Thickness of insulationIN ACCORDANCE WITH

BS5422:2009

ProRoxIndustrial insulation

EDITION: UK - PUBLISHED 10/2013

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Excellence in technical insulationsolutions ROCKWOOL® Technical Insulation (RTI) – a subsidiary of the ROCKWOOL Group – develops innovative technical insulation solutions for the process industry and the shipbuilding & offshore market. Through our comprehensive product range we offer a full spread of products and systems guaranteeing the highest possible thermal and firesafe insulation of all technical installations. Our +75 years of experience are reflected in a complete set of high-grade products and expert advice. Today, we remain fully committed to providing the very best service in the market and a total range of cutting-edge insulation solutions.

Your highest quality is our minimum demand All ROCKWOOL Technical Insulation solutions meet the most stringent quality and safety standards. All products and constructions have been tested according to the latest regulations and approved by all major classification societies. As an innovation-driven company we demand excellence. In every segment we keep searching for new systems, methods and solutions. We endeavour to develop ever more efficient products and to constantly optimise production processes and processing technologies.

Up-to-date information? Wherever, whenever? We can help! As a highly skilled professional you are always looking for the best possible end result. The quickest way to achieve that is with ROCKWOOL Technical Insulation premium products and the detailed information that comes with them, which always incorporates the latest technical findings. That’s why you should always check that the information you have is up-to-date. If you have any questions about a specific application or a product characteristic, contact us on +44 (0)871 222 1780 or technical.solutions@rockwool.co.uk. You can also visit our web site at www.rockwool-rti.com

Premium member of EIIF ROCKWOOL Technical Insulation was one of the founding partners of the European Industrial Insulation Foundation (EIIF), which has established itself as a resource for industries that need to reduce CO² emissions.

European IndustrialInsulation Foundation

Founding Partner

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The best solutions, built on solid expertise In addition to providing outstanding products, ROCKWOOL Technical Insulation is able to draw on in-depth expertise to ensure that end users in the petrochemicals, power generation, shipbuilding, offshore and the process industries are given the best and most advanced insulation solution. Both in the process industry and in the marine & offshore industry, our stone wool products offer the best possible protection against heat and energy loss, fire, noise and other unwanted influences. Our sales teams will be delighted to advise you in drawing up technical and project specifications.

Our people, your profit The key to our success is the combination of excellent insulation products and outstanding people who know exactly what they are talking about. Thanks to their expertise and extensive experience, we can offer exceptional stone wool solutions and impeccable service. With technical support on a high level we are prepared to help you to choose the optimal solutions and secure the necessary documentation.

Part of the ROCKWOOL Group ROCKWOOL Technical Insulation is a subsidiary of the ROCKWOOL Group, the world’s largest producer of stone wool products. ROCKWOOL International A/S is based in Hedehusene, Denmark. The parent company has net turnover of around € 1.97 billion in 2012. ROCKWOOL International has 27 factories in Europe, North America and Asia, and has around 9,700 employees.

ROCKWOOL has a melting point above 1000°C ROCKWOOL products withstand temperatures up to 1000°C, making them exceptionally resistant to fire. This resistance can slow a fire’s progress and buy precious time for rescue operations while helping to protect the building’s structure from unnecessary damage. Yet while heat and flames are bad enough in a fire, smoke is the serious danger. It can suffocateoccupants, and it can incapacitate people who might otherwise have been able to escape. ROCKWOOL insulation keeps toxic smoke from insulation to a minimum for even greater safety.

Stone wool protects people and the environment ROCKWOOL products offer effective protection and optimal performance for the entire life cycle of the installation. According to independent research ROCKWOOL is one of the most durable products available with an unequalled combination in the field of environmental improvement, energy savings, CO2 reduction, acoustic insulation and fire safety. A positive ‘carbon footprint’: During its entire life cycle, ROCKWOOL insulation will save more than 20,000 times the carbon emissions caused by its production. The fire retardant and fire insulating characteristics of our stone wool products deliver superior protection to people, property and the environment.

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New product names, logical structureEach product name is structured in the same clear way:

e.g.: ProRox PSM 660 ALU UK

Product range 2 last digits = other product characteristics

Product identifier PS = Pipe SectionsSB = Segmented BendsPSM = Pipe Section MatWM = Wired MatsQM = Quilt MatsSL = SlabsGR = Granulated Loose Fill

Application code1st digit: 6 = fire protection, 9 = thermal insulation

Product variants ALU = reinforced aluminium

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ProRoxIndustrial insulation

In the view of our rebranding strategy we have adapted and clarified the entire range of ROCKWOOL Technical Insulation products. From now on, all our insulation solutions for technical installations in the process industry will be part of the ProRox range. The main characteristic of these products is their high thermal insulation capacity. Next to this, they of course also comply with the most stringent requirements on fire resistance and acoustic insulation. Below you will get an overview of the ProRox range and its new names.

