Carbon steel pipe flanges Specification for (Over 24 inches nominal size) For the petroleum industry BS 3293:1960 BRITISH STANDARD

Transcription

1 BRITISH STANDARD CONFIRMED OCTOBER 3 BS 3:60 Incorporatg Amendment No. Specification for Carbon steel pipe flanges (Over 4 ches nomal size) For the petroleum dustry

2 BS3:60 Co-operatg organizations This British Standard, havg been approved by the Petroleum Equipment Industry Standards Committee and endorsed by the Chairman of the Engeerg Divisional Council, was published under the authority of the General Council on December 60 BSI The followg BSI references relate to the work on this standard: Committee reference PEE/ Draft for comment CZ(PEE) 3 The Petroleum Equipment Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the followg Government departments and scientific and dustrial organizations: British Iron & Steel Federation* Council of British Manufacturers of Petroleum Equipment* Engeerg Equipment Users Association Federation of British Rubber and Allied Manufacturers Institute of Petroleum Mistry of Power Oil Companies Materials Association* The dustrial organizations marked with an asterisk the above list, together with the followg, were directly represented on the committee entrusted with the preparation of this British Standard: British Valve Manufacturers Association National Association of Drop Forgers and Stampers Amendments issued sce publication Amd. No. Date of issue Comments 004 August Indicated by a sidele the marg ISBN

3 BS3:60 Contents Page Co-operatg organizations Inside front cover Foreword ii Section. General Scope Designation and pressure/temperature ratgs 3 Flange facgs 4 Nomal sizes Section. Materials 5 Materials for flanges 6 Boltg materials Section 3. Dimensions and Tolerances Flanges 8 Flange facgs and gaskets Flange boltg dimensions 0 Spot-facg and back-facg of flanges Section 4. Inspection Inspection 3 Repair of defects 3 Section 5. Markg 3 Markg 3 Section 6. Preparation and Despatch 4 Preparation 3 5 Despatch 3 Table Dimensions of flanges, Class 50 4 Table Drillg, boltg and facg dimensions for flanges, Class50 5 Table 3 Dimensions of flanges, Class 0 6 Table 4 Drillg, boltg and facg dimensions for flanges, Class0 Table 5 Dimensions of flanges, Class Table 6 Drillg, boltg and facg dimensions for flanges, Class400 Table Dimensions of flanges, Class Table 8 Drillg, boltg and facg dimensions for flanges, Class600 Table Dimensions of compressed asbestos fibre gaskets Table 0 Numbers and dimensions of rg-jot gaskets for Class 0,400 and 600 flanges 3 BSI i

4 BS3:60 Foreword This British Standard makes reference to the followg British Standards: BS503, Steels for fired and unfired pressure vessels. Forggs. BS560, Steel pipe flanges and flanged fittgs (nomal sizes to 4 ) for the petroleum dustry. BS50, Boltg for the petroleum dustry. BS335, Pipg systems for petroleum referies and petrochemical plants. and to the followg American Standards Association Standard (obtaable through the British Standards Institution): A.S.A. B6.0, Rg-jot gaskets and grooves for steel pipe flanges. This British Standard is one of a series prepared under the authority of the Petroleum Equipment Industry Standards Committee. It is complementary to BS560, Steel pipe flanges and flanged fittgs (Nomal sizes to 4 ) for the petroleum dustry. In view of the ternational character of the petroleum dustry care has been taken to ensure terchangeability practice between flanges of the sizes covered which are produced by British and American manufacturers. At present there is no national American standard for steel flanges above 4 nomal size. The dimensions given here are, however, general conformity with the standard practice of the American Manufacturers Standardization Society of the Valve and Fittgs Industry (SP44) and with those currently adopted by the prcipal American flange makers. Acknowledgment is made to the American Standards Association, the American Society for Testg Materials and to the American Manufacturers Standardization Society of the Valve and Fittgs Industry for data use. A British Standard does not purport to clude all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an side front cover, pages i and ii, pages to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments corporated. This will be dicated the amendment table on the side front cover. ii BSI

