The following design data is specified: Design pressure, p Design temperature Weight of water Specific gravity of fluid Specific density of steel = = = Material yield points Material UTS at 50°C Young's modulus Corrosion allowance TBC 1.8N/mm² 180°C 1000kg/m³ = 1.2 = 7860 kg/m³ = = = 44000 psi @ 50°C; 34000 psi @ 200°C 80000 psi 188,000 N/mm² = 3mm TBC 1200 i/dia 600 minimum 2000i.da 250mm N/B Dia opening 16000 2500
A ‘Category 2’ construction, vertical carbon steel vessel shown has an overall length of
approximately 30m. It consists of two cylindrical shells of 2m and 1.2m inner diameters
connected by a conical transition piece. The top end is 10% torispherical with crown radius equal
to the cylinder inside diameter and the lower end closure is 2:1 semi-ellipsoidal in form.
The vessel is used for storing liquid with a specific gravity of 1.2 at a
pressure of 18 bars (1.8MPa) at a temperature of 180
oC and a lowest
temperature of -30oC. The vessel will be supported by a circular cylindrical
skirt which is welded to the vessel as shown. One 250mm diameter nozzle is
in the cylindrical shell as shown the vessel.
Using the appropriate sections of the supplied Pressure Vessel Code
extracts from PD 5500,
how could the heights of TBC be found ??
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