Nuclear power plant seawater system pipe branch pipe butt welding conversion joint
A technology for seawater systems and conversion joints, applied in the direction of pipes/pipe joints/fittings, non-detachable pipe connections, passing components, etc., can solve problems such as multiple corrosions, avoid the risk of corrosion and perforation, and eliminate the effect of seawater corrosion problems
Inactive Publication Date: 2017-05-31
CNNC NUCLEAR POWER OPERATION MANAGEMENT +1
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0015] Such as figure 1 As shown in the figure, a butt-welding transition joint of the branch pipe of the seawater system of the nuclear power plant is a hollow columnar structure as a whole, which is divided into two cylindrical sections and three conical sections. From left to right are the first cylindrical section and the first conical section. , the second cylindrical section, the second conical section and the third conical section, the above-mentioned sections are coaxial and have the same inner diameter. The first cylindrical section is connected with the main pipeline of the seawater system of the nuclear power plant. The left end of the first conical section is the small end, the right end is the large end, the outer diameter of the small end is equal to the outer diameter of the first cylindrical section, and the outer diameter of the large ...
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Abstract
The invention belongs to the technical field of nuclear power station operation and maintenance, in particular, relates to a nuclear power plant seawater system pipe branch pipe butt welding conversion joint, and aims to provide a butt welding conversion joint for compensating the welding strength of a stainless steel or nickel base alloy pipe with a nominal diameter of NPS 2 or below DN 50 and a wall thickness of SCH 160. The joint is characterized being an overall hollow cylindrical structure; the joint is divided into two cylinder sections and three cone sections: a first cylinder section, a first cone section, a second cylinder section, a second cone section and a third cone section in sequence from left to right; and all the sections are coaxial, and are the same in inner diameter. The nuclear power plant seawater system pipe branch pipe butt welding conversion joint satisfies B31.1 code requirements, performs the strength compensation for the welding strength of the stainless steel or nickel base alloy pipe with the nominal diameter of NPS 2 or below DN 50 and the wall thickness of SCH 160, and meanwhile, eliminates the seawater corrosion problem in the structure.
Description
technical field [0001] The invention belongs to the technical field of operation and maintenance of nuclear power plants, and in particular relates to a butt-welding conversion joint of branch pipes of a seawater system pipeline of a nuclear power plant. Background technique [0002] Seawater system and an important part of nuclear power plants are directly related to the safe operation and power generation efficiency of nuclear power plants. [0003] In the pipeline system, there are multiple branch pipes below NPS 2 or DN50 welded to the main seawater pipeline. For power plants designed according to the American Standard Power Piping Code ASME B31.1 (this article is based on the 2010 version), the design pressure of the seawater system is less than 150LB. The wall thickness grade of the branch pipe below NPS 2 or DN50 is SCH40 grade. [0004] According to the provisions of 127.4.8(F) and 127.4.8(G) in B31.1, the connection between the branch pipe and the main pipe needs ...
Claims
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Login to View More IPC IPC(8): F16L13/02
CPCF16L13/02
Inventor 龚代涛胡建群王欣江锋薛新才
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT