PREMANT district heating pipe
PRE 6.365
Expansion pad
Description
In order to absorb expansion movements of the underground pipe system in bends, branches and reduction pieces, expansion pads must be
applied to the outer PE casing in these areas. Expansion pads are manufactured from cross-linked closed-cell polyethylene, are permanently
elastic, do not decay and are resistant to chemicals. The expansion zone is designed on the basis of pipe statics calculations.
Delivery
The delivery scope for an expansion zone of 1 m comprises 2 pieces of expansion pad strip, length 1000 mm, which are glued onto the outer
casing at the 3 o'clock and 9 o'clock positions. Laminate is then wrapped around the entire zone in order to prevent sand or soil particles from
penetrating between the expansion pad and the PE casing.
Material:
Nominal width:
Nominal thickness:
120
Polyethylene particle foam
Diameter of
outer casing
mm
90 up to 160
180 up to 280
315 up to 355
400
500 up to 560
630 up to 670
710
800
900
1000
17.1.2025 BGP
Subject to technical changes
Nominal size
Weight
kg/piece kg/m
0.154
0.307
0.307
0.614
0.461
0.922
0.614
1.229
0.768
1.536
0.922
1.843
1.075
2.150
1.229
2.458
1.382
2.765
1.536
3.072
Volume
m3/piece m3/m
0.0048
0.0096
0.0096
0.0192
0.0144
0.0288
0.0192
0.0384
0.0240
0.0480
0.0288
0.0576
0.0336
0.0672
0.0384
0.0768
0.0432
0.0864
0.0480
0.0960
Size I
Size II
Size III
40 mm
120 mm
240 mm
360 mm
Properties
Apparent (bulk) density
Tensile strength
Compressive stress
50 % deformation at 23 °C
Vibration fatigue test, 80 000 load changes
- Change in thickness
- Change in hardness number
Absorption of water (volume fraction)
- after 1d
- after 7d
Thermal conductivity at 10 °C
Value
Unit
32
Kg/m3
160
kPa
100
kPa
2,4
%
2,4
%
2,0
%
3,0
%
0,040
W/mK
EP strip = 1 m
PUR insulation
Medium pipe
Laminate
Name
Size 1
Size 2
Size 3
Size 4
Size 5
Size 6
Size 7
Size 8
Size 9
Size 10
existing
I
II
III
II+II
II+III
III+III
III+II+II
III+III+II
III+III+III
III+III+II+II
240
360
1
0
0
0
1
0
0
0
1
0
0
0
