- European Congress on Fluid Machinery for the Oil, Petrochemical, and Related Industries (4)
- Institution of Mechanical Engineers (Great Britain). Power Industries Division (3)
- Institution of Mechanical Engineers (Great Britain). Fluid Machinery Committee (2)
- Koninklijk Instituut van Ingenieurs (Netherlands) (2)
- Royal Dutch Institution of Engineers. Division of Mechanical Engineering (1)
- Royal Dutch Institution of Engineers. Division of Naval Architecture (1)