Steam Header & Manifold Insulation: Heat Loss & Savings

Steam headers and manifolds carry the hottest steam in the plant and have large bare surfaces studded with branch flanges and valves. Insulating the header and its fittings with removable covers is one of the highest-value energy savings available.

Direct answer: a bare hot steam surface loses roughly 2,800 W/m² at 300 °C and 4,100 W/m² at 430 °C (20 °C ambient, ASTM C680). Inzonex removable insulation cuts that by about 91%; high-temperature cases use the appropriate build-up to meet the required touch-safe target.

Heat loss vs insulated — by surface temperature

Surface temp	Bare loss	Insulated	Outer surface	Reduction
200 °C	1,800 W/m²	204 W/m²	40 °C	88.7%
300 °C	2,800 W/m²	201 W/m²	40 °C	92.8%
400 °C	3,800 W/m²	316 W/m²	52 °C	91.7%
430 °C	4,100 W/m²	354 W/m²	55 °C	91.4%

Per-m² flat-surface flux, ASTM C680 / ISO 12241, 50 mm Lamella (≤220 °C) or 100 mm Wired mat (>220 °C), 20 °C ambient. Multiply by the bare area.

Worked examples (per year, 8,000 h, natural gas)

Item	Heat saved	Energy/yr	CO₂/yr	€ saved/yr
A steam header (3.0 m², 350 °C)	9.1 kW	86 MWh	17.4 t	€4,986
A distribution manifold (1.5 m², 300 °C)	3.9 kW	37 MWh	7.4 t	€2,128

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FAQ

How much heat does a bare steam header & manifold lose?

At 20 °C ambient (ASTM C680): a steam header (~3.0 m², 350 °C) loses about 9.1 kW; a distribution manifold (~1.5 m², 300 °C) about 3.9 kW. Insulating a steam header saves ≈86 MWh and ≈17.4 t CO₂ per year (8,000 h).

Can you insulate steam headers and similar?

Yes. Headers carry branch valves and instruments that need access. Removable covers insulate the body and each fitting while staying serviceable. Inzonex covers steam headers, distribution manifolds and branch connections. The outer surface is reduced sharply; the insulation build-up is selected to meet the required touch-safe target while keeping the part serviceable.

How much does steam header & manifold insulation save?

Each item saves up to 96% of its bare loss. A steam header at 350 °C saves ≈4,986 €/yr of energy (≈86 MWh, ≈17.4 t CO₂) at typical gas prices; payback is usually under two years.

What insulation thickness is used?

Up to 220 °C surface: 50 mm mineral-wool (Lamella); above 220 °C: 100 mm (Wired mat), because conductivity rises with temperature. The build-up is selected by temperature: higher-temperature assets may need a thicker or higher-performance layer to meet a ≤45 °C touch-safe target.