Products
- Crown Pipe Insulation is a one-piece ‘snap-on’
pre-formed glass mineral wool section of 80 kg/m3 nominal density.
It is made from shot-free noncombustible glass mineral wool.
- Crown Pipe Insulation is faced with a bright
Class ‘O’ facing of reinforced aluminium foil with a self-adhesive
overlap. Various finishes may be applied to meet specification
requirements.
Typical Construction
Crown Pipe Insulation is suitable for the thermal and acoustic
insulation of:
- heating and hot water service pipes
- steam pipes up to 230ºC
- chilled water and cold water service pipes
The product selector sets out the
most common recommended pipework finishes for a range of
applications.
For minimum recommended thicknesses for the insulation of hot and
cold pipework refer to the table below.
Preformed pipe sections are available for copper and steel pipework
from 15mm to 100mm diameter.
Installation
Pre-formed sections of Crown Pipe
Insulation simply snap on. Ensure that all joints are well butted
together. Bends should be insulated with carefully mitred segments
of Crown Pipe Insulation - using mitre guide on packaging.
All fittings to be insulated to the same standard and finish as
adjacent pipework.
Crown Pipe Insulation
The insulation should only be
installed at ambient temperatures above 0°C and ideally when the
ambient temperature is at least 2°C higher than dew point.
The portion of the facing to which the overlap is stuck must be
clean, dry and free from condensation, dust, grease, oil and hand
creams.
When the product requires cutting
or shaping, carry this out prior to the removal of the backing
tape.
Facing must be installed with longitudinal overlaps of at least
25mm. Stick down the self-adhesive overlap by removing the backing
tape, peeling it away from one end and pressing down the overlap as
the adhesive is exposed. As the backing tape is removed, press the
exposed overlap adhesive into position in one simultaneous
movement.
Alternatively, remove the backing tape entirely and stick the
overlap down starting at the centre and working out to each end. In
all cases, stick down the overlap by applying the maximum amount of
pressure possible and smoothing down to achieve 100% contact
area.
Cover butt circumferential joints with suitable self-adhesive tape
not less than 50mm wide. Normally, circumferential bands or wire
ties should not be necessary. However, where this is felt
appropriate (i.e. extra support for large sections) they should be
installed at 450mm maximum centres and not nearer than 50mm to the
ends. Avoid over-tightening to prevent damage to the facing. Only
install bands or wire ties once the overlap has been stuck
down.
Install radiused bends using site-mitred segments and wire or band
into place. Use separate self-adhesive matching tape not less than
50mm wide at all joints.
The self adhesive overlap on Crown Pipe Insulation can be treated
as a conventional overlap and stuck down using separate matching
self-adhesive tape if desired.
Where the facing is to provide a vapour check, it is essential that
all joints are adequately sealed with adhesive or foil tape, and
any damage to the facing is repaired with tape or sealant.
Product Selector
| Application |
Temp. & Level |
Product |
Finish |
Specification
reference |
| Internal pipework (concealed or exposed to view) |
Hot pipes
at high level |
Crown Pipe
Insulation |
None |
P1 |
| Hot pipes
at low level |
Crown Pipe
Insulation |
Sheet
metal |
P3 |
| Cold pipes
at high level |
Crown Pipe
Insulation |
None |
P1 |
| Cold pipes
at low level |
Crown Pipe
Insulation |
Sheet
metal |
P3 |
| External pipework |
Hot pipes at high or low level |
Crown Pipe
Insulation |
PIB
sheeting |
P2 |
| Crown Pipe
Insulation |
Sheet
metal |
P3 |
| Cold pipes
at high or low level |
Crown Pipe
Insulation |
Sheet metal
or PIB sheeting |
P2 or
P3 |
| Boiler house and plant room |
Hot pipes
at high or low level |
Crown Pipe
Insulation |
Sheet
metal |
P3 |
| Cold pipes
at high or low level |
Crown Pipe
Insulation |
Sheet
metal |
P3 |
Note: Use of the alternative finishes is at the discretion
of the specifier and/or contractor.
Performance
Operating temperatures
Crown Pipe Insulation may be used on pipework at continuous
operating temperatures up to 230°C and may be used down to below
ambient temperatures provided that a 100% vapour barrier is
maintained. The surface temperature of the product should not
exceed 80°C.
