The present paper presents a systematic evaluation process of experimental work of uncertainty analysis. The experiment is considered a system composed entirely as a function of system method to obtain certain data. A systematic approach is set to estimate the uncertainty in these data in an arranged steps for rotary pumps such as centrifugal radial flow, axial flow, and mixed flow pumps. The paper presents the important values which should be carefully measured to obtain an accurate uncertainty value for laboratory tests and also, field tests for pump systems arrangement.