What is the minimum required wall thickness of a superheater tube with a 40 mm O.D. under 2000 kPa gauge pressure?

To determine the minimum required wall thickness of a superheater tube subjected to a specific gauge pressure, calculations based on the tube's outer diameter, internal pressure, allowable stress of the material, and safety factors are essential.

For a superheater tube with a 40 mm outer diameter operating under a pressure of 2000 kPa (or 2 MPa), the calculation typically involves using the formula for wall thickness in relation to pressure. Assuming that the tube is made of a material like carbon steel, one would look at the appropriate design formulas, such as the Barlow formula, which states:

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

Where:

• ( t ) is the wall thickness,

• ( P ) is the internal pressure,

• ( D ) is the outside diameter,

• ( S ) is the allowable stress of the material,

• ( C ) is the corrosion allowance (often considered negligible in the computation of minimal thickness).

In this context, using the right values for the steel’s allowable stresses and inputting them into the formula will yield the minimum wall thickness. After performing the necessary calculations with 2000 kPa and the other parameters,