Periodic inspection is our core business
Periodic inspection
Periodic inspection is carried out in accordance with rigorous regulations by operators qualified through approved inspection bodies.
1. Retesting
![Reliquats](https://prestacylinders.lu/wp-content/uploads/2014/12/reliquats.jpg)
Residual gas inspection
Once the cylinders have been depalletized, the presence of residual gas in cylinders is detected automatically. Gas residues are recovered via a closed circuit to ensure the environment is optimally protected.
![Démontage du robinet](https://prestacylinders.lu/wp-content/uploads/2014/12/derobinetage.jpg)
Valve disassembly
Valves are disassembled in a semi-automatic way. Each valve is then inspected by an expert to check if it can be reused.
![Contrôle de la résistance en pression](https://prestacylinders.lu/wp-content/uploads/2014/12/pression.jpg)
Pressure resistance inspection
The cylinders are transferred to a carousel where they undergo a water pressure test. The pressure applied varies from 15 to 50 bars depending on the type of cylinder.
![](https://prestacylinders.lu/wp-content/uploads/2014/12/four.jpg)
Furnace process
The cylinders are then transferred to a 30 metre-long furnace, set at 700°C, for paint to be burned off. This furnace, equipped with a filter and post-combustion smoke treatment system, meets European airborne emission requirements.
![Grenaillage](https://prestacylinders.lu/wp-content/uploads/2014/12/grenaillage.jpg)
Shotpeening
The cylinders then undergo surface shotpeening to make the metal surface as clean as possible for optimal visual inspection.
![Contrôle visuel externe](https://prestacylinders.lu/wp-content/uploads/2014/12/controle_visuel.jpg)
External visual inspection
This visual inspection forms a vital part of the retesting process. It is carried out by highly-specialized operators.
These operators are checked regularly by a representative from a duly-approved inspection body, who is based permanently on the site.
The cylinders are then sorted into three main categories:
- cylinders accepted,
- cylinders refused,
- cylinders with repairable flaws. The latter are transferred to repair facilities.
2. Repairs
![Compétences de Presta Cylinders](https://prestacylinders.lu/wp-content/uploads/2014/12/Competences.jpg)
Presta Cylinders expertise
- Handle repair
- Base repair
- Flange repair
- Collar repair
- Dent repair
![Débosselage](https://prestacylinders.lu/wp-content/uploads/2014/12/debosselage.jpg)
Dent removal
Cylinders with indentations that are accepted by industry standards can be repaired.
A large number of cylinders can be put back into circulation when dents are removed.
![Redressement de pieds](https://prestacylinders.lu/wp-content/uploads/2014/12/redressement.jpg)
Base straightening and replacement
Presta Cylinders straightens bases that have repairable flaws or replaces them to ensure the cylinder is vertically stable.
![Réparation de poignées et de collets](https://prestacylinders.lu/wp-content/uploads/2014/12/reparation.jpg)
Handle and collar repair and replacement
Cylinder origin data is specified on the fixture newly-welded to the cylinder and is save in our information system. This ensures that cylinders can be traced pursuant to regulations in effect.
![Remplacement de frettes](https://prestacylinders.lu/wp-content/uploads/2014/12/frettes.jpg)
Flange replacement
The external thread of the flange, where the cap is screwed on, is systematically checked and, when necessary, replaced.
3. Completion
![Métallisation](https://prestacylinders.lu/wp-content/uploads/2014/12/metallisation.jpg)
Metalizing
By metalizing the cylinders by spraying molten zinc on their surface ensures that the steel is optimally protected against rust.
![Peinture](https://prestacylinders.lu/wp-content/uploads/2014/12/peinture.jpg)
Painting
The 100% polyester thermosetting powder paint that Presta Cylinders uses ensures that the result is perfect in all respects.
This process is also environmentally-friendly:
Airborne emission-free, smell-free, waste-free. Thermosetting powder paints are solvent and heavy metal-free and do not need to be mixed with thinner or water to be used.
The powder paints used have considerably improved operators’ working conditions: low toxicity, reduced risk of fire, ease-of-use.
![Inspection interne](https://prestacylinders.lu/wp-content/uploads/2014/12/inspection_interne.jpg)
Internal inspection
Internal visual inspection is carried out using a powerful LED light. This is used to ensure that no impurity or water residue remains in the cylinder prior to mounting the valve.
![Montage du robinet](https://prestacylinders.lu/wp-content/uploads/2014/12/montage_robinet.jpg)
Valve mounting
The valves, adapted to each type of cylinder manufactured, are coated with a sealant and manually prescrewed. The valves are then put through an automatic valve machine that automatically tightens the valves to the torque required and ensures it is well oriented.
![Pesage](https://prestacylinders.lu/wp-content/uploads/2014/12/pesage.jpg)
Weighing
Cylinder overfilling is prohibited for safety reasons. To ensure that the tare weight specified on the cylinder is correct, Presta Cylinders uses an exclusive weighing system.
![Marquage au jet d’encre](https://prestacylinders.lu/wp-content/uploads/2014/12/encre.jpg)
Inkjet marking
Some data, known as “variable” (tare weight and date for the next retesting) must be visible on the cylinder or on a fixture and must be sustainably legible. Presta Cylinders uses an inkjet process to ensure this.
![Sérigraphie](https://prestacylinders.lu/wp-content/uploads/2014/12/serigraphie.jpg)
Serigraphy
To customize cylinders, we use a last-generation serigraphy machine to high-quality print customer logos.
![Tampographie](https://prestacylinders.lu/wp-content/uploads/2014/12/Tampographie.jpg)
Pad printing
Our pad printing system prints safety markings and customizes cylinders based on customer requirements.