Flexible conduit with high inertia hoop

The present invention relates to a flexible pipe for transporting, over long distances, a fluid which is under pressure and possibly at a high temperature, such as a gas, petroleum, water or other fluids. The invention relates most particularly to a pipe intended for offshore oil exploration. It relates especially, first, to flow lines, that is to say flexible pipes unwound from a barge in order to be laid generally on the bottom of the sea and connected to the subsea installations, such pipes working mainly in static mode, and, secondly, to risers, that is to say flexible pipes which are unwound from a surface installation such as a platform and are connected to the subsea installations and most of which do not lie below the seabed, such pipes working essentially in dynamic mode. The invention concerns a flexible tubular pipe comprising, from inside outwards, a web () made of interlocked steel strips, an inner impervious sheath () in polymer material, a short-stepped helical winding of interlocked forming wire () arranged above the internal sheath (), at least a hoop () consisting of a short-stepped metal wire winding without interlock, at least a long-stepped tractive armouring layer () wound around the pressure vault and an outer polymer protective and sealing sheath (); the sickness (Ef) of the hoop () is greater than the thickness (Ez) of the metal forming wire (), preferably by one to three times.