- ABB Kraftwerke AG, Mannheim, Germany
- ABB Power Generation, Baden, Germany
- Adams, Herne, Germany
- AEL, Leising, Germany
- AEL Apparatebau Leisnig, Germany
- Aerzner Maschinenfabrik, Aerzen, Germany
- Air System Barlage, Flechum, Germany
- Albrecht, Lindlar, Germany
- Alstom, Baden, Germany
- Aluminium Rheinfelden, Rheinfelden, Germany
- Ansaldo, Genoa, Italy
- Armaturenwerk Halle, Germany
- Ari Armaturen, Holte-Stukenbrock, Germany
- Atlas Copco, Köln, Germany
- Aura, Gemershain, Germany
- Austrian Energy, Vienna, Austria
- Babcock IKR, Eberswalde, Germany
- Babcock Borsig Power Energy, Berlin, Germany
- Babcock Hitachi, Oberhausen, Germany
- Balcke Dürr, Ratingen, Germany
- BAM, Kürten, Germany
- BASF, Ludwigshafen, Germany
- Bayer, Leverkusen, Germany
- Bayer, Grosse Ledder, Germany
- Bayer, Uerdingen, Germany
- Bayer Technology Services, Krefeld, Germany
- Bayer, Wermelskirchen, Germany
- BBM Gerb Akustik GmbH, Essen, Germany
- BBP,Oberhausen, Germany
- BBP, Schkeuditz, Germany
- Bertsch, Bludenz, Austria
- BHR Hochdruck GmbH, Essen, Germany
- Böhmer, Sprockhövel, Germany
- Bokela, Karlsruhe, Germany
- Bopp & Reuther, Mannheim, Germany
- Bureau Veritas, Paris, France
- Bureau Veritas, Istanbul, Turkey
- Burkhardt Compression, Winterthur, Switzerland
- Büttner, Germany
- Calorifer, Elgg, Switzerland
- CCI, Winterthur, Switzerland
- Choren, Freiberg, Germany
- CNE-Prod Cernavoda, Cernavoda, Romania
- Coperion Waeschle, Weingarten, Germany
- Dillinger Hütte, Dilingen, Germany
- Eckardt, Stuttgart, Germany
- Eisenbau Krämer, Hilchenbach/Dahlbruch, Germany
- Electronuclear, Rio de Janeiro, Brazil
- Essener Hochdruck Rohrleitungsbau, Essen, Germany
- Ferrostaal, Essen, Germany
- FK Wärmetauscher Kemmerling, Wickede, Germany
- Flowserve Flow Control, Ettlingen, Germany
- Flowserve Essen, Essen, Germany
- Framatome, Erlangen, Germany
- Funke, Gronau, Germany
- GEA, Ettlingen, Germany
- GEA Luftkühler, Herne, Germany
- GEA Tuchenhagen, Büchen, Germany
- GEA Westfalia, Oelde, Germany
- Gestra, Bremen, Germany
- Gestra, Würzburg, Germany
- Haffmans, Venlo, The Netherlands
- Heatric, Poole, England
- Hora, Schloß Holte-Stukenbrock, Germany
- Hydac, Sulzbach, Gerrmany
- Igema, Aachen, Germany
- IGN,Greifswald, Germany
- Ineos Phenol, Gladbeck, Germany
- ITT Richter, Kempen, Germany
- Izhorskiye Zavody, St. Petersburg, Russia
- Zielke, Dresden, Germany
- Ziemann und Bauer, Bürgstadt, Germany
- Zimmer AG, Frankfurt, Germany
| - Kernkraftwerk, Leibstadt, Germany
- Kernkraftwerk, Mühlenberg, Germany
- Körting Hannover AG, Hannover, Germany
- Koor Metals, Kiryat Tivon, Israel
- Kraftanlagen, Heidelberg, Germany
- Krämer, Hilchenbach, Germany
- Kress, Offenbach, Germany
- Krupp Uhde GmbH, Bad Soden, Germany
- Krohne Messtechnik, Duisburg, Germany
- KSB, Frankenthal, Germany
- KSB, Pegnitz, Germany
- Küttner, Essen, Germany
- Lentjes Energietechnik, Essen, Germany
- Lewa Leonberg, Germany
- Linde, Dresden + Höllriegelskreuth, Germany
- Linde, Pullach, Germany
- Lurgi, Frankfurt, Germany
- MAG, Grimma, Germany
- MAN Turbomaschinen AG, Berlin + Oberhausen, Germany
- Mannesmann Demag, Berlin, Germany
- Mannesmann Stahlflaschen, Dinslaken, Germany
- Nem, Graz, Austria
- Noell Nuclep S.A., Itaguaj, Brazil
- Ohl Apparatebau & Verfahrenstechnik, Limburg, Germany
- Oschatz, Essen, Germany
- Outotec, Oberursel, Germany
- Pall, Crailsheim, Germany
- Paul Wurth, Luxembourg
- Pitton+Gessner-Landruf, Freudenberg, Germany
- Rieter Automatik, Großostheim, Germany
- Renzmann, Monzingen, Germany
- RWTÜV, Essen , Germany
- Saarschmiede, Völklingen,Germany
- Samson, Frankfurt, Germany
- Schoeller Bleckmann Nitec GmbH, Ternitz, Austria
- Schott, Landshut, Germany
- Schweißtechnische ZA, Vienna, Austria
- SCIN, Sfax, Tunisian Republic
- Selas Linde, Pullach, Germany
- Sensycon, Alzenau, Germany
- Sempell, Korschenbroich, Germany
- Shell, Gummersbach, Germany
- Siekmann, Dortmund, Germany
- Siekmann, Zwenkau, Germany
- Siemens KWU, Erlangen, Germany
- Siemens KWU, Mülheim, Germany
- Siemens KWU, Offenbach, Germany
- Siemens, Freiburg, Germany
- Siemens, Mülheim a.d. Ruhr
- Siemens, Görlitz, Germany
- Siempelkamp, Krefeld, Germany
- Skodock, Garbsen, Germany
- Skoda, Plzen, Czech Republic
- SLV Duisburg, Germany
- SLV Hannover, Germany
- Socomenin, Sfax, Tunisian Republic
- Stahl Armaturen Persta GmbH, Warstein, Germany
- Steag, Essen, Germany
- Sulzer, Winterthur und Basel, Switzerland
- SVS, Switzerland
- SVTI, Wallisellen, Germany
- Technip, Düsseldorf, Germany
- Thermoprozess, Mülheim, Germany
- TÜV Akademie Nord / Berlin / Hannover, Germany
- TÜV Bayern, Germany
- TÜV Akademie Rheinland, Germany
- TÜV Akademie Westfalen, Germany
- Uhde, Dortmund, Germany
- Uhde, Bad Soden, Germany
- Uhde Inventa Fischer GmbH, Berlin, Germany
- Viessmann, Berlin, Germany
- Vitkovice AS, Ostrava, Czech Republic
- Wacker Chemie AG, Burghausen, Germany
- Welland & Tuxhorn, Bielefeld, Germany
- Westinghouse, Nivelles, Belgian
- York, Hamburg, Germany
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