PexFlex - Logstor

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3.2.0.1

Application

PexFlex DH

Overview

PexFlex DH (District Heating) pipes form a complete flexible pipe system for district heating distri-

bution networks and minor house entries.

The long flexible pipes make PexFlex very usable for:

- branch pipes without joints

- passage of vegetation and other obstacles

- hilly areas

- tunnelling and thrust-bore methods

Continuous operating temperature: 85°C

Max. temperature: 95°C

Operating pressure: ø 16, 22 and 28 mm: 10 bar

ø 20, 25, 32, 40, 50, 63, 75, 90, 110 mm: 6 bar

Applicable together with installation methods I-III, but with the above-mentioned temperature and

pressure limitations.

PexFlex DH pipes comply with prEN 15632-2

Description

Materials PEX pipe: The service pipe is made of PEXb (silan cross-linked) with external EVOH oxygen

barrier, preventing oxygen entrance into the district heating water.

The pipe cross-links on operationalization and complies with the requirements in

EN/ISO 15875.

Insulation: Polyurethan foam

Blowing agent: Cyclopentan

Certified thermal conductivity l50

= 0.022 W/mK

Diffusion barrier Between the casing and the foam a multilayer polymer diffusion barrier is

embedded, retaining the diffusion of insulation gases and thus reducing ageing

Outer casing Polyethylene, PE-LD

Di

H

De

PexFlex is available in coils of 50 or 100 m.

Di 1600 1600 1800 1800 2000 2000

De 2200 2300 2200 2300 2300 2300

H50

300 350 500 650 1100 1300

H100 425 475 800 1150 2250 2400

Measure, Outer casing, ø out. mm

approx. 77 90 110 125 140 160

Fixed lengths can be ordered to measure.

Minimum 10 m an maximum 90 m.


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3.2.0.2

Component

overview/data

PexFlex DH

Overview

PexFlex single pipe, PN 6

Component No. 2100

PEX service pipe Series 1

Outer casing

Series 2

Outer casing

Series 3

Outer casing

ø out. Wall thick. ø out. Wall thick. ø out. Wall thick. ø out. Wall thick.

mm mm mm mm mm mm mm mm

20 2.0 77 2.2 90 2.5 110 2.5

25 2.5 77 2.2 90 2.5 110 2.5

32 2.9 77 2.2 90 2.5

40 3.7 90 2.5 110 2.5

50 4.6 110 2.5 125 2.5

63 5.8 125 2.5 140 3.0

75 6.9 140 3.0 160 3.090 8.2 160 3.0

110 10.0 160* 3.0

* Series 0. Note! Preinsulated components have casing pipes ø 180 mm.

PexFlex single pipe, PN 10

Component No. 2100


Outer casing

Series 2

Outer casing

Series 3

Outer casing

ø out. Wall thick. ø out. Wall thick. ø out. Wall thick. ø out. Wall thick.

mm mm mm mm mm mm mm mm16 2.2 77 2.2 90 2.5 110 2.5

22 3.0 77 2.2 90 2.5 110 2.5

28 4.0 77 2.2 90 2.5 110 2.5

PexFlex TwinPipes, PN 6

Component No. 2190


Outer casing

Series 2

Outer casing

ø out. Wall thick. ø out. Wall thick. ø out. Wall thick.

mm mm mm mm mm mm

16/16* 2,2 90 2,5 110 2,5

20/20 2,0 90 2,5 110 2,5

25/25 2,5 110 2,5 125 2,5

32/32 2,9 110 2,5 125 2,5

40/40 3,7 125 2,5 140 3,0

50/50 4,6 160 3,0

* PN 10



3.2.1.1

Joint types

PexFlex DH

Straight joints

There are 3 different kinds of straight joints in connection with PexFlex DH pipes:

- straight joint, same dimension

- reduction- connection to straight preinsulated pipes

Straight joints PexFlex DH service pipes are connected by

means of press couplings, ensuring a perma-

nent tightness at all temperature variations.

Reduction

1 2

Reduction between two PexFlex DH service

pipes is carried out by means of reduction

press couplings.

Component

overview

Straight and

reduction coup-

lings

Coupling end 1 16 20 22 25 28 32 40 50 63 75 90 110

Coupling end 2

16 x x

20 x x x

22 x x

25 x x x

28 x

32 x x

40 x x

50 x x

63 x x

75 x x

90 x x

110 x

Component No. 6000



3.2.1.2

PexFlex DH

Straight joints

Transition Transitions between PexFlex DH and steel

service pipes are made using weld couplings

which are welded on to the steel service pipeand pressed on to the PEX service pipe.

Component

overviewWeld couplings

Steel pipePEX pipe

16 20 22 25 28 32 40 50 63 75 90 110

26.9 x x x x x

33.7 x x x x x

42.4 x

48.3 x x

60.3 x

76.1 x

88.9 x

114.3 x

Component No. 6000

The coupling is made of weldable steel

Press coupling

welding, closed

Component No. 6000

The coupling is made of weldable steel

Steel pipePEX pipe

16 20 22 25 28 32 40

26.9 x x x x x

33.7 x x

42.4 x

Materials

1

2 3

Press fittings for PexFlex DH consist of:

1. Base unit: Brass or red brass dependent

on the dimension

2. Press ring: Brass or steel

3. Squeezing ring: Brass or steel

The base unit of the weld coupling is made of

weldable steel.



