1、BSI Standards PublicationBS EN ISO 27509:2012Petroleum and natural gas industries Compact flanged connections with IX seal ringBS EN ISO 27509:2012Incorporating corrigendum August 2013BS EN ISO 27509:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 27509
2、:2012. It is identical to ISO 27509:2012, incorporating corrigendum August 2013.The start and finish of text introduced or altered by corrigendum is indicated in the text by tags. Text altered by ISO corrigendum August 2013 is indicated in the text by .The UK participation in its preparation was ent
3、rusted to Technical Committee EPL/501, Electronic assembly technology seal ring dimensions and material requirements; bolting dimensions and material requirements; requirements to tolerances and surface finish; requirements to designation and marking of finished products. Normative annexes A and D c
4、over the following topics: structural capacity equations for flange assemblies; bolt dimensions and masses. Informative annexes B, C, E, F and G cover the following topics: how to apply the flanges to special geometries of valves and equipment nozzles; quality management; installation and assembly i
5、nstructions, and guidelines on how to repair damage and irregularities on sealing surfaces; masses of all standard components; suitable dimensions of alternative metric bolting. BS EN ISO 27509:2012ISO 27509:2012(E) ISO 2012 All rights reserved viiFor the purposes of this International Standard, the
6、 following verbal forms apply: “shall“ indicates a requirement strictly to be followed in order to conform to this International Standard and from which no deviation is permitted, unless accepted by all involved parties; “should“ indicates that among several possibilities one is recommended as parti
7、cularly suitable, without mentioning or excluding others, or that a certain course of action is preferred but not necessarily required; “may“ indicates a course of action permissible within the limits of this International Standard; “can“ is used for statements of possibility and capability, whether
8、 material, physical or casual. BS EN ISO 27509:2012ISO 27509:2012(E) vi ISO 2012 All rights reservedIntroduction This International Standard, which is based on NORSOK L-00536, has been developed to provide a standard for compact flanged connections (CFCs) that constitutes an alternative to conventio
9、nal flanges as specified in ASME standards, European Standards and other International Standards, with reduced mass and smaller overall dimensions, as well as increased reliability in leak tightness by means of its inherent design features and make up procedures. CFCs can also provide an alternative
10、 to other types of clamp and hub type mechanical connectors. The use of load carrying sealing elements, traditionally referred to as “gaskets“, does not comply with the fundamental requirements of this International Standard. This International Standard has been developed for use in process piping s
11、ystems, which are designed according to codes for pressure piping, e.g. ASME B31.3. See 4.7 for more details. The flange designs have been selected to achieve a minimum safety factor of 2,0 when subjected to a design pressure equal to ASME B16.5 pressure temperature ratings within the temperature li
12、mits of this International Standard. The main body of this International Standard contains all necessary information on how to manufacture and supply flange and seal ring materials, such as flange dimensions and material requirements; seal ring dimensions and material requirements; bolting dimension
13、s and material requirements; requirements to tolerances and surface finish; requirements to designation and marking of finished products. Normative annexes A and D cover the following topics: structural capacity equations for flange assemblies; bolt dimensions and masses. Informative annexes B, C, E
14、, F and G cover the following topics: how to apply the flanges to special geometries of valves and equipment nozzles; quality management; installation and assembly instructions, and guidelines on how to repair damage and irregularities on sealing surfaces; masses of all standard components; suitable
15、 dimensions of alternative metric bolting. BS EN ISO 27509:2012INTERNATIONAL STANDARD ISO 27509:2012(E) ISO 2012 All rights reserved 1Petroleum and natural gas industries Compact flanged connections with IX seal ring 1 Scope This International Standard specifies detailed manufacturing requirements f
16、or circular steel and nickel alloy compact flanged connections and associated seal rings, for designated pressures and temperatures in class designations CL 150 (PN 20) to CL 1500 (PN 260) for nominal sizes from DN 15 (NPS ) to DN 1200 (NPS 48), and for CL 2500 (PN 420) for nominal sizes from DN 15
