EN 1092-1:2001

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flangesBrides et leurs assemblages - Brides circulaires pour tubes, appareils de robinetterie, raccords et accessoires désignées PN - Partie 1: Brides en acierFlansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke und Zubehörteile, nach PN bezeichnet - Teil 1: StahlflanscheTa slovenski standard je istoveten z:EN 1092-1:2001SIST EN 1092-1:2002en23.040.60Prirobnice, oglavki in spojni elementiFlanges, couplings and jointsICS:SLOVENSKI
STANDARDSIST EN 1092-1:200201-november-2002

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1092-1December 2001ICS 23.040.60English versionFlanges and their joints - Circular flanges for pipes, valves,fittings and accessories, PN designated - Part 1: Steel flangesBrides et leurs assemblages - Brides circulaires pourtubes, appareils de robinetterie, raccords et accessoiresdésignées PN - Partie 1: Brides en acierFlansche und ihre Verbindungen - Runde Flansche fürRohre, Armaturen, Formstücke und Zubehörteile, nach PNbezeichnet - Teil 1: StahlflanscheThis European Standard was approved by CEN on 6 July 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1092-1:2001 E

ScopeThis European Standard for a single series of flanges specifies requirements for circular steelflanges in PN designations PN 2,5 to PN 100 and nominal sizes from DN 10 to DN 4000.This standard specifies the flange types and their facings, dimensions, tolerances, threading, boltsizes, flange jointing face surface finish, marking, materials, pressure/ temperature ratings andapproximate flange masses.This standard does not apply to flanges made from bar stock by turning, or to flanges of types 11,12 and 13 made from plate material.

Terms and definitionsFor the purposes of this standard the following terms and definitions apply:3.1 DNsee EN ISO 67083.2 PNsee EN 13333.3 maximum allowable pressure, PSmeans the maximum pressure for which the equipment is designed, as specified by theequipment manufacturer3.4 maximum allowable temperature, TSmeans the maximum temperature for which the equipment is designed, as specified by theequipment manufacturer4
Designation4.1GeneralTable 1 specifies the flange types and ancillary components.Figures 1 and 2 show flange types and ancillary components with the relevant flange typenumbers. Flanges shall be denoted with "flange type" and the "flange number". Ancillarycomponents shall be denoted with ancillary component type and the type number.Figure 3 shows flange facing types, which may be used with the flanges or components shown infigures 1 and 2. Flange facings shall be denoted with "type" and the relevant symbol.The range of DN, applicable to each flange type and to each PN, shall be as given in table 3.4.2Standard designationFlanges and ancillary components in accordance with this standard shall be designated with thefollowing:a) Designation, e.g. flange, lapped end or collar;b) Number of this standard, EN 1092-1;c) Number of flange type in accordance with figures 1 and 2;d) Type of flange facing in accordance with figure 3;e) DN (nominal size);f) PN designation;g) Neck thickness S (only for types 11 and 34);h) For type 13 flanges type of thread (Rp or Rc);i) Bore diameter (for sizes greater than DN 600);

General requirements5.1
Flange materialsFlanges shall be manufactured from materials given in tables 5a and 5b (see also annex D). Fortype 11, 12 and 13 flanges, the manufacture shall be from forgings. For type 21 flanges themanufacture shall be from forgings or steel castings.The flange manufacturer shall provide documentation to ensure traceability of material. Anequipment manufacturer may require a certificate in accordance with EN 10204 which is suitablefor the category of equipment to which the flange is fitted.NOTE 1
The materials given in tables 5a and 5b (see also annex D) are tabulated in groups having the same p/Tratings as given in tables 15, 16, 17,18,19 and 20 (seeannex B).NOTE 2
The materials of ancillary components are not within the scope of this standard.