5 BS3:60 Section. General Section. Materials Scope This British Standard is a material and dimensional standard only and applies to forged carbon steel slip-on and weldg neck flanges of nomal sizes6 and larger, for use the petroleum dustry. Drillg, boltg, facg and thickness dimensions are applicable also to tegral end flanges of valve and fittgs. Four classes of flanges are provided for, namely Classes50, 0,400 and 600. The standard does not clude pressure/temperature ratgs; the flange designations quoted are for identification purposes only. Designation and pressure temperature ratgs To facilitate orderg and to ensure terchangeability, flanges this standard are designated as Classes50, 0,400 and 600. These class designations, however, do not imply specific pressure/temperature ratgs the same manner as flanges accordance with BS 560. Users shall therefore satisfy themselves that the flanges selected are adequate for the tended duty. Where it is required to use the flanges this standard at temperatures below 0 F reference should be made to BS Flange facgs For Class50 flanges, raised facgs only are specified. For Classes 0,400 and 600 flanges, both raised facgs and rg-jot facgs are specified, and the purchaser shall specify when orderg, which type of facg is required. The high facg is the regular type of raised facg for flanges of Classes 50 and 0, and the / 4 high facg is the regular type of raised facg for flanges of Classes 400 and Nomal sizes The nomal size of a flange as shown the tables is the same as the nomal. 5 Materials for flanges Flanges shall be carbon steel forggs to the followg specification, full details of which are contaed BS 503 Material to BS Grade Class A or B. (A.S.T.M. A05, GradeI) may be supplied if specified by the purchaser 6 Boltg materials All boltg material shall comply with BS 50 ). For pressures and temperatures above 5 psi and 450 F, bolts shall be of alloy steel conformity with Part of the above standard, and nuts shall be of carbon or alloy steel conformity with Part. For pressures and temperatures up to and cludg 5 psi and 450 F, carbon steel bolts and nuts complyg with Part3 of the above standard may be used. Section 3. Dimensions and tolerances Flanges British Standard BS Grade Class A or B. Comparable A.S.T.M. Standard A05 Grade II a) Flange dimensions. Flange dimensions shall conform to those given Table, Table 3, Table 5 and Table. In no case, regardless of the type of facg provided and the tolerances referred to Clause b), shall the mimum thickness of a flange, as specified the tables listed above, be reduced order to provide adequate height for a raised facg or adequate depth for a rg groove, except where a Class50 or a Class 0 flange is provided with a raised facg, when the height of the facg is cluded the mimum flange thickness specified. b) Tolerances on flange dimensions. The followg are the tolerances permitted on flange dimensions: i) Slip-on weldg flanges (Table, Table 3, Table 5 and Table ). On flange bore Dimension B On flange thickness Dimension C ) Boltg for the petroleum dustry. BSI

6 BS3:60 On overall length through hub Dimension Y (Table ) Dimension Y (Table 3, Table 5, Table ) ii) Weldg-neck flanges (Table, Table 3, Table 5 and Table ). a On flange bore Dimension B On flange thickness On overall length through hub a weldg end of hub Dimension C 8 Flange facgs and gaskets a) Flange facg dimensions. Flange facg dimensions shall conform to those given Table, Table 4, Table 6 and Table 8. ± / 8 + / Dimension Y (Table ) ± Dimension Y / 8 (Table 3, Table 5, Table ) Dimension A (Table ) + 5 Dimension A (Table 3, Table 5, Table ) a In no case, regardless of the tolerances permitted on flange bore (B ) and outside hub diameter (A and A ), shall the thickness of the weldg end of a weldg-neck flange be less than 8 per cent of the nomal thickness of the pipe to which it is to be attached. Raised facgs shall be fished accordance with the requirements of BS560 ). Rg-jot grooves shall be mached true with the face and concentric with the bolt circle and the bore of the flanges. Grooves shall be fished smooth and shall be free from ridges and chatter marks. b) Tolerances on flange facg dimensions. The followg are the tolerances permitted on flange facg dimensions: i) Raised facgs (Table, Table 4, Table 6 and Table 8). On outside Dimension R ± / 64 raised face ii) Rg-jot facgs (Table 4, Table 6 and Table 8). On pitch Dimension P ± groove On width of groove Dimension F ± On depth of groove Dimension E + / 64 0 On 3 flank ± angle of groove c) Gasket dimensions. Dimensions of compressed asbestos fibre gaskets for use with raised facgs are given Table. Dimensions of rg-jot gaskets are given Table 0. d) Tolerances on gasket dimensions. The followg are the tolerances permitted on gasket dimensions: i) Compressed asbestos fibre gaskets (Table ). Tolerances on these gaskets are not specified. ii) Rg-jot gaskets (Table 0) 3). On average pitch Dimension P ± 0.00 rg On width of rg Dimension A ± On height of rg Dimension H a ± / 64. On width of flat Dimension C ± On corner radius Dimension R ± / 64 On 3 flank angle of rg Flange boltg dimensions ± a A plus tolerance of 3 / 64 ch on height is permitted provided that the variation the height of any given rg does not exceed / 64 ch throughout its entire circumference. The number of bolts, their size and the bolt circle diameter for each class and size of flange shall be as given Table, Table 4, Table 6 and Table 8. Bolt holes shall be pitched evenly around the bolt circle. 0 Spot-facg and back-facg of flanges Flanges need not be spot-faced or back-faced provided that their backs are parallel, with, to their faces and the fillets of their hubs do not terfere with the full bearg of the fasteng nuts. ) BS560, Steel pipe flanges and flanged fittgs (Nomal sizes to 4 ) for the petroleum dustry. 3) Extracted from A.S.A. Std. B 6.0, Rg-jot gaskets and grooves for steel pipe flanges (obtaable from the British Standards Institution). BSI

