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On-site Repair and Remanufacturing Technology of Pressure Vessels

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

Inactive Publication Date: 2018-02-09
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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  • On-site Repair and Remanufacturing Technology of Pressure Vessels
  • On-site Repair and Remanufacturing Technology of Pressure Vessels
  • On-site Repair and Remanufacturing Technology of Pressure Vessels

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 exhaust gas of hydrogenation reduction. It was put into production in April 2010. The equipment is about 28m high. The cylinder is made of composite plates rolled and welded. The spherical heads at both ends are made by cold stamping. The parameters are shown in Table 1:

[0033] Table 1 Quench tower equipment materials and parameters

[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 seat

Q235-B

Φ3614

22

6

[0035] The main corrosion features found in 2014:

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

[0037] (2) Corrosion causes: pitting corrosion and uniform corrosion. The cause of pitting corrosion is the high chloride ion produced in the container; the cause of uniform corrosion is the presence of carb...

Embodiment 2

[0066] The main function of the torch separator is used to separate the liquid droplets in the exhaust gas. It was put into production in April 2010. The equipment specifications are: 1800×3600×14mm, total weight is 5.2 tons, cylinder material is SA516GR.70N, working medium is H 2 S acidic liquid.

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

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

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

[0070] Use mechanical polishing methods (such as angle grinders, grinders, gauze grinders, small polishers, fine oilstone, fine files or fine sandpaper) to remove the rust, fatigue and oxide layers of the parts to be repaired until the fresh substrate is rea...

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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 a pressure vessel on-site repair and remanufacturing process. Background technique [0002] The pressure vessel has a wide range of uses. It is an indispensable important equipment in the petrochemical industry, energy industry, scientific research and military industry. Pressure vessels generally consist of six parts: cylinder, head, flange, sealing elements, openings and pipes, and supports. They are mostly used in complex and harsh environments with high temperature, high pressure, and high corrosion. Welding defects, structural defects, material defects, cracks, corrosion, abrasion, etc. during use, plus material damage caused by long-term over-service service, are likely to cause brittle fracture, fatigue, corrosion, erosion, stress corrosion, and intergranular corrosion As well as corrosion fatigue and other forms, once an accident occurs, it will bring extremely serious c...

Claims

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Application Information

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