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Title: Inside Diameter Measurements For The Cylinder Of A 20 L Piston Prover
Author: Jesus J. Aguilera, T. T. Yeh, John D. Wright
Source: 2006 International Symposium on Fluid Flow Measurement
Year Published: 2006
Abstract: We made inside diameter measurements of a stainless steel cylinder used in a piston prover for hydrocarbon liquid flow measurements. We used a 3-point micrometer and two traceable setting rings to measure diameter at 12 radial positions at each of 21 lengthwise positions, on three different occasions. The diameter measurements showed a change in diameter (taper) of about 20 m near the middle of the cylinder and non-circularity at one end. These shape imperfections lead to a diameter uncertainty of 6 m (k2) for the cylinder in its present form. This amounts to 75 parts in 106 uncertainty in the cross sectional area or flow measurements. The cylinder will be re-honed to improve the uniformity of diameter along the length and chrome plated to increase the surface hardness (to prevent scratches). Based on the measurements presented herein, diameter uncertainty of 2 m or less appears attainable by this measurement approach (26 parts in 106 for flow).

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