Pre-insulated pipes for industry
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Pre-insulated pipes for industry

Pre-insulated pipes for heat supply - the most ones in the market
Pre-insulated pipes
Ten good reasons for choosing Logstor
Areas of application for pre-insulated pipe systems
Insulation
Watertight joint systems
Joint assembly
High temperatures 1, 2 and 3
Tracing
Flexible pipe systems
Low temperature


Pre-insulated pipes

A pre-insulated pipe normally consists of three parts.

Inside is the carrier pipe, which is typically made of steel, stainless steel, copper or plastic. Then comes an insulating layer of polyurethane foam (PUR foam), which is specially suited due to its high insulating qualities compared to mass and volume. On the outside is a protective jacket of plastic or steel.

The structure of a pre-insulated pipe

Carrier pipes
Steel

St.37 . St.35.8 . 33.2
Stainless steel
AISI 304L . AISI 316L . Dairy pipes
Plastic
PEX . HDPE . PVDF . PVC
Others
Copper . GRP, etc.

Jacket pipes
Plastic

HDPE black or white
Steel
Black or stainless
Spiro
Galvanised . Aluminium . Stainless

 

Insulation
Low temperature . LT

-200oC til +120 oC
Normal temperature . NT
-60oC til +140 oC
High temperature . HT1
+140oC til +165 oC
High temperature . HT2 & HT3
+140oC til +210 oC

 

Carrier pipes

Carrier pipes are selected according to the medium to be transported.

They can be made from steel, stainless steel, copper or plastic (the pipe can be fitted a tracer pipe or an embedded heating cable).

Media/ Carrier Pipe

steam

domestic water

brine

ammonia

refined products

ice water

oil

waste oil

glycol

Steel pipes

•

 

•

•

   

•

 

•

Stainless steel pipes

•

•

•

 

•

•

 

•

 

Plastic pipes

 

•

•

•

•

•

•

•

•

Copper pipes

 

•

             

Summary of carrier pipes and common media

Jacket

As standard, industrial pipes are supplied with a HDPF (polyethylene) jacket, in black or white. These jackets have many advantages, as they are impact-proof, watertight, resistant to salt and chemicals, hygienic and non-corrosive. Pipes with black HDPE jackets are UV-resistant, as a result of the addition of UV-retardant additives. Black jacket pipes can therefore be used both outdoors and indoors. Pipes with black HDPE jackets are always used for pipes laid underground. White jackets can only be used for indoor pipe installations.

The various jackets are approved in accordance with NT Fire 4102. The relevant fire classifications are listed below:

Fire classifications NT . fire 4102

Black HDPE

Class 2

White HDPE

Class 2

Aluminium spiro

Class 2

Galvanised steel spiro

Class 1

Steel in steel

Class 1

Fire classification broken down by outer jacket


 

 

 

 

 

Jackets in other qualities and materials can be supplied to order. Some examples include: coated steel pipes, Corten pipes, special plastic pipes.

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Ten good reasons for choosing Logstor

Pre-insulated pipe systems have several advantages over traditional insulated pipes:

1. Pre-insulated pipes using polyurethane foam as insulation have high insulation qualities. It is a fact that heat loss in a pre-insulated pipe from Logstor is approx. 40% less than in a corresponding system with traditional insulation (mineral wool and metal jacket). This saving is often so significant that any additional costs at the point of delivery are recovered in less than one year.

Logstor’s StaTech program calculates the exact saving based on the customer’s specifications.

2. Pipe supports are fitted outside the jacket, thus avoiding cold and heat bridges.

3. The jacket is made of black or white polyethylene, produced in accordance with EN 253 and DIN 8075.

Pipes with black HDPE jackets are UV-resistant, as UV-retardant additives are added. Black jacket pipes can therefore be used both indoors and outdoors without limitations.

HDPE jacket pipes are also resistant to salt and chemicals.

