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Bending equipment of urea-level stainless steel pipe and bending method

A stainless steel tube, urea grade technology, applied in the field of 316Lmod pipeline processing of petrochemical urea plant, can solve the problem of high cost

Inactive Publication Date: 2012-03-21
湖南四化建高压阀门管件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 316Lmod pipelines used in my country's urea stripping unit are all composed of imported standard parts, elbows and accessories, and the cost is very high

Method used

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  • Bending equipment of urea-level stainless steel pipe and bending method
  • Bending equipment of urea-level stainless steel pipe and bending method
  • Bending equipment of urea-level stainless steel pipe and bending method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] Example: Take the 10″φ273.1×25.4 316Lmod 90°R=5D=1270 standard elbow as an example.

[0086] 1. Incoming material inspection:

[0087] 1. Check whether the mark on the pipe is φ273.1×25.4, and whether the material mark, furnace number, and batch number are consistent with the list of incoming materials.

[0088] 2. Measure the length, outer diameter and wall thickness of the pipe (using an ultrasonic thickness gauge).

[0089] 2. Production:

[0090] The production adopts cold bending, and all the production processes adopt effective means to isolate the carbon steel and control the ferrite content.

[0091] (1) This specification needs to use the extension pipe to bend the standard bend (American standard)

[0092] 1. Calculate φ273.1×25.4 90°R=5D=1270. The standard elbow development length is 1995mm, and the shortest length of the elbow bending is 1995+200=2195mm, due to the need for appropriate processing allowance and removal of ferrite Exceeding part;

[0093]...

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Abstract

The invention relates to bending equipment of a urea-level stainless steel pipe and a bending method, wherein the bending equipment comprises a pushing part A, a bending part B, a pulling part C and a shaping device of the end part of a molded bending pipe, wherein the pushing part A, the bending part B, the pulling part C are arranged on a steel plate of a reinforced concrete foundation, wherein an oil cylinder of the pushing part A abuts against the tail end of the bent steel pipe inserted on the bending part B and pushes the bent steel pipe to move forwards; the pulling part C controls a steel wire rope to pull a rotating disc and a pipe bending mold to rotate by a winch, so as to carry out bending on the clamped and bent steel pipe; and the pushing part A and the pulling part C work synchronously to carry out push-pull type bending operation or only the pulling part C is started to carry out pure-pull type bending operation. The bending method comprises the following steps of: 1) material detection; 2) preparation work before bending; 3) pipe bending; 4) detection after out of the mold; 5) shaping of the end part of the bending pipe; 6) machining of a bending pipe facing machine; 7) detection; 8) acid cleaning and passivation; and 9) packaging and warehousing. Due to adoption the invention, the foreign imported product can be replaced, the purchasing period is shortened and the cost is reduced.

Description

technical field [0001] The invention relates to a 316Lmod pipeline processing technology of a petrochemical urea plant, in particular to a bending equipment and a bending method of a urea-grade stainless steel pipe. Background technique [0002] 316Lmod urea grade ultra-low carbon stainless steel is an improved material of 316L, which is commonly used as high-pressure pipeline material of petrochemical urea plant. The urea plant has the characteristics of high temperature, high pressure, flammability, explosion, and corrosion. The maximum working pressure is 15 MPa, and the maximum working temperature is 385°C. The main working medium is highly corrosive substances such as methylamine, urine, and liquid ammonia. . Among them, the most corrosive medium is methyl ammonium solution under high temperature and high pressure, which has strong intergranular corrosion ability to stainless steel. When the ultra-low carbon stainless steel (316lmod) with a carbon content of less than...

Claims

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Application Information

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IPC IPC(8): B21D7/08
Inventor 刘珲熊光辉宋尧刘松柏陈冬连陈定波
Owner 湖南四化建高压阀门管件有限公司
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