Abstract:
Method for laying a pipeline onto a seabed from a lay barge, the pipeline having an inner corrosion proof metallic cladding that is closely fitted with metallic contact to an outer pipe material that is less corrosion proof, distinguished in that a) a section of the pipeline is reeled onto a pipe laying drum, whilst an overpressure of 5-25 bar is maintained within the section by means of a pressurised fluid inside the section, b) a further pipeline section is joined to the section already reeled onto the pipe laying drum, whilst the pipeline is motionless without mechanical movement, as the overpressure can be relieved as long as the sections are without mechanical movement, c) an overpressure of 5-25 bar is applied within the sections and the further section is reeled onto the pipe laying drum, d) several sections are joined together and reeled onto one or several pipe laying drums by repeating step b) and c) until the predetermined pipeline length is achieved, e) the pipeline is laid from the lay barge onto the seabed using conventional method, whilst an overpressure of 5-25 bar is maintained within the pipeline by means of a pressurised fluid until the pipeline is correctly placed onto the seabed.
Abstract:
Method for laying a pipeline onto a seabed from a lay barge, the pipeline having an inner corrosion proof metallic cladding that is closely fitted with metallic contact to an outer pipe material that is less corrosion proof, distinguished in that a) a section of the pipeline is reeled onto a pipe laying drum, whilst an overpressure of 5-25 bar is maintained within the section by means of a pressurised fluid inside the section, b) a further pipeline section is joined to the section already reeled onto the pipe laying drum, whilst the pipeline is motionless without mechanical movement, as the overpressure can be relieved as long as the sections are without mechanical movement, c) an overpressure of 5-25 bar is applied within the sections and the further section is reeled onto the pipe laying drum, d) several sections are joined together and reeled onto one or several pipe laying drums by repeating step b) and c) until the predetermined pipeline length is achieved, e) the pipeline is laid from the lay barge onto the seabed using conventional method, whilst an overpressure of 5-25 bar is maintained within the pipeline by means of a pressurised fluid until the pipeline is correctly placed onto the seabed.
Abstract:
The present invention relates to a cable (10) for direct electrical heating of a subsea pipeline (28), the cable comprising: an axially soft inner core (12); and electrically conducting wires (14) surrounding said core. The present invention also relates to a system comprising such a cable, use of such a cable, and a method for direct electrical heating of a subsea oil/gas pipeline.
Abstract:
Mechanical fastening device for cathodic protection of an insulated pipeline (1), comprising: a fastening ring (6) of diameter to fit around the insulated pipeline, means (7) for electrical contact, and means (8) for fastening of, or connection to, a sacrificial anode, distinguished in that the means (7) for electrical contact are in the form of bolts that can be screwed through the fastening ring and the insulating coating of the pipeline, to good electrical contact with the pipeline (1), as the length of the bolts and the fastening ring are adapted such that bolts are kept pre-tensioned in good electrical contact with the pipeline in the full range of pressure and temperature in the pipeline and the surroundings.