Various tips

Better sphere

  • Add a cube
  • Add Subdivision modifier (levels viewport: 3, render: 3, optimal display: unchecked)
  • Add Cast modifier (factor: 1.43)
  • Apply them
  • Subdivide and smooth as wanted

Auto smooth whatever

  • Green triangle
  • Normals
    • Auto smooth (checked, 30°)

Pipe thickness

  • Use a Solidify modifier