b'PIPELINE EMERGENCY RESPONSE GUIDELINESFixed Roof or Cone Roof Atmospheric Storage Tanks The third is a fixed roof tank, known as a cone or flat roof. Other type of roofs found in low-pressure tanks are various small containers in tank batteries at the wells, processing and transmission throughout the pipeline system.Refined ProductsNational Heating Oil Reserve in the Northeast42 2022 by Pipeline Association for Public Awareness'