Underwater reinforcement method for welding neck flange
A reinforcement method and flange technology, which is applied to flange connections, pipes/pipe joints/fittings, passing components, etc., to reduce the difficulty of replacement and the effect of construction costs
Active Publication Date: 2015-10-28
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology
[0003] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and to provide an underwater strengthening method for weld neck flanges, which not only enables the use effect of low-weight flanges to It is equal to or close to the high-pound flange, which solves the problem of how to strengthen and upgrade the original weld neck flange that cannot be replaced underwater to match with the high-pound flange, and greatly reduces the cost of the original subsea flange. The difficulty of replacement and construction costs and other issues
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[0026] Such as Figure 1 to Figure 8 As shown, the present invention adopts the following strengthening steps:
[0027] The first step: investigate and test the original flange 3 that needs to be strengthened underwater, and at the same time, clean up the aquatic organisms and rust stains around the original flange 3, and make an investigation report.
[0028] Step 2: Reinforce the design and manufacture of the original flange 3 that needs to be strengthened
[0029] According to the investigation report, project requirements and relevant technical specifications, carry out detailed design for the reinforcement of the original flange 3; and process and manufacture the reinforcement flange 6 for the original flange 3 according to the relevant information such as design drawings and technical requirements .
[0030] Such as figure 1 — figure 2 As shown, the reinforcing flange 6 is composed of two parts connected by the welding neck flange 1 and the flange jacket 2, wherein ...
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An underwater reinforcement method for a welding neck flange includes the following reinforcement steps that firstly, an existing flange which needs to be reinforced underwater is checked, detected and cleaned, and a survey report is made; secondly, the existing flange which needs to be reinforced is designed in a reinforced manner, and the reinforced flange is manufactured; thirdly, a short pipe is prefabricated, and the welding neck flange of the reinforced flange and an ordinary flange are arranged at the two ends of the short pipe; and fourthly, a flange jacket of the reinforced flange is arranged on the existing flange which needs to be reinforced; fifthly, the prefabricated short pipe is connected with a crane, the short pipe is hung to the underwater portion, one end of the welding neck flange in the reinforced flange is connected with the flange jacket to form the reinforced flange, and finally the existing flange is reinforced. By reinforcing the low-class flange, the use effect of the low-class flange can be the same as or close to that of a high-class flange, and the purpose of reinforcing and upgrading the existing welding neck flange which can not be replaced underwater and making the existing welding neck flange and the high-class flange used in pair is achieved.
Description
technical field [0001] The invention relates to flanges, in particular to an underwater strengthening method for low-weight welding neck flanges that are original on the seabed and are not easy to replace. Background technique [0002] During the underwater flange connection operation, if the two butt flanges have different pounds and cannot be matched, the first thing to consider is to replace the flanges, and generally choose to replace the method with a lower pound. Lan, this will often increase the construction volume and construction difficulty to a large extent, and, while increasing the project cost, it will also increase the construction period. If, when the flange with a lower pound class cannot be replaced, and the flange with a higher pound class is replaced with a flange matching the lower class flange, the flange connection cannot meet the design requirements, which will greatly Affect the use effect and life of underwater structures. Contents of the inventio...
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IPC IPC(8): F16L23/024F16L23/032
CPCF16L23/024F16L23/032
Inventor 梁超陈晓明刘贞飞贺辰
Owner CHINA NAT OFFSHORE OIL CORP