Pipe joints or couplings – With fluid pressure seal – With external pressure supply
Patent
1994-10-11
1997-01-21
Arola, Dave W.
Pipe joints or couplings
With fluid pressure seal
With external pressure supply
2853827, 285417, 285 97, F16L 1700
Patent
active
055954057
DESCRIPTION:
BRIEF SUMMARY
The Present invention is related to a diaphragm power jack and a method of utilizing same.
In numerous situations within many fields efforts have been made to increase a distance between two parts in a quick and efficient way. Such a situation occurs when two flanges which have been clamped together, are to be loosened. In such case one of the flanges should be moved away from the other or even both flanges should be axially displaced.
In many other cases the aim is to remove or displace only one of the parts between which a gap exists. This is the case by partitioning a subject into smaller parts which is the case in stone quarries, when removing a concrete outer layer from a pipe, etc.
The need for a small and effective tool to provide a very strong force in a selected direction, substantially without loss of energy in other directions will increase productivity and the accuracy of the performance substantially.
In connection with repairs of pipelines of the above mentioned type a considerable amount of time is used for removing the outer concrete layer to give accessibility to the pipe itself for repairs maintenance or modifications. It is in fact known to cut tracks in the concrete around the exterior circumference and likewise longitudinal cuts whereby hydraulic tools are used to press the sections apart in a tangential direction, resulting in braking the concrete out in small pieces.
The forces from the tool may be released between parallel flat or cylindric sheets. The forces will be directed perpendicularly to the plane of the flat sheets or perpendicularly or radially to the cylindric plane of cylindric sheets. In the latter case the direction is radially inwardly from a stronger outer cylinder or radially outwardly from a stronger inner cylinder, of which the first case will be a clamping operation.
Repair of pipelines on difficult accessible places, such as at the sea bed, is time consuming and in many ways very difficult if repair work is to be made by welding. A ruptured pipeline usually is cut and a new portion inserted which portion thereafter has to be welded to the pipeline at both ends.
The method and tool according to the present invention very efficiently solve the above mentioned problem operations in the above mentioned application fields as well as others by concentrating the force input almost completely to the desired force direction, perpendicularly to the sheets, if plane or cylindric, the direction being linear or radial.
The above mentioned objectives are achieved with the method and tool according to the present invention as defined with the features stated in the patent claims.
In the drawing
FIG. 1 in a cross sectional way schematically discloses the tool according to the present invention before use and
FIG. 2 discloses the same tool after use, in an expanded position,
FIG. 3 discloses the tool in FIGS. 1 and 2 in a side view,
FIG. 4 discloses schematically the method for cutting a section of a concrete layer around a pipe line out by means of the tool according to the present invention,
FIG. 5 discloses the principle for removing flanges from each other by means of the present invention,
FIG. 6 discloses schematically in an axial section the tool according to the present invention in the shape of a cylinder for provision of radial forces,
FIG. 7 discloses an enlargement of a detail from FIG. 6,
FIG. 8 discloses a longitudinal section through a tool for connection of two pipes before the operation,
FIG. 9 discloses a cross section from FIG. 10,
FIG. 10 discloses a longitudinal section corresponding with FIG. 8, however after the clamping operation,
FIG. 11 discloses rock breaking by means of the diaphragm power jack according to the invention and
FIG. 12 discloses an alternative method for manufacturing the plane power jack.
FIG. 4 discloses one application field for the present invention, namely part of a pipe line 9 embedded in a concrete layer such as an oil pipe arranged on a seabed. In cases where repairs, maintenance or inspection must be performed on the pipeline, th
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Arola Dave W.
OBS Technology A/S
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