BEASY Software and Services



This paper describes application of simulation to a specific case in which significant corrosion (in the form of perforations –aligned with uncoated welds) had been detected in a lined CS seawater lift pump (SWLP) caisson. The coated CRA pump column and SDSS pump bowls were fitted with galvanic anodes. The holes had then subsequently been trepanned and covered with SS plates with sealing gasket. However, the holes had continued to grow. Fatigue assessment indicated the need to restrict hole size to less than 350mm. During withdrawal of the SWLP column for maintenance, very poor coating condition was found.

Modelling was used to inform the retrofit CP design, and to determine the limiting size of perforation of the caisson. It was selected to assist understanding of the behaviour of different materials (under high flow rate condition); restrictions to current flow in the narrow annular gap between pump and caisson; a combination of discrete and uniform coating damage areas; complex structural geometries, and used survey measurements to capture the effects of the external CP system (fitted to the associated jacket). The models demonstrated that the edges of the holes could be protected and holes would reach a maximum size that was less than the structurally critical level. The model was used to establish the likely corrosion rate on the exposed steel area at the welds, and the effectiveness of alternative CP designs (and coating re-conditioning strategies).

Key words: Cathodic Protection System, pump caisson, CRA, Super Duplex stainless steel, BEM

To get the full publication please Open the Publication Below

Open Here

Here are a series of case studies for the types of projects BEASY have helped with worldwide.

To download BEASY case studies we require data from you, please fill in the form provided and the material will become available to download

Please note that by submitting these details you are giving us permission to contact you further to validate that the material fully addressed your requirements.
We will not pass your details on to any third party organisations.

Request Information

To request more information on:

  • BEASY software products
  • Consultancy & Engineering
  • BEASY support services
  • Training
  • R&D and Customisation

See our Request Information Form

Newsletter Sign-up

Areas of Interest

Please note that by submitting this form you are giving us permission to store the details you have entered above in our database system.  We will use this data to add you to our mailing list to receive the monthly BEASY e-newsletters you have selected. You can remove yourself from the e-newsletter mailing list at anytime by choosing the opt-out feature on the e-newsletter. We may also send you literature about BEASY via postal mailings and any other BEASY information and announcements which we think you will find of interest. We will not pass your details on to any 3rd party organisations.

Follow Us!

To download BEASY documents we require data from you, please fill in the form provided and the material will become available to download