Validating Time of Flight Diffraction Reports Under ABSA / AB-515
Any person or organization providing in-service pressure equipment integrity assessment services in Alberta and certifying the results, plus firms constructing, repairing or altering boilers, pressure vessels, pressure piping and fittings, or servicing pressure relief valves. Owner-users may be directed in writing to hold their own permit.
Under ABSA / AB-515 the recurring finding is: Work performed outside the scope listed on form AB-515(a). On a Time of Flight Diffraction report specifically, a near-surface dead zone left uncovered by any complementary technique, so the most likely flaw location was never examined Both are what an independent review of a TOFD report opens first.
A near-surface dead zone left uncovered by any complementary technique, so the most likely flaw location was never examined. ABSA requires an inspection firm performing in-service integrity assessments to hold a Quality Management System Certificate of Authorization Permit and to document its system against AB-515. The written description must address scope, organization, impartiality, confidentiality, competence, measuring and test equipment, integrity assessment procedures, plans and work plans, reporting, repairs and alterations, internal audits, and control of NDE. Authorized scope is fixed on form AB-515(a), and work outside it is prohibited until a revised AB-515(a) is accepted. A validation that finds the report sound is as useful as one that does not: the point is a defensible answer, not a defect.
Source: ABSA AB-515 Quality Management System Requirements for Integrity Assessment Organizations, Edition 3 Revision 0, issued 2022-09-19 (next scheduled revision 2027); ABSA AB-526 In-Service Pressure Equipment Inspector Certification Requirements, Edition 3 Revision 3, issued 2025-01-17; ABSA AB-512 Owner-User Pressure Equipment Integrity.
| Factor | What applies | Why it matters |
|---|---|---|
| Method under review | Time of Flight Diffraction (TOFD) | Each method leaves a different evidence trail |
| What the reviewer opens | probe separation against the depth of field claimed, the lateral wave and backwall timing, and how the near-surface dead zone was covered | The items a dispute turns on |
| Most common way it fails | a near-surface dead zone left uncovered by any complementary technique, so the most likely flaw location was never examined | Usually a records failure, not a technique failure |
| Governing regime | ABSA, the pressure equipment safety authority — Quality Management System Certificate of Authorization Permit for Integrity Assessment Organizations (AB-515) | Enforced by ABSA |
| Personnel basis | Employer-based certification — the written practice is part of the evidence | Whether the certification itself can be verified independently |
| Records regime | The normal term of a Certificate of Authorization Permit is three years. | How far back the trail has to reach |
What does a TOFD report have to show under ABSA / AB-515?
Probe separation against the depth of field claimed, the lateral wave and backwall timing, and how the near-surface dead zone was covered — plus the procedure number and revision, the technician's TOFD certification current on the date of work, and the acceptance criteria with the code edition they came from. Missing any one of those makes the examination unprovable rather than merely undocumented.
What most often makes a TOFD report indefensible?
A near-surface dead zone left uncovered by any complementary technique, so the most likely flaw location was never examined. It is a records failure rather than a technique failure — the examination was very likely performed correctly, and the evidence supporting it cannot be produced, which under ABSA / AB-515 is treated the same way as not having done the work.
Can a TOFD report be validated without re-inspecting?
Substantially, yes — this method leaves recorded data or images a reviewer can reopen and interpret independently, rather than a summary of what someone saw. That is the strongest position a validation can be in: the original evidence is still there to be re-read.
Who is qualified to validate a TOFD report under ABSA / AB-515?
A Level III qualified in TOFD specifically. Method scope is the constraint people miss: a Level III qualified in another method cannot approve or credibly challenge a TOFD interpretation, and an opposing reviewer will test that first because it is documentary and binary.
How far back do ABSA / AB-515 records have to reach?
The normal term of a Certificate of Authorization Permit is three years. ABSA conducts surveillance audit(s) within the term and continued validity depends on an acceptable audit. Renewal requires review and updating of the manual and submission of a new application for re-certification, approximately six months before expiry. In-Service Inspector Certificates of Competency run on a separate five-year cycle: form AB-98 plus the renewal fee of $188.90 must be submitted at least 21 days before expiry, with at least 15 weeks of in-service inspection experience in the last five years, a minimum of 80 hours of technical training (of which up to 12 hours may be in-house) and a re-certification examination. Where a validation is being done for a dispute or a purchase, the retention period is what decides whether the question can be answered at all — records that were never kept cannot be reconstructed afterwards, and a reconstruction is worth markedly less than a contemporaneous record.
What happens if the validation finds the report was correct?
That is a normal and useful outcome. The buyer gets a defensible position to accept the work, pay the invoice, close the claim or proceed with the purchase — supported by an independent review rather than by assertion. A validation is commissioned to settle the question, not to find a defect.
What the reviewer traces
Probe separation against the depth of field claimed, the lateral wave and backwall timing, and how the near-surface dead zone was covered.
Personnel and records under ABSA / AB-515
Two separate credentials apply, and only one can be outsourced. NDT technicians work under employer-based certification: AB-515 §4.14 states an NDE organization conforming to ISO 9712, SNT-TC-1A or CP-189 (ACCP/ASNT) is desired, requires NDE procedures approved and signed by a Level III, and explicitly accepts a Level III who is 'contract or employee'. An outsourced Level III can therefore own the written practice and sign procedures.
Related: the report validation service, what makes a report defensible, ABSA / AB-515 requirements, TOFD under ABSA / AB-515 and outsourced ASNT Level III cover.
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