Cables jetting
Operating principles
Cable jetting is a technique of placing cables in preinstalled ducts. It consist in a pushing force and a drag force that are simultaneously exerted on the cable by means of a mechanical pusher and a compressor providing a high speed air flow respectively.
Cable jetting enables you to:
- Install safely, depending on cable and duct design, very long sections of non-armoured cable up to 3km or more
- Place cables, in urban conditions, in one step, over several manholes, into their final location
- Create slack required for splicing, without exerting stress, at any point of the duct path
- Install over very long distances, i.e. 12 km or more, continuous lengths of cable in cascading mode
- Secure an almost constant daily installation capacity whatever the complexity of the duct run
- Remove old and place new cables in one step for network upgrading purposes
- Install a second or even third cable in an already occupied duct
- Install two cables in one duct simultaneously (requires two machines)
“Jetting's” advantages
- Better cable protection during installation as stresses on the cable are much lower during installation
- Non armoured cables can be safely installed
- Much longer cables can be placed over tortuous routes as bends along the duct path, or duct undulations, have a little effect on the “jetting” performance
- Process control easy to learn
- Safer process for operators, provided safety rules applicable to compressed air systems are respected
- Reduced infrastructure and manpower costs
- Faster installation, hence higher daily production
