Jetting (bridge Construction)
Jetting may refer to: * Cable jetting Cable jetting is a technique to install cables in ducts. It is commonly used to install cables with optical fibers in underground polyethylene ducts and is an alternative to ''pulling''. Pulling Traditionally, fibre optic cables were pulled throug ... * Jetting (injection moulding defect) {{disambiguation ...
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Cable Jetting
Cable jetting is a technique to install cables in ducts. It is commonly used to install cables with optical fibers in underground polyethylene ducts and is an alternative to ''pulling''. Pulling Traditionally, fibre optic cables were pulled through cable ducts in the same way as other cables, via a winch line. Every time the fibre passes a bend or undulation in the duct, the pulling force is multiplied by a friction-dependent factor (which can be reduced by using lubricant). This means that the higher the local pulling force is, the more friction the cable will experience while being pulled against the internal duct wall. This "capstan effect" leads to an exponential force build-up with pull distance, producing generally high pulling forces. Jetting Cable jetting is the process of blowing a cable through a duct while simultaneously pushing the cable into the duct. Compressed air is injected at the duct inlet and flows through the duct and along the cable at high speed. (Preferabl ...
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