{"id":486270,"date":"2024-11-05T12:13:13","date_gmt":"2024-11-05T12:13:13","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/agma-9000-d11\/"},"modified":"2024-11-05T12:13:13","modified_gmt":"2024-11-05T12:13:13","slug":"agma-9000-d11","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/agma\/agma-9000-d11\/","title":{"rendered":"AGMA 9000-D11"},"content":{"rendered":"<p>\n<u><strong>SCOPE<\/strong><\/u><\/p>\n<p>\tThis standard defines classes of flexible coupling potential unbalance, one of which the user must select in order to meet the needs of their system.\u00a0 The classes are established using weight and speed and system sensitivity to arrive at a mass displacement value that defines the potential unbalance.\u00a0 The standard defines types of unbalance, provides a method of selecting balance class, identifies contributors to potential unbalance, and provides a method of determining potential coupling unbalance.\u00a0 The balance classes are derived from consideration of the potential unbalance of the coupling.<\/p>\n<p>\tThe balancing requirements for a flexible coupling depend upon the rotating system into which it is mounted.\u00a0 Each half of the coupling is mounted on a separate rotor with the whole coupling providing the connection.\u00a0 Each of the connected rotors is balanced independently of the coupling and the coupling is added when the rotors are installed.\u00a0<\/p>\n<p>\tThis standard is used with ANSI S2.19-1999 or ISO 1940-1:2003 which apply to balance quality requirements of rigid rotors.\u00a0 If ANSI S2.19-1999 or ISO 1940-1:2003 is used for balancing coupling components and assemblies in the balancing machine, then potential unbalances are introduced after the coupling is disassembled and reassembled either in the balancing machine or the rotor system.\u00a0 These potential unbalances are primarily the result of:<\/p>\n<ul>\n<li>\n<p>\t\tbalancing mounting fixture inaccuracies;<\/li>\n<li>\n<p>\t\tdisplacement of coupling components with respect to the axis of rotation of the rotor system during disassembly and reassembly of the coupling.<\/li>\n<\/ul>\n<p>\n<strong>Application<\/strong><\/p>\n<p>\tThis standard is applicable to couplings and addresses potential unbalance which could be expected of a coupling in service.\u00a0 This standard accounts for issues of runout and clearances in the calculation of potential unbalance and resulting balance class.\u00a0 It should be noted that a flexible coupling is generally an assembly of several components having diametral clearance and eccentricities between the pilot surfaces.\u00a0 ANSI S2.19-1999 (ISO 1940-1:2003) addresses residual unbalance as measured in the balancing machine.\u00a0 For an example, see annex K.<\/p>\n<p>\n<strong>Exclusions<\/strong><\/p>\n<p>\tThis standard does not take into account arbitrary balance standards developed by other standards organizations (e.g., American Petroleum Institute).\u00a0 In addition, this standard does not address the unbalance effects caused by:<\/p>\n<ul>\n<li>\n<p>\t\tshaft runout;<\/li>\n<li>\n<p>\t\tkeys that protrude beyond the hub or shaft;<\/li>\n<li>\n<p>\t\tunfilled keyways or keyseats;<\/li>\n<li>\n<p>\t\tcoupling mounting surface clearance;<\/li>\n<li>\n<p>\t\tnon-homogeneous materials;<\/li>\n<li>\n<p>\t\tcurved datum.<\/li>\n<\/ul>\n<p>\n<strong>Additional considerations<\/strong><\/p>\n<p>\tBalancing a coupling does not assure one of great gains in balance.\u00a0 The greatest gains in balance come during the manufacturing of the coupling.\u00a0 Controlled runouts of pilots and pilot fit clearances, provided by the coupling supplier during manufacturing, give the greatest results.\u00a0 Balancing of various components results in minimal gain over controlling the bore runout during re-boring.\u00a0 It should be noted that two perfectly balanced parts mounted eccentrically would still shake.\u00a0 An assembly balanced coupling, re-assembled to runouts different than those when in the balance machine, will still be out of balance (the difference between residual and potential unbalance).<\/p>\n<p>\tCalculations of system unbalance cannot be used to determine system vibrations as stated in the introduction to ISO 1940-1:1986 [1] and ANSI S2.19-1999, which reads:<\/p>\n<p>\t&#034;It is not readily possible to draw conclusions as to the permissible residual unbalances from any existing recommendations on the assessment of the vibratory state of machinery, since there is often no easily recognizable relation between the rotor unbalance and the machine vibrations under operating conditions.\u00a0 The amplitude of the once-per-revolution vibrations is influenced by characteristics of the rotor, of the machine, of the structure and of the foundation, and by the proximity of the service speed to the various resonance frequencies, etc.