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Epoxy powder internal coating process for 316 stainless steel tubes

A stainless steel tube, epoxy powder technology, applied in coating, device for coating liquid on surface, surface pretreatment, etc., can solve problems such as burning coating, and achieve the effect of improving production efficiency and spraying quality

Inactive Publication Date: 2018-11-02
SHANGHAI TUBE COTE PETROLEUM PIPE COATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the inner coating pipe of the gathering pipeline is connected by welding, the instantaneous high temperature generated by welding will burn the coating in a certain area at both ends of the weld

Method used

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  • Epoxy powder internal coating process for 316 stainless steel tubes

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Effect test

specific Embodiment approach

[0032] A 316 stainless steel pipe epoxy powder internal coating process, according to the following steps:

[0033] (1) Thermal cleaning: Heat the 316 stainless steel pipe into a thermal cleaning furnace to 390-410°C and keep it for 3-5 hours to remove the organic matter and oil stains attached to the inner wall of the 316 stainless steel pipe, so that the organic matter and oil stain are completely carbonized;

[0034] (2) Sandblasting: The 316 stainless steel pipe after high temperature cleaning is automatically sandblasted on the inner surface to make the inner wall anchorage of the 316 stainless steel pipe reach 25-76um, and the rust removal grade reaches Sa2.5;

[0035] (3) Primer spraying: spray a layer of TC4028 primer uniformly on the inner surface of the sandblasted 316 stainless steel pipe, the film thickness of the primer is controlled at 25-40um; then enter the primer continuous furnace for baking, and the baking temperature is controlled at 170 ~190℃, the baking time is ...

Embodiment 1

[0046] The specification of 316 stainless steel pipe is Φ168*7mm. The primer adopts new spraying equipment, which automatically completes the whole process from suction to spraying. The primer baking temperature is 190℃, and the primer baking time is 85 minutes; the top paint adopts new vacuum adsorption The powder spraying equipment automatically completes the entire process from suction to spraying. The temperature of the tube body is about 180°C during spraying; the curing temperature of the coating is 225°C, and the curing time is 90 minutes; the thickness of the coating is 200-400um.

[0047] Implementation effect: Through performance testing and experiments, it is verified that the coating quality fully meets the indicators in the petroleum industry standard SY / T0544-2016; it is currently being promoted and used on multiple transmission pipelines in many domestic oil fields, and the use effect is good.

Embodiment 2

[0049] The specification of 316 stainless steel pipe is Φ114*7mm. The primer adopts new spraying equipment, which automatically completes the whole process from suction to spraying. The primer baking temperature is 185℃, and the primer baking time is 80 minutes; the top paint adopts new vacuum adsorption The powder spraying equipment automatically completes the entire process from material suction to spraying. The temperature of the tube is about 180°C during spraying; the curing temperature of the coating is 225°C, and the curing time is 85 minutes; the thickness of the coating is 200-400um.

[0050] Implementation effect: Through performance testing and experiments, it is verified that the coating quality fully meets the indicators in the petroleum industry standard SY / T0544-2016; it is currently being promoted and used on multiple transmission pipelines in many domestic oil fields, and the use effect is good.

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Abstract

The invention relates to an epoxy powder internal coating process for 316 stainless steel tubes. The process comprises the following steps: (1) performing high-temperature cleaning, namely introducing316 stainless steel tubes to enter a heat cleaning furnace, heating to 390-410 DEG C, maintaining the temperature for 3-5 hours, and removing organic matters and oil stains attached to the inner walls of the 316 stainless steel tubes; (2) performing sand blasting, namely performing full-automatic inner surface sand blasting treatment on the 316 stainless steel tubes subjected to high-temperaturecleaning; (3) performing primer spraying, namely uniformly spraying a layer of primer on the inner surfaces of the 316 stainless steel tubes subjected to sand blasting treatment, and entering a primeroven for baking; (4) performing epoxy powder finish paint spraying, namely discharging the 316 stainless steel tubes from the primer oven, and immediately spraying epoxy powder finish paint by adopting a vacuum powder adsorption technology; and (5) coating curing, namely directly feeding the 316 stainless steel tubes subjected to epoxy powder finish paint spraying into a curing furnace by a conveyor chain so as to perform final coating curing. Compared with the prior art, the epoxy powder internal coating process disclosed by the invention has the advantages that various process parameters are strictly controlled, and the quality of the epoxy powder internal coating of the 316 stainless steel tubes is ensured.

Description

Technical field [0001] The invention relates to a stainless steel coating process, in particular to a 316 stainless steel pipe epoxy powder inner coating process. Background technique [0002] With the development of domestic gathering pipelines and increasingly stringent environmental protection requirements, the application of internal coatings as a good anti-corrosion technology in gathering pipelines has become more and more widespread. However, when the inner coating pipes of the gathering and transportation pipelines are connected by welding, the instantaneous high temperature generated by the welding will burn out the coating in a certain area at both ends of the weld. In this way, the heat-affected zone of the weld and the damaged area of ​​the coating on both sides will not receive any anti-corrosion protection. This area will be the first to corrode when facing corrosive media, becoming the weak point and high corrosion area of ​​the entire pipeline. Summary of the inv...

Claims

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Application Information

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IPC IPC(8): B05D7/00B05D7/22B05D3/12B05D3/02F16L58/10
CPCB05D3/0236B05D3/0272B05D3/12B05D7/225B05D7/584B05D2504/00F16L58/1027B05D2425/01
Inventor 王涛张佳吴学珍徐晓旻宋卫国安琪章丽娜
Owner SHANGHAI TUBE COTE PETROLEUM PIPE COATING
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