NEW NAME OLD NAME THERMAL INSULATIONProRox PS 971UK Process Pipe Section ProRox SB 971UK Pipe Bend segments ProRox PSM 971 ALUUK Pipe Section Mat ProRox WM 960UK Industrial Wired Mat ProRox WM 970UK HD Wired Mat ProRox QM 960UK LD Insulation Quilt ProRox QM 970UK HD Insulation Quilt ProRox SL 920UK RWA45 ProRox SL 930UK RW3 ProRox SL 950UK RW4 ProRox SL 960UK RW5 ProRox SL 980UK RW6 ProRox GR 900UK Industrial Hand Fill

HYDROCARBON FIRE PROTECTIONProRox PS 661UK Hydrocarbon Pipe Section ProRox PSM 660 ALUUK Hydrocarbon Pipe Section Mat ProRox SL 660UK Hydrocarbon Slab ProRox WM 660 SWUK Hydrocarbon Wired Mat

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BS 5422:2009AN EXPLANATORY NOTEMethod for specifying thermal insulating materials for pipes, tanks, vessels, ductwork and equipment operating within the temperature range -40°C to +700°C

BS 5422 is arguably the most important industry-wide standard for determining and specifying the requirements for thermal insulation used on pipe-work and equipment.

ROCKWOOL does not thermally age and therefore the thicknesses shown can be relied upon to provide the required insulation performance for the lifetime of the host structure.

BS 5422 is not a prescriptive document and recognises that there are many reasons why the insulation of pipes, tanks, vessels, ductwork and equipment may be required. It is therefore important that specifiers state the criteria or specific clause or reference in this standard in any specification.

Insulation thicknesses are given for a range of thermal conductivities appropriate to the usual materials used for the application; thicknesses for intermediate thermal conductivities and pipe sizes may be deduced by calculation or interpolation. For guidance in selecting appropriate types of insulation and suitable methods of application, reference should be made to BS 5970.

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Surface emissivity (ε) table

Material Emissivity (ε)

Aluminium, bright 0.05

Aluminium, oxidized 0.13

Aluminium foil, bright reinforced 0.05

Aluminium foil, polyester faced reinforced 0.40

Alu-zinc 0.18

Austenitic steel 0.15

Brass, dull tarnished 0.61

Brass, unoxidized 0.035

Cast iron (and iron) 0.35

Cast iron, rusted and oxidized 0.65

Chrome, polished 0.10

Cloth 0.90

Copper, commercial scoured to a shine 0.07

Copper, oxidized 0.70

Copper, polished 0.02

Fire brick 0.75

Galvanised steel, blank 0.26

Galvanised steel, dusty 0.44

Paint, black 0.95

Paint, other colours 0.90

Paint, white 0.85

Paint, aluminium weathered 0.55

Paint, aluminium new 0.30

Roofing felt 0.94

Rubber black 0.95

Rubber, grey 0.85

Steel 0.35

Steel, black painted 0.90

Steel, oxidized 0.80

White lacquer 0.95

NOTE 1 The above values provide a useful guide to surface emissivity. However, it should be noted that the emissivity of a material varies with temperature and surface finishes. Therefore, the precise emissivity should be ascertained where a high degree of accuracy is required.

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Surface Emissivity

Emissivity is defined as the ratio of the energy radiated from a material’s surface to that radiated from a blackbody (a perfect emitter) under the same conditions. It is a dimensionless number between 0 (for a perfect reflector) and 1 (for a perfect emitter). The emissivity of a surface depends not only on the material but also on the nature of the surface. For example, a clean and polished metal surface will have a low emissivity, whereas a roughened and oxidised metal surface will have a high emissivity. The emissivity also depends on the temperature of the surface.

Knowledge of surface emissivity is important for accurate heat transfer calculations.

So what does this mean to me?Low emissivity surfaces (e.g. aluminium, stainless steel etc.) produce a higher surface temperature but lower heat loss than high emissivity surfaces (e.g. painted steel, cloth etc.) when compared at the same operating conditions and insulation thickness.

A 273 mm O.D. steam pipe running at 200OC insulated with 120 mm thick ProRox PS 971UK pipe section:

Cladding Type Emissivity (ε) Outer Surface Temp (°C)

Heat Loss(W/m)

Aluminium 0.05 25.9 82.8

Cloth 0.90 17.3 85.7

Based on ambient temperature 10°C (still air), horizontal pipe.

For personnel protection applications, high emissivity claddings are best.For heat conservation, low emissivity claddings are best.

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ROCKWOOL Technical Insulation offers a full technical advice service to assist the appropriate selection of products, their correct application and to discuss any special considerations necessary at the design stage to ensure trouble free installation and use.

Customer Support: 0871 222 1780www.rockwool-rti.com

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GUIDE TO TABLES

BS5422table

Table reference Page No

6 Minimum insulation thickness for chilled and cold water steel pipes to control condensation on a high emissivity outer surface (0.9) with an ambient temperature of +25°C and a relative humidity of 80 % 10

8 Minimum insulation thickness for chilled and cold water steel pipes to control condensation on a low emissivity outer surface (0.05) with an ambient temperature of +25°C and a relative humidity of 80 % 11

10 Indicative thickness of insulation for cooled and chilled water systems to control heat gain - Low emissivity outer surfaces 12

11 Indicative thickness of insulation for cooled and chilled water systems to control heat gain - High emissivity outer surfaces 13

21 Minimum insulation thickness for process pipework and equipment to control heat loss 14

22 Minimum insulation thickness to control the surface temperature of a non-metallic surface with a surface emissivity of 0.90 and design cold face temperature of 59°C 15

