Turnover packages rarely fail because someone did bad work. They fail on five specific inconsistencies, all of which are cheap to fix on the day and expensive to fix at handover. In rough order of how often they show up:
1. The weld that exists in steel and not on paper
The isometric shows 47 welds. The log has 46 rows. Somewhere out there is a joint that was welded, probably examined, and never recorded — and finding it means walking the line with a print.
Catch it: reconcile the count on the log against the count on each isometric weekly. It takes minutes and it is the single highest-yield check on this list.
2. Continuity that lapsed mid-job
A welder is qualified on the day they start. Their continuity lapses in week four. They keep welding, because nobody is tracking dates against a roster, and every weld after that date is unqualified.
This is the most expensive item here, because the fix is not paperwork. It is cutting out and replacing welds, after the system is tested and painted.
Catch it: check continuity against the welder roster monthly, and again before anyone returns to the job after time off.
3. A calibration that expired before it was used
The gauge on the pressure test had a certificate. It expired eleven days before the test. The test is unverifiable and has to be repeated — on an insulated, painted, energised system.
The same applies to any instrument used to accept work: DFT gauges, torque wrenches, holiday detectors.
Catch it: keep the calibration expiry dates somewhere visible, and check them the morning of the test rather than the week of handover.
4. The NCR nobody closed
An NCR raised in week two, dispositioned verbally, worked off in the field, and never written up. It sits open in the log. One open nonconformance holds the entire package regardless of how complete everything else is.
It is almost always the earliest one — late NCRs are fresh in everyone's memory, and the week-two one is not.
Catch it: review the open NCR list at every progress meeting. Reading the list aloud is enough; the point is that somebody has to say "still open" in front of other people.
5. An as-built that contradicts the weld log
A joint gets relocated in the field. It is redlined on the drawing, correctly. The weld log still shows the original location. Both documents are honest and they disagree, which from the outside is indistinguishable from a records failure.
Catch it: whoever redlines the drawing updates the log in the same sitting. Not later that day — the same sitting.
Every item on this list is a comparison between two documents. None of them are visible inside any single record, which is exactly why they survive until the client goes looking.
The pattern
None of these are quality problems. The welds are sound, the material is right, the tests passed. They are consistency problems, and consistency degrades with time and staff turnover — which is why a package assembled at the end of a job is always worse than the same package maintained during it.
The contractors who never have this conversation are not the ones who are more careful at handover. They are the ones who reconcile weekly, so there is nothing to discover at the end.