NIST and other laboratories calibrate meters that measure the flow of valuable liquids such as petroleum products. Historically, these calibrations have been conducted using Stoddard solvent. Laboratories using Stoddard solvent for liquid-flow calibrations must contend with flammability, inhalation toxicity, and hazardous waste disposal requirements. In response to these health and safety concerns, we modified NISTs piston-prover flow standards so that calibrations are now conducted with mixtures of propylene glycol and water (PG + W). In this paper, we describe the modifications to NISTs calibration systems and our experiences in using the modified systems to calibrate turbine, positive displacement, and coriolis meters.
Proceedings Title: The 16th International Flow Measurement Conference FLOMEKO 2013
Conference Dates: September 24-26, 2013
Conference Location: Paris, -1
Conference Title: FLOMEKO 2013
Pub Type: Conferences
Liquid Flow Calibration, Propylene glycol, Stoddard solvent