23 Minimum insulation thickness to control the surface temperature of a metallic surface with a surface emissivity of 0.05 and design cold face temperature of 50°C 16

24 Minimum insulation thickness to control the surface temperature of a non-metallic surface with a surface emissivity of 0.90 and design cold face temperature of 50°C 17

Minimum insulation thickness to control the surface temperature of a metallic surface with a surface emissivity of 0.05 and design cold face temperature of 55ºC 18

Minimum insulation thickness to control the surface temperature of a metallic surface with a surface emissivity of 0.18 and design cold face temperature of 55ºC 19

Minimum insulation thickness to control the surface temperature of a metallic surface with a surface emissivity of 0.26 and design cold face temperature of 55ºC 20

25 Heat loss from bare surfaces calculated in accordance with BS EN ISO 12241:1998 (black steel pipes) 21

28 Minimum insulation thickness to protect steel pipes against freezing – Selected industrial process conditions 22

If the design/operating conditions of your particular application/scheme does not correspond to those detailed in the tables, please contact ROCKWOOL Technical Insulation for calculations to meet your specific design criteria.

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Outside diameter of steel pipe on which insulation has been

based (mm)

Temperature of contents (°C)

+10 +5 0

Thickness of ROCKWOOL ProRox PS 971 (mm)

17.2 9 (20) 12 (20) 15 (20)

21.3 10 (20) 13 (20) 16 (20)

26.9 10 (20) 14 (20) 17 (20)

33.7 11 (20) 14 (20) 18 (20)

42.4 11 (20) 15 (20) 19 (20)

48.3 12 (20) 16 (20) 20 (20)

60.3 12 (20) 16 (20) 21 (25)

76.1 12 (25) 17 (25) 21 (25)

88.9 13 (25) 18 (25) 22 (25)

101.6 13 (25) 18 (25) 23 (25)

114.3 13 (25) 18 (25) 23 (25)

139.7 14 (25) 19 (25) 24 (25)

168.3 14 (25) 19 (25) 25 (25)

219.1 14 (25) 20 (25) 26 (30)

244.5 15 (25) 20 (25) 26 (30)

273.0 15 (25) 21 (25) 26 (30)

323.9 15 (25) 21 (25) 27 (30)

355.6 15 (30) 21 (30) 27 (30)

406.4 15 (40) 22 (40) 28 (40)

457.0 16 (40) 22 (40) 28 (40)

508.0 16 (40) 22 (40) 28 (40)

610.0 16 (40) 23 (40) 29 (40)

NOTE 1 Thicknesses given are calculated specifically against the criteria noted in the table. These thicknesses may not satisfy other design requirements. In situations where the ambient air temperature is greater than 25ºC and/or the relative humidity exceeds 80%, these thicknesses will not be sufficient to control condensation.

NOTE 2 Advised thicknesses of ROCKWOOL insulation are shown in brackets.

NOTE 3 These thicknesses only apply where the vapour barrier has a dark, matt finish.

Table 6 (BS5422:2009)Minimum insulation thickness for chilled and cold water steel pipes to control condensation on a high emissivity outer surface (0.9) with an ambient temperature of +25°C and a relative humidity of 80 %

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Outside diameter of steel pipe on which insulation has been

based (mm)

Temperature of contents (°C)

+10 +5 0

Thickness of ROCKWOOL ProRox PS 971 ALU (mm)

17.2 18 (20) 25 (25) 31 (40)

21.3 19 (20) 26 (30) 33 (40)

26.9 21 (25) 29 (30) 36 (40)

33.7 22 (25) 30 (30) 38 (40)

42.4 24 (25) 33 (40) 41 (50)

48.3 25 (25) 34 (40) 43 (50)

60.3 26 (30) 36 (40) 46 (50)

76.1 28 (30) 39 (40) 49 (50)

88.9 30 (30) 41 (50) 52 (60)

101.6 31 (40) 43 (50) 54 (60)

114.3 32 (40) 44 (50) 56 (60)

139.7 34 (40) 47 (50) 59 (60)

168.3 35 (40) 49 (50) 63 (70)

219.1 38 (40) 53 (60) 68 (70)

244.5 39 (40) 55 (60) 70 (70)

273.0 40 (40) 56 (60) 72 (80)

323.9 42 (50) 59 (60) 75 (80)

355.6 43 (50) 61 (70) 77 (80)

406.4 45 (50) 63 (70) 80 (80)

457.0 46 (50) 65 (70) 83 (90)

508.0 47 (50) 66 (70) 85 (90)

610.0 49 (50) 70 (70) 89 (90)

NOTE 1 Thicknesses given are calculated specifically against the criteria noted in the table. These thicknesses may not satisfy other design requirements. In situations where the ambient air temperature is greater than 25ºC and/or the relative humidity exceeds 80%, these thicknesses will not be sufficient to control condensation.

NOTE 2 Advised thicknesses of ROCKWOOL insulation are shown in brackets.