7 BS3:60 When spot-facg is required its diameter shall not be less than the dimension across the corners of the appropriate nut plus / 8 ch. When a spot-facg cuts to the fillet of a flange its diameter shall not exceed the dimension across the corners of the nut by more than 3 ch. When a flange is back-faced the fillet may be reduced but not elimated entirely. A sharp corner at the junction of the flange and its hub shall not be permitted. The specified mimum thickness of any flange whether or not it is spot-faced or back-faced shall not be exceeded by more than the tolerance permitted under Clause, nor shall the process of spot-facg or back-facg reduce its thickness at any pot to less than the specified mimum. Section 4. Inspection Inspection The purchaser or his representative shall have free access, at all reasonable times, to those parts of the manufacturer s works engaged upon his contract and shall be at liberty to spect, at any stage of manufacture, the materials covered by this contract. He shall be at liberty to reject any material which does not comply with the requirements of this standard. NOTE This standard does not make provision for the pressure testg of loose flanges. These may be tested after attachment to pipe or equipment. The test pressure will then depend on the requirements of the Code to which the pipe or equipment has been fabricated. Repair of defects Defects which do not impair the strength of a flange may be welded by a procedure approved by the purchaser. They shall be cleaned out to sound metal before weldg and shall be submitted to the purchaser s spector for approval this condition, after which they may be welded if the spector so agrees. Such welds need not be heat treated, unless required by the spector. When the weldg of defects is permitted the weldg rod shall be such as to produce a weld havg characteristics similar to the parent metal. Section 5. Markg 3 Markg The followg markgs are required on flanges covered by this standard: a) The manufacturer s name or trade mark. b) BS 3 c) The word Steel. d) Nomal ches. e) On flanges provided with rg-jot facgs, the letter R followed by the appropriate rg number, this markg beg located on the flange edge. Section 6. Preparation and despatch 4 Preparation Patg of fished flanges shall be optional to the manufacturer, unless otherwise specified by the purchaser. Mached surfaces shall be well covered with an approved rust-hibitg composition. 5 Despatch Flanges shall be fastened together such a manner that they are paired and no flange facgs rema exposed. Exposed facgs of sgle flanges shall be protected over their entire surface with a suitable close-fittg protector securely attached at not less than four pots. The type of protector and method of attachment shall be approved by the purchaser. Other methods of preparation for despatch shall be subject to agreement between the purchaser and the manufacturer. BSI

8 BS3:60 Table Dimensions of flanges, class Nomal flange / 4 3 / / / / / / 4 5 / 4 5 Thickness of flange m. large end of hub diameter of small end of hub: Weldg neck Length through hub Flange bore Fillet radius Slip-on Weldg-neck Slip-on Weldg-neck O C X A Y Y R B B / 8 / / 8 3 / 8 5 / 8 5 / 8 3 / 4 3 / 4 3 / / / / / / / / / 4 3 / / / 8 5 / / / / / / 4 / 4 / 4 / / 8 3 / 8 3 / 8 6 / 4 / 4 / 4 / 4 / 4 / 4 / 4 40 / 4 4 / 4 44 / 4 46 / 4 48 / 4 To be specified by the purchaser NOTE For relevant drillg, boltg and facg dimensions, see Table. NOTE For tolerances permitted on flange dimensions, see Clause. NOTE 3 The hubs of slip-on weldg flanges may be cyldrical or, alternatively, may have a draft of not more than on the outside surface for forgg purposes. NOTE 4 Each sketch at the head of this table depicts a flange with a raised facg. The dimensions C, Y, and Y, therefore, clude the height of the facg (see Clause ). If any other type of facg is required its height shall be additional to the mimum flange thickness. 4 BSI

