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Pipe laying in casings

Technical solutions

Pipe laying in casings

Laying of a carrier pipe through a casing involves:
– the centring and guidance of each component within the casing,
anchoring the components together, to allow pulling of the section through the casing.
Ductile iron socket pipes may easily be installed through casings.

Before preparing the pipe guide sled:
– clear the accesses to the casing,
– check the condition and alignment of the casing,
– ensure that the size of the guide sled is compatible with the internal diameter of the casing.

Guide sled preparation

Depending on the pipe diameter, the socket diameter and possibly the anchoring gland, use, or construct, the guide sled and centring collars most appropriate for pulling the pipes through the casing. Make sure that the traction load does not exceed the joint resistance.

DNDe (mm)Maximum traction load (kN)
STD Vi C40/C30Univ Vi K9Univ Ve K9
607712  
80981745 
100118256170
1251443685104
15017045109136
20022262166201
25027494230271
300326134284342
350378180281426
400429231289506
450480235290579
500532245356667
600635317507855
700738  1155
800842  1392
900945  1753
10001048  2157
11001152   
12001255  2474

Using ANCHORED STANDARD pipes

Pass a wire rope through the casing and attach it to the first pipe.
Attach guidance and centring collars behind each socket.
Pull the first pipe into the casing.
Joint the spigot into the second pipe.
Anchor the joint.
Having completed this operation:
– pull the second pipe into the sleeve,
– continue joining ANCHORED STANDARD pipes on until the first pipe emerges from the other end of the casing.

With ordinary STANDARD joint and anchoring cable

Pass a drag rope through the casing, attached to the anchoring cable.
Attach guidance and centring collars behind each socket, equipped with a fastening for the drag rope.
Position the first pipe in the casing.
Attach the anchoring cable and pull the pipe.

Joint the spigot into the socket of the second STANDARD pipe.
Attach the anchoring cable to the second support and continue pulling the pipes.
Continue joining STANDARD pipes on until the first emerges from the other end of the casing.
Uncouple the drag rope attached to the first pipe, leaving the anchoring cable in position.

Pressure testing

Before connecting the two ends of the main in the casing to the rest of the system it is advisable to subject it to a pressure test, identical to that for the remainder of the system.

See also

Ductile cast iron pipelines are suitable for all soil types. Saint-Gobain PAM offers a comprehensive network that can adapt to any environmental or soil conditions.