7/28/2019 ASME Design of Buoy for FRP Pipe Testing
2/5
Design of shell (UG 28)
Correlations
1. Diameter thickness ratio=Do/t
2. Length diameter ratio=L/Do
3. Allowable pressure for values of the Factor-A falling to left
of the material or temperature line in Fig G.
Pa=2AE/(3*(Do/t))
4. Allowable pressure for values of the Factor-A falling to
Right of the material or temperature line in Fig G.
Pa=4B/(3*(Do/t))
Calculations
MATERIAL Mild steel
INNER DIAMETER OF VESSEL Di 2500 mm
OUTER DIAMETER OF VESSEL Do 2520 mm
EFFECTIVE LENGTH OF VESSEL Le 3000 mm
DESIGN PRESSURE Pd 100 Kpa
ASSUMED THICKNESS ta 10 mm
YOUNGS MODULUS E 210000000 Kpa
DIAMETER THICKNESS RATIO Do/ta 252LENGTH DIAMETER RATIO L/Do
1.19
STRAIN FACTOR-A A 0.0003
STRESS FACTOR-B B 30 mpa
Allowable pressure= Pa=4B/(3*(Do/t)) =158.7 Kpa0
1
2
3
4
5
6
7
6 7 8 9 10 11 12Diameter&height(mm
)
thickness(mm)
Thickness of shellheight
diameter
Height Diameter Thickness A B
Allowable
Pre(Pa)kpa D/L
1 4.37 7 0.0005 50 106.44 4.37
1.5 3.57 8 0.00038 38 113.03 2.38
2 3.1 9 0.0003 30 115.45 1.55
2.5 2.75 9 0.0003 30 130.05 1.1
3 2.5 10 0.0003 30 158.7 0.833333
3.5 2.35 10 0.00022 22 123.76 0.671429
4 2.2 11 0.00025 25 165 0.55
4.5 2.06 10 0.00022 22 141.02 0.457778
5 1.95 10 0.00018 18 121.82 0.39
5.5 1.863457 11 0.0002 20 155.86 0.33881
6 1.784124 11 0.0002 20 162.78 0.297354
7/28/2019 ASME Design of Buoy for FRP Pipe Testing
4/5
Design of torospherical Head(UG 23)
Correlations
1. Diameter thickness ratio=Do/t2. Length diameter
ratio=L/Do
3. Strain Factor A= 0.125/(Ro/t)
4. Allowable pressure for values of the Factor-A falling to left
of the material or temperature line in Fig G.
Pa=0.0625/((Ro/t)^2).
5. Allowable pressure for values of the Factor-A falling to
Right of the material or temperature line in Fig G.
Pa=B/(Ro/t)
MATERIAL Mild SteelINNER DIAMETER OF VESSEL Di 2500mm
OUTER DIAMETER OF VESSEL Do 2514mm
RADIUS OF TOROSPHERICAL HEAD Ro 2262.6mm
DESIGN PRESSURE Pd 100Kpa
ASSUMED THICKNESS ta 7mm
YOUNGS MODULUS E 210000000Kpa
STRAIN FACTOR-A A 0.0003867
STRESS FACTOR-B B 38mpa
Calculations
Allowable pressure= Pa= B/(Ro/t) = 165 Kpa
