ISO 27509 INTERNATIONAL STANDARD edition Second2020-12 Petroleum and natural gas industries Compact flanged connections with IX seal ring Industries du pétrole et dugaz naturel-Raccordements a brides compactes avec bague d'etancheite IX ISORefesegceonobey [so @ISO2020 IS027509:2020(E) COPYRIGHTPROTECTEDDOCUMENT @IS0 2020 Ad rigbitsduserverlutihilkesotherwise sipeacifjefhrororrdyuaingydimehescoleektoufioitsrieaplamenitatiominplrdiofgpisotocopying,pnbljcationposting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or Iso's member body in the country of the requester. fSotobyFigntficBlandonnet8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 WeBlite:copyrightfso.org Published in Switzerland i @ISo2020-All rights reserved IS027509:2020(E) Contents Page Foreword Iptroduction. vii Scope 1 2 Normative references 1 3 Terms and definitions 2 4 Abbreviations and symbols 2 4.1 Abbreviated terms 2 4.2 Symbols 3 5 Design 5 5.1 General. 5 5.2 Design principles 6 5:3 Saeaably cepuements 8 5.5 Units of measurements .9 5.6 Rounding 9 i 6 Designation .10 6.1 Designation of flanges. 10 6.2 Designation of seal rings 10 7 Materials. 11 7.1 General. 11 7.2 Flange materials. 11 8 Strength,pressure/temperature ratings and leak tightness 13 8.1 General. 13 8.2 Pressure/temperature ratings 13 9 Dimensions of flanges 14 9.1 General. .14 9.2 Weld neck dimensions. 15 9.3 Bltegralflange (BLJldimensions 23 9.5 Rigid interface dimensions .37 9.6 Dimensions of paddle blanks (PB) and paddle spacers (PS) ..39 Bandlsfund oflifineclugsspacers (os) 41 9.9 Dimensionsofreducingthreadedflanges 44 9.10 Auxiliary connections... 45 10 Marking of flanges 48 10.1 Flanges other than integral flanges 48 10.2 Manufacturer'snameortrademark 48 10.3 Nrassnae sisslesignation 48 10.5 Pipe dimensions. .48 10.6 Material identification 48 @IS0 2020-All rights reserved iii