平 焊 法 兰 尺 寸 一 览 表 （GD87） 类别公称压力公称通径外径Do内径D孔中心距D1凸面直径D2厚度b孔径d孔数n螺栓长（mm）Pn0.25Pn0.6Pn1.0Pn1.6Pn2.5Pn0.25-2.5Pn0.25Pn0.6Pn1.0Pn1.6Pn2.5Pn0.25Pn0.6Pn1.0Pn1.6Pn2.5Pn0.25Pn0.6Pn1.0Pn1.6Pn2.5Pn0.25Pn0.6Pn1.0Pn1.6Pn2.5Pn0.25Pn0.6Pn1.0Pn1.6Pn2.5Pn0.25Pn0.6Pn1.0Pn1.6Pn2.5107575909090155050606060323240404012121414141111141414444444040454545158080959595195555656565404045454512121414141111141414444444040454545209090105105105266565757575505055555514141616161111141414444444040505050251001001151151153375758585856060656565141416161611111414144444440405050503212012014014014039909010010010070707878781616181818141418181844444505060606040130130150150150461001001101101108080858585161618181814141818184444450506060605014014016516516558110110125125125909010010010016162020201414181818444445050606060701601601851851857713013014514514511011012012012016162020221414181818444485050606065801901902002002009015015016016016012512513513513518182020241818181818448886060606070100210210230230230109170170180180190145145155155160181822222618181818224488860606565751252402402502502701342002002102102201751751851851882020222228181818182688888606065658515026526528528530016022522524024025020020021021021822222424301818222226888886565656585175295295315315330195255255270270280230230240240248222224263218182222268888126565757590200320320340340360221280280295295310255255265265278222224263218182222268881212656575759022534534537037039524730530532532534028028029529530224242429341818222230888121270707580100250375375395405425275335335350355370310310320320335242426293518182226301212121212707080851003004404404454604853273953954004104303623623683753902424283238222222263012121212167575859011035049049050552055537944544546047049041241242843544826263035422222222633121216161680809010012040054054056558062042949549551552555046246248248550528283238462222263036161616161685851001101304505955956156406704815505505655856005185185325455553030354250222226303616162020209090100120140500645645670715730532600600620650660568568585608610323238465622222633392020202020100100110130150600755755780840845634705705725770770670670685718718343442526826263036422020222020100100120140180700860860895724810810840775775800363642262630242424110110120 8009759751015824920920950880880905383842303033242424110110130 编制：汽机工程处SXZ