Regarding the placement of flammable storage relative to a process area, which statement is correct?

• A. Store uphill
• B. Store downhill
• C. Store at the same level
• D. Placement is not a factor

Answer: (B)

The main idea here is using the layout of flammable storage to control spills and potential vapor spread. Placing flammable storage downhill from a process area takes advantage of gravity to move any leaked liquid away from critical equipment and toward a drainage or containment path. This helps prevent a spill from reaching the process area and reduces the chance that ignition sources near the process area will be exposed to flammable liquid. If storage were uphill or at the same level, a leak could flow toward or pool near the process area, increasing risk. Saying placement isn’t a factor ignores a practical safety measure that helps keep flammable materials isolated from the process zone.