Table 8 (BS5422:2009) Minimum insulation thickness for chilled and cold water steel pipes to control condensation on a low emissivity outer surface (0.05) with an ambient temperature of +25°C and a relative humidity of 80%

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Table 10 (BS5422:2009) Indicative thickness of insulation for cooled and chilled water systems to control heat gain - Low emissivity outer surfaces (ε = 0.05)

Outside diameter of steel pipe on which insulation has been

based (mm)

Temperature of contents (°C)

+10 +5 0

Thickness of ROCK-

WOOL ProRox PS

971 ALU (mm)

Heat Gain (W/m)

Thickness of ROCK-

WOOL ProRox PS

971 ALU (mm)

Heat Gain (W/m)

Thickness of ROCK-

WOOL ProRox PS

971 ALU (mm)

Heat Gain (W/m)

17.2 16 (20) 2.48 22 (25) 2.97 27 (30) 3.4721.3 17 (20) 2.72 23 (25) 3.27 28 (30) 3.8126.9 18 (20) 3.05 25 (25) 3.58 30 (30) 4.18

33.7 19 (20) 3.41 26 (30) 4.01 32 (40) 4.60

42.4 20 (20) 3.86 27 (30) 4.53 34 (40) 5.1148.3 21 (25) 4.11 28 (30) 4.82 35 (40) 5.4560.3 21 (25) 4.78 29 (30) 5.48 36 (40) 6.1776.1 22 (25) 5.51 30 (30) 6.30 37 (40) 6.7088.9 22 (25) 6.17 31 (40) 6.90 38 (40) 7.77

114.3 23 (25) 7.28 31 (40) 8.31 39 (40) 9.15139.7 23 (25) 8.52 32 (40) 9.49 40 (40) 10.45168.3 23 (25) 9.89 32 (40) 10.97 41 (50) 11.86219.1 23 (25) 12.27 32 (40) 13.57 41 (50) 14.61273.0 24 (25) 14.74 32 (40) 16.28 41 (50) 17.48

NOTE 1 Insulation thicknesses in this table have been calculated according to BS EN ISO 12241:2008 using standardized assumptions: horizontal pipe in still air at 25ºC, emissivity of outer surface of insulated system as specified.

NOTE 2 Thicknesses derived solely against the criteria noted in this table may not necessarily satisfy other design requirements such as control of condensation.

NOTE 3 Heat gain relates to the specified thickness and temperature.

NOTE 4 Advised thicknesses of ROCKWOOL insulation are shown in brackets.

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Table 11 (BS5422:2009) Indicative thickness of insulation for cooled and chilled water systems to control heat gain - High emissivity outer surfaces (ε = 0.9)

Outside diameter of steel pipe on which insulation has been

based (mm)

Temperature of contents (°C)

+10 +5 0

Thickness of ROCK-

WOOL ProRox PS

971(mm)

Heat Gain (W/m)

Thickness of ROCK-

WOOL ProRox PS

971(mm)

Heat Gain (W/m)

Thickness of ROCK-

WOOL ProRox PS

971(mm)

Heat Gain (W/m)

17.2 23 (25) 2.48 29 (30) 2.97 33 (40) 3.4721.3 24 (25) 2.72 30 (30) 3.27 34 (40) 3.8126.9 25 (25) 3.05 32 (40) 3.58 37 (40) 4.18

33.7 26 (30) 3.41 33 (40) 4.01 39 (40) 4.60

42.4 27 (30) 3.86 34 (40) 4.53 41 (50) 5.1148.3 28 (30) 4.11 35 (40) 4.82 42 (50) 5.4560.3 29 (30) 4.78 36 (40) 5.48 43 (50) 6.1776.1 30 (30) 5.51 38 (40) 6.30 44 (50) 6.7088.9 30 (30) 6.17 39 (40) 6.90 45 (50) 7.77

114.3 31 (40) 7.28 39 (40) 8.31 47 (50) 9.15139.7 31 (40) 8.52 40 (40) 9.49 48 (50) 10.45168.3 32 (40) 9.89 40 (40) 10.97 49 (50) 11.86219.1 32 (40) 12.27 41 (50) 13.57 49 (50) 14.61273.0 32 (40) 14.74 41 (50) 16.28 50 (50) 17.48

NOTE 1 Insulation thicknesses in this table have been calculated according to BS EN ISO 12241:2008 using standardized assumptions: horizontal pipe in still air at 25ºC, emissivity of outer surface of insulated system as specified.

NOTE 2 Thicknesses derived solely against the criteria noted in this table may not necessarily satisfy other design requirements such as control of condensation.

NOTE 3 Heat gain relates to the specified thickness and temperature.

NOTE 4 Advised thicknesses of ROCKWOOL insulation are shown in brackets.

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Diameter of steelpipe on which

insulation thicknesshas been based

(mm)

Hot face temperature (°C)

100 200 300 400 500 600

Insthk

(mm)

Heatloss

(W/m)

Insthk

(mm)

Heatloss

(W/m)

Insthk

(mm)

Heatloss

(W/m)

Insthk

(mm)

Heatloss

(W/m)

Insthk

(mm)

Heatloss

(W/m)

Insthk

(mm)

Heatloss

(W/m)

