{"id":291844,"date":"2024-10-19T19:49:08","date_gmt":"2024-10-19T19:49:08","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-5857-2-11980\/"},"modified":"2024-10-25T16:52:37","modified_gmt":"2024-10-25T16:52:37","slug":"bs-5857-2-11980","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-5857-2-11980\/","title":{"rendered":"BS 5857-2.1:1980"},"content":{"rendered":"

This International Standard deals with the measurement of gas flow in conduits by using tracer methods.<\/p>\n

In a steady flow of compressible fluid, the only conservative parameter is the mass rate of flow qm<\/sub><\/i>. Therefore the whole of this International Standard will refer to mass rate of flow qm<\/sub><\/i>.<\/p>\n

However, for those fluids for which the composition (and therefore, the mass density) may not be known accurately, the volume rate of flow qv<\/sub><\/i> could be measured, it being understood that this volume rate of flow is only valid for the conditions of temperature and pressure at which it has been measured.<\/p>\n

This International Standard applies to flow measurement in conduits into which a tracer can be injected in such a way that effective mixing in single phase with the gas flowing in the pipe can be achieved.<\/p>\n

The fluid in the conduit can be a mixture of several gases provided the thermodynamic state and conditions of flow of this mixture are well defined.<\/p>\n

Two fundamental test procedures are used:<\/p>\n