20 k flange design
TRANSCRIPT
-
7/25/2019 20 k Flange Design
1/9
API 20K Flange Design Task Group
API SC6 Task Group
Date: June 26, 2008
-
7/25/2019 20 k Flange Design
2/9
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
-
7/25/2019 20 k Flange Design
3/9
$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
-
7/25/2019 20 k Flange Design
4/9
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
-
7/25/2019 20 k Flange Design
5/9
$@/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
-
7/25/2019 20 k Flange Design
6/9
$@/65 Seal ?ing GasketDesign Para%eters C.e"k per &i".en(erg 7et.o#
PI / Dimensions
7in! No. Bore Dia a8 Bore Pressure 7atin! 9ei!"t :idt"
B B ma8 P 9
B;/$ 4.*- 4.*4 01
-
7/25/2019 20 k Flange Design
7/9
-!#ril 8/3+5 20 ksi Flange Design Preli%inar!B
Stress Cal"ulations7et.o#: AS7& Se"tionEIII, Di)ision 2,Appen#i< 3
-
7/25/2019 20 k Flange Design
8/9
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(%
-
7/25/2019 20 k Flange Design
9/9
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