Properties of Selected Pump Shaft Materials for Multiphase Applications

In multi-phase applications predictable equipment reliability is of great importance to keep maintenance costs as low as possible. The pump shaft as a rotating part is a key element in this regard. Mechanical loads act together with corrosive attack. Both, the mechanical and the chemical requirements increased markedly with the introduction of multi-phase pump technology.
In a joint project between Bornemann and Schmidt + Clemens environmental corrosive conditions have been collected and mechanical loads on the pump shaft identified. On the materials side a process has been defined to select materials, which meet these requirements.
Three materials and their properties are described in more detail, because they have been selected as candidate materials. They are most likely to withstand for long times even in subsea applications.