Certificates and quality guidelines

We manufacture

  • according to pressure equipment directive as well as the regulations of AD2000, TRD or customer-specific guidelines
  • with welding procedures E (111), WIG (141), UP (121), MAG (135, 136)

We use

  • certified welding devices and personnel according to DIN EN ISO 9606-1 / DIN EN ISO 14732. The inspections include sheet metal and tube processing. 

We process

  • unalloyed structural steels according to DIN EN 10025 , e.g. S235JR and S355J2
  • structural steel for boiler processing as e.g. P235GH, P265GH, P295GH, P355GH, 16Mo3, 13CrMo4-5, 10CrMo9-10
  • fine-grained steels e.g. S690QL
  • heat-resistand steels according to DIN EN 10095
  • stainless steels

In the following you may find certificates of WEHRLE-WERK AG, WEHRLE Umwelt GmbH and ECOTHERM AG.


           DIN EN ISO 9001 - Quality Management System


          DIN EN ISO 14001 - Environmental Management System

WEHRLE legt größten Wert auf Arbeitsschutz


          NLF/ILO-OSH 2001 Occupational Safety and Health
          Protection Management System 


            Manufacturer of steel structures up to EXC4 according
            to DIN EN 1090


            Admission according to AD2000 HP 0 / TRD 201 / EN
            12952-5 and DIN EN 3834-2 regarding processing of
            pressure equipment corresponding to pressure
            equipment directive 97/23/EG