[VESSEL] ASME Code에 따른 VESSEL 두께 계산방법 (Head Thickness)

ASME Code에 따른 내압 두께 계산방법 (Head Thickness)

 

 

Thickness of Formed Heads under Internal Pressure (UG-32)

 

1. Ellipsoidal Head

P : internal design pressure

t : required thickness after forming

D : corroded inside diameter

L : equivalent spherical radius from Table UG-37

S : maximum allowable stress value

E : joint efficiency

 

 

2. Hemispherical Head

P : internal design pressure

t : required thickness after forming

D : corroded inside diameter

L : corroded inside radius

S : maximum allowable stress value

E : joint efficiency

 

 

3. Torispherical Head

P : internal design pressure

t : required thickness after forming

L : corroded inside crown radius

S : maximum allowable stress value

E : joint efficiency

 

 

4. Design Thickness

위에서 구한 두께 값에 Corrosion Allowance를 더한 두께가 Design Thickness가 된다.