To calculate the weight of a finned tube, you need to consider the following parameters:

1. Outer Tube Diameter (OD): The diameter of the outer tube, including the finned portion.

2. Inner Tube Diameter (ID): The diameter of the inner tube, excluding the finned portion.

3. Tube Length: The length of the finned tube.

4. Fin Height: The height of the fins.

5. Fin Thickness: The thickness of the fins.

6. Fin Density: The number of fins per inch or per meter.

With these parameters, you can calculate the weight of the finned tube using the following steps:

Step 1: Calculate the total surface area of the fins

   - Calculate the outer surface area of the tube: π * OD * Tube Length

   - Calculate the inner surface area of the tube: π * ID * Tube Length

   - Calculate the surface area of one fin: (OD - ID) * Fin Height

   - Calculate the total surface area of the fins: Fin Density * (OD - ID) * Tube Length

Step 2: Calculate the weight of the finned tube

   - Calculate the volume of the tube: (π/4) * ((OD^2) - (ID^2)) * Tube Length

   - Calculate the volume of one fin: Fin Thickness * (OD - ID) * Tube Length

   - Calculate the total volume of the fins: Fin Density * Fin Thickness * (OD - ID) * Tube Length

   - Calculate the weight of the finned tube: (Volume of the tube + Total volume of the fins) * Density of the material

Note: The density of the material is required to calculate the weight accurately. Different materials have different densities, so you need to know the specific material of the finned tube.

By plugging in the values for the parameters mentioned above and using the formulas provided, you can calculate the weight of the finned tube.