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Surface / Touch Temperature

Outer surface (touch) temperature of an insulated pipe and a personnel-protection touch-safety verdict

Service Temperature

°C

Hot fluid / pipe-wall temp (LTHW flow ≈ 75)

Ambient Temperature

°C

Surrounding air (plantroom / indoor)

Pipe Outside Ø

Bare pipe OD (42.4 = DN32 steel)

Insulation Thickness

0 = bare pipe

Conductivity (k)

W/m·K

Design λ (0.04 = mineral wool)

Surface Film (h)

Touch-safe Limit

°C

Personnel-protection limit (60 bare metal, ASTM C1055; raise for non-metallic cladding)

Enter pipe OD to calculate surface temperature