Everything you need to know about the inspection of pressure vessels
Pressure vessels are widely used in industrial and technical installations for the storage and transport of gases and liquids under pressure. To ensure safety and compliance with legislation and regulations, the inspection of pressure vessels is a legal requirement under VLAREM II, Chapter 5.16.
What is a pressure vessel inspection and why is it mandatory?
A pressure vessel inspection is a mandatory check that verifies the integrity, safety and compliance with legal requirements. Pressure vessels can be dangerous if not properly maintained, as a defect can lead to leaks or explosions.
Why are pressure vessel inspections mandatory?
To prevent defective pressure vessels from causing dangerous situations. Technical compliance stems from the Pressure Equipment Directive (PED 2014/68/EU). Regular inspections help to detect and rectify defects at an early stage.
For which pressure vessels is an inspection mandatory?
- Pressure vessels where the volume (litres) multiplied by the pressure (bar) exceeds 3000 litres x bar.
- Both stationary and mobile pressure vessels.
- Pressure vessels in industrial, technical and medical applications.
How is a pressure vessel inspection carried out?
An inspection is carried out by a certified environmental expert and includes:
Preparation for the inspection
Inspection of technical documents, such as the manufacturing file and previous inspection reports. Submission of a CE certificate for the safety valve is mandatory.
Ensuring access to the pressure vessel and safe working conditions.
Visual inspection
Checking the exterior and interior of the pressure vessel for signs of wear, corrosion and other defects.
Non-destructive testing (NDT)
Testing using methods such as ultrasonic testing, X-rays or magnetic testing to assess structural integrity.
Pressure test
Testing the pressure vessel under increased pressure to check its strength and leak-tightness.
Reporting and certification
Preparation of a report detailing the findings.
Issuing of an inspection certificate if the pressure vessel meets the requirements.
Recommendations for repair or maintenance if defects are found.
How often must pressure vessels be inspected?
The inspection frequency is set at every 5 years for pressure vessels where volume x pressure exceeds 3,000 litres x bar. These inspections must be carried out by a certified environmental expert.
Frequently asked questions about pressure vessel inspections
Why is a pressure vessel inspection important?
A pressure vessel inspection guarantees the safety and functionality of the pressure vessel and prevents dangerous situations.
Who is authorised to inspect pressure vessels?
Inspections may only be carried out by accredited environmental experts (VLAREM II).
What happens if my pressure vessel fails the inspection?
If a pressure vessel fails the inspection, a repair recommendation is issued. The vessel must then usually be re-inspected after a short period.
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