How to Vet an NDT Contractor in the US — What Actually Predicts Quality

Start with the records, not the capability statement

Every contractor's brochure lists the same methods. What differs — and what predicts whether findings will survive scrutiny — is the state of their records. Ask for four things before the technical conversation:

The Written Practice. Their actual document, not a reference to SNT-TC-1A. Read whether the hour and examination requirements have been engaged with or left at the published defaults, and check the named Level III is someone who can describe the programme.

Personnel files for the crew they would assign. Not a summary — certifications with levels and expiry dates, vision records with dates, and documented experience hours. Ask specifically for the people who would work your site, because the crew that shows up is often not the crew in the proposal.

Calibration evidence. Instrument certificates in date, and the daily verification checks their procedures require. Annual certificates alone tell you nothing about the day your job runs.

A redacted sample report from work like yours. Look for whether findings are traceable to locations, technicians and instruments, and whether the evaluation cites the acceptance criteria it applied.

Four questions that separate capability from marketing

"Who is your Level III and what did they approve most recently?" Hesitation here is the single most informative moment in the meeting.

"How do you deliver data — PDF, or structured records our system can consume?" The answer predicts whether you can ever build a trend across campaigns, or whether each inspection is an isolated document.

"What happens when your technician finds something outside the scope we contracted?" You want a contractor whose answer involves telling you immediately, not one whose answer involves a change order.

"Show me a job where the finding was disputed." Every experienced contractor has one. How they describe it — records produced, technique defended, or blame relocated — tells you what happens when it is your asset.

Warning signs that appear early

A proposal that names no personnel. Equipment lists without probe and wedge detail for your geometry. Willingness to commit to a schedule before seeing the scope. Reports quoted in days when the crew size implies otherwise. And the quiet one: a contractor who never says no to a scope. Specialist work that a firm cannot actually staff gets subcontracted to someone you did not vet, under your contract, with your name on the finding.

What to write into the contract

Personnel qualification evidence on request throughout the contract, not just at award. Notification when assigned personnel change. Structured data delivery alongside the report. And the right to audit their records — rarely exercised, but its presence changes how records are kept.

Related: what auditors check on a contractor · the evidence-pack checklist · how the US contractor market splits · independent review of a contractor's programme.