17.2 30 12.8 42 28.7 55 47.1 71 69.1 88 96.1 112 126.9

21.3 32 14.0 45 30.7 58 50.5 74 74.1 91 103.0 116 135.4

26.9 34 15.4 47 33.7 61 55.0 78 80.1 96 110.7 121 145.6

33.7 34 17.3 49 37.1 64 59.9 81 87.2 99 119.8 126 156.8

42.4 36 19.2 52 40.8 67 65.8 85 95.1 104 130.6 131 170.0

48.3 37 20.4 53 43.4 69 69.4 88 99.7 107 137.0 134 178.3

60.3 38 23.2 55 48.4 72 76.7 91 109.9 112 149.3 140 194.3

76.1 40 26.2 58 54.2 76 85.1 96 121.2 118 164.6 145 213.2

88.9 41 28.7 60 58.7 78 92.0 99 130.2 121 176.7 149 227.7

114.3 42 33.9 63 67.3 82 104.6 104 146.8 127 198.2 156 254.2

139.7 43 38.7 65 75.7 85 116.6 107 163.6 132 218.2 161 279.8

168.3 44 44.0 67 84.9 89 129.5 112 180.4 136 240.5 168 305.5

219.1 45 53.4 69 101.2 92 152.7 117 209.6 142 277.8 175 351.0

273.0 46 62.9 71 117.6 95 175.7 121 239.4 148 315.4 188 386.9

NOTE 1 Insulation thicknesses in this table have been calculated according to BS EN ISO 12241:2008 using standardized assumptions: horizontal pipe in still air at 15°C. Surface emissivity corresponding to outer surface specified.

NOTE 2 Maximum heat loss values for intermediate operating temperatures may be deduced by interpolation.

NOTE 3 Heat loss measured in Watts per metre (W/m) relates to the specified thickness and temperature.

NOTE 4 The thermal conductivity of insulation materials increases with mean temperature and for any given material. The use of a different thermal conductivity can be required for each operating temperature.

NOTE 5 These thicknesses may not satisfy other design requirements, in particular those for control of surface temperature (see Table 22, Table 23 and Table 24).

Table 21 (BS5422:2009)Minimum insulation thickness for process pipework and equipment to control heat loss (ProRox PS 971)

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Outside diameter of steel

pipe (mm)

Surface emissivity 0.90

(e.g. black paint)

Non metallicsurface

Design coldface 59°C

Hot face temperature °C (with ambient still air at +20°C)100 200 300 400 500 600

Thickness of ROCKWOOL ProRox PS 971 (mm)

17.2 3 10 18 27 38 5221.3 3 11 19 29 41 5526.9 4 11 20 31 43 5933.7 4 12 21 32 46 6242.4 4 12 22 34 49 6648.3 4 13 23 35 50 6960.3 4 13 24 37 53 7376.1 4 14 25 40 57 7788.9 4 14 26 41 59 80

101.6 4 15 27 42 61 83114.3 4 15 28 43 63 85139.7 4 15 29 45 66 90168.3 5 16 30 47 68 94219.1 5 16 31 50 72 100244.5 5 17 32 51 74 102273.0 5 17 32 52 76 105323.9 5 17 33 53 78 108355.6 5 17 34 54 80 111406.4 5 18 34 55 82 113457.0 5 18 35 56 83 113508.0 5 18 35 57 83 113610.0 5 18 35 57 83 113

NOTE 1 Insulation thicknesses in this table have been calculated according to BS EN ISO 12241:2008 using standardized assumptions: horizontal pipe in still air at 20°C. Surface emissivity corresponding to outer surface specified.

NOTE 2 Maximum heat loss values for intermediate operating temperatures may be deduced by interpolation.

NOTE 3 Heat loss measured in Watts per metre (W/m) relates to the specified thickness and temperature.

NOTE 4 The thermal conductivity of insulation materials increases with mean temperature and for any given material. The use of a different thermal conductivity can be required for each operating temperature.

NOTE 5 These thicknesses may not satisfy other design requirements, in particular those for control of surface temperature (see Table 22, Table 23 and Table 24).

NOTE 6 To simplify the use of this table the values shaded have been adjusted to avoid the specification of apparently anomalous results given by the calculation method in BS EN ISO 12241, due to the transition from turbulent to laminar flow.

Table 22 (BS5422:2009) Minimum insulation thickness to control the surface temperature of a non-metallic surface with a surface emissivity of 0.90 and design cold face temperature of 59°C

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Outside diameter of steel

pipe (mm)

Surface emissivity 0.05

(e.g. bright aluminium foil)

Metallicsurface

Design coldface 50°C

Hot face temperature °C (with ambient still air at +20°C)100 200 300 400 500 600

Thickness of ROCKWOOL ProRox PS 971 (mm)

17.2 8 23 42 66 103 13721.3 8 24 44 70 111 14526.9 9 26 48 76 118 15633.7 9 28 51 80 126 16542.4 10 30 55 86 131 17748.3 10 32 57 90 141 18460.3 11 34 61 96 151 19676.1 12 36 66 104 159 21188.9 12 38 69 109 166 221

101.6 13 40 72 114 171 230114.3 13 41 75 118 183 238139.7 14 43 80 125 194 254168.3 15 46 85 133 210 254219.1 15 49 91 144 217 254244.5 16 51 94 149 217 260273.0 16 53 98 154 217 266323.9 17 55 103 162 217 276355.6 17 56 105 167 217 281406.4 18 58 109 167 217 289457.0 18 60 113 167 219 296508.0 19 62 113 167 223 302610.0 20 64 113 167 230 312

NOTE 1 Insulation thicknesses in this table have been calculated according to BS EN ISO 12241:2008 using standardized assumptions: horizontal pipe in still air at 20 °C. Surface emissivity corresponding to outer surface specified.

