Spacing and Diking for
Atmospheric and Low-Pressure Tanks

This Standard provides the minimum mandatory requirements for spacing and diking of tanks located onshore and above grade that store or process flammable or combustible liquids at atmospheric and at pressures up to 100 kPa(ga) (15 psig) and temperatures at or above ambient. Tanks include vertical cylinders with fixed or floating roofs, horizontal cylindrical drums, spheres, spheroids, and any other configuration used for the above purpose and designed per the requirements of SAES-D-100 or SAES-D-109. For refrigerated storage vessels, or for pressure storage vessels designed to store flammable materials per the requirements of SAES-D-001, refer to SAES-B-057.