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    Head Office (Darwin)

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    Brisbane / PNG

    Size dn20

    AUSTRALIAN

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    SIZE DN20

    FLANGE DIMENSIONS TABLE SIZE (DN) 20 (3/4″)

    Class/Table Flange O.D. PCD Bolts Bolt Size Hole Size Minimum Flange Thickness*
    Cast Iron Ductile Iron Copper Alloy Steel
    ASME Class 125 B16.1 3 7/8″ / 98mm 2 3/4″ / 70mm 4 1/2″ 5/8″ / 16mm 11/32″ / 9mm 9/16″ / 14mm
    ASME Class 150 B16.5 3 7/8″ / 98mm 2 3/4″ / 70mm 4 1/2″ 5/8″ / 16mm 11/32″ / 9mm 9/16″ / 14mm
    ASME Class 300 B16.5 4 5/8″ / 117mm 3 1/4″ / 83mm 4 5/8″ 3/4″ / 19mm 17/32″ / 13mm 5/8″ / 16mm
    ASME Class 600 B16.5 4 5/8″ / 117mm 3 1/4″ / 83mm 4 5/8″ 3/4″ / 19mm 5/8″ / 16mm
    ASME Class 900 B16.5 5 1/8″ / 130mm 3 1/2″ / 89mm 4 3/4″ 7/8″ / 22mm 1″ / 25mm
    ASME Class 1500 B16.5 5 1/8″ / 130mm 3 1/2″ / 89mm 4 3/4″ 7/8″ / 22mm 1″ / 25mm
    ASME Class 2500 B16.5 5 1/2″ / 140mm 3 3/4″ / 95mm 4 3/4″ 7/8″ / 22mm 1 1/4″ / 32mm
    ISO7005-1/AS4331.1 ⑤ PN20 (ANSI 150) 100mm 70mm 4 M14 16mm 13mm
    ISO7005-1/AS4331.1 ⑤ PN50 (ANSI 300) 120mm 82mm 4 M16 18mm 16mm
    ISO7005-1/AS4331.1 ⑤ PN110 (ANSI 600) 120mm 82mm 4 M16 18mm 16mm
    ISO7005-1/AS4331.1 ⑤ PN150 (ANSI 900) 130mm 89mm 4 M20 22mm 25mm
    ISO7005-1/AS4331.1 ⑤ PN260 (ANSI 1500) 130mm 89mm 4 M20 22mm 25mm
    ISO7005-1/AS4331.1 ⑤ PN420 (ANSI 2500) 140mm 95mm 4 M20 22mm 32mm
    AS2129① Table C 100mm 73mm 4 13mm 14mm 13mm 13mm 10mm
    AS2129① Table D 100mm 73mm 4 13mm 14mm 13mm 13mm 6mm 10mm
    AS2129① Table E 100mm 73mm 4 13mm 14mm 13mm 13mm 6mm 10mm
    AS2129① Table F 100mm 73mm 4 13mm 14mm 13mm 13mm 8mm 10mm
    AS2129① Table H 115mm 83mm 4 16mm 18mm 16mm 10mm 13mm
    AS2129① Table J 115mm 83mm 4 16mm 18mm 16mm 16mm
    AS4087① PN14 100mm 73mm 4 M12 14mm 6mm
    AS4087① PN16
    AS4087① PN21
    AS4087① PN35
    BS10 Table D 4″/ 102mm 2 7/8″ / 73mm 4 1/2″ 9/16″ / 14mm 1/2″ / 13mm 1/4″ / 6mm 3/8″ / 10mm
    BS10 Table E 4″ / 102mm 2 7/8″ / 73mm 4 1/2″ 9/16″ / 14mm 1/2″ / 13mm 1/4″ / 6mm 3/8″ / 10mm
    BS10 Table F 4″ / 102mm 2 7/8″ / 73mm 4 1/2″ 9/16″ / 14mm 1/2″ / 13mm 5/16″ / 8mm 3/8″ / 10mm
    BS10 Table H 4 1/2″ / 114mm 3 1/4″ / 83mm 4 5/8″ 11/16″ / 17mm 5/8″ / 16mm 3/8″ / 10mm 1/2″ / 13mm
    BS10 Table J 4 1/2″ / 114mm 3 1/4″ / 83mm 4 5/8″ 11/16″ / 17mm 5/8″ / 16mm 5/8″ / 16mm
    BS10 Table K 4 1/2″ / 114mm 3 1/4″ / 83mm 4 5/8″ 11/16″ / 17mm 3/4″ / 19mm 3/4″ / 19mm
    ISO7005-1/2AS4331.1⑤ PN6 90mm 65mm 4 M10 11mm 14mm 14mm
    ISO7005-1/2AS4331.1⑤ PN10 105mm 75mm 4 M12 14mm 16mm 16mm 18mm
    ISO7005-1/2AS4331.1⑤ PN16 105mm 75mm 4 M12 14mm 16mm 16mm 18mm
    ISO7005-1/2AS4331.1⑤ PN25 105mm 75mm 4 M12 14mm 18mm 16mm 18mm
    ISO7005-1/2AS4331.1⑤PN40 105mm 75mm 4 M12 14mm 18mm
    BS4504② PN6 90mm 65mm 4 M10 11mm 14mm
    BS4504② PN10 105mm 75mm 4 M12 14mm 16mm
    BS4504② PN16 105mm 75mm 4 M12 14mm 16mm 6mm 18mm
    BS4504② PN25 105mm 75mm 4 M12 14mm 18mm 8mm 18mm
    BS4504② PN40 105mm 75mm 4 M12 14mm 9mm 18mm
    BS4504② PN64 130mm 90mm 4 M16 18mm 22mm
    BS4504② PN100 130mm 90mm 4 M16 18mm 22mm
    EN1092-1/2/3③ PN6 90mm 65mm 4 M10 11mm 14mm 14mm
    EN1092-1/2/3③ PN10 105mm 75mm 4 M12 14mm 16mm 16mm 18mm
    EN1092-1/2/3③ PN16 105mm 75mm 4 M12 14mm 16mm 16mm 18mm
    EN1092-1/2/3③ PN25 105mm 75mm 4 M12 14mm 18mm 16mm 18mm
    EN1092-1/2/3③ PN40 105mm 75mm 4 M12 14mm 18mm
    EN1092-1/2/3③ PN63 130mm 90mm 4 M16 18mm 22mm
    EN1092-1/2/3③ PN100 130mm 90mm 4 M16 18mm 22mm

