CN203979895U - A test device for the sealing effect of pipeline under pressure - Google Patents

Abstract

A testing device for the under-pressure plugging effect of a pipeline belongs to the technical field of under-pressure plugging construction of pipelines. The funnel is connected with a water inlet valve through a pipeline, the other end of the water inlet valve is connected with a sealing cavity through a pipeline, the sealing cavity is connected with a high-precision pressure gauge, a water discharge valve and a balance hole nipple flange, the other end of the balance hole nipple flange is connected with a pipeline, and an upstream plugging device and a downstream plugging device are connected in the pipeline. The utility model has the advantages that: the testing device with the pressure plugging effect is butted with the balance hole nipple through a flange, so that the operation is more convenient; the pipe section is successfully replaced by filling the plugging pipe section with water; whether gas leaks into the pre-plugging pipe section from the plugging part or not can be judged through the change of the gas pressure of the sealed cavity in a short time. The aims of eliminating potential safety hazards and ensuring construction safety of blocking under pressure are achieved by determining the blocking effect.

Description

A test device for the sealing effect of pipeline under pressure

technical field

The utility model relates to a testing device for the sealing effect of pipelines under pressure, which belongs to the technical field of pipeline construction under pressure.

Background technique

Pipeline hot plugging technology is a safe, economical, fast and efficient special technology for maintenance and repair of in-service pipelines. It can complete the replacement, displacement, valve replacement and addition of branch lines without interrupting the medium transportation of the pipeline. It can also quickly and safely repair the accident pipeline and restore the operation of the pipeline when the pipeline leaks. Before the completion of the plugging operation of the pipeline and hot work, the plugging pipe section must be replaced and the effect of the plugging under pressure must be checked. The conventional detection method is to replace the plugging pipe section with nitrogen and check the plugging effect under pressure by the following methods: observe whether the pressure of the plugging pipe section changes and see if there is a pressure rise, manually monitor at the plugging point for air leakage, The sound of oil. Observing the pressure change of the plugged pipe section is due to the large volume of the pipe section, and the pressure increase is slow in the case of small leakage, so it takes a long time and the implementation efficiency is low. Manual monitoring at the blocking point is limited by the surrounding environment and it is difficult to detect small leaks, which affects the accuracy of judgment. Therefore, both methods have their own limitations when operating in the field.

Contents of the invention

In order to overcome the deficiencies of the prior art, the utility model provides a test device for the sealing effect of pipelines under pressure.

A test device for the sealing effect of pipelines under pressure, the funnel is connected to the water inlet valve through the pipeline, the other end of the water inlet valve is connected to the sealing cavity through the pipeline, and the sealing cavity is connected to a high-precision pressure gauge, a drain valve and a balance hole nipple method The other end of the balance hole nipple flange is connected to the pipeline, and the upstream occluder and downstream occluder are connected to the pipeline.

The beneficial effects of the utility model are: the testing device for the plugging effect under pressure is connected with the balance hole nipple through the flange, which makes the operation more convenient; the pipe section is filled with water to successfully replace the pipe section; the pipe section can be replaced in a relatively short period of time Judging whether there is gas leakage from the plugging place into the pre-blocking pipe section by the change of the gas pressure in the sealing cavity. By determining the plugging effect, the purpose of eliminating potential safety hazards and ensuring the safety of plugging under pressure is achieved.

Description of drawings

A more complete and better understanding of the invention, and many of its attendant advantages, will be readily appreciated by reference to the following detailed description when considered in conjunction with the accompanying drawings, but the accompanying drawings illustrated herein are intended to provide a further understanding of the invention , constituting a part of the utility model, the exemplary embodiment of the utility model and its description are used to explain the utility model, and do not constitute an improper limitation of the utility model, wherein:

Fig. 1 is the structural representation of the utility model.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Detailed ways

Obviously, many modifications and changes made by those skilled in the art based on the gist of the utility model belong to the protection scope of the utility model.

Embodiment 1: As shown in Figure 1,

A device for testing the plugging effect of pipelines under pressure, the funnel 1 is connected to the water inlet valve 2 through the pipeline, the other end of the water inlet valve 2 is connected to the sealing cavity 6 through the pipeline, and the sealing cavity 6 is connected to the high-precision pressure gauge 3 and the drain valve 4 and the balance hole nipple flange 5, the other end of the balance hole nipple flange 5 is connected to the pipeline, and the upstream occluder 7 and the downstream occluder 8 are connected to the pipeline.

During the process of pipeline sealing under pressure, when the upstream and downstream are completed, nitrogen replacement should be carried out and the plugging effect should be tested. The test device is implemented in this way: firstly, the test device is connected with the balance hole nipple through the balance hole nipple flange 5, then the water inlet valve 2 and the drain valve 4 are opened, and water is added through the funnel 1. At this time, the drain valve 4 acts as The function of exhaust, when the water fills the entire blocked pipe section and the water is discharged from the drain valve 4, close the water inlet valve 2 to stop the water addition operation, and then close the drain valve 4, and the pressure displayed on the high-precision pressure gauge 3 should be "Zero" gauge pressure. Stand still for 30 minutes. At this time, if the upstream occluder 7 and the downstream occluder 8 are not tightly blocked, the high-pressure gas of the upstream occluder 7 and the downstream occluder 8 will pass through the occluder and enter the plugging pipe section and from there When the water emerges and enters the sealed cavity 6, the indication value of the high-precision pressure gauge 3 will rise; if the upstream occluder 7 and the downstream occluder 8 are tightly sealed, the indication value of the high-precision pressure gauge 3 will not change. After 30 minutes, judge the effect of pressurized plugging by observing whether the indication value of the high-precision pressure gauge 3 changes.

In the field practice, the test device was used for the first time in the construction work of the hot-pressed plugging of Yingya LPG pipeline. The test device is convenient, trouble-saving and accurate for the test of the plugging effect, laying the foundation for the subsequent construction work.

A test device for the plugging effect of pipelines under pressure is composed of a funnel, a water inlet valve, a balance hole nipple flange, a sealing cavity, a high-precision pressure gauge, a drain valve, an upstream blocker, and a downstream blocker; its main The technical feature is that the test device for the plugging effect under pressure is connected with the balance hole nipple through the flange, and the test device for the plugging effect under pressure controls the water addition process through the funnel and the water inlet valve, and the drain valve can exhaust the water during the water addition process And judge whether the water is full. After filling up the water, close the water inlet valve and the drain valve to judge whether the blockage is tight through the high-precision pressure gauge.

The test device can also complete the replacement operation of the blocked pipe section, providing safety guarantee for the subsequent hot work.

As mentioned above, the embodiment of the present invention has been described in detail, but it is obvious to those skilled in the art that many modifications can be made as long as the inventive points and effects of the present invention are not substantially deviated from. Therefore, such modified examples are all included in the protection scope of the present invention.

Claims (1)

1. the testing apparatus of a pipe pressurized plugging effect, it is characterized in that funnel connects inlet valve by pipeline, the other end of inlet valve is by sealing for tubing joints cavity, sealed cavity connects high-precision pressure gauge, drain valve and equalizing orifice pipe nipple flange, the other end connecting line of equalizing orifice pipe nipple flange, connects upstream plugging device, downstream plugging device in pipeline.