Abstract Calibration acceptance criteria for pressure and temperature measuring devices used in orifice plate gas flowmeters were specified. The study was motivated by the introduction of a Brazilian regulation that specifies technical and legal requirements for in-field measurements of oil and gas flows. In compliance with international best practices, the applicable regulation, which establishes uncertainty levels for flow measurements (1.5% for fiscal/custody transfer measurements and 2% for appropriation measurements), did not set up limits of acceptance of uncertainties associated with pressure and temperature measuring devices. The effects of these uncertainties in measurements were evaluated. By making use of the Design of Experiments and Response Surface Method (RSM), acceptance criteria were sought to comply with the applicable regulation. The use of the methodology proved to be very useful as low uncertainties were obtained in all ten metering stations investigated. In the worst cases (in three stations only), uncertainties were lower than 0.2% of the correspondent full-scale reading. The response surface methodology also showed that the minimum measuring capacity to meet the regulatory uncertainty requirements are 0.05% for differential pressure calibrators and 0.01% for the static pressure (relative to the full-scale reading).

中文翻译：

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优化气体流量计压力和温度变送器验收校准标准的实验设计

摘要 规定了孔板式气体流量计中压力和温度测量装置的校准验收标准。该研究的动机是巴西出台了一项法规，该法规规定了油气流量现场测量的技术和法律要求。根据国际最佳实践，为流量测量确定不确定性水平的适用法规（财政/监管转移测量为 1.5%，拨款测量为 2%），没有设置与压力和温度测量相关的不确定性的接受限度设备。评估了这些不确定性在测量中的影响。通过使用实验设计和响应面方法 (RSM)，寻求符合适用法规的验收标准。事实证明，该方法的使用非常有用，因为在调查的所有十个计量站中都获得了低不确定性。在最坏的情况下（仅在三个站），不确定性低于相应满刻度读数的​​ 0.2%。响应面方法还表明，满足监管不确定性要求的最小测量容量对于差压校准器为 0.05%，对于静压（相对于满量程读数）为 0.01%。