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According to EN 1591-4 every technician must first acquire the basic skills for assembly and disassembly of threaded connections.

If necessary, further training may be required, for example for using hydraulic interlocking or for installation of specific connections, such as heat exchangers.

Course Content (selection)

The EN 1591-4 distinguishes at the "basic level of competence" in so-called core and awareness issues. The first must be understood and applied extensively. The latter need to be understood to such an extent that makes it possible to detect deviations from the rule.

  • Types of threaded connections
  • Functioning of gaskets
  • Correlation between bolt elongation, bolt force, surface pressure
  • Causes of the failure of threaded connections with gaskets
  • General health and safety precautions
  • Safe deinstallation of the connections
  • Storage, handling
  • Preparation of the sealing surface, detecting errors and defects
  • Orientation of the sealing surface
  • Effect of thread friction and significance of the lubricant at torque-tightening
  • Assembly exercise (with Fuji films)
  • Tightness requirements
  • Documentation of disassembly / assembly

Examination day

Examinations will commence upon completion of the second day of seminars. Following 30 minutes of preparation the written and practical tests will be conducted.

  1. Fundamentals of sealing technology
  2. Materials engineering
  3. Gasket characteristics
  4. Bolt calculations
  5. Calculation of flanges

Assembly training according to DIN EN 1591-4

Training provider:
Möller Metalldichtungen GmbH

Course goal:
Competence assessment of personnel for the assembly and disassembly of threaded Connections, covered by the Pressure Equipment Directive 97/23/EC (PED).

Training venue:
Training center of Möller Metalldichtungen GmbH
Brunnenweg 10,
39444 Hecklingen

Engineers and application technicians of the
Möller Metalldichtungen GmbH

Training duration:
1,5 days theoretical and practical training

max. 10 participants

Course completion (certificate):
The personal certificate is issued by TÜV SÜD.

Further information: brochure on our assembly training course

Training opportunities

Module 1: Fundamentals of Sealing Technology

Course Goal: The first module explains the general principles of sealing technology, regardless of the type of gasket, and other components such as bolts and flanges. The particular goal is to understand, which characteristics a gasket must have in order to guarantee the long lasting tightness required.

Module 2: Materials Engineering

Course Goal: This module explains the properties of the various materials used in gaskets. The module covers materials such as elastomers, fibres, PTFE and graphite, as well as metal/ soft material gaskets.

Module 3: Gasket parameters and supplementary standards and regulations

Course Goal: This module concentrates on gasket characteristics for flat gaskets and on criteria for the comparability of certain types of gaskets. Since these characteristics are required in other regulations, they are briefly described. At class we will work directly with those regulations.

Module 4: Bolt calculations

Course Goal: The module will primarily provide an understanding of the functioning of interlocking connections. It demonstrates calculations based on AD 2000 leaflet B7. Then, a calculation based on current characteristic values ​​according to DIN EN 13555 and following AD 2000 leaflet B7 will be explained. Finally, we discuss the standard procedure for calculations according to DIN EN 1591-1.

Module 5: Assembly training according to E DIN EN 1591-4:2011-11

Course Goal: Assessment of the qualifications of assembly technicians for the assembly and disassembly of threaded connections covered by the Pressure Equipment Directive 97/23/EC (PED).