Industrial Insulation: Equipment, Thickness, Materials & Savings
Updated 12 June 2026 · ASTM C680 / ISO 12241 figures · by the Inzonex engineering team
The complete guide to industrial (mechanical) insulation: what it is, which materials and thicknesses to use, quantified heat-loss data for every common component — valves, flanges, pumps, tanks, headers, turbines — and how removable insulation finally covers the parts that fixed lagging leaves bare.
Heat loss: bare vs insulated, by surface temperature
| Surface temp | Bare loss | Insulated | Outer surface | Reduction |
|---|---|---|---|---|
| 100 °C | 800 W/m² | 74 W/m² | 27 °C | 90.7% |
| 150 °C | 1,300 W/m² | 134 W/m² | 33 °C | 89.7% |
| 250 °C | 2,300 W/m² | 152 W/m² | 35 °C | 93.4% |
| 350 °C | 3,300 W/m² | 255 W/m² | 46 °C | 92.3% |
| 450 °C | 4,300 W/m² | 381 W/m² | 58 °C | 91.1% |
| 600 °C | 5,800 W/m² | 612 W/m² | 81 °C | 89.4% |
Per m² of hot surface, ASTM C680 / ISO 12241, 20 °C ambient, 50 mm Lamella (≤220 °C) or 100 mm Wired mat (>220 °C).
Savings by equipment (per item, per year)
8,000 h/yr on natural gas. Every row links to a full page with temperature-by-temperature data for that component:
| Component | Typical T | Bare area | Heat saved | Energy/yr | CO₂/yr | €/yr |
|---|---|---|---|---|---|---|
| Valve (gate/control) | 350 °C | 0.35 m² | 1.1 kW | 10 MWh | 2.0 t | €582 |
| Flange pair | 350 °C | 0.22 m² | 0.7 kW | 6 MWh | 1.3 t | €366 |
| Steam trap station | 165 °C | 0.18 m² | 0.2 kW | 2 MWh | 0.4 t | €127 |
| Pump casing (feed-water) | 160 °C | 2.5 m² | 3.1 kW | 29 MWh | 6.0 t | €1,710 |
| Heat exchanger shell | 150 °C | 4 m² | 4.7 kW | 44 MWh | 8.9 t | €2,546 |
| Expansion joint | 280 °C | 1.6 m² | 3.9 kW | 36 MWh | 7.4 t | €2,113 |
| Steam header | 350 °C | 3 m² | 9.1 kW | 86 MWh | 17.4 t | €4,986 |
| Boiler door | 90 °C | 5.1 m² | 3.2 kW | 31 MWh | 6.2 t | €1,772 |
| Tank / vessel (per 10 m²) | 85 °C | 10 m² | 5.9 kW | 56 MWh | 11.3 t | €3,230 |
| Turbine casing | 350 °C | 15 m² | 45.7 kW | 430 MWh | 86.8 t | €24,930 |
| Exhaust manifold | 450 °C | 2 m² | 7.8 kW | 74 MWh | 14.9 t | €4,278 |
| Duct section (per 10 m²) | 250 °C | 10 m² | 21.5 kW | 202 MWh | 40.8 t | €11,726 |
A plant carries dozens of each. Run your own line items in the whole-plant calculator or the pipe heat-loss calculator.
Materials: hot side and cold side
- Mineral wool (stone wool, Rockwool-type) — the workhorse of hot industrial insulation: non-combustible, stable to ~640 °C, cost-effective. Used as 50 mm Lamella mat (≤220 °C) or 100 mm Wired mat (220–600 °C). Also the standard core for mineral wool pipe insulation.
- Aerogel — same R-value at ~⅓–½ the thickness; for tight clearances, walkways and tracing. Hydrophobic.
- Ceramic fiber — the hottest duties: furnace doors, exhausts, +600 °C and beyond.
- Closed-cell elastomeric foam (Armaflex-type, nitrile rubber) — the cold side: condensation control and anti-sweat on chilled lines. Not for hot surfaces.
- Facings — silicone-coated glass cloth (to ~260 °C) or PTFE/high-temperature cloth; weather-, oil- and salt-resistant marine-grade facings for ships and onshore/offshore platforms.
