Pipeline air tightness detection assembly and air tightness detection method

An air tightness detection and pipeline technology, which is applied in the direction of liquid tightness measurement using liquid/vacuum degree, and by measuring the increase and deceleration rate of the fluid, can solve the problems of laborious, difficult to find the negative pressure of the suction pipeline, and time-consuming, etc. , to achieve the effect of improving construction quality and work efficiency, reducing the cost of leak detection and shortening the time of leak detection

Pending Publication Date: 2022-07-29
JIANGNAN SHIPYARD GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can only detect the possibility of air leakage in the pipeline when the same pressure is injected into the pipeline at normal room temperature; The flange will expand when heated, and it is difficult to ensure that there will be no steam leakage at the joint
[0009] 2) Difficult to spot
If a large amount of soapy water is sprayed, it will cause water vapor to form "white smoke", and it is difficult to observe air leakage
[0010] 3) Not safe
Use the flame of a candle to check whether there is any steam leakage at the connection, which is a potential safety hazard; because many parts of the ship are flammable materials, and many cabins have a strong smell of paint, the concentration coefficient of explosives is high, and the pipelines on the ship are covered with heat insulation Cotton, no open flames
[0011] 4) Larger external influence
The situation in the engine room on the ship in the later stage is complicated. The temperature of the engine room is high, and various ventilation and refrigeration equipment need to be operated, otherwise it is easy to cause heat stroke. examiner's judgment
[0012] 5) Time-consuming and labor-intensive
Due to thermal expansion and contraction of high-temperature and high-pressure pipelines, it is difficult to completely solve the steam leakage situation at one time, and it takes a lot of time to check for leaks repeatedly
[0013] 6) Error prone
Larger and smaller steam leaks in the pipeline cannot be observed with the naked eye and cannot be ruled out. Larger steam leaks will produce harsh sounds; since all equipment is in operation during the debugging stage, high-temperature and high-pressure steam circulating in the pipeline will also produce harsh sounds The noise in the engine room is very loud and loud, and it is difficult to distinguish the specific location of the steam leakage; the steam leakage at a higher temperature may cause burns when people approach without paying attention
[0014] 7) If it does not meet the requirements for use, it will cause pollution in the pipeline
Because the condensed water entering the boiler has been deoxidized and deionized before generating steam, and the pipeline needs to be specially treated, pickled, and then purged with steam, so the general water injection pump pressure does not meet the use requirements, which is likely to cause pipeline failure. There are other harmful substances in the pipeline. If water containing ions remains in the pipeline, it will directly enter the boiler and cause boiler fouling, which will affect the service life and steam production of the boiler.
[0015] 8) It is difficult to find the negative pressure in part of the exhaust pipeline
Due to the negative pressure in the air extraction pipeline of the steam seal extractor and the main air extractor, the maximum pressure of -0.096Mpa can be generated during operation, which is far lower than the normal atmospheric pressure of 0.1Mpa, and the air leakage is sucked into the pipeline. It is difficult to find, the temperature of the pipeline is high during work, and it is impossible to find out the specific leak by conventional methods

Method used

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  • Pipeline air tightness detection assembly and air tightness detection method
  • Pipeline air tightness detection assembly and air tightness detection method
  • Pipeline air tightness detection assembly and air tightness detection method

Examples

Experimental program
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Embodiment 1

[0070] This embodiment provides a pipeline air-tightness detection assembly, the pipeline air-tightness detection assembly includes a sealing sleeve and an air-tightness detection device communicated with the sealing sleeve, wherein the sleeve joints are located at both ends of the sealing part, The sealing part forms an accommodating cavity, when the air tightness of the pipeline is detected, the sealing sleeve is sealed and sleeved on the pipeline through the sleeve joint part, and the position to be detected of the pipeline is located in the accommodating cavity; the air tightness detection device is communicated with the accommodating cavity, to detect changes in air pressure within the gland.

[0071] Specifically, refer to figure 1 or figure 2 , the sealing sleeve 1 includes an upper half 11 and a lower half 12, the upper half 11 includes a first raised portion 111 and a first pipe fitting portion 112 located at both ends of the first raised portion 111, and the lower ...

Embodiment 2

[0075] The present embodiment provides an air tightness detection method, comprising the following steps:

[0076] S101: Set up a pipeline air-tightness detection component at a position to be detected of the pipeline, wherein the pipeline air-tightness detection component is the pipeline air-tightness detection component described in any one of the above-mentioned Embodiment 1;

[0077] The steps for lining the pipeline air tightness detection component at the position to be tested are as follows:

[0078] 1) Refer to figure 1 , before use, take out the upper half 11 and the lower half 12, and fit the first gasket 51 to the connecting flange 14 of the upper half 1 and the edge of the first pipe fitting part 112 (that is, the upper half 1 and The sealing connection of the lower half part 2), place the second gasket 52 at the connecting flange 14 of the lower half part 12 and the edge of the second pipe fitting part 122 (ie the upper half part 1 and the lower half part 2). se...

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Abstract

The invention discloses a pipeline air tightness detection assembly and an air tightness detection method, the pipeline air tightness detection assembly comprises a sealing sleeve and an air tightness detection device connected with the sealing sleeve, the sealing sleeve comprises a sealing part and sleeving parts, the sleeving parts are located at the two ends of the sealing part, the sealing part forms a containing cavity, and when the air tightness of a pipeline is detected, the sleeving parts are located in the containing cavity. The sealing sleeve is hermetically sleeved on the pipeline through the sleeving part, so that a to-be-detected position of the pipeline is positioned in the accommodating cavity; the air tightness detection device is communicated with the containing cavity so as to detect the air pressure change in the sealing sleeve. According to the invention, the pipeline joint is sealed by the sealing sleeve, and the air pressure change in the sealing sleeve is detected by the air tightness detection device, so that whether the pipeline joint leaks air or not is judged, the problem of high difficulty in detecting the tightness of the high-temperature and high-pressure pipeline in the prior art can be effectively solved, and the construction quality and the working efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of air-tightness detection of pipelines in ships, in particular to a pipeline air-tightness detection component and an air-tightness detection method. Background technique [0002] After the ship is built, the pipeline needs to be tested for pump pressure leaks. However, the pipelines in steam-powered ships are special pipelines. The working pressure of steam in the pipelines can reach up to 5.6Mpa or more during operation, and the temperature is around 450℃, which has the characteristics of high temperature and high pressure. The pipeline pressure of the air extractor system in steam-powered ships is negative pressure (the maximum pressure of -0.096Mpa can be generated during operation). Negative pressure is very important in the entire steam-powered system, and there is a chain relationship between various equipment. , the entire steam power system is a dynamic balance, if the negative pressure does not m...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01M3/28
CPCG01M3/2815
Inventor肖亮李永磊毛伟洪亮王钧程建国叶毅
OwnerJIANGNAN SHIPYARD GRP CO LTD