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Method of protecting equipment against corrosion at high temperature

A kind of equipment and high temperature technology, which is applied in the field of protecting equipment from corrosion at high temperature, and can solve problems such as failure

Active Publication Date: 2009-04-08
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, even localized corrosion of this kind can cause components of equipment to fail when operating at pressures up to 50 bar

Method used

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  • Method of protecting equipment against corrosion at high temperature
  • Method of protecting equipment against corrosion at high temperature
  • Method of protecting equipment against corrosion at high temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] figure 1 Two conventional connection types with support bars are shown. In both cases, the system parts and the support bars to be connected are already protected by aluminizing at least in the regions that are to be corroded.

[0030] According to connection type 1, a support bar is located on the inner surface of the device and protrudes from this surface, this support bar is welded to the end A of the device at point A1, the chamfered end B of the device is designed to be chamfered with itself The ends A of the device are in contact; then, the two ends are welded on their outer surfaces. This conventional solution has two drawbacks in particular:

[0031] - the welding zone A1 is difficult or even impossible to form in pipes with a diameter of less than 100 mm using current means;

[0032] - In the welding area A1, especially in areas associated with different materials and structures, the protective layer is defective, presenting the risk of causing metal dusting...

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Abstract

The invention relates to a method of protecting equipment intended to operate at high temperature in the presence of a fluid containing at least one hydrocarbon and / or carbon monoxide against corrosion by metal dusting and / or carburization, method in which pieces of the equipment are made from an alloy containing nickel, iron, chromium and / or aluminum, and / or copper and in which said pieces of the equipment are protected from said corrosion by a protective coating. This method is characterized in that said equipment pieces protected in this way are connected to each other by means of joining pieces, said joining pieces being protected beforehand over at least part of their surface intended to be brought into contact with said fluid at high temperature, and in that each of the connections intended to be subjected to said corrosion is produced by external welding of the ends of the joining piece with said pieces of equipment.

Description

technical field [0001] The present invention relates to a method of protecting equipment operating at high temperatures in a fluid environment containing at least one hydrocarbon and / or carbon monoxide from corrosion due to metal dusting and / or carburization, wherein, Parts of the device are made of an alloy containing nickel, iron, chromium and / or aluminum and / or copper and are protected from said corrosion by a protective coating. Background technique [0002] In the remainder of the description, the term "high temperature" means a temperature at least equal to that at which metal dusting and / or carburization phenomena occur. It is generally believed that these phenomena occur at a temperature of about 450° C. or higher, depending on the pressure. [0003] Corrosion of the metal dusting and / or carburizing type is a major problem in industrial processes where the alloys used to manufacture equipment components and pipes are operated at high temperatures in an environment o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/02B01J19/00F16L13/02F16L58/08
CPCB01J19/0053B01J19/02B01J2219/0281F16L13/0272F16L13/02F16L58/08B01J2219/0236
Inventor S·维斯蒂奥克斯M·波托
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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