\u00a0 Moreover, the machine vibrations may be due only in part to the presence of rotor unbalance.\u201d<\/p>\n<p>\n<u><strong>FOREWORD<\/strong><\/u><\/p>\n<p>\t[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of ANSI\/AGMA Standard 9000-D11, <em>Flexible Couplings &#8211; Potential Unbalance Classification<\/em>.<\/p>\n<p>\tThis standard was developed after intensive study of existing standards, literature, design practices, and manufacturing procedures for the balancing of flexible couplings.\u00a0 The intent of this document is to offer designers, manufacturers and users standard criteria for the unbalance classification of flexible couplings.<\/p>\n<p>\tThe information contained within this standard does not necessarily agree with some existing specifications for other rotating components and equipment.\u00a0 This standard is based upon the design criteria, related to the balancing of couplings, that have evolved over many years of successful industry practice.<\/p>\n<p>\tAt first, the coupling industry informally adopted, by usage, one tenth ounce-inch as a standard of unbalance tolerance.\u00a0 It soon became evident that for larger couplings this was an impractical tolerance.\u00a0 It also became evident that the runout of the balancing arbor as well as its own unbalance were very important factors in the final potential unbalance remaining in the corrected coupling.\u00a0 These facts were pointed out in Paper AGMA 519.01, October, 1967, the first AGMA technical paper written on the subject of flexible couplings.\u00a0 Shortly after the publication of this paper, Product Group 5 asked the Technical Committee to write an AGMA balancing standard for flexible couplings.\u00a0 It was recognized that existing balancing specifications such as MIL-STD 167 (ships) and ISO 1940 did not address flexible couplings.<\/p>\n<p>\tAGMA 515.01 was intended as a guide to coupling users.\u00a0 The first rough draft of this standard was made in October of 1968.\u00a0 The first committee draft was prepared in February of 1972.\u00a0 It was approved by the membership on July 9, 1973.<\/p>\n<p>\tAGMA 515.02 was a revision of AGMA 515.01.\u00a0 It was reviewed by the members of the Flexible Couplings Product Group 5 in January, 1974 and was revised in January, 1975 and again in September, 1975.\u00a0 It was approved by the membership on August 18, 1976.<\/p>\n<p>\tANSI\/AGMA 9000-C90 was a revision and redesignation of AGMA 515.02.\u00a0 In the revision there were changes and corrections in the method of calculating the total potential unbalance of couplings\u00a0 (including the effects of hardware and eccentricity).\u00a0 The calculations gave a more accurate value of the potential unbalance of a coupling.\u00a0 The examples in the appendices were revised to show a generic coupling which illustrates the calculation methods presented.\u00a0 It was approved by the AGMA membership in November 1989, and was adopted as a National Standard on February 28, 1990.<\/p>\n<p>\tANSI\/AGMA 9000-D11 is a revision of ANSI\/AGMA 9000-C90.\u00a0 This revision introduces the use of ANSI S2-1999 or ISO 1940-1:2003 for the specification of balance quality grades for components or assemblies and how to properly apply that information to flexible coupling potential unbalance.\u00a0 It also contains numerous annexes for generic general purpose and high performance couplings.\u00a0 These annexes show how to apply the calculation methods of this standard for both component and assembly balancing of flexible couplings.\u00a0 Each annex also contains a discussion section and a section on the &#034;value of the balance grade\u201d which explains why a better balance grade may not result in a better balanced coupling assembly.<\/p>\n<p>\tThe first draft of ANSI\/AGMA 9000-D11 was made in October, 2005.\u00a0 It was approved by the AGMA membership in April, 2011.\u00a0 It was approved as an American National Standard on August 10, 2011.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Flexible Couplings &#8211; Potential Unbalance Classification<\/b><\/p>\n<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\/agma\/\"><b>AGMA<\/b><\/a><\/td>\n<td>2011<\/td>\n<td>69<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":486276,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2659],"product_tag":[],"class_list":{"0":"post-486270","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-agma","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\/486270","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\/486276"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=486270"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=486270"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=486270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}