    AS2129 still in use but now only covers Table D to H. Table C now obsolete, Table J to T now replaced by AS4331.1 which is a replication of ISO7500-1 which in turn is equivalent to ASME 150-2500 class ANSI B16.5. AS4331.1 and ISO 7005-1 also incorporates previous DIN PN rated flanging. AS4087 is the new standard covering Table D to H. The same drilling is specified but the PN rating system is used (PN14 to PN35) and in some cases flange thickness varies slightly. AS4087 PN14 & PN16 are the same drilling as AS2129 Table D. AS4087 PN21 is the same drilling and rating as AS2129 Table F. AS4087. AS4087 PN14 & PN16 is the same drilling as AS2129 Table D. AS4087 PN21 is the same rating and drilling as AS2129 Table F and PN35 is the same drilling as Table H. AS4087 specifies raised face in Ductile Iron PN16 & PN35 and flat face in Grey Cast Iron PN14, PN21, PN35. Click here to view full AS4087 flanging dimensions.

    ② British metric standard BS4504 is now obsolete and replaced by EN1092-1 edition 09-2008 for steel flanges which also incorporates DIN2501 standard. EN1092-1 is also published in the British standards as BS-EN1092-1. Flange drillings in EN1092-1 are generally the same as BS4504 but EN1092-1 covers a wider range.

    EN1092-1 is for steel flanges, EN1092-2 is for Iron flanges, EN1092-3 is for Copper Alloy flanges, EN1092-4 is for Aluminium flanges. Regarding EN1092-2 Iron flanges, these figures are for integral flanges on valves, etc. Cast (Grey) Iron thicknesses are shown in Cast Iron column. EN1092-2 specifies a thinner flange thickness for Ductile Iron in larger sizes which is shown in the Ductile Iron column. For full EN1092-1 table Click here EN1092-1 is for steel flanges.

    Refer EN1092-3 copper alloy, EN1092-4 aluminium alloy.

    ISO7005-1 & ISO 7005-2 (which AS4331.1 mirrors) replaces DIN 2501 & DIN 2533 and BS4504 PN6 to 40. ISO7005-1 & 7005-2 PN6 to 40 is the same as EN1092-1 (note some flanges thicknesses vary slightly) but also incorporates ANSI flanging redesignated as PN20, PN50, PN110, PN150, PN260, PN420. ISO7005-1/AS4331.1 is steel flanges, ISO7005-2/AS4331.2 is iron flanges, ISO7005-3/AS4331.3 is copper alloy flanges. AS4331.1 is a reproduction of ISO7005-1, AS4331.2 is a reproduction of ISO7005-2, AS4331.3 is a reproduction of ISO7005-3.

    * Varies according to flange type (thickness includes raised face height where applicable) refer to standard

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