Knauf Insulation have developed Crown Pipe Insulation specifically for all types of small bore pipework

	Bright Class 'O' Facing
	Glass Mineral Wool

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 factory applied bright Class ‘O’ facing of reinforced aluminium foil with a self-adhesive overlap. Various finishes may be applied to meet individual 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 commonly recommended pipework finishes for a range of applications. Preformed pipe sections are available for copper and steel pipework from 15mm to 273mm 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, this should be carried out prior to the removal of the backing tape.

Stick down the self-adhesive overlap by removing the finger lift 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 pressure and smoothing down to achieve 100% contact area.

Cover butt circumferential joints with suitable, matching self-adhesive tape not less than 50mm wide. Normally, circumferential bands or wire ties should not be necessary. However, where this is deemed 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, with longitudinal overlaps of at least 25mm.

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

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 to low 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: 1990/2001.

The bright Class ‘O’ aluminium foil 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 table to the right.

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 when used with austenitic stainless steel
• Reduced thermal bridging
• No deterioration of performance over time
• Speed of installation

 

Form and dimensions

Crown Pipe Insulation is available as one-piece snap-on tubes, 1200mm long throughout the range.

 

 

 

 

 

 

 

 

 

 

 

 

 

Chilled and cold water supplies insulated to prevent surface condensation

 

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. The thicknesses are based on a low emissivity outer surface (ambient 25°C, 80% TH). Bright Class 'O' foil is a low emissivity surface.

 

Protection against freezing

O/d of steel pipe (mm)	Insulation thickness (mm)
	Indoor installation where freezing might occur	Outdoor installation within scope of BS 5422
27	25	40
34	25	25
42	25	25
48	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

 

Economic thickness to control heat loss

Recommended minimum thicknesses of insulation: Crown Pipe Insulation

Pipe Size			Insulation thickness (mm)
Bore	Outer diameter		Pipe content temperature
(mm)	(ins)	(mm)	100°C	200°C
15	½	21	40	50
20	¾	27	40	60
25	1	34	40	60
32	1¼	42	50	60
40	1½	48	50	80
50	2	60	50	80
65	2½	76	50	80
80	3	89	60	80
100	4	114	60	80
125	5	140	60	100
150	6	168	60	100
200	8	219	80	100
250	10	273	80	-

Note: These figures are derived from BS 5422: 1990. For other temperatures contact the Knauf Insulation Technical Advisory Centre.