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
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14.1.0.1
TwinPipes
Trench
Cross section of The cross section of the trench must as a
trench minimum be as appears from the illustration.
min.
Min. 100 mm stoneless sand around the
400
!
mm
pipes.
100 mm
In areas with heavy traffic the 400 mm are
measured from the top of the pipe to the
100 mm
bottom of the asphalt or concrete layer.
100 mm
100 mm
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.
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
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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 If a straight pipe run is not terminated with a
straight pipe runs preinsulated component with preinstalled
a
fixing bars, then weld fixing bars on.
In connection with gas welding protect the
T
H
foam against direct influence.
B
Part no./dimension of fixing bars. Dimension Part no. Measurement, mm
Å‚ out. mm B H T amin
May also be manufactured on location. Use
33.7/140 120791 50 53 4 3
St. 37.0.
42.4/160 120792 50 61 4 3
48.3/160 120793 50 67 4 3
T 60.3/200 120794 70 80 4 3
amin =
2
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. [phone]
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 2-part taper lock muff
muffs
Å‚ 140-315 mm
3-part taper lock 3-part taper lock muff
muffs
Å‚ 355-450 mm
Band muffs Band muff
Å‚ 140 - 560 mm
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.
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14.3.0.2
TwinPipes
Straight muffs
PE-shrink muffs PE-shrink muff
Å‚ 140-450 mm
Please notice that the preinstalled muff
requires additional space.
Insulation of All muff types are provided with a label, specifying the necessary foam quantity = Foam pack
joints number.
However, these statements have been specified for installation on single pipes.
Consequently, it is important to apply the tables in section 14.6 of this manual when
determining the foam pack number to use.
References Product Information: Muff types, straight joints 2.2
Handling and Installation: Insulation of joints 14.6
Handling and Installation · 2003.01 ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. [phone]
14.4.0.1
TwinPipes
Branches
General If a preinsulated branch is used at the end of a pipe run without e.g. preinsulated bend, then
fixing bars must be welded on to the main pipe of the branch.
If preinsulated TwinPipe branches are not used, pay attention to the following:
- On-site made branch, straight taper lock branch, Twin-Twin. Weld fixing bars on the branch
in addition to the reinforcement plates*) at the branch pipe pieces.
See section 14.2.0.1 of this manual.
- On-site made branch with double branch pipe pieces for flexible pipes.
Possibly weld reinforcement plates*) onto the branch pipe pieces.
*) Consequent use of reinforcement plates complies with the more stringent requirements in
accordance with standard draft prEN 13941:2000, also see section 4.2.
Straight taper Remove the insulation and adjust the lengths
lock branch as illustrated.
ordinary conne-
ction
L1
L1
Dependent on dimension there are three dif-
Type 1
L
vÚ
ferent methods to connect the branch pipes
to the main pipe.
Which method to use where, appears from
the table on the following page.
(Type 2 is not used in this range of dimensi-
L1
ons). Type 2
L
vÚ
L1
Type 3
L
vÚ
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440
L2
L2
14.4.0.2
TwinPipes
Branches
Steel pipe Outer casing Type Weld elbow
Connection,
from to from to L L1 L2
Twin-branch to
Å‚ mm Å‚ mm Å‚ mm Å‚ mm R mm V° mm mm mm
Twin-main pipe
42.4 33.7 160 140 1 38 25 310 310
48.3 33.7 160 140 1 38 25 320 325
60.3 33.7 200 140 1 38 25 315 320
60.3 42.4 200 160 1 48 25 315 320
60.3 48.3 200 160 1 57 20 320 325
76.1 33.7 225 140 1 38 25 320 330
76.1 42.4 225 160 1 48 25 315 330
76.1 48.3 225 160 1 57 20 315 330
76.1 60.3 225 200 3 76 5 265 330 65
88.9 33.7 250 140 1 38 30 325 340
88.9 42.4 250 160 1 48 35 320 335
88.9 48.3 250 160 1 57 20 315 335
88.9 60.3 250 200 1 76 20 330 385
88.9 76.1 250 225 3 92 9 280 335 65
114.3 33.7 315 140 1 38 40 355 360
114.3 42.4 315 160 1 48 35 340 355
114.3 48.3 315 160 1 57 40 355 355
114.3 60.3 315 200 1 76 25 335 355
114.3 76.1 315 225 3 92 8 250 355 105
114.3 88.9 315 250 3 115 6 290 355 80
Handling and Installation · 2003.01 ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. [phone]
14.4.0.3
TwinPipes
Branches
Straight branch, Connection of SteelFlex.diff pipe to TwinPipe.
