Installation method of plastic blind flange for pipe protection
An installation method and technology of blind flanges, which are applied in the direction of flange connections, pipes/pipe joints/fittings, passing components, etc., can solve problems such as nuts cannot be removed, management is difficult, bolts, nuts, blind flanges are damaged, etc. Achieve the effects of low difficulty in management and use, uniform moment area, and extended service life
Active Publication Date: 2019-07-05
HUDONG ZHONGHUA SHIPBUILDINGGROUP
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Problems solved by technology
[0003] 1. Due to the large number of blind flange specifications, there are also many bolt specifications that need to be used together, and the management is difficult
[0004] 2. It is difficult to ensure that the end of the bolt is flush with the nut after installation
Sometimes the bolts protrude from the nuts. In this case, after the painting operation, the threads at the ends of the bolts are stained with paint, so that the nuts cannot be removed when the blind flange needs to be removed in subsequent work.
Sometimes in order to disassemble the blind flange, the bolts are cut off by means of gas cutting, which causes damage to the bolts, nuts and blind flanges, resulting in waste
[0005] 3. Since the bolts and nuts are made of steel, they are heavy, inconvenient to recycle and costly
After calculation, if the number of screw holes of the pipe flange and the blind flange are the same, and the pitch circle diameter of the screw holes differs by 5mm, it can be installed with a smaller bolt. However, due to the misalignment of the screw holes, sometimes the hexagon head of the bolt and the nut cannot be completely covered. Screw holes, resulting in uneven tightening torque, which affects the installation protection effect of some blind flanges
Method used
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[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0037] A method for installing a plastic blind flange for pipe protection, comprising the following steps:
[0038] Step 1. The blind flange is installed on the pipe flange: one or two bolts and nuts can be used for positioning (horizontal, downward opening flange). Generally, the positioning bolts are installed in the upper screw holes of the flange, such as the blind flange and the flange. If there is a deviation in the outer diameter of the pipe flange, adjust one end of the blind flange to be flush with the pipe flange, and then tighten the positioning bolts (the positioning bolts may not be installed on the open flange facing the sky).
[0039] Step 2. Locate the double-hole flat washer: After inserting a double-hole washer into the lead wire, pass it through the screw hole of the flange, and then pass through the other double-hole washer to ensure...
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The invention discloses an assembly method of plasticblank flange for pipe protection. The steps of the method comprises installing a blank flange on a flange of pipes, locating a double-hole plain washer, installing the double-hole plain washer, dismantling the blank flange. The method has the advantages of improving the utilizing effects, prolonging the life and enhancing the recyclingextent of theplasticblank flange, reducing the installation material cost and the waste utilizing bolts and nuts in prior technology.
Description
technical field [0001] The invention relates to the cleaning and protection of pipe production and installation stages in the field of ships, in particular to a method for installing plastic blind flanges for pipe protection, which is used for sealing of ship pipes after processing and segmental pre-outfitting. Background technique [0002] In the past, after the pipe was pre-outfitted in sections, before entering the paint shop for sand washing, the plastic blind flange (hereinafter referred to as "blind flange") was installed on the end flange of the pipe with steel bolts and nuts, and good results were obtained. The protective effect greatly improves the cleaning quality of the piping system. But at the same time, there are the following disadvantages in the blind flange installation method: [0003] 1. Due to the large number of blind flange specifications, there are also many bolt specifications that need to be used together, making management difficult. [0004] 2. I...
Claims
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IPC IPC(8): F16L23/024F16L23/18
CPCF16L23/024F16L23/18
Inventor 陈琰黄华兵刘希权
Owner HUDONG ZHONGHUA SHIPBUILDINGGROUP