The context is the following:
- The system is: inlet pipe + control valve + outlet pipe.
- The fluid is natural gas
- The outlet pipeline is buried.
- No outlet pipe insulation.
- The minimum allowable temperature in the outlet pipe is -20°C.
- The minimum temperature at the control valve outlet flange is about -15°C (worst scenario)
The problem is that I need to calculate the length of outlet pipe so that the fluid temperature increase to 0°C.
My data are:
- Outlet pipe material: carbon steel (L360)
- Outlet pipe internal diameter: 570 mm
- Outlet pipe thickness: 20 mm
- Outlet pipe is buried 1 m deep.
- Average air temperature: 11°C
- Wind velocity: 10 m/s
My questions are:
1. Do you know where can find thermal conductivity data for ground? I know it strongly depends on the ground composition but I don't have anything...
2. Could you please share any Excel spreadsheet to perform that calculations?