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Alloy coating preventing spherical tank sulfide stress corrosion cracking, preparation method thereof and processed anticorrosion spherical tank

A technology of stress corrosion cracking and alloy coating, applied in metal material coating process, coating, container and other directions, to achieve the effect of good bonding, reducing the probability of stress corrosion, prolonging the safe service period and inspection period

Inactive Publication Date: 2013-04-10
北京赛诺迪管道安全技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of corrosion investigations have shown that the safe lower limit of hydrogen sulfide content to prevent stress corrosion cracking cannot be fully determined; foreign sources have reported that 17% of pressure vessels in water-phase process environments with hydrogen sulfide content less than 50 μg / g have also been found. cracking rate

Method used

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  • Alloy coating preventing spherical tank sulfide stress corrosion cracking, preparation method thereof and processed anticorrosion spherical tank
  • Alloy coating preventing spherical tank sulfide stress corrosion cracking, preparation method thereof and processed anticorrosion spherical tank
  • Alloy coating preventing spherical tank sulfide stress corrosion cracking, preparation method thereof and processed anticorrosion spherical tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The four in-service spherical tanks to be protected in this embodiment have a volume of 1000 cubic meters and an inner surface area of ​​484 square meters, three of which are petroleum liquefied gas fuel tanks, and one is a light hydrocarbon fuel tank. These four spherical tanks have been in service for more than 10 years, and the hydrogen sulfide content in the tanks is very high, with an average concentration exceeding 5000ppm. This situation has a very adverse impact on the safe operation of the spherical tanks. In order to eliminate hidden dangers of accidents, reduce hazards, and ensure safe and stable long-term operation of liquid hydrocarbon spherical tanks, countermeasures must be taken to avoid equipment accidents.

[0091] (1) Sand blast the inner wall of the spherical tank to reach Sa3 white level;

[0092] (2) Within 6 hours after the sandblasting treatment is completed on the inner wall of the spherical tank, the alloy coating of the present invention is sp...

Embodiment 2

[0094] Example 2: Preparations before construction

[0095] (1) Quartz sand. 25-mesh corundum sand, hard, angular, free of impurities, moisture content < 1%, if it exceeds 1%, it needs to be dried before use.

[0096] (2) The alloy coated wire of the present invention and the special sealing agent for the alloy coating of the present invention.

Embodiment 3

[0097] Embodiment 3: surface pretreatment

[0098] (1) The rust removal method is sand blasting. Pressure-feeding sand feeding, sandblasting distance 200mm, sandblasting pressure 0.6MPa, sandblasting time 10s.

[0099] (2) Quality standards and testing methods: The surface treatment level meets the Sa3 standard in GB8923 "Steel Surface Rust Removal Classification", that is, there is no visible grease, dirt, scale, rust and paint coating on the metal surface. Residual traces should only be light spots of color in the form of dots or streaks.

[0100] (3) The outlet of the air compressor must have an oil-water separator, and the outlet pressure is greater than 8kg / cm 2 ;After passing the sandblasting inspection, the first alloy layer needs to be sprayed within 6 hours.

[0101]

[0102]

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PUM

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Abstract

The invention discloses an alloy coating, a processing method thereof and an antiseptic spherical tank. The alloy coating comprises zinc, aluminium, iron, manganese, carbon and rare earth element. The rare earth element is one or more of rhenium, lanthanum, cerium, praseodymium and indium. The zinc accounts for 83-86 parts by weight, the aluminium accounts for 14-16 parts by weight, the iron and manganese account for 0.000001-0.1 part by weight, the carbon accounts for 0.000001-0.03 part by weight, and the rare earth element accounts for 0.01-2.4 parts by weight. The rare earth element can be0.02-0.06 part of lanthanum and 0.03-0.08 part of cerium. In the invention, the characteristics that Zn, Al and other non-ferrous metals have good combinability with carbon steel, and isolation effect and cathode protection effect can be realized on the carbon steel substrate of a spherical tank. The zinc aluminium compound covering layer is characterized in that the respective advantages of zincand aluminium are maintained and the original disadvantages are overcome, so that the covering layer has the advantages of more excellent protective performance and longer service life.

Description

technical field [0001] The invention relates to an anti-corrosion treatment material, a treatment method thereof, and anti-corrosion equipment, in particular to an alloy coating for preventing sulfide stress corrosion cracking of a spherical tank containing H2S, a treatment method thereof, and a treated anti-corrosion spherical tank. Background technique [0002] With the deep exploitation of crude oil and the increase of imported crude oil, the sulfur content in the raw oil of the refinery is getting higher and higher, and many refineries cannot dehydrate and desulfurize liquefied petroleum gas (LPG) according to the operating regulations for various reasons treatment, so that the sulfur content in the LPG it produces is also very high. At the same time, the sulfur content in the LPG produced in the oil field has also risen sharply, and the corrosion of the LPG spherical tank has become increasingly serious. The total sulfur content in LPG of a petrochemical company affil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/14B65D88/04B65D90/04C23C4/131
Inventor 赵杨丁宝峰杜翠女赵明
Owner 北京赛诺迪管道安全技术有限公司