PRIME STEEL PIPE: boiler pipe

Showing posts with label boiler pipe. Show all posts

2016/07/12

Boiler Tube Hardness

Boiler tube hardness is one very important factor to determine the quality of high pressure boiler tubes.

First, it must be considered to detect the mechanical properties of hardness high pressure boiler tubes, because it is the relationship between the performance and quality of deformation, punching, cutting and other processing problems. So first of its hardness testing should detect its mechanical properties. Detection methods generally tensile test and hardness test. Tensile test, that is, to the high-pressure boiler tube sample preparation, but also in a tensile testing machine will stretch until the specimen breaks, so you can measure the tensile strength of the high-pressure boiler tubes, yield strength, elongation after fracture and reduction. Tensile tests in the metallic material is often carried out detecting means, is not easy for many hardness test, tensile test must be carried out. There are several hardness test method: like scarification, pressed into law, power law, etc., the material hardness test is one of the easiest tests to compare and tensile test, etc. especially concerned.

Hardness performance requirements

① high hardness and wear resistance;

② high dimensional stability;

③ deformation after heat treatment;

④ In the course of storage or change the size and hardness does not occur.

2016/03/08

High Pressure Boiler Pipe Rust Remove

There are different methods to remove rust for the high pressure boiler pipe:

1. Cleaning
Using solvent, emulsion to clean the surface of high pressure boiler pipe so as to achieve the removal of oil, grease, dust, lubricants and similar organic matter. However, this cleaning process can not remove the high pressure boiler pipe surface rust, scale, welding flux, etc. Therefore, the cleaning process is only a adjust process for anti-corrosion processing.

2. Remove Rust by Tools
Use a wire brush and other tools for high pressure boiler pipe surface polished. It can be removed loose or tilt of the oxide scale, rust, welding slag. Hand tools rust can reach SA2 level, power tools rust can be achieved SA3 level. If the high pressure boiler pipe attached to a solid surface oxide skin, tools rust effect is not ideal. This method can not meet the anti-corrosion construction requirements.

3. Pickling
General use two methods to do chemical and electrolytic pickling. Chemical pickling applied on pipeline corrosion can descaling rust, old coatings, and sometimes used as a sand-blasting after re-processing. Although using chemical pickling can clean the surface and to reach a certain cleanliness roughness, but it is easy to pollute the environment.

4. Spray Radio Rust/Throwing Radio Rust
Spray radio rust is driven spray shot by high-power and high-speed rotating blade motor. Under the steel pipe surface spray radio processing, the grit, sheet shot, wire segments, minerals are under the centrifugal force. This process can not only completely remove rust, oxides and dirt, but also can achieve the required uniform roughness due to the influence of high pressure boiler pipe severe abrasive impact and friction force. After the spray radio rust, it can expand the physical adsorption of the steel pipe surface, but also can enhance the mechanical adhesion of the coating and the surface of the steel pipe. Therefore, spray radio rust is an ideal method for pipeline corrosion. Generally, blasting is mainly used for high pressure boiler pipe surface treatment and for the outer surface of the tube processing. Use spray radio rust should pay attention to several issues.

With the development of economy, long distance oil and gas pipeline is an very important liquid transportation method. While in the oil and gas pipeline area, the pipeline corrosion construction process is the key to ensure energy security in the oil and gas industry. For high pressure boiler pipe, the surface rust is one reasons affect the steel pipe application time. Rust removing method can ensure the quality of the steel pipe surface, based on the same equipment, rust removing can greatly improving the level of technology and reduce production costs.