Calculate the minimum thickness for a welded steel pipe of material SA-209 grade T1b with an O.D. of 273.05 mm at 2000 kPa.

To determine the minimum thickness of a welded steel pipe under internal pressure, it is important to apply the formulas derived from the ASME Code, specifically looking at the requirements for pipes made from material like SA-209 grade T1b. The thickness calculation often uses the equation:

[ t = \frac{P \cdot D}{2 \cdot S} + C ]

Where:

• ( P ) is the internal pressure (in this case, 2000 kPa).

• ( D ) is the outer diameter of the pipe (273.05 mm).

• ( S ) is the allowable stress for the material at the operating temperature.

• ( C ) represents a corrosion allowance (if applicable), but can sometimes be negligible for calculations.

Using the above equation guides us towards calculating the minimum required thickness for the pipe.

SA-209 grade T1b has an allowable stress value outlined in relevant standards which must be considered along with the specific pressure and diameter of the welded pipe. Notably, for this grade of material, the allowable stress is set based on expected service conditions, which significantly influences the resulting calculations.

When performing the calculations with the specified values and using the correct stress, it leads to a minimum