17、(NPS ) to DN 600 (NPS 24). NOTE NPS is in accordance with ASME B36.10M and ASME B36.19M. This International Standard is applicable to welding neck flanges, blind flanges, paddle spacers and spacer blinds (paddle blanks), valve/equipment integral flanges, orifice spacers, reducing threaded flanges an
18、d rigid interfaces for use in process piping for the petroleum, petrochemical and natural gas industries. This International Standard is applicable within a temperature range from 196 C to +250 C. This International standard is not applicable for external pressure. 2 Normative references The followi
19、ng referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2768-1, General tolerances Part 1: Tolerances for linear
20、 and angular dimensions without individual tolerance indications ISO 4288, Geometric Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in cir
21、cular cross-section conduits running full Part 1: General principles and requirements ISO 5167-2:2003, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 2: Orifice plates ISO 14313, Petroleum and natural gas industries P
22、ipeline transportation systems Pipeline valves ISO 80000-1:2009, Quantities and units Part 1: General ASME B16.5, Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard ASME B16.34, Valves Flanged, Threaded and Welding End ASME B1.20.1, Pipe Threads, General Purpose (Inch) AS
23、ME B31.3, Process Piping BS EN ISO 27509:2012ISO 27509:2012(E) 2 ISO 2012 All rights reservedEN 1092-1, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 1: Steel flanges EN 1779, Non-destructive testing Leak testing Criteria for method and tec
24、hnique selection 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 class CL ASME pressure class in accordance with ASME B16.5 and ASME B16.34 3.1.2 compact flanged connection CFC non-gaske
25、ted bolted static pipe connection including two flanges and where the bolt loads are transferred through metal to metal contact between the flange faces 3.1.3 gasket barrier to prevent the passage of fluids, but which does transmit all loads between flanges EXAMPLE As shown in EN 1591-1:2001, Figure
26、 3. 3.1.4 purchaser individual or organization that buys the pipe connection on behalf of the user and/or operator or for its own use 3.1.5 seal component providing a barrier to prevent the passage of fluids, transmitting no significant loads between the flanges 3.1.6 supplier individual or organiza
27、tion that takes the responsibility for the supply of the pipe connection and its conformance with this International Standard 3.2 Symbols A outside diameter of neck Amaxmaximum outer diameter to accommodate standard tools Aminminimum neck outer diameter listed in Table 7 to Table 12 Area015cross-sec
28、tional area of the neck/pipe calculated from t015Areaeqvcross-sectional area of a special flange neck geometry calculated from teqvB bore diameter, where the bore should not exceed the maximum listed bore in this International Standard Bmaxmaximum listed bore diameter BS EN ISO 27509:2012ISO 27509:2
29、012(E) ISO 2012 All rights reserved 3Bminminimum bore diameter for which the face angles are valid B1 minimum bore diameter for flange to be blinded NOTE B1 is also the start diameter for blind and reducing threaded flange face angles. BCD bolt circle diameter dBbolt size dpaverage diameter of neck
30、end = (A+B)/2 DA1 internal diameter of groove DA3 outer diameter of groove DG4 seal ring seal diameter DW1 inner recess diameter DW2 outer recess diameter DW3 outside diameter of flange DW4 flange to neck fillet outer diameter e radial distance between BCD and dpeB(DW3 + DW2)/4 BCD/2 ep(DW3 + DW2)/4
31、 (A+B)/4 E1 depth of groove E2 depth of recess E3 depth of recess for gasket FAapplied axial force FcBbolt total plastic capacity (root area number of bolts yield strength) Ffflange axial load capacity without effect of bolt prying FfPflange axial load capacity including the effect of bolt prying Fe
32、ndend cap force calculated to seal ring seal diameter FRresulting force from external tension force FAand external bending moment MAfyflange material yield strength at temperature HP1 thickness of PB, PS and OS HW3 flange thickness HW5, HT5 overall length L bolt hole diameter L1,L2,L3 bolt hole dept
33、hs MAapplied bending moment n number of bolts p internal pressure in N/mm2BS EN ISO 27509:2012ISO 27509:2012(E) 4 ISO 2012 All rights reservedRA radius RB radius RC radius (maximum value tabulated) RV1 neck to flange ring radius on integral flanges t pipe wall thickness tminminimum neck thickness th
34、at can be used which is defined by the standard pipe outer diameter, A, and maximum listed bore diameter, Bmax. tmaxthe maximum neck thickness that can be used which is defined by Amaxand the minimum listed bore diameter t015the wall thickness giving the smallest possible face angle (0,15) teqvthe w