4. The insulation and jacket together have a very high mechanical strength, which makes pre-insulated pipe systems resistant to physical effects, e.g. when they are used as a foot bridge.

5. Pipe and jacket units are 100% watertight, so the pipe systems can be rinsed and washed. Clean pipes result in a better working environment, with low maintenance costs.

6. Low operating costs throughout the life time of the pipe system:

Operating costs of insulated pipes
Maintenance costs

Pre-insulated pipe systems from Logstor
Traditionally insulated pipes

Operating costs are kept at a constant, low level in a pipe from Logstor

7. Reduced installation costs. As the pipes are already insulated in the factory, there is no need for expensive re-insulation.

8. Quick, problem-free installation in one process, without long periods during which operations have to stop.

9. Minimal maintenance costs.

10. Effective corrosion resistance.

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Areas of application for pre-insulated pipe systems

Advantages by using pre-insulated pipe systems

 

indoor, dry

indoor, wet

outdoor

buried

long distances

cold

•

•

•

•

heat

*

•

•

•

short distances

cold

•

•

•

•

heat

*

•

(*)

•

* Here traditional insulation (mineral wool with metal jacket) can be used as an alternative solution.

In a large number of projects, major benefits can be achieved by using pre-insulated pipe systems.

When a system contains several bends and few straight pipes, it will often be more profitable to use traditional insulation. On the other hand, in long, straight pipes, the use of pre-insulated pipe systems can be generate major economic benefits.

At operating temperature below room temperature, condensation will be formed in traditional insulation. The required diffusion density can be achieved in the easiest and cheapest way with the Logstor system.

Our engineers and technicians offer a system analysis for each project, in order to determine whether it is a good idea to use pre-insulated pipes.

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Insulation

Logstor pre-insulated pipes are insulated with polyurethane foam (PUR foam), which has extremely high insulation properties. Polyurethane has a lambda value of 0.022 at -20oC and 0.027 at +50oC.

The polyurethane foam is produced from polyol and isocyanate. The foam is homogenous, and complies with functional requirements of EN 253.

PUR is unsurpassed as an insulation material for all pipe systems between -200oC and +140oC, and in combination with mineral wool up to +315oC. It is pressure-resistant, and in combination with the media and jacket pipe it creates a sandwich design.

PUR retains its mechanical properties unchanged for more than 30 years.

PUR insulation

material

Polyurethane foam is made from polyol and isocyanate. The foam is homogenous with an average cell size of max. 0.5mm.

density

45-60 kg/m²

water absorption if boiled

≤ 10% (Vol)

compressive strength 10% deformation

≥ 0,3 N/mm²

axial sheer strength

≥ 0,12 N/mm²

tangential sheer strength

≥ 0,20 N/mm²

thermal conductivity at 50oC

< 0,03 W/moC

max.operating temperature

140 oC

PUR insulation. Data sheet.


Transmission coefficients

carrier pipe
DN

series 1
U W/moC

series 2
U W/moC

series 3
U W/moC

16

0.115

0.101

0.093

20

0.136

0.117

0.107

25

0.166

0.138

0.125

32

0.170

0.151

0.137

40

0.196

0.170

0.154

50

0.219

0.192

0.167

65

0.261

0.216

0.188

80

0.269

0.226

0.199

100

0.282

0.236

0.207

125

0.328

0.273

0.231

150

0.391

0.310

0.256

200

0.425

0.329

0.268

PUR insulation. U-values.

Example,

Heat loss in DN 150 conduit, series 2:
tf = 160oC; to = 10oC.

The heat loss for a pair of pipes is obtained as follows:
Ф = U · (tf - to) = 0,31W/moC · (160oC - 10oC) = 46.5 W/m

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Watertight joint systems

The pre-insulated pipe systems are assembled and installed quickly and efficiently with the aid of Logstor’s comprehensive range of standard joints, which consists of straight joints and bend joints, T-joints, end caps and other accessories. This guarantees an optimal pipe layout for all projects. The joints are just as well insulated and secure as the rest of the system.

