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Pipeline hot galvanizing flange sealing surface isolating method

A flange sealing and hot-dip galvanizing technology, which is applied in the hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems such as the flange sealing groove is not protected, the sealing effect is affected, and the quality risk is increased. , to achieve the effect of ensuring the sealing effect of the flange, preventing corrosion and reducing construction costs

Inactive Publication Date: 2019-04-26
CNOOC ENERGY TECH & SERVICES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flange connection in the prior art has the following disadvantages: if it is galvanized first and then welded, the high temperature generated by welding will destroy the galvanized layer of the weld; if it is welded and then galvanized, the flange sealing groove will not be obtained. Protection, the zinc liquid adheres to the sealing concave-convex groove, which affects the sealing effect and increases the quality risk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment adopts the following steps to realize the sealing of the flange sealing surface:

[0021] 1. First, the flange and the pipeline are assembled as a whole by welding. In this embodiment, welding is used to connect;

[0022] 2. Apply the polyurethane coating for the first time on the flange cover of the pipeline as a whole, the thickness of the paint film is 0.06mm, and then let it stand and dry for 12 hours; then repeat the above operation until the fourth drying is completed, so that the above The thickness of polyurethane coating reaches 0.24mm, and the total drying time reaches 48 hours;

[0023] 3. Soak the entire pipeline with the dried flange cover in 20% concentrated hydrochloric acid solution for 30 minutes;

[0024] 4. Soak the above pickled pipeline as a whole in 15% NH 4 In the Cl immersion aiding solvent, the immersion time is 3-5 minutes;

[0025] 5. Immerse the above-mentioned pipeline as a whole in a liquid zinc pool with a temperature no...

Embodiment 2

[0027] The steps for realizing the sealing of the flange sealing surface in this embodiment are the same as those in Embodiment 1, the difference is that the pickling time in the above step 3 is 35 minutes, and the NH in the above step 4 4 The concentration of the Cl immersion and fluxing solvent is 25%, and the immersion time in the above step 5 is 23 minutes.

Embodiment 3

[0029] The steps for realizing the sealing of the flange sealing surface in this embodiment are the same as those in Embodiment 1, the difference is that the pickling time in the above step 3 is 33 minutes, and the NH in the above step 4 4 The concentration of the Cl immersion and fluxing solvent is 20%, and the immersion time in the above step 5 is 21 minutes.

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Abstract

The invention discloses a pipeline hot galvanizing flange sealing surface isolating method. The method comprises the following steps: (1) flanges and pipelines are assembled; (2) polyurethane paint isrepeatedly coated on flange sealing surfaces of the pipelines for standing and drying; (3) the pipes with the dried flange sealing surfaces are dipped in 20% of concentrated hydrochloric acid solution for acid washing; (4) the pipelines are dipped in NH4Cl plating assistant solvent after acid washing; and (5) the pipelines are dipped in a liquid-state zinc pool with a temperature of not lower than 450 DEG C. The method can prevent high-temperature damage of welding line zinc coating layers and damage of the flange sealing surfaces.

Description

technical field [0001] The invention relates to the field of metal anticorrosion, and more specifically relates to a method for isolating the sealing surface of a pipeline hot-dip galvanized flange. Background technique [0002] The offshore oil industry needs a large number of pipelines for transporting corrosive fluids. The price of pipeline materials such as copper nickel and stainless steel is high. In contrast, hot-dip galvanizing is a low-cost and efficient metal anti-corrosion method. The specific method is Immerse the rust-removed steel parts in the molten zinc at about 450 °C, so that the surface of the metal structural parts will be attached with a zinc layer, so as to achieve the purpose of anti-corrosion. At present, most of the galvanized pipelines used in anti-corrosion in petrochemical pipelines are connected by screws. However, fluids such as sea water, fire water, and chemical agents need to use flange connections with higher sealing performance. However, t...

Claims

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Application Information

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IPC IPC(8): C23C2/02C23C2/06C23C2/34
CPCC23C2/02C23C2/06C23C2/34
Inventor 赵杰门维王金鹤潘闻裴星越张千东张国军唐雨许庆陆
Owner CNOOC ENERGY TECH & SERVICES
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