RepairsWhere not otherwise prohibited by the applicable material standard, repairs by welding arepermitted when there is a proven method. All welding shall be carried out in accordance with awritten procedure.NOTE
For approval of welding procedures, see EN 288-1. For approval of welders, see EN 287-1.5.3
BoltingFlanges shall be suitable for use with the number and size of bolting as specified in tables 6 to13. The bolting shall be chosen by the equipment manufacturer according to the pressure,temperature, flange material and gasket so that the flanged joint remains tight under theexpected operating conditions. For selection of bolting, see EN 1515-1, for combination of thematerials of flanges and bolting see prEN 1515-2:1994, for information.5.4
GasketsThe various gasket types, dimensions, design characteristics and materials used are not withinthe scope of this standard. Dimensions of gaskets are given in EN 1514-1 to EN 1514-4.5.5Pressure/temperature (p/T) ratingsThe p/T ratings of flanges are given in tables 15, 16, 17,18, 19 and 20.The p/T ratings indicate the relationship between the maximum allowable pressure PS and themaximum allowable temperature.The p/T ratings shall apply only for flange types 05, 11, 12, 13 and 21 having nominal sizes up toand including DN 600. The p/T ratings of all other flanges shall be calculated or subject to specialexperience.NOTE 1
The rules for the determination of p/T ratings of the above tables are given in annexes E and F.NOTE 2
For the material groups 10E0 to 16E0 (austenitic steels) tables 17 and 18 should be used as follows:– table 17 should be chosen for application in cases where the flange deformation has to be strictly limited;– table 18 should be chosen in all cases where a small amount of plastic deformation of the flanges can beconsidered acceptable.NOTE 3
Linear interpolation is permitted for intermediate temperatures.For interpolation between (-10 °C to 50 °C) and 100 °C, 20 °C shall be used.NOTE 4
The relevant pressures and temperatures are those of the fluid in the pipework system.

The centre portion of the face of a flange type 05 need not be machined provided that the diameter of theunmachined portion does not exceed the recommended diameter for Gmax ,given in tables 6 to 13.NOTE 2
When requested by the pressure equipment manufacturer, neck thicknesses, other than those given in therelevant tables, may be supplied by agreement with the flange manufacturer.NOTE 3
A summary of the various types of flanges specified is given in table 3 showing the nominal sizes applicableto each type and to each PN.NOTE 4
Diameters N1, N2 and N3 of flange types 11, 12, 13, 21 and 34 are the theoretical maximum values permittingthe use of ring spanners or the application of normal series plain washers without any additional machining, e.g. spotfacing (see 5.8).NOTE 5
The bore diameters of flanges type 21 are not specified in this standard, the effective bore diameters areusually given in the relevant component standard(s).NOTE 6
Approximate masses of flanges are given in annex C.NOTE 7
The flange thicknesses for flanges type 05, 11, 12, 13, 21 and PN 6, PN 10, PN 16, PN 25 have an unusualstep at DN 600/DN 700. This is based on a change at some flange thicknesses up to and including DN 600 to meet thepressure/temperature ratings (limited to DN 600). The flange thicknesses for flanges DN 700 and above are the sameas they are given in the documents of origin (DIN, BS NFE, IBN etc.). They will be updated in future based on theflange calculation method as far as the corresponding work items of CEN/TC 74/WG 10 gives sufficient results.NOTE 8
For flanges type 21 dimensions A, N3 and R1 are nominal values and are included for guidance only.5.6.2HubsThe hubs of flange types 12 and 13 shall be either:a) parallel; orb) taper with an angle not exceeding 7° on the outside surface for forging or castingpurposes.Details of the weld end preparation for flanges type 11 and ancillary components type 33 shall beas given in annex A.5.6.3Threaded flanges5.6.3.1 The threads of flanges type 13 shall be parallel (symbol Rp) or tapered (symbol Rc) inaccordance with ISO 7-1. Gauging shall be in accordance with ISO 7-2.NOTE
Parallel threads will be supplied unless otherwise requested by
the equipment manufacturer.
It is not intended that instrument measurements be taken on the faces themselves; the Ra and Rz values asdefined in EN ISO 4287 relate to the reference specimens.5.7.2.2 For flanges with facing types A, B1, E and F, turning shall be carried out with a roundnosed tool in accordance with table 2.5.7.2.3 Flanges
PN 40 shall have type B1 facings and flanges
PN 63 shall have type B2facings, unless otherwise agreed in the order.