Vapour and condensation
Crown Pipe Insulation will help to prevent condensation and
protect pipework from freezing when applied in thicknesses as
recommended in BS 5422:
2001.
The bright Class ‘O’ facing is classed as a vapour barrier and has
a vapour permeance of 0.00114 g/sMN.
| Mean temperature
(°C) |
Thermal conductivity
(W/mK) |
| 10 |
0.031 |
| 50 |
0.035 |
| 100 |
0.042 |
| 150 |
0.050 |
Note: Tested in accordance with BS 874: 1973 (1980)
Thermal performance
Crown Pipe Insulation has one of the lowest thermal
conductivities of any glass mineral wool and rock mineral wool pipe
section and complies with the requirements of the Building
Regulations for pipe insulation. The thermal conductivity varies
with temperature in accordance with the following table.
Fire performance
Crown Pipe Insulation base
glass mineral wool is non-combustible to BS 476: Part 4: 1970 (1984). The Class
‘O’ finish complies with the requirements of the Building
Regulations when tested to BS 476: Part 6: 1989 and Part 7:
1997.
Acoustic performance
Where there is a need to reduce radiated noise levels from
pipework, Crown Pipe Insulation provides effective control. The
actual performance varies with insulation thickness and surface
finish.
As an example, 100mm thickness of Crown Pipe Insulation under 20
swg mild steel gives an average reduction of over 31 dB and 50mm
thickness of insulation gives a reduction of 28 dB. Particular care
is required to seal joints and avoid bridging to achieve the best
results.
Other Advantages
- Corrosion free
- No thermal bridging
- No deterioration of performance over time
- Speed of installation
Crown Pipe Insulation is available
as one-piece snap-on tubes, 1200mm long throughout the range.
Environment thickness to control heat
loss
Recommended minimum thicknesses of insulation:
Crown Pipe Insulation
| Pipe
Size |
Insulation thickness (mm) |
| Bore |
Outer
diameter |
Hot water
services |
Heating
system pipework |
| (mm) |
(mm) |
60°C* |
75°C* |
100°C* |
150°C* |
| 10 |
17 |
20 |
20 |
20 |
25 |
| 15 |
21 |
20 |
20 |
25 |
30 |
| 20 |
27 |
25 |
25 |
25 |
30 |
| 25 |
34 |
25 |
25 |
30 |
40 |
| 32 |
42 |
25 |
25 |
30 |
40 |
| 40 |
48 |
30 |
30 |
30 |
40 |
| 50 |
60 |
30 |
30 |
40 |
40 |
| 65 |
76 |
30 |
30 |
40 |
40 |
| 80 |
89 |
30 |
40 |
40 |
50 |
| 100 |
114 |
40 |
40 |
40 |
50 |
| 125 |
140 |
40 |
40 |
40 |
50 |
| 150 |
168 |
40 |
40 |
50 |
- |
| 200 |
219 |
40 |
40 |
50 |
- |
| 250 |
273 |
40 |
40 |
50 |
- |
Note: *Water temperature. These figures are
derived from BS 5422: 2001. For other fuels contact the Knauf
Insulation Technical Advisory Centre.
Chilled and cold water supplies
| o/d of steel pipe
(mm) |
Insulation thickness (mm) |
| Temperature of
contents |
0°C |
5°C |
10°C |
| 21 |
30 |
25 |
20 |
| 34 |
40 |
25 |
20 |
| 60 |
40 |
30 |
25 |
| 114 |
50 |
40 |
30 |
| 168 |
- |
40 |
30 |
| 273 |
- |
50 |
40 |
Note: These figures are derived from BS 5422:
2001.
Protection against freezing
| o/d of copper
pipe |
Insulation thickness (mm) |
| |
Indoor installation
where freezing might occur |
Outdoor installation
within scope of BS 5422 |
| 22 |
25 |
- |
| 28 |
25 |
30 |
| 35 |
25 |
25 |
| 42 |
25 |
25 |
| 54 |
25 |
25 |
| 76 |
25 |
25 |
| 89 |
25 |
25 |
Notes:
1. Insulation alone will not prevent static water
in pipes from freezing; it will however delay the onset of
freezing. The table shows extracts from BS 5422: 1990.
2. The thicknesses are based on a low emissivity
outer surface (ambient 25ºC, 80% RH).
Bright Class ‘O’ foil is a low emissivity surface