BS PD ISO/TR 12748:2015描述了使用WGFMs测量湿天然气流的生产流量 在水面和水下设施中。湿天然气流是以气体为主的流动，其中含有液体，如 水和/或碳氢化合物液体）。本技术报告定义了 术语/符号，解释各种概念，并描述湿气流量计设计的最佳实践 还有手术。它涉及计量技术、测试、安装、调试和操作 维护、校准和验证等实践。它还提供了一个理论背景 这是一种全面、具有挑战性且仍在发展的测量技术。测量湿天然气流量的一般方法有四种。下面详细介绍了每种方法。带校正系数的单相气体流量计:使用单相气体流量计（通常为 一种传统的气体流量计量装置），带有液体对气体流量影响的校正系数 计量系统。在这些情况下，确定校正系数所需的液体流速， 应该从外部来源进行估计。两相WGFM:气体和液体（包括水和碳氢化合物液体）的流速 在没有关于所需液体流速的额外外部信息的情况下进行预测。 这通常被称为两阶段WGFM，将在本技术报告中提及 简单地说就是WGFM。WGFM:一种测量气体和液体流量，以及气体、水和液体流量的流量计 烃液比（或“相分数”），无需关于 液体流速。相分离/相分离后的测量:这是一种传统和常规的方法 对于湿气流量计量，使用带有单相流量计的两相或三相分离器 测量输出单相流。这些方法中的前三种出现在过去二十年中，可以说是串联的 湿气流量测量，即使用WGFMs进行湿气流量测量，无需分离 气相和液相。本技术报告详细讨论了前三种方法。几个 已发布的湿气体流量，以及其他最佳实践 测量最后一种方法更为传统，描述了在气体和液体之后的湿气流量测量 各阶段已经分开。湿气流量计可用于多相流量计量系统，该系统 利用部分分离技术。本技术报告仅简要讨论了该方法。 交叉引用:ISO 5167-1ISO 5167-4ISO 5168ISO 10715ISO 12213ISO 14532ISO 15970ISO/TR 26762API RP 87ASME MFC报告19G:2008ISO/IEC 98-3:2008GUM:1995ISO 13443购买本文件时提供的所有现行修订件均包含在购买本文件中。

BS PD ISO/TR 12748:2015 describes production flow measurement of wet natural gas streams with WGFMs in surface and subsea facilities. Wet natural gas streams are gas-dominated flows with liquids like water and/or hydrocarbon liquids). This Technical Report defines terms/symbols, explains the various concepts, and describes best practices of wet gas flow meter design and operation. It addresses metering techniques, testing, installation, commissioning, and operation practices such as maintenance, calibration, and verification. It also provides a theoretical background of this comprehensive, challenging and still evolving measurement technology.There are four general methods in measuring wet natural gas flow. Each approach is detailed below.Single-phase gas flow meter with correction factor: Uses a single-phase gas flow meter (often a conventional gas flow metering device) with a correction factor for the effect of liquid on the metering system. In these cases, the liquid flow rate required to determine the correction factor, should be estimated from an external source.Two-phase WGFM: The gas and liquid (both water and hydrocarbon liquid combined) flow rates are predicted with no additional external information regarding the liquid flow rate required. This is generally known as a two-phase WGFM and will be referred to in this Technical Report simply as WGFM.WGFM: A flow meter that measures the gas and liquid flow rates, and also the gas, water and hydrocarbon liquid ratios (or "phase fractions") with no external information required regarding the liquid flow rate.Phase separation/Measurement after phase separation: This traditional and conventional method of wet gas flow metering uses a two- or three-phase separator with single-phase flow meters measuring the outgoing single-phase flows.The first three of these methods, which emerged in the last two decades, may be described as in-line wet gas flow metering, i.e. wet gas flow measurement is executed with WGFMs without separating the gas and liquid phases. This Technical Report discusses in detail these first three methods. Several best practice documents have already been issued to describe, among other topics, wet gas flow measurement.The last method is more conventional and describes wet gas flow measurement after the gas and liquid phases have been separated. Wet gas meters can be used in multiphase flow metering systems that utilize partial separation technologies. This method is only briefly discussed in this Technical Report.Cross References:ISO 5167-1ISO 5167-4ISO 5168ISO 10715ISO 12213ISO 14532ISO 15970ISO/TR 26762API RP 87ASME MFC Report 19G:2008ISO/IEC 98-3:2008GUM:1995ISO 13443All current amendments available at time of purchase are included with the purchase of this document.