Periodic requalification of pressure equipment: what the rules require

On most sites, two terms get used for one another: periodic inspection and periodic requalification. They are in fact two different operations, each with its own actors, its own due dates and its own stakes. Confusing them means scheduling the wrong intervention on the wrong date, and finding that out in front of the inspection body.

This article sets out the framework for the in-service follow-up of pressure equipment, separates the two notions, and details the one document that decides everything on the day of a control: the operating and monitoring file.

Two operations not to be confused

The periodic inspection is the more frequent check. Its aim is to confirm the equipment is still fit to operate safely: external and internal examination, a check of the safety accessories and, depending on the case, complementary testing. It is conducted under the operator's responsibility, by a competent person or a recognised inspection service.

The periodic requalification is the heavier operation. It falls due on a longer cycle and combines the inspection of the equipment, the hydraulic pressure test or strength examination when one is required, the check of the safety accessories and the review of the file. It is carried out under the control of an authorised in-service inspection body, which stamps the equipment and issues the report.

The practical distinction fits in one sentence: periodic inspection watches, requalification re-attests the equipment's fitness to stay in service. How the cycles are built is covered in equipment inspection intervals.

Which framework, and which equipment

Two regulatory worlds get mixed up and need separating. Design and placing on the market fall under the European Pressure Equipment Directive, PED 2014/68/EU, which applies across the EU and the EEA. It is the directive that sorts equipment into risk categories according to pressure, volume or diameter, and the nature of the fluid, and that conditions CE marking. It governs new equipment, before it enters service.

In-service follow-up is a separate matter, and it is not harmonised at European level: each country sets its own regime for periodic inspection, requalification, interventions and declarations, and designates the bodies competent to carry them out. France's order of 20 November 2017 is one such national text; other member states run their own equivalents. What these regimes share is the scope: vessels, piping, steam generators and simple pressure vessels, above thresholds that depend on the category of the equipment. Below those thresholds, an item may fall outside the formal obligations without falling outside the operator's duty of care.

The first reflex, then, is to know equipment by equipment whether it falls within the in-service regime that applies to your site, and on what basis. A vague inventory is the single most common source of missed due dates.

Who does what: operator and inspection body

• The operator is responsible for keeping the equipment compliant and the file up to date. They arrange the inspections, trigger requalifications at the planned due dates, oversee interventions and preserve their traceability.
• The competent person or recognised inspection service conducts the periodic inspections under the operator's responsibility.
• The authorised in-service inspection body acts for the requalification and for certain control operations. It is the body that validates, stamps and issues the report.

The inspection body never stands in for the operator: it checks, it does not run the fleet on your behalf. The quality of the file put in front of it shapes how the requalification unfolds, in the same spirit as the preparation described in preparing a technical and regulatory audit.

Intervals in principle

National in-service regimes set maximum periodicities, not recommendations. The operator can, and sometimes must, tighten these intervals where the condition of the equipment warrants it.

As a matter of principle, periodic inspection follows the shorter cycle, tighter still for certain equipment such as steam generators or quick-actuating closures. Periodic requalification falls on a longer cycle for common equipment. That ceiling is cut where the fluid is toxic or corrosive, and a named list of aggressive fluids calls for a shorter cycle again.

The exact figures, their precise scope and their exceptions live in the applicable national text, not in an inherited works memo: the official text is what counts, not the workshop's memory. Where you operate in France, for instance, these values sit in the articles of the 2017 order.

What triggers a requalification

A requalification is not always calendar-driven. Several events bring it forward, outside the periodic due date:

• a notable intervention: a repair or modification affecting the pressure-retaining parts;
• a return to service after a long shutdown, a change of location or a change in operating conditions, in the cases the applicable text provides for;
• a doubt over integrity revealed by an inspection or an incident.

Anything that changes the equipment, or unsettles what was known about it, can bring the due date back to today. This is why the traceability of interventions counts as much as that of the inspections.

The operating and monitoring file: the master document

This is the heart of the arrangement, and the point where most sites lose time and credibility.

The in-service regimes require an operator to build and keep up to date, for each item of equipment, a file that brings together the original technical documentation and the whole record of in-service follow-up. It gathers:

• the equipment documentation: manual, certificate or declaration of conformity, design elements;
• the periodic inspection reports;
• the periodic requalification reports and the associated certificates;
• the repair and modification reports;
• the complete history of the equipment, incidents and interventions included.

On the day of the requalification, the inspection body reviews this file. A file with gaps cannot be salvaged within the hour: a missing document becomes a nonconformity, and a history reconstructed from memory is worth less than a record taken on the spot. The difficulty is almost never the real condition of the equipment, but the ability to prove it.

Building this file from the reports

The file only exists if it is fed as you go. Filing it once a year is not enough: each report has to be attached to the right equipment, placed in its history and findable on demand. The subject is developed in centralising inspection reports.

This is where a documentary intelligence tool earns its place. A platform such as Integrity Loop reads inspection reports, extracts findings, measurements and due dates, attaches them to the equipment and files them in order, so the file stays structured, dated and searchable. It does not judge compliance and does not stand in for the inspector or the inspection body: it keeps the file those parties require, and makes sure no displayed value is orphaned from its source report. The quality of the data depends first on its source, a point non-destructive testing methods returns to.

Adjusting the intervals: the recognised inspection plan

The maximum intervals are not set in stone. National regimes generally allow inspection and requalification periods to be adjusted where the operator establishes an inspection plan built on an approved industry guide and validated by an inspection body.

This adjustment is not a free relaxation. It assumes a reasoned understanding of the degradation mechanisms, representative measurement points and a solid history. This is the logic of risk-based inspection: you match the effort to what you know about the equipment, provided you can demonstrate it. An inspection plan with no usable data is not a plan, it is an intention.

• Confusing periodic inspection with periodic requalification.They are two distinct operations, with different actors and different due dates. Scheduling one while believing you have satisfied the other is a nonconformity.
• Treating the maximum interval as a target.The regime sets ceilings. The operator shortens where the condition warrants it; the maximum is a limit, not a recommendation.
• Neglecting the non-calendar triggers.A notable repair or a return to service can call for a requalification before the due date. Ignoring these cases means operating equipment out of frame without knowing it.
• Discovering an incomplete file on the day of the requalification.A missing document becomes a nonconformity. The file is kept all year, not the night before.
• Adjusting an interval without data.A recognised inspection plan assumes a solid history and identified mechanisms, not a relaxation request based on habit.