ABSTRACT

As the value of scarce fluid resources increases in today's domestic and international market places and process industries so does the need for improved fluid measurement and for improved traceability to primary standards. The calibration facilities which flow gas and which are currently in use at the National Bureau of Standards are described. The application of this concept to fluid measurement is presented together with strategies and techniques for establishing Measurement Assurance Programs for flow measurements. The measurements are called "static" as both volume and density changes can be measured at presumably stationary conditions. Collection volume capacity is derived from weighed gaseous nitrogen fillings of the tank in conjunction with density as determined from temperature and pressure measurements. Accuracy of flow measurement is defined as the total uncertainty which consists of the sum of the systematic error, or bias, and the precision. Careful attention to numerous details is necessary to avoid measurement difficulties.