NOTE 2 The thermal conductivity of insulation materials increases with mean temperature and for any given material. The use of a different thermal conductivity can be required for each operating temperature.

NOTE 3 To simplify the use of this table the values shaded have been adjusted to avoid the specification of apparently anomalous results given by the calculation method in BS EN ISO 12241, due to the transition from turbulent to laminar flow.

Table 23 (BS5422:2009) Minimum insulation thickness to control the surface temperature of a metallic surface with a surface emissivity of 0.05 and design cold face temperature of 50°C

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Table 24 (BS5422:2009) Minimum insulation thickness to control the surface temperature of a non-metallic surface with a surface emissivity of 0.90 and design cold face temperature of 50°C

Outside diameter of steel

pipe (mm)

Surface emissivity 0.90

(e.g. black paint)

Metallicsurface

Design coldface 50°C

Hot face temperature °C (with ambient still air at +20°C)100 200 300 400 500 600

Thickness of ROCKWOOL ProRox PS 971 (mm)

17.2 5 13 23 35 50 6821.3 5 14 25 37 53 7226.9 5 15 26 40 57 7733.7 6 16 28 42 60 8142.4 6 17 30 45 64 8648.3 6 17 30 46 66 8960.3 6 18 32 49 70 9476.1 6 19 34 52 74 10088.9 6 20 35 54 77 104

101.6 7 20 36 56 80 108114.3 7 21 37 57 82 111139.7 7 21 39 60 86 117168.3 7 22 40 63 90 122219.1 7 23 42 66 95 130244.5 7 23 43 68 98 134273.0 7 24 44 71 100 137323.9 8 24 45 73 104 142355.6 8 25 46 74 106 145406.4 8 25 47 76 108 145457.0 8 25 48 77 111 147508.0 8 26 48 77 111 149610.0 8 26 49 77 111 151

NOTE 1 Insulation thicknesses in this table have been calculated according to BS EN ISO 12241:2008 using standardized assumptions: horizontal pipe in still air at 20°C. Surface emissivity corresponding to outer surface specified.

NOTE 2 The thermal conductivity of insulation materials increases with mean tempera-ture and for any given material. The use of a different thermal conductivity can be required for each operating temperature.

NOTE 3 To simplify the use of this table the values shaded have been adjusted to avoid the specification of apparently anomalous results given by the calculation method in BS EN ISO 12241, due to the transition from turbulent to laminar flow.

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Minimum insulation thickness to control the surface temperature of a metallic surface with a surface emissivity of 0.05 and design cold face temperature of 55ºC

Outside diameter of steel

pipe (mm)

Surface emissivity 0.05

(e.g. bright aluminium foil)

Metallicsurface

Design coldface 55°C

Hot face temperature °C (with ambient still air at +20°C)100 200 300 400 500 600

Thickness of ROCKWOOL ProRox PS 971 (mm)

17.2 6 19 35 55 81 11421.3 6 20 37 59 86 12126.9 7 22 40 63 93 13033.7 7 23 43 67 99 13842.4 8 25 46 72 106 14848.3 8 26 48 75 110 15460.3 9 28 51 81 118 16576.1 9 30 55 87 127 17788.9 9 31 58 91 134 186

101.6 10 33 60 95 139 194114.3 10 34 63 99 144 201139.7 11 36 67 105 154 214168.3 11 38 70 112 163 227219.1 12 40 76 121 177 227244.5 12 42 79 125 183 227273.0 12 43 81 129 189 227323.9 13 45 85 136 217 235355.6 13 46 87 140 217 239406.4 14 48 91 140 217 245457.0 14 49 94 140 217 251508.0 14 51 94 140 191 256610.0 15 51 94 140 194 264

NOTE 1 Thicknesses given are calculated specifically against the criteria noted in the table. Adopting these thicknesses may not necessarily satisfy other design requirements.

NOTE 2 To simplify the use of this table the values shaded have been adjusted to avoid the specification of apparently anomalous results given by the calculation method in BS EN ISO 12241, due to the transition from turbulent to laminar flow.

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Minimum insulation thickness to control the surface temperature of a metallic surface with a surface emissivity of 0.18 and design cold face temperature of 55ºC

Outside diameter of steel

pipe (mm)

Surface emissivity 0.18

(e.g. alu-zinc cladding)

Metallicsurface

Design coldface 55°C

Hot face temperature °C (with ambient still air at +20°C)100 200 300 400 500 600

Thickness of ROCKWOOL ProRox PS 971 (mm)

17.2 6 17 31 48 70 9821.3 6 18 33 51 74 10426.9 6 19 35 55 80 11133.7 7 21 37 58 85 11742.4 7 22 40 63 91 12648.3 7 23 42 65 95 13160.3 8 24 45 70 101 13976.1 8 26 48 75 108 14988.9 8 27 50 78 113 156

101.6 9 28 52 82 118 163114.3 9 29 54 84 122 168139.7 9 31 57 89 130 179168.3 10 32 60 94 137 189219.1 10 34 64 101 147 203244.5 10 35 66 104 152 203273.0 10 36 68 108 157 203323.9 11 37 71 113 164 203355.6 11 38 72 116 164 206406.4 11 39 75 120 164 211457.0 12 40 77 120 164 215508.0 12 41 77 120 164 219610.0 12 42 77 120 165 226

NOTE 1 Thicknesses given are calculated specifically against the criteria noted in the table. Adopting these thicknesses may not necessarily satisfy other design requirements.

