ASTM E2734/E2734M-10 (2018) pdf free

04-12-2021 comment

ASTM E2734/E2734M-10 (2018) pdf free.Standard Specification for Dimensions of Knife-Edge Flanges.
This standard specifies the dimensions of knife-edgestyle flanges and their associated gaskets used in vacuumsystems for pressures ranging from 105 Pa to 10″ Pa.Suchflanges are widely used throughout vacuum technology applications in semiconductor processing tools,surface analysissystems,space simulation systems,and general research requiring vacuum.
The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents; therefore,eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.This standard does not purport to address all of thesafety concerns,if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendaiions issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.For definitions used in this specification,see Terminology E673.
Definitions of Terms Specific to This Standard:knife-edge flange, n—vacuum flanges seal with ametal gasket;two mating surfaces with identical circular(triangular profile) knife-edges are bolted together; a deform-able metal gasket, captured between the knife-edges provides aleak-free seal.
Discussion-Vacuum flanges that seal with a metalgasket were originally developed as Conflat flanges (trade-mark) by the Varian Corporation.type, n—knifeedge flanges come in a variety of sizes;historically, the flange sizes were identified in North Americaas the flange’s outside diameter (in inches) and in Europe as themaximum nominal bore of the tube (in millimetres) that mightbe welded to the flange; for this specification,the flangeidentification “type”is used where the type is approximatelyequal to the flange’s outside diameter in inches.
Flanges must be manufactured from a sufficiently hard or hard-coated material to resist deformation of theknife-edge profile despite repeatedly forming a vacuum sealwith metal gaskets.Gasket must be manufactured from a soft,annealed,or partially-tempered metal such that the matingflanges’knifeedges cause sufficient (initial) plastic deforma-tion that a vacuum seal is accomplished.ASTM E2734 pdf download.

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