A transfer standard for flowmeter calibration provides traceability to a primary standard. It is typically used for most commercial calibrations because it represents an economically attractive alternative to a primary system. A set of critical flow venturi (CFV) transfer standards have been maintained in calibration at CEESI for the past 35 years. The uncertainty in mass flowrate has been estimated to be ±0.5 % at 95 % level of confidence based on analysis of the components that contribute uncertainty. This paper presents analysis of historical data that supports a lower estimate of uncertainty. HARDWARE CEESI maintains a set of critical flow venturis (CFVs) for use as secondary standards . The mass flowrate, qm, through a CFV is determined based on the following equation: q
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