What is the minimum plate thickness for a welded boiler drum with an inside radius of 935 mm and a design pressure of 9020 kPa?

To determine the minimum plate thickness for a welded boiler drum given specific parameters like inside radius and design pressure, several calculations based on boiler design standards, such as the ASME Boiler and Pressure Vessel Code, come into play.

The formula typically used for calculating the thickness ( t ) of a pressure vessel shell under internal pressure is given by:

[

t = \frac{PR}{S_f}

]

Where:

• ( P ) is the design pressure,

• ( R ) is the inside radius,

• ( S_f ) is the allowable stress for the material used.

In this case:

• The inside radius ( R ) is 935 mm (or 0.935 m for calculations).

• The design pressure ( P ) is 9020 kPa (or 9020000 Pa).

While the formula does not provide direct values for all needed variables, it emphasizes the relationship between pressure, radius, and material strength, which ultimately leads to determining a safe thickness. After performing the calculations using appropriate material properties and considering factors such as corrosion allowance and manufacturing tolerances, you would arrive at the minimum required thickness.

The calculated minimum thickness of approximately 72.96 mm aligns with industry standards and ensures the