{"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 The advantages and disadvantages of these two methods are considered in clause 4<\/b>. The distance between injection and measuring sections shall be sufficient to achieve mixing of the tracer with the gas flowing in the conduit according to the methods; the adequate mixing distance is considered in clause 6<\/b>.<\/p>\n A large number of different tracers may be used, such as radioactive or non-radioactive, mineral or organic materials. The choice of tracer depends on the circumstances of the measurement (see clause 5<\/b>). The uncertainty of the measurements may be less than 1 % under good conditions (see clause 7<\/b>).<\/p>\n Compares the dilution method with the method based on transit time measurement. Also covers choice of tracers and measuring\/mixing lengths.<\/p>\n","protected":false},"excerpt":{"rendered":" Methods for measurement of fluid flow in closed conduits, using tracers. Measurement of gas flow – General<\/b><\/p>\n\n
\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n BSI<\/b><\/a><\/td>\n 1980<\/td>\n 18<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":291850,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[264,2641],"product_tag":[],"class_list":{"0":"post-291844","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-120-10","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/291844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/291850"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=291844"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=291844"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=291844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}