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Title: Development Of A 500 Slm High Speed Piston Prover
Author: Harvey Padden
Source: Flomeko 2007
Year Published: 2007
Abstract: Piston provers have traditionally been used for flows below approximately 50 slm. Above that level, bell provers, which are much slower and less convenient to operate, have been used. We sought to experimentally establish the feasibility of very high-speed viscous-sealed piston provers for flows up to 500 slm. The difficulties to be overcome in building a prototype included: Constructing a 152 mm by 600 mm piston-cylinder pair with a clearance of approximately 25 microns along the full stroke Procuring valves with low enough restriction (Cv) to allow gravity reset Detecting piston position optically Accounting for effects of the pistons low resonant frequency and other dynamic effects We constructed such a prover and conducted numerous experiments to characterize the internal pressure (hence, piston motion) characteristics during the cycle. The prototype was then tested at NIST against sonic nozzles over a flow range of 10 slm to 500 slm. The prover exhibited linearity agreement to approximately 0.04%, with 0.05% or better reproducibility in a second run. Based upon these data and upon further uncertainty analyses, our conclusion is that very high speed 500 slm provers can be constructed with combined standard uncertainties of better than 0.1%.

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