CN201437869U - Steel pipes with corrosion-resistant and drag-reducing and wear-resistant coatings - Google Patents

Abstract

The steel pipe with corrosion-resistant and drag-reducing and wear-resistant coating of the utility model is applied to oil and natural gas transmission pipelines. It is a steel pipe with corrosion-resistant and drag-reducing and wear-resistant coating. Welding section, wear-resistant and drag-reducing coating for long gas pipelines, liquid solvent-free epoxy coating for long gas pipelines, inorganic zinc silicate weldable inner coating, inorganic zinc silicate weldable outer coating (6 ) composition, the effect is: a steel pipe with excellent drag reduction and wear resistance, adhesion, salt spray resistance, chemical reagent resistance, impact strength and a coating that matches the applied current cathodic protection, which can be used for long gas and oil pipelines construction.

Description

Steel pipes with corrosion-resistant and drag-reducing and wear-resistant coatings

technical field

The utility model relates to oil and natural gas transmission pipelines, in particular to buried long-distance oil and natural gas pipelines. It is a steel pipe with a corrosion-resistant and drag-reducing and wear-resistant coating. A pipeline with good synergies and increased delivery rates.

Background technique

Existing steel and elbows generally do not have internal anti-corrosion coatings, or only use ordinary coatings for anti-corrosion, and external anti-corrosion uses anti-corrosion coatings such as epoxy coal tar pitch, or heat-shrinkable tapes and cold-wound tapes for anti-corrosion. For buried long-distance pipelines, there are many bends and the inner surface does not use anti-corrosion coatings or ordinary coatings, which cannot achieve good anti-corrosion and reduce transmission resistance effects; while external anti-corrosion uses epoxy coal tar pitch and other anti-corrosion The coating has the disadvantage that it is difficult to match the cathodic protection. In the case of current protection, the coating is easy to fall off and be damaged. The anti-corrosion of heat-shrinkable tape and cold-wound tape needs to be painted with corresponding primer. The technical requirements of personnel are high, and it is easy to form hollowing and other disadvantages.

Utility model content

The purpose of this utility model is: to provide a steel pipe with a corrosion-resistant and drag-reducing wear-resistant coating, which is protected by a coating on the inner and outer walls of the pipe and a weldable coating at both ends, so that the pipeline has excellent drag-reducing wear-resisting and adhesion , salt spray resistance, chemical resistance, impact strength and match with impressed current cathodic protection. It overcomes the deficiency that the coating is very easy to fall off and damaged in the prior art.

The technical scheme adopted by the utility model is: a steel pipe with a corrosion-resistant and drag-reducing and wear-resistant coating, including a steel pipe, which is characterized in that: there are reserved welding sections at both ends of the steel pipe, and a long-distance The wear-resistant and drag-reducing inner coating for gas pipelines, the outer surface of the steel pipe is coated with a liquid solvent-free epoxy outer coating for long gas pipelines, and the inner surface of the reserved welding section at both ends of the steel pipe is coated with inorganic zinc silicate Welding inner coating, and the outer surface of the reserved welding section at both ends of the steel pipe has an inorganic zinc silicate weldable outer coating.

The outer diameter of the steel pipe is between 325mm and 1600mm, the wall thickness is 16mm to 32mm, the reserved welding sections at both ends are respectively 80mm to 200mm long, and the thickness of the wear-resistant and drag-reducing inner coating for long gas pipelines is 0.06-32mm. 0.1mm, the thickness of liquid solvent-free epoxy outer coating for long gas pipelines is 0.5~2mm, the thickness of inorganic zinc silicate weldable inner coating is 0.04~0.06mm, the thickness of inorganic zinc silicate weldable outer coating The thickness is 0.04-0.06mm.

The steel pipes include straight steel pipes and bent steel pipes, that is, bent pipes.

The manufacturing process of steel pipes with corrosion-resistant and drag-reducing and wear-resistant coatings is as follows:

Sand blast the inner and outer surfaces of the steel pipe to remove rust, spray the inner surface of the steel pipe with a wear-resistant and drag-reducing inner coating for long gas pipelines, and spray the outer surface of the steel pipe with a liquid solvent-free epoxy outer coating for long gas pipelines. The inner surface of the reserved welding section is sprayed with an inorganic zinc silicate weldable inner coating, and the outer surface of the reserved welding section is sprayed with an inorganic zinc silicate weldable outer coating. The steel pipe is joined with welds on site to make the pipeline.

The beneficial effects of the utility model:

1. The inner protective coating is wear-resistant and drag-reducing coating for long gas pipelines, which not only protects the steel pipe from corrosion, but also improves the gas transmission rate of the pipeline and reduces the operating cost of the pipeline.

