Roxul Industrial Insulation Process - Manual (Page 71)

1.6 Insulation of boilers
1.6.1 Insulation of fire tube boilers
Load bearing ProRox ® insulation is a proven
solution in the insulation of flame tube-smoke
tube boilers. Insulation is easily mounted onto the
horizontal, cylindrical boiler surface and are easily
fastened to the boilers with metal straps. Metal
spacers, which always create thermal bridges,
can be omitted. Due to the compression
resistance of at least 210 PSF (10 kPa), the
cladding can be mounted directly onto the
Duraflex insulation. Alternatively, if the sheet
cladding is fitted so closely that it can adopt this
function, the fastening straps can be omitted.
The insulation is characterized by a consistent
rigidity and surface. Due to the lack of spacers,
it guarantees an even surface temperature
without temperature peaks (hot spots), which
pose a hazard in the form of skin burns.
The balanced surface temperature profile also
accounts for the thermography of a flame fire
tube boiler shown above. Wired mats are
generally used to insulate the area of reversing
chambers and are secured with pins and
spring clips.
The thermography of a flame tube-smoke tube
boiler, which is insulated with ProRox
® insulation.
(Source LOOS INTERNATIONAL, Loos Deutschland
GmbH) The areas insulated with ProRox
®
insulation show an even temperature distribution
without visibly, increased hot spots. The right
image shows the position of the thermographic
camera. Reading point Sp1 has a temperature of
71 °F (21.7 °C); reading point Sp2 is 70 °F (21.2 °C)
and reading point Sp3 is 73 °F (22.8 °C).
Fire tube boiler
6
1. Boiler casing - 2. ProRox ® insulation - 3. Cladding - 4. Flame tube - 5. Fire tube - 6. Reversing chamber
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