9 BS3: Table Drillg, boltg and facg dimensions for flanges, class Nomal Diameter of bolt circle 3 3 / / 4 45 / 4 4 / / / 4 56 D Number of bolt holes Drillg Diameter of bolts / 4 / 4 / 4 Diameter of bolt holes 3 / 8 3 / 8 3 / 8 5 / 8 5 / 8 5 / 8 5 / 8 5 / 8 5 / 8 5 / 8 5 / 8 5 / 8 Raised face diameter / 4 3 / / / 4 40 / 4 4 / 4 44 / R Length of stud-bolts (see Note 3) 6 3 / 4 3 / / / / 4 Length of headed bolts (see note 3) NOTE For relevant flange dimensions, see Table. NOTE For the tolerance permitted on dimension R, see Clause 8. NOTE 3 The ends of all stud-bolts shall be rounded or chamfered. Stud-bolt lengths Column do not clude the heights of these ends. The lengths for headed bolts Column 8 clude end heights. 5 3 / / / / 4 / 4 / 4 BSI

10 BS3:60 Table 3 Dimensions of flanges, class Nomal 6 flange / / / Thickness of flange m. diameter large end of hub diameter small end of hub Length through hub Slip-on Weldg-neck Slip-on and weldg-neck Fillet radius Slip-on Flange bore Weldg-neck O C X A A Y R B B 3 / / / 8 3 / / 8 3 / 8 8 / 8 3 / / / 8 6 / 4 / 4 / 4 / / 4 3 / 4 8 / / 4 / 8 3 / 8 6 / 4 / 4 / 4 / 4 / 4 / 4 To be specified by the purchaser NOTE For relevant drillg, boltg and facg dimensions, see Table 4. NOTE For tolerances permitted on flange dimensions, see Clause. NOTE 3 The hub taper on slip-on flanges may be contuous as shown the figure or be a compound taper, at the manufacturer s option. NOTE 4 Each sketch at the head of this table depicts a flange with a raised facg. The dimensions C and Y therefore, clude the height of the facg (see Clause ). If any other type of facg is required its height shall be additional to the mimum flange thickness. 6 BSI

11 BS3:60 Table 4 Drillg, boltg and facg dimensions for flanges, class Drillg Facg dimensions Raised Rg-jot Nomal Diameter Number Diameter Diameter face Pitch Groove Depth of Diameter of of bolt of bolts of bolts of bolt diameter diameter width groove E. raised circle holes Height of portion K. facg L. (see Note3) (See D R P F note3) / / 8 5 / 8 3 / 4 / 8 / 8 3 / 4 3 / 4 / 8 / / / / 8 33 / 8 / 8 3 / / 4 43 Rg Raised number face R3 R4 R5 R6 R R8 Length of stud-bolts (seenote4) 3 / 4 0 / 4 3 / 4 Rg-jot Raised face / / / 4 Length of headed bolts (see Note4) 8 0 / / 4 Rg-jot NOTE For relevant flange dimensions, see Table 3. NOTE For the tolerances permitted on flange facg dimensions, see Clause 8. NOTE 3 The height L of a rg-jot facg is equal to the depth E of the rg groove but is not subject to the tolerances on E. Raised portion or full-face may be supplied unless specified the order. NOTE 4 The ends of all stud-bolts shall be rounded or chamfered. Stud-bolt lengths Columns and3 do not clude the heights of these ends. The lengths for headed bolts Columns 4 and 5 clude end heights. 0 0 / 4 BSI

12 BS3:60 Table 5 Dimensions of flanges, class Nomal 6 flange / / 4 43 Thickness of flange m. diameter large end of hub diameter small end of hub Length through hub Slip-on Weldg-neck Slip-on and weldg-neck Fillet radius Slip-on Flange bore Weldg-neck O C X A A Y R B B / / / / 8 / 4 To be specified by 45 / / / / / / 4 3 / 8 3 / 8 / 8 / 8 / 4 / 4 / 4 the purchaser NOTE For relevant drillg, boltg and facg dimensions, see Table 6. NOTE For tolerances permitted on flange dimensions, see Clause. NOTE 3 The hub taper on slip-on flanges may be contuous as shown the figure or be a compound taper, at the manufacturer s option. 5 / 8 8 / 8 6 / 4 / 4 8 BSI

