1.1范围1。1.1本标准描述了允许准确且可重复测定封闭气流中颗粒质量流量的试验程序和设备。它适用于在气体净化设备（性能测试）之前和之后，或在气流排放到大气中之前使用。笔记建议本标准中的测试程序由经过培训且经验丰富的空气污染控制工作人员执行，如附录A.1.1.2所述。本标准可作为评估改进取样程序的基础。注:其中一个修改是附录C.1.2中描述的管道内过滤方法1。2.1人们认识到，许多过程和情况可能会限制本试验程序的应用。具体而言，在处理以下任何情况时必须谨慎:（a）腐蚀性或高反应性部件；（b） 高真空或高压力； 或（c）高温流动。1.2.2在遇到以下条件的过程中可能会出现复杂情况:（a）高含水量流；（b） 低速流动；（c） 小管道横截面（小于0.02米（0.2英尺？）；（d） 取样站前后直管长度不足导致复杂的流型；或（e）由于不可控制的过程变化而引起的速度、颗粒负荷和温度波动。注:附录B中给出了此类非标准条件下的测试指南。

1.1Scope1.1.1This Standard describes test procedures and equipment which will permit accurate and reproducible determination of the particulate mass flows in enclosed gas streams. It is intended for use both before and after gas cleaning equipment (performance testing) or prior to emission of the gas stream into t he atmosphere.Note. It is recommended that the testing procedures in this Standard be undertaken by trained and experienced personnel in air pollution control work as noted in Appendix A.1.1.2This Standard may be used as a basis for evaluating modified sampling procedures.Note: One such modification is the in-duct filtration method described in Appendix C.1.2Limitations1.2.1It is recognized that there will be many processes and situations which may limit the application of this test procedure. Specifically, caution must be exercised when dealing with any of the following:(a) Corrosive or highly reactive components; (b) High vacuum or pressure; or (c) High temperature flows.1.2.2Complications may arise in processes where the following conditions are encountered:(a) High moisture content streams; (b) Low velocity flows; (c) Small duct cross-sections (less than 0.02 m? (0.2 ft?)); (d) Complex flow patterns due to inadequate lengths of straight pipe before or after the sampling station; or (e) Fluctuations in velocity, particulate loading and temperature, due to uncontrollable process variations.Note: Guidelines for testing under such non-standard conditions are given in Appendix B.