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Seal and actuator for pipe testing
| Details |
Inventors: Covey, III, George H.; Stenabaugh, Donald D.;
Assignee: The Presray Corporation (Pawling, NY)
Primary Examiner: Queisser; Richard C.
Assistant Examiner: Roskos; Joseph W.
Attorney, Agent or Firm: Mandeville and Schweitzer
In an apparatus for pressure testing open-ended pipes or the like there is provided a novel sealing means to form an air-tight seal between the open end of a pipe to be tested and an end plate of a pipe supporting test fixture. The sealing means comprises a continuous, annular, yieldable sealing member of triangular cross-section supported on the end plate. A pneumatically expandable annular actuator is associated with the continuous sealing member. The sealing member is normally spaced radially and axially from the junction area of the pipe end and test fixture end plate. The pneumatically inflatable actuator is operative to expand the continuous yieldable sealing element radially and simultaneously to advance it longitudinally, whereby the triangular sealing member is tightly wedged into said junction area to form a preliminary seal. When test pressure is applied, it acts upon the triangular sealing member to increase the seal effectiveness. |
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DETAILED DESCRIPTION The present invention is related to the pressure testing of open-ended large diameter pipes.
After the manufacture of a section of large diameter welded pipe, for example, the pipe is typically subjected to pressure testing in order to determine whether the section has been properly formed and is air tight.
The pipe section is mounted between end plates of two opposed test fixtures, which support the pipe and form an air tight seal at the open ends thereof.
Pressurized air is then pumped into the interior of the tubing or pipe.
Tests may then be conducted to determine whether any air is leaking from the pipe interior to the surrounding atmosphere.
In testing apparatus of the general type described above, it is important that the pipe be easily mounted on the test fixture and that a leak-tight seal at the junction of the pipe under testing and the test fixtures be readily formed.
Further, it is of significance that the testing procedure require no mechanical attachments and that it be non-damaging to the pipe, so that fiberglass, non-ferrous and similar pipes can be accommodated, as well as steel pipes.
It is an object of the present invention to provide an improved and more effective sealing means to be mounted at the end plates of test fixtures of the type being referred to.
The sealing means is adapted to be operable upon the placement of an open end of the pipe to be tested in abutting relation to the end plate, to form an efficient air-tight seal.
In its broadest scope, the present invention provides a continuous yieldable, radially expandable sealing member at each end plate.
Each sealing member is adapted to be expanded so as to be tightly received into the junction area between the open end of the pipe and the complimentary test fixture end plate.
Novel, pneumatically expandable actuator means is associated with each sealing member and is also supported on the circular end plates of the test fixtures.
The sealing member and actuator means are so arranged on the end plate that the sealing member is normally spaced from the junction area along an angular axis
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