20 k flange design

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    API 20K Flange Design Task Group

    API SC6 Task Group

    Date: June 26, 2008

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    Design Anal!sis Pro"e#ure

    Yes

    No

    Design Verification

    Design meetsStatic Load

    requirements

    Redesign

    Design Validation

    Testing

    No

    Fatigue Analysis

    Design meetsFatigue life

    requirements

    Yes

    Redesign

    Sealability Analysis

    Design Flange

    Functional Design SpecificationStatic Loads per Task roup

    !onsensus

    Dynamic Loads"T#D

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    $oltDia%eter &sti%ation

    Bolt Diameter Based on Internal Pressure + Gasket Load and 20 No. bolts(Estimate purposes only, Bolt tren!t" # $% Dia & 'emp Deratin! not inluded)

    Bolt Grade B* L* B* L*$-Gr.//0

    201yield

    -1ield

    #2.- Dia, ield tren!t", psi 3-000 3-000 40000 40000 3-000

    'est Pressure 5ondition, Bolt Dia(Bolt tress at 46 y) $.*- $.*- -.2- -.2- $.*- $.2- $

    '(ser)ation: *arge $olt Dia%eter

    Con"erns+Design Consi#erations:

    For -ig. Strengt. $olts/Tappe# -ole #ept. nee# to (e a#uste# 1or

    %aterial !iel# #i11eren"es2 A)aila(ilit! o1 (olt %aterial it. uni1or% "ross se"tional properties

    3 A(ilit! to a".ie)e uni1or% %ake/up t.roug. applie# tor4ue

    5 *arger Flange 'D In"rease in e4uip%ent eig.t In"rease# "ost

    7onolit.i" e4uip%ent #esign: In"rease# -an#ling eig.t 7a".ining Cost

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    Alternate $olt 7aterials

    -ig.er Strengt., 920 to30 ksi !iel# %a! (e nee#e#

    -ig.er t.an 20 iel# Strengt. In"onel ;8 notin"lu#e# in API 6A;8 /// 30 ksi+0 ksi %a! (e

    in"lu#e# in neAC&

    Allo! (olting, .ar#ness 3 ?"+strengt. is li%ite# #ue to-!#rogen &%(rittle%ent .en "onne"te# to C P

    prote"tion

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    $@/65 Seal ?ing Gasket

    At 7ake/up "on#ition entire gasket36 SS,B "ross se"tion !iel#sGasket leakage "on"erns: aB C!"li" loa#s, (B At .ig. te%perature>e Cross se"tion to (e #esigne# ?e1eren"e: ? &i".en(ergs

    %et.o#B >e Cross se"tion is un#er #e)elop%ent.Design gui#elines Test proto"ol 1or Gasket nee#s to (e

    esta(lis.e#Con"erns: Cost o1 testing 7aterial Sele"te# ill )eri1!per1or%an"e o1 t.at %aterial

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    $@/65 Seal ?ing GasketDesign Para%eters C.e"k per &i".en(erg 7et.o#

    PI / Dimensions

    7in! No. Bore Dia a8 Bore Pressure 7atin! 9ei!"t :idt"

    B B ma8 P 9

    B;/$ 4.*- 4.*4 01

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    -!#ril 8/3+5 20 ksi Flange Design Preli%inar!B

    Stress Cal"ulations7et.o#: AS7& Se"tionEIII, Di)ision 2,Appen#i< 3

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    Flange Design

    API 6A Flange Design: ?e1eren"e: API T? 6AF2

    AS7& 7et.o#olog!, AS7& Se"tion EIII, Di)2, Appen#i< 5

    Design Alloa(le per API 6A, $ase# on Tres"a T.eor! Stress Intensit!B:For API ;K 7aterial

    orking Pressure: S% 2+ 3BHS!

    Test Pressure: ST 083BH S!

    $olt Alloa(le: API 6A:

    83 o1 iel#, 7a< Stress, 7ake up loa# 0 o1 S!

    AS7& 7et.o#, Se"tion EIII, Di)2, 200; ition:

    S% *oer o1 2+ 3BHS! or ST TS+25 S(% Alloa(le -!#rostati" Pressure: S(% 0= S!

    S(% L S(( loer o1 53 S or 253 S/S(%

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    Su%%ar!

    $olt SiMe a11e"ts 1lange 'D$ >ee# .ig.er strengt. (olt %aterial

    $ Deepater appli"ation re4uires "onsi#erations 1or a11e"ts o1 CPprote"tion an# potential e