In the world of process safety, we have Safe Upper and Lower limits on a lot of common process parameters, such as pressures, levels, temperatures, etc. Flows on the other hand are quite often overlooked as a critical process parameter and when your HHC/EHS is a non-conductive flammable liquid both FLOW and LEVEL must be addressed within the facility’s PSI and SOPs. This article will discuss how a safe upper limit on flow and safe lower limit on level can play a huge roll in improving flammable liquid safety and quite possibly PSM/RMP compliance.