3.2.1.3

PexFlex DH

Straight joints

Casing joints The simplest way to carry out joint couplings

in connection with straight joints, reductions

and transitions is to use the FXJoint with aflexible core of the insulation shells, adjusting

to the press couplings.



Component

overview

Component No. 2500.

3.2.2.1

PexFlex DH

Bends

Bend types There are 2 types of bends for PexFlex DH:

- Preinsulated 90° bend

- Elbow coupling. See terminations with PexFlex DH page 3.6.2.2.

90° preinsulated

bend

PexFlex bends have PEX service pipes.

Do not shorten!

Are available without free ends.

PEX pipe

ø out. mm

Outer casing ø out. mm

Series 1 Series 2 Series 3

20 77 90 110

22 77 90 110

25 77 90 110

28 77 90 110

32 77 90 110

40 90 110 125

50 110 125 140

63 125 140 160

75 140 160

90 160

110 *180

* PexFlex in coils is delivered as ø 110 mm in

a ø 160 mm casing pipe.



3.2.3.1

PexFlex DH

Branches

Branch types There are 2 fundamentally different ways to connect to main pipes:

- T-connection with press couplings when branching from PEX main pipe.

To be used with the flexible branch joint programme. See section 3.5 ”Casing joints for

FlexPipes”

- Preinsulated branches with steel service pipes.

Can be welded onto steel main pipes or be equipped with weld couplings to be installed

onto PEX main pipes.

Straight branch

with press cou-

pling

Press T pieces are cast in one piece in

dezincification resistant brass.

Component No. 6060.

PEX main

pipe

ø out. mm

PEX branch

ø out. mm

16 20 25 32 40 50 63

20 x

25 x x x

32 x x x

40 x x x x

50 x x x x x

63 x x x x x x

Preinsulated

branches for

PexFlex DH,

general

3 types of preinsulated branches with steel service pipes are available for the PexFlex DH

system:

- Straight branch

- 45° perpendicular branch

- 90° parallel branch

All branches are produced in accordance with EN 448.

They are delivered with 150 mm free pipe ends ready for weld couplings to be welded on.

(However, 45° branches are delivered with weld couplings already welded on).

Straight preinsu-

lated branch 5 0 0Component No. 3400.

Main pipe

ø out. mm

Steel pipe/Casing

L

mm

Branch. ø out. mm

33.7/77 48.3/110 60.3/125

33.7/77 1000 x

48.3/110 1000 x x

60.3/125 1200 x x x

Also available in series 2 and 3.



3.2.3.2

PexFlex DH

Branches

45° preinsulated

branch 1 0 0

0

1 2 0 0

Component No. 3000.

Total height, H = D1 + D

2 + 75 mm

Delivered with weld couplings already welded

on.


Main pipe

ø out. mm

Steel pipe/Casing

Branch, ø out. mm

20/77 25/77 32/77 40/90 50/110 63/125 75/140 90/160

75/140 x x x x x x

90/160 x x x x x x x

110/180 x x x x x x x x

90° preinsulated

branch

Component No. 3200.

L2 = 1/2 x L1

Total height, H = D1 + D

2 + 125 mm

Main pipe

ø out. mm

Steel pipe/Casing

Lmm

Branch. ø out. mm

33.7/77 48.3 /110 60.3 /125

33.7/77 1000 x

48.3/110 1000 x x

60.3/125 1200 x x x




Application

Description

Materials

Component No.

Hot tapping valve: Valve chamber: Steel

Ball valve: Stainless steel

Sealing: PTFE

Weld coupling: Steel part: St. 37.0, DIN 1676/84

+ press part: Brass

22 x 8-137.201

28 x 8-137.203

32 x 8-137.205

40 x 8-137.207

Branch pipe Hot 90° weld

Service pipe tapping valve coupling

ø mm Product No.

5

1

2

4

3

Hot tapping components for PexFlex.

Hot tapping valve, component No. 4280.

Hot tapping tools, product No. 8-49915.

On systems in operation branches with

PexFlex can be installed by means of hot

tapping. The small dimensions of the hot tapping val-

ves mean that they can be fitted into most

standard branch joints.

Max. operating pressure in connection with

hot tapping:

- ø 22 and 28 mm PexFlex: 10 bar

- ø 32 and 40 mm PexFlex: 6 bar

The hot tapping valve is adjusted to the

FlexPipe systems.

1. Hot tapping valve

2. Pipe end for direct welding of e.g. 90°

weld coupling

3. Conic pipe plug with hexagon socket

4. Operating screw with slot, acting as a

position indicator

5. 90° weld coupling

(Only in connection with 90° steel joint

branch)

3.2.4.1

PexFlex DH

Hot tapping, type 1


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PexFlex - Logstor