at least one of a spacing between the windings and an angle of slope between the windings and a pipeline longitudinal axis varies along the pipeline longitudinal axis to change {HEAD ~ the winding density} along {TAIL ~ the pipeline longitudinal axis} as a function of local mechanical load requirements of the pipeline 
at least one of a spacing between the windings and an angle of slope between the windings and a pipeline longitudinal axis varies along the pipeline longitudinal axis to change { HEAD ~ the winding density } along { TAIL ~ the pipeline longitudinal axis } as a function of local mechanical load requirements of the pipeline
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH