One other design feature of all Self Bunded HOST Tanks is that the unit rests on only the four corner posts.
Each corner post is hydraulically tested to 400 tons. This means that the tank bottom does not sit on the ground as most people assume. Therefore there is very little possibility that rust or corrosion will occur on the bottom of the tank. A good sand blast preparation and a solid bitumen coating will let the tank sit without problems for many, many, years. Use of world acclaimed paints and painting methods also assure that paint coatings can and are warranted for between 5 and 15 years, depending on the location and operation/maintenance of the tanks.