Twin from MontageGB0301.pdf
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14.0.0.1
The TwinPipe system
Overview
Introduction
This section describes the special installation rules which apply when installing the TwinPipe
system.
When the handling and installation instructions coincide with those for the single pipe system,
reference is made to the latter.
General:
Product Information:
TwinPipes
6.0
Design:
TwinPipes
15.0
Handling and Installation:
This manual
Contents
Trench
14.1
Straight pipes, fixing bars
14.2
Straight muffs
14.3
Branches
14.4
Hot tapping
14.5
Other installation instructions
14.6
Insulation of joints, foam packs
14.7
Surveillance
14.8
ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. +45 76 23 30 00
Handling and Installation · 2003.01
14.1.0.1
TwinPipes
Trench
Cross section of
trench
The cross section of the trench must as a
minimum be as appears from the illustration.
min.
Min. 100 mm stoneless sand around the
pipes.
!
400
mm
100 mm
In areas with heavy traffic the 400 mm are
measured from the top of the pipe to the
bottom of the asphalt or concrete layer.
In areas with no or only light traffic the 400
mm are measured from the top of the pipe to
the top of the grass or gravel layer.
100 mm
100 mm
100 mm
The instructive measurements do not take
slopes and possible local requirements to the
trench into account.
Do not forget warning tape(!)
Welds and muffs
Excavate additional 250-300 mm at welds
and muffs under and along the pipes to
ensure sound working conditions.
When using PE-shrink muffs, remember the
requirement for additional space and for sup-
port.
When using preinstalled muff ensure suffici-
ent space for it, min. 1000 mm.
1000 mm
References
Design
Excavation of trench, etc.
15.7
Handling and Installation:
General
1.0
ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. +45 76 23 30 00
Handling and Installation · 2003.01
14.2.0.1
TwinPipes
Straight pipes
General
Due to the distance between the steel pipes it is recommended to weld the pipes together by
means of autogenous welding.
Position in trench
Always place preinsulated TwinPipes and
components, so one service pipe is directly
over the other (flow pipe at the bottom).
The alarm wires must lie at the top of the
joint.
Pipe label in 12 o’clock-position.
Termination of
straight pipe runs
If a straight pipe run is not terminated with a
preinsulated component with preinstalled
fixing bars, then weld fixing bars on.
a
In connection with gas welding protect the
foam against direct influence.
T
H
B
Part no./dimension of fixing bars.
Dimension
Part no.
Measurement, mm
ø out. mm
B
H
T
a
min
May also be manufactured on location. Use
St. 37.0.
33.7/140
120791
50
53
4
3
42.4/160
120792
50
61
4
3
48.3/160
120793
50
67
4
3
T
2
60.3/200
120794
70
80
4
3
a
min
=
76.1/225
120795
90
96
4
3
88.9/250
120796
110
114
6
4
114.3/315
120797
140
139
6
4
139.7/400
120799
170
180
6
4
168.3/450
120800
200
208
6
4
Handling and Installation · 2003.01
ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. +45 76 23 30 00
14.3.0.1
TwinPipes
Straight muffs
General
In principle directional changes should not be made on TwinPipelines in connection with stra-
ight joints. See section 15.4.0.2 in “Design” concerning alternatives.
2-part taper lock
muffs
ø 140-315 mm
2-part taper lock muff
3-part taper lock
muffs
ø 355-450 mm
3-part taper lock muff
Band muffs
ø 140 - 560 mm
Band muff
Only to be carried out by fitters, certified by
ALSTOM Power FlowSystems.
Please notice that sets of additional accesso-
ries must be used when installing on
TwinPipes.
See Product Information page 6.3.0.1.
ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. +45 76 23 30 00
Handling and Installation · 2003.01
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