API MPMS第14.3章/AGA第3号报告的这一部分已被开发为通过法兰分接同心孔板流量计计算天然气流量的应用指南，使用美国惯用（USC）英寸-磅单位制。对于涉及国际单位制（SI）的应用，可将转换系数应用于根据4.3中的方程式确定的结果（Qm、Qv、orQb）。单位的中间转换不一定会产生一致的结果。作为替代方案，可以使用API MPMS第14.3.1章/AGA第3号报告第1部分中规定的更通用的方法。必须按照API MPMS第14.3.2章/AGA第3号报告第2部分的要求建造和安装流量计。

This part of API MPMS Ch. 14.3/AGA Report No. 3 has been developed as an application guide for the calculation of natural gas flow through a flange-tapped, concentric orifice meter, using the U.S. customary (USC) inch-pound system of units.For applications involving international system (SI) of units, a conversion factor can be applied to the results (Qm, Qv, orQb) determined from the equations in 4.3. Intermediate conversion of units will not necessarily produce consistent results. As an alternative, the more universal approach specified in API MPMS Ch. 14.3.1/AGA Report No. 3, Part 1 can be used. The meter has to be constructed and installed in accordance with API MPMS Ch. 14.3.2/AGA Report No. 3, Part 2.