NOTE 2 To simplify the use of this table the values shaded have been adjusted to avoid the specification of apparently anomalous results given by the calculation method in BS EN ISO 12241, due to the transition from turbulent to laminar flow.

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Minimum insulation thickness to control the surface temperature of a metallic surface with a surface emissivity of 0.26 and design cold face temperature of 55ºC

Outside diameter of steel

pipe (mm)

Surface emissivity 0.26 (e.g. new

galvanised cladding)

Metallicsurface

Design coldface 55°C

Hot face temperature °C (with ambient still air at +20°C)100 200 300 400 500 600

Thickness of ROCKWOOL ProRox PS 971 (mm)

17.2 5 16 29 45 65 9021.3 6 17 31 48 69 9526.9 6 18 33 51 74 10233.7 6 19 35 54 78 10842.4 7 21 37 58 84 11648.3 7 21 39 61 87 12060.3 7 23 41 65 93 12876.1 7 24 44 69 100 13788.9 8 25 46 72 104 143

101.6 8 26 48 75 108 149114.3 8 27 49 77 112 154139.7 8 28 52 82 119 163168.3 9 29 55 86 125 172219.1 9 31 59 92 134 185244.5 9 32 60 95 138 191273.0 10 33 62 98 143 191323.9 10 34 64 102 149 191355.6 10 35 66 105 149 191406.4 10 36 68 108 149 194457.0 10 37 70 108 149 198508.0 11 37 71 108 149 202610.0 11 38 71 108 152 208

NOTE 1 Thicknesses given are calculated specifically against the criteria noted in the table.Adopting these thicknesses may not necessarily satisfy other design requirements.

NOTE 2 To simplify the use of this table the values shaded have been adjusted to avoid the specification of apparently anomalous results given by the calculation method in BS EN ISO 12241, due to the transition from turbulent to laminar flow.

21

Outside diameter of steel

pipe (mm)

Operating temperature (°C)

50 100 150 200 250 300 350 400 450 500 550 600 650 700

Heat loss (W/m pipes, W/m2 flat)

12.0 17 57 110 176 257 356 476 620 791 993 1231 1509 1832 2206

15.0 20 69 133 214 313 435 582 758 969 1220 1514 1859 2260 2723

17.2 23 78 150 241 353 491 658 859 1099 1384 1720 2113 2571 3100

21.3 27 93 180 290 427 594 798 1043 1337 1687 2099 2583 3146 3798

22.0 28 96 186 299 439 611 821 1074 1378 1738 2164 2662 3243 3916

26.9 33 114 221 356 525 732 985 1291 1658 2095 2611 3217 3923 4742

28.0 35 118 229 369 544 759 1022 1340 1721 2175 2711 3341 4075 4926

33.7 41 139 269 435 641 897 1209 1588 2042 2585 3226 3979 4859 5878

42.0 49 168 326 528 781 1094 1478 1944 2505 3175 3968 4901 5990 7254

42.4 50 169 329 532 788 1104 1491 1961 2527 3203 4004 4945 6045 7320

48.3 56 190 369 598 885 1242 1679 2212 2853 3619 4527 5595 6843 8292

54.0 61 209 407 660 979 1374 1860 2452 3165 4018 5029 6220 7612 9228

60.3 68 230 448 728 1081 1519 2058 2715 3508 4456 5582 6908 8458 10258

67.0 74 253 492 800 1188 1672 2268 2994 3871 4921 6167 7636 9354 11350

76.1 83 283 551 896 1333 1878 2550 3370 4360 5548 6958 8621 10566 12827

80.0 87 295 576 938 1395 1966 2670 3530 4569 5815 7296 9041 11084 13459

88.9 95 324 632 1031 1535 2165 2943 3894 5044 6424 8064 9998 12263 14897

101.6 107 365 712 1162 1733 2447 3330 4410 5718 7287 9155 11358 13940 16942

108.0 113 385 752 1228 1832 2588 3523 4668 6056 7721 9703 12042 14782 17969

114.3 119 405 791 1292 1929 2726 3714 4922 6387 8147 10241 12713 15609 18979

139.7 142 484 947 1549 2316 3279 4474 5939 7716 9853 12399 15406 18932 23036

168.3 167 571 1119 1833 2746 3894 5321 7072 9200 11760 14812 18420 22653 27582

219.1 212 722 1419 2330 3498 4971 6806 9063 11809 15117 19065 23736 29220 35609

273.0 258 880 1731 2848 4283 6098 8362 11152 14550 18647 24221 30135 37067 45134

323.9 301 1027 2021 3331 5016 7151 10254 13667 17813 22798 28737 35754 43978 53549

flat 285 1212 2405 3949 5897 8317 11286 14890 19226 24396 30515 37700 46081 55794

Operating conditions:

Ambient still air temperature: 20°C Surface emissivity: 0.90 Height of flat surfaces: 0.6m Surface orientation: horizontal

Table 25 (BS5422:2009)Heat loss from bare surfaces calculated in accordance with BS EN ISO 12241:1998 (black steel pipes)

