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Pressure devices

High-pressure lines
Radiographic test

Pressure devices are defined by the European "Pressure Device Directive" (PDD) 97/23/EC. The directive stipulates the requirements on the pressure devices for the introduction of pressure devices on to the market within the European Economic Area. Since May 29, 2002, PDD has already been binding throughout the European Union.

Tanks, steam boilers, pipelines, pressure-maintaining equipment parts and equipment parts with safety functions at an internal excess pressure of more than 0.5 bar are regarded as pressure devices in the terms of this directive. Pressure vessels are very frequently utilised in the field of Chemical plant engineering. Due to the particular hazard potential when pressure vessels are utilised, the manufacture and the operation are subject to stringent requirements.

In the case of pressure devices, a distinction must also be made as to whether these are operated with hazardous fluids (e.g. explosive, inflammable or toxic) or non-hazardous fluids. Extended safety requirements apply to the fabrication and commissioning of pressure vessels with hazardous fluids.

If a manufacturer introduces pressure devices on to the market as a functional unit with the necessary equipment parts with safety functions, this subassembly is governed by the Pressure Device Directive. This may include (for example): refrigerating installations, steam boiler installations, liquefied gas tank installations etc. Even a complete power station may be covered by the term if one responsible manufacturer builds the installation in a turnkey design.

Materials for pressure vessels must have properties which meet all the reasonably estimated and foreseeable operating conditions and all the testing conditions and, in particular, must have sufficiently high ductilities and toughnesses. In particular, the materials must be selected in such a way that no brittle fractures arise if necessary.  They must also exhibit an adequate chemical resistance to the fluids kept in the pressure device.

Three procedures are provided for the authorisation of materials for pressure devices: harmonised standard, European material authorisation or individual expert report.

Companies with activities within the scope of the Pressure Device Directive need welders with additional certification according to the Pressure Device Directive.

Via the Central Agency of the Federal States for Safety Technology (ZLS), GSI has a notification for the certification of personnel and permanent joints according to Article 13 of Directive 97/23/EC, implemented by the Device and Product Safety Act (GPSG) and the Ordinance Concerning the Introduction of Pressure Devices on to the Market (14th GPSGV).

Furthermore, we provide you with advice about all questions in the pressure vessel field, qualify your testing and monitoring personnel and stage a large number of conferences and courses on this subject. We are also a competent contact in the field of corrosion protection.

GSI provides you with support and advice with regard to all questions for everything to do with the subjects of materials, joining processes, testing procedures, corrosion protection as well as personnel qualification and training.

All over the world and everything from one source.

We are looking forward to you and your questions.