Process model for the performance prediction of Stommel Upwelling Pipes (SUP), which operate on the basis of the "Perpetual Salt Fountain" principle, described by Stommel et al. (1953) [ https://doi.org/10.1016/0146-6313(56)90095-8 ]. The model solves for a steady-state pressure and heat balance on a one-dimensional grid. A full description of the model is given in Kemper et al. (2023) [ http://dx.doi.org/10.23967/marine.2023.018 ]