{"id":212820,"date":"2024-10-19T13:46:39","date_gmt":"2024-10-19T13:46:39","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-24561990\/"},"modified":"2024-10-25T06:39:00","modified_gmt":"2024-10-25T06:39:00","slug":"bs-24561990","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-24561990\/","title":{"rendered":"BS 2456:1990"},"content":{"rendered":"<p>This British Standard specifies requirements for two grades of float, with or without boss inserts. Grade C for use in cold water cisterns only, where they may be exposed to temperatures not exceeding 38 \u00b0C. Grade H for use in cold water cisterns or systems that may subject the float to hot water not exceeding 93 \u00b0C for a limited period, e.g. from a vent pipe arrangement in a feed and expansion cistern. The standard specifies plastics spherical floats of 102 mm, 114 mm, 127 mm and 152 mm diameter, and non-spherical floats having equivalent lifting efforts, suitable for attachment to the float operated valves specified in BS 1212-1, BS 1212-2 and BS 1212-3, except when otherwise specified by the purchaser in accordance with Appendix A of this standard.<\/p>\n<p>Appendix A lists the information to be provided by the purchaser at the time of enquiry or order.<\/p>\n<blockquote>\n<p>NOTE The titles of the publications referred to in this standard are listed on the inside back cover.<\/p>\n<\/blockquote>\n<p>Requirements for two grades of plastic floats specified in BS 1212.<\/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>1<b><\/td>\n<td>BRITISH STANDARD  <\/td>\n<\/tr>\n<tr>\n<td><b>2<b><\/td>\n<td>Committees responsible for this British\ufffdStandard  <\/td>\n<\/tr>\n<tr>\n<td><b>3<b><\/td>\n<td>Contents  <\/td>\n<\/tr>\n<tr>\n<td><b>5<b><\/td>\n<td>Section 1. General <br \/> 1.1 Scope <br \/> 1.2 Definitions <br \/> 1.2.1 diameter of spherical float <br \/> 1.2.2 lifting effort <br \/> 1.3 Marking <br \/> 1.4 Colour coding  <\/td>\n<\/tr>\n<tr>\n<td><b>7<b><\/td>\n<td>Section 2. Materials <br \/> 2.1 Effect of materials on water quality <br \/> 2.1.1 General <br \/> 2.1.2 Non-metallic materials <br \/> 2.2 Plastics materials <br \/> 2.3 Copper alloy for boss insert  <\/td>\n<\/tr>\n<tr>\n<td><b>9<b><\/td>\n<td>Section 3. Design and construction <br \/> 3.1 Lifting efforts <br \/> Table 1 &#8211; Minimum lifting efforts <br \/> 3.2 Bosses <br \/> 3.2.1 General <br \/> 3.2.2 Boss face <br \/> 3.2.3 Axis <br \/> Table 2 &#8211; Bosses  <\/td>\n<\/tr>\n<tr>\n<td><b>11<b><\/td>\n<td>Section 4. Test requirements <br \/> 4.1 Leakage and hot water test <br \/> 4.2 Deflection test <br \/> 4.3 Impact test <br \/> 4.4 Cold embrittlement test <br \/> 4.5 Boss distortion test  <\/td>\n<\/tr>\n<tr>\n<td><b>13<b><\/td>\n<td>Appendix A  <br \/> Information to be supplied by the purchaser <br \/> Appendix B <br \/> Calculation of lifting effort <br \/> Appendix C <br \/> Method of test for leakage and determination of resistance to hot water <br \/> C.1 Apparatus <br \/> C.2 Procedure  <\/td>\n<\/tr>\n<tr>\n<td><b>14<b><\/td>\n<td>Appendix D <br \/> Method of determining deflection <br \/> D.1 Principle <br \/> D.2 Apparatus <br \/> D.3 Procedure  <\/td>\n<\/tr>\n<tr>\n<td><b>15<b><\/td>\n<td>Appendix E  <br \/> Method of determining resistance to cold embrittlement <br \/> E.1 Principle <br \/> E.2 Apparatus  <\/td>\n<\/tr>\n<tr>\n<td><b>16<b><\/td>\n<td>E.2 Procedure <br \/> E.4 Result <br \/> Appendix F <br \/> Method of determining resistance of the boss to distortion <br \/> F.1 Principle <br \/> F.2 Apparatus <br \/> F.3 Procedure <br \/> F.4 Result  <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p><b>Specification for floats (plastics) for float operated valves for cold water services<\/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>2001<\/td>\n<td>18<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":212823,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1277,2641],"product_tag":[],"class_list":{"0":"post-212820","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-91-140-60","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\/212820","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\/212823"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=212820"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=212820"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=212820"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}