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Answer :
Final answer:
To determine the maximum allowable working pressure for a vessel shell, calculate the remaining thickness after the inspection interval and use the formula MAWP = (Allowable Stress x Remaining Thickness) / (Internal Diameter x Design Factor). In this case, the maximum allowable working pressure is 69.9 psi.
Explanation:
To determine the maximum allowable working pressure for a vessel shell, we need to consider the current thickness of the shell, its rate of corrosion, and the desired inspection interval. We also need to take into account the type of welds and the allowable stress for the material. In this case, the vessel shell has a thickness of 0.377" and is corroding at a rate of 0.002 inches per year. The inspection interval is 10 years, and the longitudinal welds are double-welded butt welds.
First, we need to calculate the remaining thickness of the shell after the desired inspection interval. Since the shell is corroding at a rate of 0.002 inches per year, after 10 years, it would have corroded by 0.002 x 10 = 0.02 inches. Therefore, the remaining thickness of the shell after the inspection interval would be 0.377 - 0.02 = 0.357 inches.
Next, we need to calculate the maximum allowable working pressure. The formula to calculate the maximum allowable working pressure (MAWP) is:
MAWP = (Allowable Stress x Remaining Thickness) / (Internal Diameter x Design Factor)
Given that the internal diameter is 60 inches, the allowable stress for the material is 14,700 psi, and the design factor for double-welded butt welds is typically 0.85.
Plugging these values into the formula, we get:
MAWP = (14,700 x 0.357) / (60 x 0.85) = 69.88 psi
Therefore, the maximum allowable working pressure for the vessel shell is 69.9 psi (psig).
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