Raff + Grund has a large number of test instruments, measuring equipment and test setups for testing the components and for checking and documenting the required finish. Before delivery the components are tested by our quality representatives and the results are documented. An in-house FAT of the plant is also possible at Raff + Grund. We can also assist you with validation / qualification, such as the IQ or OQ.


The following in-house tests and documentation are possible at Raff + Grund:

  • Dimensional check and visual inspection using calibrated measuring instruments
  • Surface roughness measurement using calibrated measuring instrument
  • Dye penetration test to EN 473 / ISO 9712 level 2
  • Pressure test with calibrated pressure gauge and TÜV acceptance
  • Pickling and passivation report
  • Electropolishing report
  • Ferrite content measurement in the weld using calibrated measuring instrument
  • Videoendoscopy of piping
  • Spectral analysis for material determination
  • Riboflavin test to VDMA leaflet for checking the cleanability of the vessel
  • Drain test to ASME-BPE
  • Weld documentation (WPS)
  • FAT (Factory Acceptance Test), IQ/OQ
  • Agitation tests
  • Helium leakage test
  • X-ray/ultrasound measurement of the weld (by external partners)


We naturally have a quality management system to EN ISO 9001:2008 and an environmental management system to EN ISO 14001:2004. We are approved for the construction of pressure vessels to ISO 3834-3 (HP0 - AD2000) and are a specialist company to §19.1 WHG (German Water Management Law). In addition, we have the manufacturer qualification for the welding of steel components to DIN18800-7 Cl. B. The approvals are listed on our QA Approvals page.