What an inspector may reject, and on what authority
Piping Fabrication and Testing Inspection
New-construction quality control on process piping, built on ASME B31.3 Chapters V and VI with ASME Section IX. Not the in-service inspection of plant that is already running, which is where API 570 lives, but the inspector on a fabrication yard or an EPC site deciding whether the weld made this morning may stay in the line. The subject is not welding. It is authority, evidence and the decision to accept or reject: where the right to stop work comes from, what the qualification file actually covers, what the code requires of the work and of the examination of it, and what has to be in the dossier before any of it can be handed over.
Who this path is for
- QC and quality inspectors on EPC projects and in fabrication shops
- Welding inspectors who want the code reasoning behind the acceptance decision
- Engineers and supervisors who have to read an inspection report and act on it
- Anyone who has been asked to sign for work they were not sure they could refuse
Module 1
The Inspector’s Authority and the ITP
Where the right to stop work actually comes from, the four intervention levels and what each obliges, who may interpret and who may only operate, and raising a non-conformance somebody can act on.
Read
- Inspection and test plans — hold, witness, review, and who signsPiping
- Inspector competence and certification — who may interpret, and who only operatesPiping
- Non-conformance and corrective action — the four dispositions, and why NCRs repeatPiping
Then practise
Take an activity you have seen inspected and write the ITP line for it: the activity, the reference document, the acceptance criteria, the intervention level for each party, and the record that closes it. The criterion is the one most often missing.
Module 2
Welding Qualification Under ASME Section IX
The three documents and what each proves, essential against non-essential against supplementary essential variables, the ranges a coupon really qualifies, and the continuity that lapses through disuse rather than on a date.
Read
- Reading a WPS and a PQR — what is on the sheet and what the tests provedPiping
- Section IX essential variables — what invalidates a procedure qualificationPiping
- Welder qualification and continuity — the ranges a ticket covers, and the register nobody updatesPiping
Then practise
Take a WPS and its PQR and check every range on the first against the evidence in the second. The common finding is not a missing qualification but a real one used outside what it established.
Module 3
B31.3 Chapter V, Fabrication and Assembly
Bevels, root gaps and the limits on correcting internal misalignment, tacks as part of the final weld, preheat and post-weld heat treatment by material and thickness, and reading a chart against the cycle that was specified.
Read
- Joint preparation and fit-up — the hold point you only get oncePiping
- Preheat and post-weld heat treatment — hydrogen, hardness, and reading the chartPiping
Then practise
Work out what you would check in the few minutes available at a fit-up hold, in the order that finds problems fastest, and say for each one what becomes impossible once the root is run.
Module 4
B31.3 Chapter VI, Examination and Acceptance
Fluid service as the decision everything hangs off, what five per cent random actually obliges, progressive sampling when a weld is rejected, choosing the method for the defect you fear, and the difference between an indication, a defect and a non-conformance.
Read
- Examination extent and progressive sampling — what five per cent actually obligesPiping
- Non-destructive examination — choosing the method and reading the resultPiping
Then practise
On a package of 400 welds with six welders and two procedures, work out how the 5 per cent is distributed, then work out what one rejection in that sample costs if the two follow-up welds also fail.
Module 5
Pressure Testing, Reinstatement and the Dossier
Stored energy and why water is the default, the boundary and the calibrated gauge, the falling pressure that is temperature rather than a leak, the reinstatement register that keeps a tested system honest, and the chain that has to be followable from a heat number to a line on a drawing.
Read
- Pressure test packs and reinstatement — the gate, and what gets put back afterwardsPiping
- From isometric to installed line — fabrication, erection and testingPiping
Then practise
List everything that would be removed, blinded or disturbed to test a system you know, then say which of those joints will be remade last, fastest, and by whom.
Working through this on your own
Read each module's topics in the order listed, then do the practice before moving on. The practice is the part that matters — reading a topic tells you something, applying it to a document in front of you is what makes it stick.
Every topic ends with ten questions. Treat eight out of ten as the bar for moving to the next module.