13 BS3:60 Table 6 Drillg, boltg and facg dimensions for flanges, class Nomal 6 Diameter of bolt circle Number of bolts Drillg Diameter of bolts Diameter of bolt holes Raised face diameter Pitch diameter Facg dimensions Groove width D R P F 3 3 / / 4 / 8 / 8 / 8 / 8 / 8 / / / Rg-jot Depth of groovee. Height of facg L. (See Note3) Diameter of raised portion K (See Note3) 3 / 8 33 / 8 / 8 3 / / 4 43 Rg number R3 R4 R5 R6 R R8 Length of stud-bolts (see Note4) Raised face / 4 3 / 4 3 / / 4 Rg-jot NOTE For relevant flange dimensions, see Table 5. NOTE For the tolerances permitted on flange facg dimensions, see Clause 8. NOTE 3 The height L of a rg-jot facg is equal to the depth E of the rg groove but is not subject to the tolerances on E. Raised portion or full-face may be supplied unless specified the order. NOTE 4 The ends of all stud-bolts shall be rounded or chamfered. Stud-bolt lengths Columns and 3 do not clude the heights of these ends. 3 / / / 4 BSI

14 BS3:60 Table Dimensions of flanges, class Nomal 6 flange 40 4 / / 4 Thickness of flange m. diameter large end of hub diameter small end of hub Length through hub Slip-on Weldg-neck Slip-on weldg-neck Fillet radius Slip-on Flange bore Weldg-neck O C X A A Y R B B 4 / / / / 4 4 / / / / / 4 / 4 3 / 4 0 / / 8 / 8 5 / 8 3 / 4 3 / 4 6 / 4 / 4 / 4 / 4 / 4 / 4 To be specified by the purchaser NOTE For relevant drillg, boltg and facg dimensions, see Table 8. NOTE For tolerances permitted on flange dimensions, see Clause. NOTE 3 The hub taper on slip-on flanges may be contuous as shown the figure or be a compound taper, at the manufacturer s option. 0 BSI

15 BS3:60 Table 8 Drillg, boltg and facg dimensions for flanges, class Normal 6 Diameter of bolt circle 40 / Number of bolts Drillg Diameter of bolts Diameter of bolt holes Raised face diameter Pitch diameter Facg dimensions Groove width D R P F / 8 / 4 / 4 / 8 / 8 3 / 8 3 / 8 5 / / / Rg-jot Depth of Diameter of groove E. raised Height of portion K facg L. (SeeNote3) (SeeNote3) 3 / 8 33 / 8 / 8 3 / / 4 43 Rg number R3 R4 R5 R6 R R8 3 Length of stud-bolts (See Note4) Raised face / / 4 5 Rg-jot NOTE For relevant flange dimensions, see Table. NOTE For the tolerances permitted on flange facg dimensions, see Clause8. NOTE 3 The height L of a rg-jot facg is equal to the depth E of the rg groove but is not subject to the tolerances on E. Raised portion or full-face may be supplied unless specified the order. NOTE 4 The ends of all stud-bolts shall be rounded or chamfered. Stud-bolt lengths Columns and 3 do not clude the heights of these ends. 4 / / / 4 BSI

16 BS3:60 Table Dimensions of compressed asbestos fibre gaskets A. For class 50 flanges 3 4 Nomal gasket / 4 3 / / / 4 40 / 4 4 / 4 44 / Inside gasket Diameter side bolts D D D / 4 / 4 3 / 4 3 / 8 / 4 3 / 4 40 / 8 4 / / / / / 8 54 B. For class0, 400 and600 flanges 3 / 4 3 / / / / / 4 5 / Nomal Diameter of gasket all classes Inside gasket Diameter side bolts D D D Class 0 Class 400 Class 600 Class 0 Class 400 Class / / 8 / 8 / / 8 3 / 8 3 / 8 / / / 4 35 / 8 3 / 4 / 8 / 4 40 / / / 8 33 / 8 / 8 / 4 / / / / 4 4 / 4 44 NOTE The outside diameters D of the gaskets are the same as the relevant raised facg diameters of the flanges. Diameters D are for use where it is desired to extend the gaskets to the flange bolts for centerg purposes. NOTE No tolerances are specified for these gaskets. BSI

17 BS3:60 Table 0 Numbers and dimensions of rg-jot gaskets for class0, 400 and600 flanges Normal pipe size 6 Pitch diameter of rg 3 40 / 4 Width of rg Height of rg Width of flat Rg number P A H C 3 / 4 3 / 4 3 / 4 / 8 / 8 / R3 R4 R5 R6 R R8 NOTE The presence of a small forgg f, located so that it does not prevent the rg from seatg properly the groove, is not objectionable. NOTE Dimensions for rg-jot gaskets the above table, together with dimensions of groove Table 4, Table 6, and Table 8, are identical with those for correspondg rg numbers A.S.A. Std. B.6.0. NOTE 3 For tolerances on rg-jot gaskets, see Clause 8. BSI

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