Straight joint set
With PUR half shell, shrink sleeves and accessories. Black or white. Angle 0 - 15°.

 

 

Curved joint set
With PUR half shell, shrink sleeves and accessories. Black or white. Angle 15 - 90°.

 

 

T-joint
With PUR half shell, shrink sleeves and accessories. Black or white. Main pipe dimensions 90–315mm. Branch pipe dimensions 66 to 180mm. Angled branch pipes are available. (Requires separate connection tool).

 

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Joint assembly

When the pipe system’s carrier pipes have been installed and tested for pressure, and any tracer cables have been installed, the pipes are connected using unique joint systems.

Double-sealed BX joint set for laying underground.

 

 


Assembly of insulation half shell.

 

 


Shrink film.

 

 


Shrinking on the joint

 




We can perform joint assembly, or we can train the customer or the customer’s fitters or supervisors in fitting the jacket connections using Logstor’s shrinking products. The training course lasts three days, and concludes with a test. A certificate is issued.

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High temperatures 1, 2 and 3

HT 1: media temperatures from +140oC to +165oC
HT 1 is an above ground high-temperature system that cannot be laid underground. This system, which is used for media such as steam and hot oil, consists of modified polyurethane, and has a unique insulation quality that guarantees low operating costs. The system can be supplied with black or white jacket.

HT2: media temperatures from +140oC to +210oC
HT2 is an above ground high-temperature system that cannot be laid underground. This system, which is used for media such as steam and hot oil, consists of polyurethane with an inner layer of mineral wool. The mineral will brings down the temperature to the permissible application temperature for polyurethane foam. The system has good insulation qualities, which guarantee low operating costs and minimum maintenance. The system can be supplied with black or white jacket pipes.

HT3: media temperatures from +140oC to +210oC
HT3 is an above ground high-temperature system that can be used underground. This system, which can be used for media such as steam and hot oil, consists of polyurethane with an inner layer of mineral wool. The mineral wool brings down the temperature to the permissible application temperature for polyurethane foam. The carrier pipe is supported by special spacers made of stainless steel. The system has good insulation qualities, which guarantee low operating costs. The system can be supplied with black jacket pipes.

HT1, HT2 and HT3 are available in dimensions up to DN 300.

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Tracing

To insert heating cables or a liquid that can be heated, Logstor’s pipe systems can be fitted with tracer pipes. This insert can both protect a pipe system from frost and maintain a required temperature. Tracing can be used, for example, with electricity, water, steam or hot oil. As a standard, pipes and fittings can be supplied with embedded tracer pipes.



1- Aluminium pipe to hold heating cable.
2 - Self-regulating heating cable.
3 - Opper for liquid media such as water or oil.

Self-regulating heating cables with a power output of up to 35W/m can be embedded directly in the insulation. As an alternative, self-regulating heating cables or cables with a constant output of up to 65W/m can be drawn through embedded tracer pipes. If more than this is necessary, several tracer pipes or a special solution must be used.

Heating cable design


1- Fluoropolymer outer jacket (-CT) or modified fluoropolymer outer jacket (-CR).
2 - Tinned copper braid (max. Resistance 0.010W/m).
3 - Modified polyolefin insulation.
4 - Self-regulating conductive core.
5 - 2 mm2 copper conductors.

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Flexible pipe systems

Logstor is a leader in the flexible pipe systems, which are available with carrier pipes in steel, copper or PEX, in both single-pipe and double-pipe systems.

LR-PEX
LR-Pex has a carrier pipe made of PEX, which is designed for temperatures of max. 95oC, and depending on the dimensions can tolerate a pressure of 6-10 bar. The PEX carrier pipe is also fitted with an oxygen diffusion retainer made of EVON, so that oxygen cannot diffuse into the water.


