Abstract:
Apparatus for spraying maintenance enhancing material onto the periphery of a tubular member positioned above a ground surface, that comprises means for generating spray onto the periphery of the tubular member; means for delivering maintenance enhancing material to the spray generating means; and means for positioning the spray generating means in such a way that the periphery of the tubular member is completely impinged by the spray issuing from each spray generating means and that a line corresponding to the shortest distance of a spray issuing from the spray generating means to the periphery of the tubular member is not necessarily colinear with the radius of the tubular member.
Abstract:
Apparatus for lifting and supporting pipelines through which is flowable fuel, gas or hazardous industrial liquids, for maintenance and restoration purposes, which comprises a hybrid sling for supporting a pipeline segment when being raised, where the sling comprises a flexible belt portion contacting an underside of the pipeline segment and a chain portion vertically extending from each end of the belt portions to an element through which a lifting force is transmittable. The sling is assured of being sufficiently structurally strong and dimensionally stable to ensure that the difference in height of any two points of the segment when being raised is not so great as to create a danger to the integrity of the pipeline.
Abstract:
Apparatus for spraying maintenance enhancing material onto the periphery of a tubular member positioned above a ground surface, that comprises means for generating spray onto the periphery of the tubular member; means for delivering maintenance enhancing material to the spray generating means; and means for positioning the spray generating means in such a way that the periphery of the tubular member is completely impinged by the spray issuing from each spray generating means and that a line corresponding to the shortest distance of a spray issuing from the spray generating means to the periphery of the tubular member is not necessarily colinear with the radius of the tubular member.
Abstract:
Apparatus for the lifting of pipelines, includes a frame having two vertical side beams and a transverse top beam interposed between the vertical beams. Two concave and symmetrically disposed supporting members pivotally connect to the two vertical beams, respectively, and are configured to achieve a pipe supporting position without applying a radial inwardly directed force to the bottommost portion of the pipe when the frame is suitably lowered and the supporting members are suitably pivoted. A driving unit is disposed within, and fixedly attached to, each of the supporting members, for generating a linear downwardly directed force; a force transmitting element connected to a driving unit rod along which a corresponding driving unit housing is slidingly displaceable. A control unit independently controls each of the driving units; and at least one connector releasably connects the two supporting members to one another when the supporting members are in a pipe supporting position. The control unit is adapted to immobilize the force transmitting elements against a trench bed in a pre-lifting mode when a first force is generated by the driving units, and to lift each of the driving unit housings together with the corresponding supporting member with respect to the corresponding force transmitting element in a lifting mode when a suitable second force greater than the first force is generated by each of the driving units.
Abstract:
Method and apparatus for the maintenance of pipelines. The method includes selecting a number of points along the pipeline and raising the pipeline at these points by an amount that the height difference between these points does not exceed the international flexibility standards. The apparatus includes at least one lifting frame, telescopic lifting arms and a flexible device connected to the lifting arms for engaging the pipeline.
Abstract:
Apparatus for the lifting of pipelines, includes a frame having two vertical side beams and a transverse top beam interposed between the vertical beams. Two concave and symmetrically disposed supporting members pivotally connect to the two vertical beams, respectively, and are configured to achieve a pipe supporting position without applying a radial inwardly directed force to the bottommost portion of the pipe when the frame is suitably lowered and the supporting members are suitably pivoted. A driving unit is disposed within, and fixedly attached to, each of the supporting members, for generating a linear downwardly directed force; a force transmitting element connected to a driving unit rod along which a corresponding driving unit housing is slidingly displaceable. A control unit independently controls each of the driving units; and at least one connector releasably connects the two supporting members to one another when the supporting members are in a pipe supporting position. The control unit is adapted to immobilize the force transmitting elements against a trench bed in a pre-lifting mode when a first force is generated by the driving units, and to lift each of the driving unit housings together with the corresponding supporting member with respect to the corresponding force transmitting element in a lifting mode when a suitable second force greater than the first force is generated by each of the driving units.
Abstract:
Method and apparatus for the maintenance of pipelines. A number of points along the pipeline is selected and the pipeline is raised at these points by an amount that the height difference between these points does not exceed the international flexibility standards. The pipeline is supported at these points and thereafter maintenance is performed on those segments which have been raised enough to allow performance of the maintenance procedures. The distance between two adjacent points may be 30 meters and the height difference between two adjacent points may be not more than and preferably close to 22 cm. The initial cross-section of the selected segments are allowed to rest on the beds of the trenches because of their weights.