Dish End Calculations as Per ASME Section VII Div 1
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Transcript of Dish End Calculations as Per ASME Section VII Div 1
ASME 8 Div 1 Appendix 1 Section 1.4 f Dished Heads
With ts/L < 0.002
1 of 2
E 1:= Joint Factor
___________________________________________________________________
M
3L
r+
4:= M 1.625=
tminP L⋅ M⋅
2 S⋅ E⋅ 0.2 P⋅−:= tmin 2.885= mm
if tmin t< "Acceptable Calculation", "Head Too Thin",( ) "Acceptable Calculation"=
t
L0.001=
Additional rules for thin heads t/L < 0.002
C1 ifr
D0.08> 0.692
r
D⋅ 0.605+, 9.31
r
D⋅ 0.086−,
:= C1 0.535=
Se C1 ET⋅t
r
⋅:= Se 1.678 10
3×=
C2 ifr
D0.08> 1.46 2.6
r
D⋅−, 1.25,
:= C2 1.25=
ASME 8 Division 1:- Torispherical Ends To UG32 and Appendix 1.4
P 0.2:= Design Pressure Mpa (Note:- 1 Mpa = 1 N/mm^2)
D 3000:= Inside Diameter mm
r 200:= Knuckle Radius mm
L 2450:= Spherical Radius mm
t 3.4:= Min Required Thickness After forming mm
S 138:= Design Stress Mpa
Sy 165.2:= Yield Strength at max design temp Mpa
ET 184590:= Youngs Modulus At Temperature Mpa
ASME 8 Div 1 Appendix 1 Section 1.4 f Dished Heads
With ts/L < 0.002
2 of 2
___________________________________________________________________________
if P Pmax< "Acceptable Calculation", "Head Too Thin",( ) "Head Too Thin"=
Mpa Pmax 0.1114=PmaxPck
1.5:=
Maximum Design Pressure P
Pck 0.167=Pck ifPe
Py8.29> 2.0 Py⋅, Pck,
:=
Pck 0.197=Pck ifPe
Py1≤ 0.6 Pe⋅, 0.408 Py⋅ 0.192 Pe⋅+,
:=
Py 0.084=PySy t⋅
C2 Re⋅ 0.5Re
r⋅
1−
⋅:=
Pe 0.849=PeSe t⋅
C2 Re⋅ 0.5Re
r⋅
1−
⋅:=
Re 1.68 103×=Re c r+:=
c 1.48 103×=c if ψ β<
a
cos β ψ−( )( ), a,
:=
ψ 0.456=ψL t⋅( )r
:=
β 0.955=β acosa
b
:=
b 2.25 103×=b L r−:=
a 1.3 103×=a 0.5D r−:=