LR-Pex

Dim.: carrier pipe/jacket pipe

Coil length

22/66

28/77

32/77

40/90

50/110

63/125

75/140

90/ 160

110/ 160

110/ 180

10-100m

 

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•

•

•

•

•

•

•

 

10-200m

•

                 

12m length

         

•

•

•

 

•

LR-Pex for tap water
LR-Pex for tap water has a PEX carrier pipe, without an oxygen diffusion retainer, and it tolerates a max. Temperature of 95oC and a max. Pressure of 10 bar.



LR-Pex for tap water

Dim.: carrier pipe/jacket pipe

Coil length

22/66

28/77

32/77

40/90

50/110

63/125

10-100m

 

•

•

•

•

•

10-200m

•

       

12m length

         

•

Cu-Flex
Cu-Flex has a carrier pipe made of soft copper. The system can be used up to 130oC and tolerates pressure to a max. 16 bar.



CU-Flex

Dim.: carrier pipe/jacket pipe

Coil length

152/66

18/66

22/66

28/77

35/90

42/110

54/125

70/140

88,9/160

10-100m

•

•

•

•

•

       

12m length

       

•

•

•

•

•

Steel-Flex
Steel-Flex has a carrier pipe made of steel, which can be used up to 130oC. Steel-Flex can tolerate pressure up to 25 bar.

 



Steel-Flex

Dim.: carrier pipe/jacket pipe

Coil length

22/66

28/77

10-100m

•

•

The Polarflex system uses PEM as a carrier pipe.

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Low temperature

For projects within the temperature range of -200oC to +120oC, we offer a specially developed low-temperature system, which guarantees long durability under extreme conditions. The low-temperature system is used for such purposes as marine, onshore and offshore installations, as well as projects involving LPG, LNG, nitrogen and ethylene.

The system consists of straight pipes, bend fittings and joints. The jacket can be supplied in black or white.

The diagrams display the transmission coefficient (U-value) for various dimensions of carrier pipe and jacket pipe.

U-values of Cu pipes, freely suspended (W/moC)

U-values of single pipes

media temp. 80oC

DN

d1

series1

series2

series3

15

21.3

0.115

0.101

0.093

20

26.9

0.136

0.117

0.107

25

33.7

0.166

0.138

0.125

32

42.4

0.170

0.151

0.137

40

48.3

0.196

0.170

0.154

50

60.3

0.219

0.192

0.167

65

76.1

0.261

0.216

0.188

80

88.9

0.269

0.226

0.199

100

114.3

0.282

0.236

0.207

125

139.7

0.328

0.273

0.231

150

168.3

0.391

0.310

0.256

200

219.1

0.425

0.329

0.268

Carrier pipe
Copper, soft copper SIS 501502, cleaned and sealed
Temperature
-200oC to +120oC
Media
Liquid nitrogen, LNG and LEG
Insulation
Straight sections: polyurethane foam (PUR)
Jacket
Straight sections: HDPE, black and white
Coils: PEL, black


Correction factor of Tn<>80oC

Media temp. -20oC

Factor 80oC=1,0

-40

0.87

-20

0.89

0

0.91

20

0.93

40

0.96

60

0.98

80

1.00

100

1.02

120

1.04

140

1.07

160

1.09


U-values of St 35.8i (W/moC), freely suspended

U-values of single pipes

Media temp. -20oC

DN

d1

series1

series2

series3

15

21.3

0.095

0.083

0.007

20

26.9

0.113

0.096

0.088

25

33.7

0.138

0.114

0.103

32

42.4

0.141

0.124

0.113

40

48.3

0.163

0.141

0.127

50

60.3

0.182

0.159

0.138

65

76.1

0.218

0.179

0.155

80

88.9

0.225

0.188

0.165

100

114.3

0.235

0.196

0.171

125

139.7

0.274

0.228

0.192

150

168.3

0.238

0.260

0.213

200

219.1

0.360

0.277

0.223

Carrier pipe
Steel 32.8L
Temperature
-20oC
Insulation
Hard polyurethane foam (PUR)
Jacket
HDPE, black and white

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