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 screw a joint together when it barely catches the collar lip.
Mechanical overlap is what keeps the joint together before sealant does anything.
Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.