2. The external anti-corrosion coating adopts liquid solvent-free epoxy coating for long gas pipelines, which simplifies the anti-corrosion construction and improves the corrosion resistance of steel pipes. It can also cooperate with the cathodic protection provided by the external current to ensure the long-term, long-term protection of the pipeline. safe operation.

3. The inner and outer surfaces of the reserved welding section are coated with an inorganic zinc silicate weldable coating, which can prevent further corrosion of the reserved welding section before the pipeline is welded and repaired. The welding slag generated during pipeline welding can be easily cleaned, thereby improving The quality of pipeline joints keeps the pipeline in good anti-corrosion effect.

Description of drawings

Fig. 1 is a schematic longitudinal section of a steel pipe with a corrosion-resistant and drag-reducing and wear-resistant coating.

In the figure, 1. Steel pipe, 2. Reserved welding section, 3. Wear-resistant and drag-reducing inner coating for long gas pipeline, 4. Liquid solvent-free epoxy outer coating for long gas pipeline, 5. Inorganic silicic acid Zinc weldable inner coating, 6. Inorganic zinc silicate weldable outer coating.

Detailed ways

Embodiment 1: Taking a steel pipe with an outer diameter of 1219 mm as an example with a corrosion-resistant and drag-reducing wear-resistant coating, the utility model is further described in detail.

See Figure 1. The steel pipe 1 of the utility model is a straight steel pipe. The outer diameter of the steel pipe 1 is 1219mm, the wall thickness is 22mm, and the length of the reserved welding section 2 is 150mm. The thickness of coating 4 is 1.2mm, the thickness of inorganic zinc silicate weldable inner coating 5 is 0.05mm, and the thickness of inorganic zinc silicate weldable outer coating 6 is 0.05mm.

The liquid solvent-free epoxy outer coating 4 for the long-distance gas pipeline is sprayed with the liquid solvent-free epoxy coating sold by Tianjin Zhongyou Boxing Engineering Technology Co., Ltd., and other materials are sold in the market.

Embodiment 2: It is basically the same as the utility model, and the difference is that: the steel pipe 1 adopts a bent steel pipe.

Claims (5)

1. one kind has steel pipe corrosion-resistant and the drag reduction wear resistant coating, comprise steel pipe (1), it is characterized in that: reservation welding section (2) is arranged at the two ends of steel pipe (1), scribble long gas pipeline with wear-resisting drag reduction undercoating (3) at the internal surface of steel pipe (1), outer surface at steel pipe (1) scribbles long gas pipeline liquid non-solvent epoxy external coating (4), scribble inorganic zinc silicate at the internal surface of the reservation welding section (2) at steel pipe (1) two ends and can weld undercoating (5), have inorganic zinc silicate can weld external coating (6) at the outer surface of the reservation welding section (2) at steel pipe (1) two ends.

2. according to claim 1ly have a steel pipe corrosion-resistant and the drag reduction wear resistant coating, it is characterized in that: the external diameter of described steel pipe (1) between 325～1600mm, wall thickness is 16～32mm, the long respectively 80～200mm of welding section (2) is reserved at two ends, long gas pipeline is 0.06～0.1mm with the thickness of wear-resisting drag reduction undercoating (3), long gas pipeline is 0.5～2mm with the thickness of liquid non-solvent epoxy external coating (4), the thickness that inorganic zinc silicate can weld undercoating (5) is 0.04～0.06mm, and the thickness that inorganic zinc silicate can weld external coating (6) is 0.04～0.06mm.

3. according to claim 1ly have a steel pipe corrosion-resistant and the drag reduction wear resistant coating, it is characterized in that: described steel pipe (1) is a straight steel pipe.

4. according to claim 1ly have a steel pipe corrosion-resistant and the drag reduction wear resistant coating, it is characterized in that: described steel pipe (1) is curved steel pipe.

5. describedly have a steel pipe corrosion-resistant and the drag reduction wear resistant coating according to claim 1,2,3 or 4, it is characterized in that: the external diameter of steel pipe (1) pipe is 1219mm, wall thickness 22mm, reserve the long 150mm of welding section (2), long gas pipeline is 0.07mm with wear-resisting drag reduction coating (3) thickness, long gas pipeline is 1.2mm with the thickness of liquid non-solvent epoxy coating (4), the thickness that inorganic zinc silicate can weld undercoating (5) is 0.05mm, and the thickness that inorganic zinc silicate can weld external coating (6) is 0.05mm.

Images