35、all thickness calculated from a special flange neck geometry X half major ellipse axis Y half minor ellipse axis A2 groove angle B1 flange face bevel angle B2 effective face angle/rear face bevel angle flange utilization ratio 3.3 Abbreviated terms BL blind flange CFC compact flanged connection CL c
36、lass DN nominal pipe diameter (expressed in millimetres) ID internal diameter IF integral flange (as part of some other equipment or component) IX special metallic seal ring applied in Clause 4 LB line blinds (including PS and PB) NPS nominal pipe size (expressed in inches) OD outer diameter OS orif
37、ice spacer PB paddle blank PN nominal pressure (bar) PS paddle spacer PTFE polytetrafluoroethylene RI rigid interface BS EN ISO 27509:2012ISO 27509:2012(E) ISO 2012 All rights reserved 5RT reducing threaded flange WN weld neck 4 Design 4.1 General In order to be compliant with this International Sta
38、ndard, CFCs fulfil the minimum design requirements outlined below. They have been designed for face-to-face make-up for transfer of the bolt loading through the flange faces. They have been designed so that a static mode is maintained in the bolted joint up to 1,5 times the specified pressure/temper
39、ature rating, see 7.2. Static mode is maintained as long as the difference between maximum and minimum nominal stress sustained by the bolts in the joint does not exceed 5 % of the minimum values specified in Table 3. They have been standardized to cover as a minimum the same pressure temperature cl
40、ass designations and sizes as can be found in ASME B16.5 with equal or better performance. They have been standardized to fit with commonly used standards by the valve industry (e.g. ASME B16.34, ISO 14313 and the EN 12516 series of parts), and other valve standards which make reference to these sta
41、ndards for pressure design. The weakest part of flanged connections according to this International Standard regarding fatigue failure is always located somewhere in the transition from flange to pipe or flange to nozzle neck of an equipment or valve. The bolted joint itself is never subjected to fa
42、tigue load if considerations to cycling temperatures are taken when selecting bolt material, see 6.3. 4.2 Design principles Figure 1 shows the design principles of compact flanges and its seal system according to this International Standard. The flange face includes a slightly convex bevel with the
43、highest point, called the heel, adjacent to the bore and a small outer wedge around the outer diameter of the flange. The assembly is made up by tightening/tensioning the flange bolting which pulls the two connector halves together. The bevel angles have been standardized for different and relevant
44、adjoining pipe wall thicknesses for each welding neck flange of a given size and pressure class. For the IX seal ring, axial forces are exerted on the taper of the metal seal ring and translated into a radial sealing force. Furthermore with increased pre-load, the bevel is closed and face to face co
45、ntact is achieved at the outer wedge while most of the bolt pre-load is transferred as compressive forces between the flange faces at the heel, as illustrated in Figure 1. The arrows in the figure indicate the applied forces/pressure and the contact forces after make-up and during normal operation.
46、The principle design of the flange face includes two independent seals. The first seal is created by application of seal seating stress at the flange heel. However, an undamaged flange heel may not seal at any extreme load condition, but the heel contact will be maintained for pressure values up to
47、1,5 times the flange pressure rating at room temperature for any combination of WN flange and a corresponding pipe within given limits of pipe wall thicknesses in tables of dimensions. This requirement is only applicable when the WN thickness fulfils the code requirement for minimum pipe wall thickn
48、ess for the actual material. The main seal is the IX seal ring. The seal ring force is provided by the elastic stored energy in the stressed seal ring. Any heel leakage will give internal pressure acting on the seal ring inside intensifying the sealing action. BS EN ISO 27509:2012ISO 27509:2012(E) 6
49、 ISO 2012 All rights reservedThe design aims at preventing exposure to oxygen and other corrosive agents in the way that adjoining flanges remain in contact along their outer circumference for all allowable load levels. Thus, this prevents corrosion of the flange faces, the stressed length of the bolts and the seal ring. The back face of the flange in the made-up position is parallel to the flange face in order to prevent bending of the bolts in the
