Pipe Heat Loss Calculator & Insulation Savings

A bare steel pipe at 200 °C (20 °C ambient) loses ~268 W/m at DN15, ~760 W/m at DN50, ~1,441 W/m at DN100 and ~2,762 W/m at DN200. Loss rises steeply with temperature — a DN100 line goes from ~660 W/m at 120 °C to ~2,900 W/m at 300 °C.

50 mm of removable insulation on a DN100 pipe at 200 °C cuts the loss from ~1,441 to ~106 W/m (93%). Over 100 m at 8,000 h/yr that's ~133 kW saved, about 1,067 MWh of fuel-equivalent heat per year, and a touch-safe ~31 °C surface.

Here: ≤220 °C → 50 mm mineral-wool (Lamella); >220 °C → 100 mm (Wired mat), because conductivity rises with temperature. Both hold the outer surface ≤45 °C. The calculator sizes it for your pipe.

Valves, flanges and fittings on a pipe run need regular access; fixed lagging gets cut off and never refitted, leaving hot gaps. Inzonex Modular Insulation uses snap buttons and magnets where applicable for inspection access and refitting; its functional zipper provides access to the insulation core — so the whole line stays insulated, not just the straight runs.