XXX/EN 1092-1/11/DN 150/PN 40/S235JR/12345If a flange is too small to enable all the markings required then the minimum marking requiredshall be:a) Flange manufacturer’s name or trade mark;b) letters “EN”;e) PN designation e.g. PN 40;g) either the symbol or the number or the grade of the material;h) cast number or melt identification or suitable control number.

It should be ensured that steel stamp markings are not liable to cause cracks in the flange material.5.10.3Declaration of complianceThe marking EN 1092-1, together with the flange manufacturer's name or trademark on or inrelation to a product, represents the flange manufacturer's declaration of compliance to thisstandard, i.e. a claim by or on behalf of the flange manufacturer that the product meets therequirements of this standard.

These sketches are diagrammatic only, in particular no detail is shown for the mating surfaces (see figure 3).Figure 1 - Flange typesType 01Plate flange for weldingType 02Loose plate flange with weld-on collar (seetype 32) or lapped pipe end (see type 33)Type 04Loose plate flange with weld-neck collar(see type 34)Type 05Blank flangeType 11Weld-neck flangeType 12Hubbed slip-on flange for weldingType 13Hubbed threaded flangeType 21Integral flange

Type numbers have been made non-consecutive to permit possible future additions.Type 32Type 33Type 34Weld-on collar plateLapped pipe endWeld-neck collarNOTE
These sketches are diagrammatic only.Figure 2 - Ancillary components Types 32 to 34

The transition from the edge of the raised face to the flange face may be by radius or chamfer for types B, D,F and G only (see 5.7.1).NOTE 2
B1 and B2 are raised face (type B) for different applications (see 5.7.2.2, 5.7.2.3 and table 2).NOTE 3
For the dimensions of flange facings, see figure 4 and table 4.Figure 3 - Flange facing types

For certain applications, e.g. low temperature gases, it may be necessary to stipulate closer control to thesurface finish.

Dimension C includes the raised face thickness.NOTE 2
Cross section diameter of the O-ring is 2
R.Figure 4 - Flange facing (dimensions see table 4)

Dimension N1 is measured at the intersection of the hub draft angle and the back face of the flange.NOTE 2
For dimension G max’ refer to NOTE 1 of 5.6.1.Figure 5 - Dimensions of PN 2,5 flangesType 01Type 05Type 11

Dimensions N1, N2 and N3 are measured at the intersection of the hub draft angle and the back face of the flange.NOTE 2
For dimension d1, see table 4.NOTE 3
For dimensions G max refer to NOTE 1: of 5.6.1.NOTE 4
Type 33; lapped pipe end without determination of thickness.Figure 6 - Dimensions of PN 6 flanges

Dimensions N1, N2, and N3 are measured at the intersection of the hub draft angle and the back face of the flange.NOTE 2
For dimensions d1 see table 4.NOTE 3
For dimensions G max’ refer to NOTE 1 of 5.6.1.NOTE 4
Type 33; lapped pipe end without determination of thickness.Figure 7 - Dimensions of PN 10 flangesType 11Type 05Type 12Type 13Type 21Type 01Type 02 and 32Type 02 and 33Type 04 and 34This diagram illustrates thearrangement but notnecessarily the correctnumber of bolt holes.Refer to the column "BoltingNumber" in table 8 for theactual number.