22

Outside diameter of pipe (mm)

Inside diameter [bore] (mm)

Initial water temperature: +5°C Initial water temperature: +5°C

Minimum ambient air temperature: -10°C

Minimum ambient air temperature: -10°C

Evaluation period: 12h Evaluation period: 12h

Permitted ice formation: nil Permitted ice formation: 10%

Thickness of ProRox PS 971UK pipe section (mm)

21.3 16.0 - ( - ) - ( - )26.9 21.6 - ( - ) - ( - )33.7 27.2 - ( - ) 347 ( - )42.4 35.9 - ( - ) 112 ( - )48.3 41.8 636 ( - ) 72 (80)60.3 53.0 220 ( - ) 42 (50)76.1 68.8 105 ( - ) 27 (30)88.9 80.8 73 (80) 21 (25)

114.3 105.3 46 (50) 15 (25)168.3 158.6 26 (30) 9 (25)219.1 207.9 19 (25) 7 (25)

NOTE 1 Thicknesses given are calculated specifically against the criteria noted in the table. These thicknesses may not satisfy other design requirements.

NOTE 2 Some of the insulation thicknesses given are too large to be applied in practice but a selection is included to highlight the difficulty in protecting small diameter pipes against freezing. To provide the appropriate degree of frost protection to certain sizes of pipes, it may be necessary to provide additional heat to the system, for example by circulating the water or heat tracing.

NOTE 3 Assumed densities (ρ) and heat capacities (CP) are as follows: — ρ water = 1 000 kg/m³, CP water = 4 200 J/kg K; — ρ steel = 7 840 kg/m³, CP steel = 455 J/kg K.

NOTE 4 Advised thicknesses of ROCKWOOL insulation are shown in brackets.

Table 28 (BS5422:2009) Minimum insulation thickness to protect steel pipes against freezing under selected industrial process conditions

23

ROCKWOOL Technical Insulation (RTI) reserves the right to alter or amend the specification of products without notice as our policy is one of constant improvement.

The information contained in this data sheet is believed to be correct at the date of publication. Whilst ROCKWOOL Technical Insulation will endeavour to keep its publications up to date, readers will appreciate that between publications there may be pertinent changes in the law, or other developments affecting the accuracy of the information contained in this data sheet.

The above applications do not necessarily represent an exhaustive list of applications for their products. ROCKWOOL Technical Insulation does not accept responsibility for the consequences of using their products in applications different from those described above. Expert advice should be sought where such different applications are contemplated, or where the extent of any listed application is in doubt.

More informationFor further details visit our website at www.rockwool-rti.com or phone on +44 (0)871 222 1780

ROCKWOOL Technical Insulation

Pencoed, Bridgend, CF35 6NYT. +44 (0)871 222 1780

26/28 Hammersmith GroveHammersmithW6 7HA Londoninfo@rockwool.co.ukwww.rockwool-rti.com

ROCKWOOL® Technical Insulation (RTI), a subsidiary of the international ROCKWOOL Group, is the worldwide market leader in technical insulation. With our comprehensive product range we cover the whole industrial market and marine & offshore industry, providing a full range of products and systems for the thermal and firesafe insulation of technical applications. Besides sustainable products we offer reliable expert advice, from documentation to delivery and after sales service. Throughout the whole chain from specifier, through dealer to contractor and installer we aim to add value. We don’t just sell products, we supply solutions. It’s this total approach that makes us the ideal choice for professionalism, innovation and trust.

All explanations correspond to our current range of knowledge and are therefore up-to-date. The examples of use outlined in this document serve only to provide a better description and do not take special circumstances of specific cases into account. ROCKWOOL Technical Insulation places great value upon continuous development of products, to the extent that we too continuously work to improve our products without prior notice. We therefore recommend that you use the most recent issue of our publications, as our wealth of experience and knowledge is always growing. Should you require related information for your specific application or have any technical queries, please contact our sales department or visit our website www.rockwool-rti.com

The ROCKWOOL Group is the world’s leading supplier of innovative products and systems based on stone wool, improving the environment and the quality of life for millions of people. The Group is amongst the global leaders within the insulation industry. Together with other building-related products such as acoustic ceilings, cladding boards and our consultancy business, the Group ensures energy efficient and firesafe buildings with good acoustics and a comfortable indoor climate. We create green solutions for the horticultural industry, inventive special fibres for industrial use, effective insulation for the process industry and marine & offshore as well as noise and vibration systems for modern infrastructure.

Our more than 9,700 employees in more than 40 countries cater for customers all over the world. The Group’s head office is located close to Copenhagen. In 2012 the Group generated sales of EUR 1.97 billion. The company is listed on the NASDAQ OMX Nordic Exchange Copenhagen. The Group’s operations have a main presence in Europe and we are expanding production, sales and service activities in North and South America and Asia. Together with a broad network of business partners, this ensures that the Group’s products and systems reach almost every corner of the globe. For more information, please visit www.rockwool.com

ROCKWOOL Technical Insulation

The ROCKWOOL Group

ROCKWOOL Technical Insulation, ROCKWOOL, SeaRox and ProRox are

registered trademarks of ROCKWOOL International. ROCKWOOL Technical

Insulation reserves the right to change the information in this brochure

without prior notice.

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