A dual-mode crawler is disclosed for traversing a generally tubular target, typically an umbilical, riser or pipe. The crawler can effect a hand-over-hand action along the target and also effect a driven action, such as a push me push you action, along the target. The unit has two or more traversing units directly connected to each other by one or more linear actuators, preferably non-jointed. The crawler is particularly suitable for subsea use, for example with risers for transporting produced hydrocarbons. The crawler may also have a cleaning module or an inspection module. Also disclosed is a subsea tool for traversing a tubular target having means for monitoring the absolute or relative rotation of a crawler and for actively rotating the crawler, and a crawler with a frame having a central roller set and lateral roller sets selectively engageable with a tubular target.


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    Titel :

    Improvement in or relating to crawlers


    Beteiligte:

    Erscheinungsdatum :

    2016-05-04


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



    IN OR RELATING TO CRAWLERS

    LAMONBY ROSS JAMES / STUTCHBURY NEIL WILLIAM | Europäisches Patentamt | 2016

    Freier Zugriff

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    Skid Steering of Crawlers

    Crosheck, James E. | SAE Technical Papers | 1975