Pipes and tubular conduits – Repairing
Patent
1976-02-02
1977-08-16
Shapiro, Jacob
Pipes and tubular conduits
Repairing
29401R, 138 97, 285 18, 285 27, F16L 100
Patent
active
040417204
ABSTRACT:
A method of installing a spool between misaligned underwater pipeline sections to effect connection thereof, as in the repair of a pipeline, the hook-up of a riser flow pipe to an underwater pipeline, or the connection of two underwater pipelines, is disclosed. The method is based upon the precise determination of the spatial relation between the pipe ends and the determination of an angle of entry of the spool in a direction to avoid binding between the pipe and spool ends. The method involves placement of guides defining surfaces extending beyond the perimeter of both the pipe and spool ends which define the direction of entry of the spool between the pipe ends and protect the surfaces from damage. The manner of placement of the guide surfaces is determined when the spool is constructed, so that once the spool is lowered underwater, the angle of entry can be readily perceived by aligning the guide surfaces. This minimizes the necessity for orientation of the spool underwater. The guide surfaces may be oriented to permit insertion of the spool at angles as much as 180.degree. apart. Accordingly, an angle of entry which facilitates insertion from a direction generally above the pipeline ends can often be found.
To provide assistance in properly orienting the spool for installation, mechanical guides for attachment to the pipe and spool ends are disclosed. The mechanical guides include mating quide pieces that engage to fix the orientation of the spool with respect to the pipelines and maintain the spool and pipe ends in the proper relationship as the spool is moved into position. Further disclosed is an alignment apparatus for handling the fabricated spool at the installation location and a flange for use on the spool ends.
REFERENCES:
patent: 3260539 (1966-07-01), Herron
patent: 3558161 (1971-01-01), Bormioli
patent: 3603617 (1971-09-01), Lochridge
patent: 3658366 (1972-04-01), Welch, Jr. et al.
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