There are two different methods concerning tank quality analysis. Method 1 consists of tank sample and lab analysis, an online analyzer at stream inlet, and outlet and model-based predictive calculations. A typical refinery lab analysis determines frequency per year and load distribution. Here, the cost is assessed, and the reduced load is justified. Method 2 uses an online analyzer. There is a process unit analyzer that can predict the quality of the rundown stream. An online blend analyzer checks quality at the inlet and exit of the tank. This topic will discuss methods to determine tank quality, method one tank sample and lab analysis, a method to determine sampling and lab analysis load, typical refinery lab analysis load distribution, the economics of lab analysis, the justification to reduce lab analysis load, method 2 – online process analyzers, process unit analyzers, online blending analyzers, method 2 – measuring tank inlet/outlet qualities, method-3 using models to predict tank qualities, etc.