What is the calculated thickness of a seamless, unstayed dished head made of SA-285 C with a diameter of 1235 mm, under maximum pressure?

To determine the calculated thickness of a seamless, unstayed dished head made of SA-285 C under maximum pressure, it's important to apply the appropriate formulas derived from the ASME Boiler and Pressure Vessel Code.

The thickness of a dished head can be calculated using the formula specifically designed for unfired pressure vessels, which takes into account the material properties, the internal pressure, the diameter of the head, and a safety factor. For a dished head, one generally uses the following formula for thickness:

( t = \frac{P \cdot D}{2 \cdot S} + C )

Where:

• ( t ) is the required thickness.

• ( P ) is the maximum internal pressure.

• ( D ) is the outside diameter of the head.

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

• ( C ) is a corrosion allowance.

Using SA-285 C, known for its good weldability and tensile strength for pressure vessels, allows engineers to determine the stress values needed for the calculations. After substituting the material properties, pressure values, and head dimensions into the appropriate formulas, the calculations yield a required thickness.

In this context, the calculated thickness of