TinnerFlow™2nd YearYELLOW · Check FirstSpiral Fittings / Collar Engagement
If the collar engagement is too short to hold, do not trust the joint. Replace the fitting or add an approved coupling/detail with proper overlap.
A spiral joint needs enough overlap to fasten and seal. If the pipe only catches a tiny bite of collar, vibration and pressure can walk it apart.
Check insertion depth, collar condition, pipe cut, and fitting type. Recovery is usually a proper long-collar fitting, approved sleeve/coupling, or replacement fitting before final seal.
Do not use sealant to compensate for almost no mechanical collar engagement.
Short engagement can separate under vibration, leak, and ruin alignment downstream.
Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.