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A method for manufacturing anti-corrosion pipe fittings with large and small heads

A production method and technology of large and small heads, which are applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc., can solve the problems of unsatisfactory use effect, shortened service life, prone to cracks, etc., and achieve extended service life and extended use. Long life, good flame retardant effect

Active Publication Date: 2017-03-01
ZHEJIANG BOWEI STEEL STRUCTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In petrochemical enterprises, anti-corrosion transportation pipelines are more and more widely used. Due to the arrangement of on-site equipment and the design of pipeline flow, some small and large heads are used to connect pipelines of different sizes at some pipeline interfaces. They are all corrosive liquids and gases. Although anti-corrosion manufacturers have made a lot of efforts and achieved some results, the actual use effect is not satisfactory. Because the size of the inlet and outlet is different, the strength of corrosion at both ends is different. Therefore, cracks are prone to occur, which will quickly corrode the steel parts and cause the pipe fittings to be scrapped. Generally, oil transportation pipelines are outdoors for a long time, and most of them are steel products. They are prone to rust and shorten their service life after being exposed to wind and rain; The manufacturing method can provide comprehensive protection for the big and small heads, so as to prolong the service life of the pipe fittings

Method used

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  • A method for manufacturing anti-corrosion pipe fittings with large and small heads
  • A method for manufacturing anti-corrosion pipe fittings with large and small heads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 (DN20-DN50 size head)

[0037] As shown in the figure, the manufacturing method of a kind of anti-corrosion pipe fittings described in this embodiment includes the following steps:

[0038] (1) Production of big and small heads

[0039] a: Prepare the size head body and the corresponding flange. The size head is a stamped part with a wall thickness ≥ 6mm. The flange is a plate type flat welding flange. Remove the burrs and dirt on the size head body. Weld the flange with the same size, use secondary welding as the base, and weld the cover with electrode arc welding. The two ends of the big and small head body are indented 2mm from the outer plane of the flange;

[0040] b: After the welding is completed, inspect the weld seam, there must be no air holes, interlayers, cracks, and the outer side of the flange center hole and both ends of the big and small heads are ground into rounded corners;

[0041] c: Send the big and small heads into the tempering furnace...

Embodiment 2

[0057] Example 2 (DN50-DN200 size head)

[0058] As shown in the figure, the manufacturing method of a kind of anti-corrosion pipe fittings described in this embodiment includes the following steps:

[0059] (1) Production of big and small heads

[0060] a: Prepare the size head body and the corresponding flange. The size head is a stamped part with a wall thickness ≥ 6mm. The flange is a plate type flat welding flange. Remove the burrs and dirt on the size head body. Weld the flange with the same size, use secondary welding as the base, and weld the cover surface with electrode arc welding. The two ends of the size head body are indented 5mm from the outer plane of the flange;

[0061] b: After the welding is completed, inspect the weld seam, there must be no air holes, interlayers, cracks, and the outer side of the flange center hole and both ends of the big and small heads are ground into rounded corners;

[0062] c: Send the big and small heads into the tempering furnace...

Embodiment 3

[0078] Example 3 (DN200-DN500 size head)

[0079] As shown in the figure, the manufacturing method of a kind of anti-corrosion pipe fittings described in this embodiment includes the following steps:

[0080] (1) Production of big and small heads

[0081] a: Prepare the size head body and the corresponding flange. The size head is a stamped part with a wall thickness ≥ 6mm. The flange is a plate type flat welding flange. Remove the burrs and dirt on the size head body. Weld the flange with the same size, use secondary welding as the base, and weld the cover surface with electrode arc welding. The two ends of the big and small head body are indented 8mm from the outer plane of the flange;

[0082] b: After the welding is completed, inspect the weld seam, there must be no air holes, interlayers, cracks, and the outer side of the flange center hole and both ends of the big and small heads are ground into rounded corners;

[0083] c: Send the large and small heads into the tempe...

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Abstract

The invention discloses a method for manufacturing a corrosion prevention reducer pipe fitting. The method includes the procedures of reducer manufacturing, sand blasting, reducer outer layer rust prevention treatment, reducer inner layer machining, reducer outer layer coating and checking and storage. The pipe fitting machined in the manufacturing method is attractive in appearance like artware, the inside of a reducer is high in structural stability and is resistant to corrosion of various chemical media, the outer layer of the reducer is waterproof and rust-proof, the service life of the pipe fitting is prolonged by 2-3 times, and the pipe fitting is convenient to connect, safe in use and free from environment pollution; in addition, the pipe fitting can be improved at existing manufacturers, equipment does not need to be added, and the pipe fitting is economical and practical, high in popularization and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of pipe fitting processing, and in particular relates to a method for manufacturing anti-corrosion pipe fittings with large and small heads. Background technique [0002] In petrochemical enterprises, anti-corrosion transportation pipelines are more and more widely used. Due to the arrangement of on-site equipment and the design of pipeline flow, some small and large heads are used to connect pipelines of different sizes at some pipeline interfaces. They are all corrosive liquids and gases. Although anti-corrosion manufacturers have made a lot of efforts and achieved some results, the actual use effect is not satisfactory. Because the size of the inlet and outlet is different, the strength of corrosion at both ends is different. Therefore, cracks are prone to occur, which will quickly corrode the steel parts and cause the pipe fittings to be scrapped. Generally, oil transportation pipelines are outdoors for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B29C41/08B24C1/10F16L9/147F16L23/026F16L58/10
CPCB21C37/16
Inventor 盛雷军王有路
Owner ZHEJIANG BOWEI STEEL STRUCTURE