Ultrasonic Testing (UT) Requirements Under Pemex proveedores / NRF
Sensitivity setting is the auditable step: the reference block used must itself be in calibration and traceable, and its identity recorded on the report. Pemex proveedores / NRF, enforced by Petróleos Mexicanos (Pemex); technical standards issued by the Comité de Normalización de.: This is where Pemex diverges sharply from baseline Mexican practice, and it is the argument that sells.
An auditor examining UT asks for instrument, probes, cables, couplant, and the calibration and reference blocks used to set sensitivity. Pemex publishes more than most national oil companies. The padrón de proveedores y contratistas is a public registry described on pemex.com, and the Normas de Referencia (NRF) and the newer PEMEX-EST technical standards are published as downloadable PDFs on the same site, issued by the Comité de Normalización de Petróleos Mexicanos y Organismos Subsidiarios and applied as mandatory in Pemex acquisitions and service contracting. Registration information is transferred to SISCeP, Pemex's electronic contracting platform, and suppliers are told the registration is theirs to keep current — updated at least once a year. What Pemex does not publish is the internal evaluation scoring, weighting or any pre-approved vendor list for inspection services.
Source: Pemex's public supplier pages on pemex.com — Relación con proveedores, Registro de proveedores, Requisitos for national suppliers, Proceso de registro, and the Padrón de proveedores y contratistas transparency page — together with Pemex's 'Guía rápida para el registro y evaluación de proveedores y contratistas', for the registration steps, required corporate and tax documents, the annual update duty and the transfer of registration data to SISCeP. Normas de Referencia and PEMEX-EST standards are published at public pemex.com URLs under procura/procedimientos-de-contratacion — examples confirmed to exist there include NRF-193-PEMEX-2014, NRF-065-PEMEX-2014, NRF-010-PEMEX-2014, PEMEX-EST-IC-274-2018 and PEMEX-EST-TD-142-2017 — and are issued by the Comité de Normalización de Petróleos Mexicanos y Organismos Subsidiarios. Important limitation, stated plainly: the pemex.com host refused connections from this environment on 21 August 2026, so the NDT personnel requirements attributed here to Pemex NRFs were read from secondary summaries of NRF-193-PEMEX-2014 rather than from the primary PDF. For that reason no NRF clause numbers are quoted anywhere in this entry, and the specific NRF or PEMEX-EST cited in a given tender should be downloaded and read before relying on the detail. Verified 21 August 2026.
| Item | What applies | Why it matters |
|---|---|---|
| Regime | Pemex supplier and contractor registration and the Normas de Referencia / Estándares Técnicos technical requirements | Enforced by Petróleos Mexicanos (Pemex); technical standards issued by the Comité de Normalización de Petróleos Mexicanos y Organismos Subsidiarios |
| Method | Ultrasonic Testing (UT) | Needs its own procedure and its own qualified personnel |
| Procedure approval | Per the certification scheme and the client specification | The signature an auditor traces |
| Other methods in scope | PAUT, RT, MT, PT, VT, ET | Each needs separate qualification |
| Renewal | Pemex states that keeping the registration information current is the supplier's responsibility and that it should be updated at least once a year. Pemex does not publish a single uniform validity period for supplier registration across all categories, so no interval should be quoted to a client without checking the current registration rules on pemex.com. On the technical side the operative mechanism is revision control rather than renewal: NRFs are revised and reissued by the Comité de Normalización, with newer editions cancelling and replacing earlier ones, and PEMEX-EST standards have been issued alongside them since 2017-2018 — so the edition cited in the tender governs. Personnel certificates renew on their own scheme's cycle; ISO 9712-based certification is typically five years. | Applies to the personnel certification behind this method |
Does Pemex proveedores / NRF require a separate procedure for UT?
Yes. Every method in scope needs its own written procedure, approved by someone qualified in that method, describing technique, equipment, calibration, scanning or coverage, acceptance criteria and reporting. A single combined "NDT procedure" covering several methods is a finding under every regime that names procedures individually.
Who can approve a UT procedure under Pemex proveedores / NRF?
Approval follows the certification scheme and the governing specification rather than the employer alone. The person approving must hold the scheme's qualification for UT at the appropriate level.
What UT records does a Pemex proveedores / NRF audit sample?
The approved procedure, the technician's UT certification on the date of work, and the equipment evidence — instrument, probes, cables, couplant, and the calibration and reference blocks used to set sensitivity. The auditor works backwards from a finished job, so every item has to reconcile with the report and its stated acceptance criteria.
What is the most common UT finding at audit?
An in-calibration instrument used with an unidentified or out-of-calibration reference block. It is a records failure rather than a technique failure — the examination was performed correctly and the evidence supporting it cannot be produced, which under Pemex proveedores / NRF is recorded the same way as not having done the work.
Can a technician certified elsewhere perform UT under Pemex proveedores / NRF?
Where the scheme's certification travels with the individual, yes — that is the point of central certification. Verify the certificate covers UT at the level required and is current, since scope and expiry are what get checked.
What equipment evidence does UT need under Pemex proveedores / NRF?
Calibration status traceable to the day of use, covering the instrument and its accessories — probes, cables, blocks and reference standards for ultrasonics; sources and densitometers for radiography. An in-calibration instrument with an out-of-calibration reference block fails the same way as an uncalibrated one.
How do UT requirements differ from the other methods in Pemex proveedores / NRF?
Scope, qualification and evidence are method-specific, so the differences are real rather than administrative. Pemex proveedores / NRF also covers PAUT, RT, MT, PT, VT, and each carries its own procedure, its own personnel qualification and its own equipment evidence.
Personnel certification for UT
This is where Pemex diverges sharply from baseline Mexican practice, and it is the argument that sells. NOM-020 accepts 'personal certificado' under NMX-B-482 or an equivalent, which leaves room for an employer written practice; published Pemex reference standards are stricter, requiring NDT personnel to be qualified and certified to ISO 9712 or to NMX-B-482-CANACERO-2016, with ISO 11484 cited as the applicable route for certain steel-product scopes, which follows a different qualification model. Level rules apply: Level 1 works only under direct Level 2 supervision, and interpretation of results is issued by Level 3, or by Level 2 with Level 3 approval. An outsourced Level III must personally hold certification under the scheme the contract cites.
Related: the Pemex proveedores / NRF overview, outsourced ASNT Level III cover, written practice development, NDT procedure development, a programme gap assessment, interim Level III cover.