The document describes the process of replacing three direct porosity plugs (DPPs) in a refinery vessel in Asia Pacific. Key steps included: removing the used plugs and surrounding bricks; installing new surrounding bricks and mortaring them in place; centering and ramming a new porous plug into the vessel; and connecting hoses to the new plugs. The work was carried out by a project team led by manager Heinz Wieduwilt to protect purging channels in the vessel.