Saturated steam at 10 bar is ~184 °C: economically, 50–80 mm of mineral wool covers most pipe sizes at today's energy + carbon prices (check 80–100 mm on DN200+); for personnel protection ≤60 °C, 50 mm typically suffices at this duty but verify per size. Superheated lines (300–540 °C) move to 80–120 mm and high-density material. These are reference points, not design — run your sizes and prices through the free calculator, and remember the bare valves on the line waste more than any thickness deficit on the straight runs.
Compute your own case: free heat-loss calculator · materials library: 12 datasheets · related: What is CUI (corrosion under insulation)? · What is economic thickness of insulation? · R-value vs k-value (λ) — what's the difference? · What insulation works at 600 °C?
