{"id":265230,"date":"2024-10-19T17:41:29","date_gmt":"2024-10-19T17:41:29","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iso-21360-32019\/"},"modified":"2024-10-25T13:37:46","modified_gmt":"2024-10-25T13:37:46","slug":"bs-iso-21360-32019","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iso-21360-32019\/","title":{"rendered":"BS ISO 21360-3:2019"},"content":{"rendered":"<p>This document specifies methods and special requirements for measuring the maximum tolerable pressure difference, effective compression ratio, compression ratio with zero throughput and overflow valve pressure difference of mechanical booster vacuum pumps.<\/p>\n<p>It applies to mechanical booster vacuum pumps employed for medium vacuum or rough vacuum applications including gas-cooled mechanical booster vacuum pump and multiple mechanical booster vacuum pump systems.<\/p>\n<p>It covers particular characteristics of mechanical boosters that are different from those of the usual positive displacement vacuum pumps. Maximum tolerable pressure difference \u0394<i>p<\/i><sub>max<\/sub>, effective compression ratio <i>K<\/i><sub>eff<\/sub>, compression ratio with zero throughput <i>K<\/i><sub>0<\/sub> and overflow valve pressure difference \u0394<i>p<\/i><sub><sub>1<\/sub><\/sub> are special characteristics of the performance of mechanical booster vacuum pumps.<\/p>\n<h4>PDF Catalog<\/h4>\n<table border=\"1px\" class=\"des-table\">\n<tr>\n<th>PDF Pages<\/th>\n<th>PDF Title<\/th>\n<\/tr>\n<tr>\n<td><b>2<b><\/td>\n<td>National foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>6<b><\/td>\n<td>Foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>7<b><\/td>\n<td>Introduction  <\/td>\n<\/tr>\n<tr>\n<td><b>9<b><\/td>\n<td>1 Scope <br \/> 2 Normative references <br \/> 3 Terms and definitions  <\/td>\n<\/tr>\n<tr>\n<td><b>10<b><\/td>\n<td>4 Symbols  <\/td>\n<\/tr>\n<tr>\n<td><b>11<b><\/td>\n<td>5 Measurement conditions <br \/> 6 Experimental setup <br \/> 6.1 General <br \/> 6.2 Schematic diagram  <\/td>\n<\/tr>\n<tr>\n<td><b>13<b><\/td>\n<td>6.3 Test dome on test pump <br \/> 6.4 Buffer volume on backing line <br \/> 6.5 Vacuum gauges <br \/> 7 Test methods <br \/> 7.1 Measurement of maximum tolerable pressure difference, \u0394pmax <br \/> 7.1.1 General <br \/> 7.1.2 Measuring method <br \/> 7.1.3 Measuring procedure  <\/td>\n<\/tr>\n<tr>\n<td><b>14<b><\/td>\n<td>7.1.4 Measurement uncertainty <br \/> 7.1.5 \u200bEvaluation of the measurement <br \/> 7.1.6 Test report <br \/> 7.2 Measurement report of compression ratio K0 <br \/> 7.2.1 General <br \/> 7.2.2 Test report <br \/> 7.3 Measurement of the effective compression ratio Keff <br \/> 7.3.1 Backing pump selection <br \/> 7.3.2 Test report  <\/td>\n<\/tr>\n<tr>\n<td><b>15<b><\/td>\n<td>7.4 Measurement of overflow valve pressure difference \u0394p1 <br \/> 7.4.1 General <br \/> 7.4.2 Determination of overflow valve pressure difference <br \/> 7.4.3 Measuring method <br \/> 7.4.4 Measuring procedure <br \/> 7.4.5 Overflow valve opening <br \/> 7.4.6 Measurement uncertainty <br \/> 7.4.7 \u200bEvaluation of the measurement <br \/> 7.4.8 Test report  <\/td>\n<\/tr>\n<tr>\n<td><b>16<b><\/td>\n<td>8 Test report <br \/> 8.1 Content <br \/> 8.2 Report on pump parameters <br \/> 8.3 Report on test equipment and conditions <br \/> 8.4 Report on operational parameters  <\/td>\n<\/tr>\n<tr>\n<td><b>17<b><\/td>\n<td>Annex A (normative) Test dome  <\/td>\n<\/tr>\n<tr>\n<td><b>18<b><\/td>\n<td>Annex B (informative) Backing line and returning cooled-gas line  <\/td>\n<\/tr>\n<tr>\n<td><b>20<b><\/td>\n<td>Annex C (informative) Measuring uncertainties  <\/td>\n<\/tr>\n<tr>\n<td><b>22<b><\/td>\n<td>Bibliography  <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p><b>Vacuum technology. Standard methods for measuring vacuum pump performance &#8211; Specific parameters for mechanical booster vacuum pumps<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>2019<\/td>\n<td>24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":265237,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-265230","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/265230","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\/265237"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=265230"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=265230"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=265230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}