500 mm
bolt muff
Strip the main pipe and mark the branch
pipe as shown in the illustration.
C/C
190 mm
Stripping the branch pipe.
230 mm
Muff installation
Establish connection between branch tee
coupling and flexible pipe by means of short
bolt muffs and reducing rings.
Straight branch, Connection of SteelFlex.diff pipe to TwinPipe.
565 (700) mm
branch band muff
Strip the main pipe and mark the branch
pipe as illustrated.
The number in parenthesis applies to extra C/C
long branch band muffs.
200 mm
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14.4.0.4
TwinPipes
Branches
Straight branch, Stripping and adjusting the branch pipe.
branch band muff
continued
240 mm
Muff installation
In principle to be carried out as shown under  Band muff branch section 5.4.7 of this manual,
but with necessary adjustments.
Only to be carried out by fitters, certified by ALSTOM Power FlowSystems.
References Product Information: Branches, TwinPipes 6.6
Design: Branches, TwinPipes 15.5
Reinforcement plates, general 4.2
Handling and Installation: Installation of branches 5.4
Handling and Installation · 2003.01 ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. [phone]
14.5.0.1
TwinPipes
Hot tapping
Straight taper Remove the insulation and adjust the lengths
lock branch as illustrated.
Hot tapping with
JIP hot tapping
valves
L1
Dependent on dimension there are two diffe-
rent methods to connect JIP hot tapping val- Type 1
L1
ves to main pipes.
L
vÚ
Which method to use where appears from
the table on the following page.
Do not forget fixing bars.
Type 2
L1
L
vÚ
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14.5.0.2
TwinPipes
Hot tapping
Steel pipe Outer casing Type Weld elbow
Connection,
from to from to radius L L1
Twin branch with
Å‚ mm Å‚ mm Å‚ mm Å‚ mm mm V° mm mm
hot tapping to
42.4 33.7 160 140 2 2 180 315
Twin main pipe
48.3 33.7 160 140 2 3 175 310
60.3 33.7 200 140 1 38 5 180 325
60.3 42.4 200 160 2 3 180 320
60.3 48.3 200 160 2 2 160 325
76.1 33.7 225 140 1 38 7 180 330
76.1 42.4 225 160 1 48 6 180 330
76.1 48.3 225 160 1 57 4 160 330
76.1 60.3 225 200 2 2 180 345
88.9 33.7 250 140 1 38 9 190 350
88.9 42.4 250 160 1 48 8 190 335
88.9 48.3 250 160 1 57 6 170 335
88.9 60.3 250 200 1 76 5 165 335
114.3 33.7 315 140 1 38 12 220 355
114.3 42.4 315 160 1 48 11 210 355
114.3 60.3 315 200 1 76 8 180 355
Hot tapping with SteelFlex.diff pipes can be connected to a
b
SteelFlex.diff TwinPipe system in operation by hot tapping
with JIP-hot tapping valves.
aÚ
Dimension a (°) b (mm)
Welding angle and total stripping length of
42.4/160 12 280
branch.
48.3/160 13 280
60.3/200 14 290
76.1/225 16 300
88.9/250 18 310
114.3/315 21 325
Hot tapping The principle of hot tapping follows the description in section 11.4.1 of this manual.
