Steam is one of the most expensive energy sources in any factory or power station. Poor insulation on steam pipework lets heat escape in transit, the steam cools, condensate increases and the boiler burns more fuel. Steam pipe insulation is both a safety matter and a financial one. Here are the essentials.
Why steam pipe insulation matters
- Energy cost — heat loss means higher fuel bills, and insulation is among the fastest-paying investments available
- Steam quality — minimising temperature drop and condensation in transit maintains dryness
- Less condensate — reducing water hammer, pipe damage and trap loading
- Personnel safety — preventing burns from hot pipe surfaces
- Process stability — stabilising the temperature and pressure reaching the equipment
Steam temperature follows pressure
The temperature of saturated steam is set by its pressure. The higher the pressure, the higher the temperature, so the material and thickness must be chosen for the operating pressure. The figures below are approximate references; consult steam tables for exact values.
| Low pressure (approx. 1 bar·g) | Saturation temperature about 120°C — glasswool pipe sections are adequate |
| Medium pressure (approx. 5 bar·g) | Saturation temperature about 159°C — glasswool or mineral wool |
| High pressure (approx. 10 bar·g) | Saturation temperature about 184°C — mineral wool recommended |
| High pressure (approx. 15 bar·g and above) | Saturation temperature above 200°C — mineral wool; consider Cerakwool for superheated steam |
Choosing the insulation
| Low and medium pressure steam (to 350°C) | Glasswool pipe sections — economical, acoustic, general purpose |
| High pressure and superheated steam (300°C+) | Mineral wool pipe sections — excellent heat resistance and durability |
| Extreme temperature superheated steam | Cerakwool — lining for the hottest sections |
| Cladding | Aluminum casing outdoors, ALGC indoors — waterproofing and radiant heat control |
| Confined space | Aerogel — high performance at low thickness |
The biggest heat loss — do not overlook valves and flanges
The most common mistake in steam insulation is leaving valves, flanges and steam traps uninsulated for ease of inspection. The heat loss from a single exposed valve can equal a considerable length of insulated straight pipe. A removable insulation jacket gives you both inspection access and insulation.
- Insulate valves, flanges and steam traps with removable jackets
- Match the thickness of the straight run — thin spots on fittings concentrate heat loss
- Jackets can be removed and refitted during scheduled overhauls
Heat loss checkpoints
- Select material and thickness on the maximum temperature at operating pressure
- Insulate not only straight runs but every valve, flange and trap
- Break thermal bridges at supports and hangers
- Keep cladding watertight to prevent moisture uptake — wet insulation loses performance fast
- Survey periodically with a thermal imaging camera to find leaking sections
✅Steam pipe insulation is among the fastest-paying insulation investments. Simply jacketing exposed valves and flanges produces a visible energy saving on its own.
💡Tell us the steam operating pressure and temperature, the pipe sizes and the number of valves and flanges, and we will quote the insulation, thickness and jackets together. Technical advice: +82 10-4266-9745
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