Volumetric tube calibration is an important process of the traceability of flowmeter, but the standards and benchmarks are different from each other in the countries, leading to the inconvenience for the users. In this paper the main technical contents between the domestic JJG regulations and international API standards for volumetric tube calibration are firstly compared. Then we systematically analyzes the volume value of the volumetric tube and repeatability calculation model. Based on the validation for the calibration data of the piston type volumetric tube in one foreign oil field, we demonstrate that the difference between the standard volume value calculated by the two standards (specifications) is very small (1ppm) but the repeatability has large difference (up to 200 ppm). The number of measurements has a direct impact on the repeatability. The repeatability differences of the API standard and the JJG standard are 50 ppm and 179 ppm, respectively. The analysis indicates the differences arise from Bessel formula of the JJG standard and the polarization method of the API standard free of the polarization coefficient and confidence probability. Through theoretical derivation and data validation, the coefficient of polarization and confidence probability can be reduced to the repeatability calculation formula to obtain a universal counteraction method. For the n≥5 measurements between API standards and JJG regulations, repeatability differences are small. This work can provide reference for the future revision of the regulations and method selection.