References Product Information: Hot tapping, TwinPipes -TwinPipes 6.6.5
TwinPipes - Flexible pipes 6.6.6
Handling and Installation: Connection to main pipe, hot tapping 11.4.1
Handling and Installation · 2003.01 ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. [phone]
130
14.6.0.1
TwinPipes
Additional Installation Instructions
End muffs To terminate the TwinPipe system preinsu-
lated PE-HD end muffs in two designs
dependent on dimension are used.
They are shaped so there is space for the
welded fixing bars.
Outer casing dimensions Å‚ 400 and 450 mm
require additional removal of foam in order to
a
make space for the fixing bars.
Dimension a
Å‚ mm mm
400 30
450 100
References Product Information End muffs, general 2.7.6
End muffs, TwinPipes 6.10.1.2
Handling and Installation Fixing bars 14.2.0.1
Installation, general 10.5.0
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14.7.0.1
TwinPipes
Insulation of joints, foam packs
Application ALSTOM foam packs are used for all types of TwinPipe joints.
Note! All muff types are delivered with labels, from which also the foam quantity corresponding
to a certain outer diameter appears.
As all muff types, except bolt muffs and band muffs with 2 connecting branches, originally are
calculated for single pipes, the foam specifications on these muffs do not apply directly to
TwinPipes. Consequently, it is important to use the tables in this section.
Part no. Dimension Å‚ mm
main pipe 140 160 200 225 250 315 400 450
Foam pack for
Taper lock muff 5 6 2x4 8 2x6 2x8 2x10 2x11
steel fittings
Straight branch for
outer casing Å‚ mm
140 7 7 9 10 10 2x9
160 8 9 10 10 2x9
200 10 11 12
225 2x8 12
250 12
Hot tapping +
Straight branch for
outer casing Å‚ mm
140 7 2x5 2x6 10 2x9
160 9 10 10 2x9
200 11 11 9+10
Branch tee coupl.
with 2 branches
outer casing Å‚ mm
63 (110) 7 8 9 10 11 2x9
77 (110) 7 8 9 10 11 2x9
90 (110) 7 8 9 10 11 2x9
Dimension Å‚ mm
Part no.
main pipe 140 160 200 225 250 315 400 450
Foam pack for
Band muff 4578 2x6 11 12 2x11
band muffs
Band muff, long 6 7 2x5 2x6 2x7 2x9 2x11 11+12
Branch tee coupl.
with 2 branches
Outer casing Å‚ mm,
standard:
63 7 8 9 10 7+8 9+10 13 11+12
77 7 8 2x6 10 7+8 9+10 13 11+12
90 7 8 2x6 10 11 9+10 13 11+12
extra long:
63 8 9 10 11 8+9 9+11 11+12 2x12
77 8 9 2x7 11 8+9 9+11 11+12 2x12
90 2x5 9 2x7 11 8+9 10+11 9+13 2x12
Handling and Installation · 2003.01 ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. [phone]
14.7.0.2
TwinPipes
Insulation of joints, foam packs
Dimension Å‚ mm
Part no.
main pipe 140 160 200 225 250 315 400 450
Foam pack for
Shrink muff 5689 10 8+9 13 10+12
shrink muffs
Treatment/ Handling and storage of foam packs and insulation of different joint types are described in
Reference section 7.0 of this manual.
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14.8.0.1
TwinPipes
Surveillance
General All preinsulated TwinPipes and preinsulated components to match are available with embed-
ded copper wires for surveillance when connected to mobile or permanently installed measu-
ring equipment.
(Preinsulated components are all available with surveillance wires).
This ensures a good inspection of the pipe system during the construction as well as the ope-
ration phase for faults like:
- Faulty welds
- Installation faults
- Excavation damages
(Flexible pipes are delivered without surveillance wires).
Installation In principle connect alarm wires and components and check the system according to the
installation instructions in section 23.0 of this manual.
Always have a circuit diagram ready before installation of the pipes and the installation.
References Product Information: Surveillance system 16.0
Design: Surveillance system 25.0
Handling and Installation: TwinPipes, straight pipes 14.2
Surveillance system 23.0
Handling and Installation · 2003.01 ALSTOM Power FlowSystems A/S · Fredericia DK · Tel. [phone]