METHOD OF UNDERWATER PIPELINE NAKED SECTION REPAIR Russian patent published in 2013 - IPC F16L1/26 

FIELD: transport.

SUBSTANCE: repair process for underwater pipeline section with sag comprises making artificial bottom surface at pipeline bed wash-out, placing solid cellular carpet at wash-out area, placing on said carpet and pipeline of loose inert material, for example, gravel to make 1 m-thick layer to be fixed thereat. Said carpet if fixed by steel transverse beams to be locked thereat. Then, carpet both ends are displaced by winches upward and towards each other to redistribute said gravel and to place it under and above pipeline unless carpet ends are located above pipeline at minimum distance between carpet ends. Loops secured at carper ends are interconnected by round-link chains with hooks provided at their ends. Gavel volume at 1 m-thick layer makes V=π(D+1)L, where V is gravel volume, m³, D is pipeline diameter, m, L is pipeline naked section length, m.

EFFECT: lower costs and labor input, fast repair.

2 dwg