Products
Crown Universal Slabs are
a range of semi-rigid to rigid, shot free, noncombustible, unfaced
glass mineral wool slabs. They are available in the following
densities:
- CS24 – 24 kg/m3
- CS32 – 32 kg/m3
- CS48 – 48 kg/m3
Crown Universal Slabs are available with a factory applied
bright Class 'O' aluminium facing applied to one side, subject to
enquiry.
Typical Construction
For cylinders up to 1120mm
diameter, Crown Universal Slab CS24 can be used. For diameters
between 1120mm and 3500mm diameter, Crown Universal Slab CS32 is
recommended. These slabs are sufficiently flexible for these
curvatures. For diameters over 3500mm, Crown Universal Slab of any
density can be used.
Note: Vessels operating at sub-ambient temperatures must have
an aluminium foiladequate continuous vapour seal applied over the
insulation and fixings.
Recommended thickness of insulation for hot water
cylinders and calorifiers
| Fuel Type |
Insulation
Thickness (mm) |
| Gas |
75 |
| Oil |
75 |
| Solid Fuel |
50 |
Note: These figures are derived from BS
5422: 1990.
Installation
Slabs are a range of The Crown
Universal Slabs may be fixed by means of metal bands, adhesive or a
combination of the two.
Cylindrical vessels
 |
Metal Cylinder |
 |
Crown Universal Slabs |
 |
Metal Bands |
Do not over-tension the metal
bands so as to significantly reduce the thickness of the
insulation. On vertical surfaces, circumferential support rings
should be fitted and spaced apart at distances to provide adequate
support to the insulation. applied to All joints must be well
butted together and vertical joints staggered on adjacent courses.
In multi-layer applications, all joints should be staggered.
The insulation may be fixed to domed ends by impaling over pins and
secured with spring washers or forked pins welded to the
vessel.
Rectangular vessels
| |
Crown Universal Slabs |
|
Pins fixed to the surface of the vessel |
Crown Universal Slabs shall be secured to the
surface with suitable adhesive. The adhesive to be applied to cover
the entire surface (it is important to follow the manufacturers
instructions).
Alternatively, the insulation may be impaled over pins fixed to the
surface of the vessel at the following pitches:
- Vertical surfaces at an approximate square pitch of 450mm
- Upward facing surfaces 600mm
- Overhanging or downward facing surfaces 300mm.
Location of pins should be arranged
so that there is a pin not more than 50mm from each corner of the
slab.
All joints should be closely butted together. Vertical joints (and
in multi-layer applications, all joints) must be staggered and at
corners, adjacent slabs must be overlapped to the thickness of the
insulation.
When using pins with spring clip washers the length of the pin to
be 10mm shorter than the thickness of the insulation to avoid hot
spots on the cladding. This is normally achieved by compressing the
mineral wool insulation with the spring washer by 10mm and cropping
the pin back to the washer.
Performance
Operating Temperatures
Crown Universal Slab can be used up
to continuous operating temperatures of temperatures provided that
a 100% vapour barrier is maintained. The surface temperature of the
facing (when faced with aluminium foil) should not exceed 80°C.
Fire Performance
The glass mineral wool of Crown
Universal Slab is classified as noncombustible to
BS
476: Part 4: 1970 (1984).
Thermal Performance
Crown Universal Slabs have variable
thermal conductivities depending on temperature, as shown in the
table below:
| Mean
Temperature |
Thermal
Conductivity (W/mK) |
| °C |
CS24 |
CS32 |
CS48 |
| 10 |
0.033 |
0.032 |
0.030 |
| 25 |
0.036 |
0.034 |
0.032 |
| 50 |
0.041 |
0.038 |
0.035 |
| 75 |
0.047 |
0.042 |
0.039 |
| 100 |
0.053 |
0.047 |
0.044 |
| 125 |
0.060 |
0.053 |
0.049 |
Note: Tested
in accordance with BS 874: 1973 (1980).
Vapour Resistance
Where Crown Universal Slab is faced
Operating with a Class vapour permeance of 0.00114g/s MN and is
defined as a vapour barrier to and down to low
BS
3533: 1981.
Acoustic Performance
Crown Universal Slab will provide
effective control of noise, the actual . performance varies with
insulation thickness and surface finish.
Other Advantages
- Combines lightness, strength and ease of use
- Corrosion free when used with ambient austenitic stainless
steel
- No deterioration of performance over time
- Resilient, strong and flexible
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