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Field repair and remanufacturing process of pressure container

A pressure vessel and remanufacturing technology, applied in metal material coating process, heating inorganic powder coating, coating, etc., can solve the problems of difficult on-site repair, material damage, large tonnage, etc., and achieve easy cold welding repair, extension The effect of service life

Inactive Publication Date: 2016-08-03
苗西魁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pressure vessel generally consists of six parts: the cylinder, the head, the flange, the sealing element, the opening, the connecting pipe, and the support. It is mostly used in complex and harsh environments with high temperature, high pressure, and high corrosion. Various welding defects, structural defects, material defects, cracks, corrosion, wear, etc. during use, coupled with material damage caused by long-term extended service, are likely to cause brittle fracture, fatigue, corrosion, erosion, stress corrosion, and intergranular corrosion. And corrosion fatigue and other forms, once an accident occurs, it will bring extremely serious consequences
[0003] Due to the complex surface damage of pressure vessels, and the large scale, volume and tonnage of many pressure vessels, it is difficult to carry out on-site repairs. Therefore, a single repair process cannot solve the problem. Many pressure vessels need to be repaired by multiple processes to achieve work Condition requirements

Method used

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  • Field repair and remanufacturing process of pressure container
  • Field repair and remanufacturing process of pressure container
  • Field repair and remanufacturing process of pressure container

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Quench Tower Repair

[0032] Introduction: The main function is to rapidly cool the high-temperature tail gas from hydrogenation reduction. It was put into operation in April 2010. The equipment is about 28m high. The cylinder is made of composite plates rolled and welded, and the spherical heads at both ends are made by cold stamping. The parameters are shown in Table 1:

[0033] Table 1 Materials and parameters of quench tower equipment

[0034] name material diameter Thickness (mm) length / height(m) Cylinder 20R+304L Φ3600±18 16±3 20.7 Head 20R+304L Φ3600±18 16±3 0.9 Skirt Q235-B Φ3614 22 6

[0035] Major corrosion features found in 2014:

[0036] (1) Pitting corrosion pits, through corrosion pits, diffusion corrosion pits, mechanical scratches.

[0037] (2) Causes of corrosion: pitting corrosion and uniform corrosion, the cause of pitting corrosion is due to the high chloride ions in the container; the cause o...

Embodiment 2

[0066] The main function of the torch liquid separation tank is to separate the liquid droplets in the exhaust gas. It was put into operation in April 2010. The equipment specifications are: The total weight is 5.2 tons, the cylinder material is SA516GR.70N, and the working medium is H 2 S acidic liquid.

[0067] During the maintenance in 2014, it was found that there were large areas of corrosion pits with different depths at the bottom of the torch liquid separation tank, among which the deepest corrosion point was 6.0mm, and the total corrosion area was about 0.6m 2 .

[0068] Treat with the on-site repair and remanufacturing process of the present invention, the steps are as follows:

[0069] Step 1. Pre-treatment for cold welding

[0070] Use mechanical grinding methods (such as angle grinder, grinder, gauze grinder, small polishing machine, fine whetstone, fine file or fine sandpaper) to remove the rust layer, fatigue layer and oxide layer on the part to be repaired ...

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Abstract

The invention discloses a field repair and remanufacturing process of a pressure container. The process comprises the following steps: (1) one part, to be repaired, of the container is polished and cleaned; (2) the cold welding repair is performed for the part to be repaired; the specification of a welding material is phi1.6-2.0 mm, the current is 0-300 A, and the flow of shielding gas is 3-6 L / min; (3) the excess weld metal and the edge of the welded surface are finished until the surface is qualified through nondestructive inspection; and (4) the sand blasting treatment is performed for the surface to be repaired, so that the surface is roughened; a reinforcing layer is sprayed on the surface of the container by a supersonic spraying technology; the spraying pressure is 1.5-3.5 MPa; the surface temperature of the container is not higher than 150 DEG C; and the spraying distance is 60-120 mm. The process has the following advantages: such defects as mechanical damage, corrosion and wear on the surface of the container are repaired; and the reinforcing layer with a thickness of higher than 0.1 mm is formed on the surface of the container, so that the container is protected from resisting bad corrosion and wear environments for a long time, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of pressure vessel repair, in particular to an on-site repair and remanufacturing process of a pressure vessel. Background technique [0002] Pressure vessels are widely used, and they are indispensable important equipment in petrochemical industry, energy industry, scientific research and military industry and other industries. The pressure vessel generally consists of six parts: the cylinder, the head, the flange, the sealing element, the opening, the connecting pipe, and the support. It is mostly used in complex and harsh environments with high temperature, high pressure, and high corrosion. Various welding defects, structural defects, material defects, cracks, corrosion, wear, etc. during use, coupled with material damage caused by long-term extended service, are likely to cause brittle fracture, fatigue, corrosion, erosion, stress corrosion, and intergranular corrosion. And corrosion fatigue and other forms, onc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/04C23C24/08
CPCB23P6/04C23C24/087
Inventor 苗西魁
Owner 苗西魁
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