50 to150Use PN 16 dimensions200340295228M20219,1221,522624024242424620190446216234246246106,32503953502212M20273,0276,528129426262626822235466816292298298126,33004454002212M20323,9327,533334826262626822285466816342350348127,13505054602216M20335,6359,536540028262626822330536816385400408127,14005655152616M24406,4411,041645032262626824380577216440456456127,14506155652620M24457,0462,046749836282828824425637216488502502127,15006706202620M24508,0513,551955038282828826475677516542559559127,16007807253020M27610,0616,562265042283434826575758018642658658127,17008958403024M27711,0----303438--670-8018746-772128,080010159503324M30813,0----323642--770-9018850-87612
8,0900111510503328M30914,0----343846--860-9520950-9761210,01000123011603628M331016,0----343852--960-95201052-10801610,01200145513803932M361219,0----384460--1160-115251256-12921611,01400167515904236M391422,0----4248-----120251460-14961612,01600191518204840M451626,0----4652-----130251666-17121614,01800211520204844M451829,0----5056-----140301868-19101615,02000232522304848M452032,0----5460-----150302072-21201616,02200255024405652M522235,0----58------160352275--1818,02400276026505656M522438,0----62------170352478--1820,02600296028505660M522620,0----66------180402680--1822,02800318030705664M522820,0----70------190402882--1822,03000340532906268M563020,0----75------200453085--1824,0a For flanges type 21 the outside hub diameter approximately corresponds to the outside pipe diameter.

Dimensions N1, N2, and N3 are measured at the intersection of the hub draft angle and the back face of the flange.NOTE 2
For dimensions d1 see table 4.NOTE 3
For dimensions G max’ refer to NOTE 1 of 5.6.1.NOTE 4
Type 33; lapped pipe end without determination of thickness.Figure 8 - Dimensions of PN 16 flangesType 11Type 05Type 12Type 13Type 21Type 01Type 02 and 32Type 02 and 33Type 04 and 34This diagram illustrates thearrangement but notnecessarily the correctnumber of bolt holes.Refer to the column "BoltingNumber" in table 9 for theactual number.

13, 211101020401112105023205121111111221111121a12021204341334343413123434320413132110toUse PN 40 dimensions4050165125184M1660,361,5657719181818516-2845874848452,96518514518
8 bM1676,177,5819620181818616553245109210410462,980200160188M1688,990,594108202020206167034501010511812063,2100220180188M16114,3116,0120134222020206189040521213114014083,6125250210188M16139,7141,51451622222222261811544551215616817084,0150285240228M20168,3170,517418824222222620140445512184195190104,52003402952212M20219,1221,522624026242424620190446216235246246106,32504053552612M24273,0276,528129429262626822235467016292298296126,33004604102612M24323,9327,533334832282828824285467816344350350127,13505204702616M24355,6359,036540035303030826330578216390400410128,04005805253016M27406,4411,041645438323232828380638516445456458128,04506405853020M27457,0462,046750042404040830425688716490502516128,05007156503320M30508,0513,551055646444444832475739016548559576128,06008407703620M33610,0616,562266052545454832575839518652658690128,87009108403624M33711,0----364248--6708310018755760760128,880010259503924M36813,0----384252--77090105208558648621210,0900112510503928M36914,0----404458--86094110209559689621210,01000125511704228M391016,0----424664--960100120221058107210761610,01200148513904832M451219,0----485276--1160-130301262-12821612,51400168515904836M451422,0----5258---1346-145301465-14821614,21600193018205640M521626,0----5864---1546-160351668-16961616,01800213020205644M521829,0----6268---1746-170351870-18961617,52000234522306248M562032,0----6670---1950-180402072-21001620,0a For flanges type 21 the outside hub diameter approximately corresponds to the outside pipe diameter.b According to EN 1092-2(Cast iron flanges) and prEN 1092-3 (Copper alloy flanges), the flanges in this DN and PN may be supplied with 4 holes. Where steel flanges are required with 4 holes, these may be supplied by agreement between manufacturer and purchaser.

Dimensions N1, N2, and N3 are measured at the intersection of the hub draft angle and the back face of the flange.NOTE 2
For dimensions d1 see table 4.NOTE 3
For dimensions G max’ refer to NOTE 1 of 5.6.1.NOTE 4
Type 33; lapped pipe end without determination of thickness.Figure 9 - Dimensions of PN 25 flangesType 11Type 05Type 12Type 13Type 21Type 01Type 02 and 32Type 02 and 33Type 04 and 34This diagram illustrates thearrangement but notnecessarily the correctnumber of bolt holes.Refer to the column "BoltingNumber" in table 10 for theactual number.
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