Thickness by temperature (rule of thumb)
| Surface temperature | Core & thickness | Outer surface |
|---|---|---|
| up to 220 °C | 50 mm mineral-wool Lamella | ≤45 °C |
| 220–600 °C | 100 mm mineral-wool Wired mat | ≤45–50 °C |
| tight clearances, any T | aerogel, ~⅓–½ thickness | ≤45 °C |
Fixed lagging vs removable insulation — why valves stay bare
Straight pipe runs get fixed lagging once and keep it. The losses that remain on a real plant are the parts that move or need access: valves, flanges, manways, expansion joints, pump casings, boiler doors. Fixed cladding fitted there gets cut away at the first service and never refitted — so those parts stay bare for years, each radiating kilowatts. Removable insulation jackets (insulation blankets, pads, covers) close exactly that gap: quick-release fasteners, off in minutes, refit with no damage, engineered per component. That is Inzonex's product (up to +600 °C, surface ≤45 °C).
How to insulate a valve (or flange, or joint)
- Measure the component body and note the line temperature.
- Select the tier — 50 mm mineral wool ≤220 °C, 100 mm above, aerogel where space is tight.
- Fit the removable jacket around the body; close the fasteners; leave stems, instruments and bolt access clear.
- Verify ≤45 °C outer surface; remove and refit at every inspection — never cut fixed lagging onto serviceable parts.
Industrial insulation by sector
The same physics — and the same removable covers — apply across every hot-process industry: power plant insulation (boilers, steam lines, turbines, HRSG fittings — see real plants on the PowerAtlas), oil refinery and chemical-plant insulation, food, dairy and brewery insulation (kettles, pasteurizers, bottle washers — explore the brewery heat-loss map), pharmaceutical autoclaves, and marine/offshore service.
Every component, with computed data
Industrial insulation by country — climate-specific data
Heat loss depends on the ambient temperature, so the numbers differ by country. Each page below recomputes the ASTM C680 figures at that country's actual plant-site climate (WorldClim at real plant coordinates) and shows its industrial base from our open data:
FAQ
What is industrial insulation?
Industrial insulation (also called mechanical insulation) is thermal insulation applied to process equipment and pipework in plants — boilers, steam lines, valves, flanges, pumps, tanks, heat exchangers, turbines and ducts — to cut heat loss, protect workers (touch-safe surfaces) and reduce fuel use and CO₂. It is distinct from building insulation: the temperatures are far higher (up to +600 °C and beyond) and the components often need regular access.
Industrial insulation vs mechanical insulation — is there a difference?
No — they are the same discipline. 'Mechanical insulation' is the trade/specification term (common in North America); 'industrial insulation' the everyday one. Both cover hot and cold service insulation of mechanical systems: pipes, vessels, equipment and ducts.
What thickness should industrial insulation be?
Driven by the surface temperature, not the component: 50 mm mineral wool (Lamella) up to 220 °C, 100 mm (Wired mat) for 220–600 °C, because conductivity rises with temperature. Aerogel achieves the same R-value at roughly a third to half the thickness where clearance is tight. Properly sized, the outer surface stays touch-safe at ≤45 °C.
Which materials are used in industrial insulation?
Hot side: mineral wool (stone wool, Rockwool-type) as the workhorse, aerogel for thin profiles, ceramic fiber for the hottest duties. Cold side: closed-cell elastomeric foam (Armaflex-type nitrile rubber) against condensation. Facings: silicone-coated glass cloth or PTFE; marine-grade facings for ships and onshore/offshore platforms.
How much energy does industrial insulation save?
Per ASTM C680 at 20 °C ambient: a bare surface at 350 °C loses about 3,300 W/m²; insulated (100 mm mat) about 255 W/m² — a ~92% cut. A single bare valve at 350 °C wastes ~10 MWh/yr; a steam header ~86 MWh/yr. Across a plant the recoverable total is typically hundreds of MWh — payback usually under two years.
What is removable industrial insulation?
Soft, tailored covers (insulation jackets, blankets, pads) with quick-release fasteners, used on components that need maintenance access — valves, flanges, manways, expansion joints. They come off in minutes and refit with no damage, so the parts that fixed cladding leaves bare finally get insulated. Inzonex manufactures engineered removable insulation.
How do you insulate a valve or flange?
With a removable insulation jacket: measure the valve/flange, fit a tailored cover with quick-release fasteners around the body (leaving stem and instruments accessible), and refit it after every service. Never weld or glue fixed lagging onto parts that must be opened — that is why most plants' valves are bare.
Does industrial insulation help with CO₂ and ESG reporting?
Yes — saved heat divides by boiler efficiency to fuel energy, times the fuel's emission factor (natural gas ≈0.202 kg CO₂/kWh). One insulated 350 °C steam header avoids ≈17.4 t CO₂ per year. The figures are Scope-1 fuel combustion, suitable for ESG and CBAM reporting.