Detailed explanation of galvanized steel pipe wall thickness and pressure bearing capacity: How to select scientifically?

Galvanized steel pipes are an indispensable basic material in modern industry and construction. They are widely used in various engineering projects with their excellent corrosion resistance and mechanical strength. In the selection process, the wall thickness and pressure bearing capacity of galvanized steel pipes are key considerations. This article will explore the relationship between the two in depth and provide a practical guide for scientific selection.

I. The correlation between the wall thickness and pressure bearing capacity of galvanized steel pipes

The wall thickness of galvanized steel pipes directly determines their pressure bearing capacity. Generally speaking, the thicker the wall, the stronger the strength and pressure resistance of the steel pipe. This is because the increase in wall thickness increases the tensile strength and bending section modulus of the steel pipe, enabling it to withstand greater internal pressure and external force. For example, at the same outer diameter, a galvanized steel pipe with a wall thickness of 4.5mm has a higher pressure bearing capacity than a steel pipe with a wall thickness of 3.0mm.

The pressure bearing capacity of galvanized steel pipes is also affected by the material, production process and use environment. For example, galvanized steel pipes made of high-strength alloy steel have higher pressure bearing capacity than ordinary low-carbon steel pipes. At the same time, hot-dip galvanizing can form a more uniform and denser galvanized layer than other galvanizing methods, thereby improving the corrosion resistance and service life of the steel pipe.

II. Key elements of scientific selection

1. Clarify the project requirements

Before selecting, it is necessary to clarify the specific requirements of the project for galvanized steel pipes, including working pressure, conveying medium, environmental conditions, etc. For example, for high-pressure gas transmission systems, galvanized steel pipes with thicker walls and stronger pressure bearing capacity should be selected; while in general indoor environments, steel pipes with relatively thinner walls can be selected to reduce costs.

2. Consider the use environment

The use environment has an important influence on the selection of galvanized steel pipes. In highly corrosive environments such as marine and chemical industries, steel pipes with thicker walls and thicker galvanized layers should be selected, and additional anti-corrosion measures such as coating protection or cathodic protection should be considered. In high or low temperature environments, the thermal expansion coefficient and low-temperature toughness of the steel pipe should also be considered to ensure its long-term stable operation.

3. Evaluate materials and processes

The materials and processes of galvanized steel pipes directly affect their performance and cost. Common materials include Q195, Q215, Q235, Q345, etc., which have different strengths and corrosion resistance. When choosing, you should weigh them according to the engineering requirements and the use environment. At the same time, you should pay attention to the production process of steel pipes, such as hot-dip galvanizing, electrogalvanizing, etc., to ensure that the quality of steel pipes meets relevant standards.

4. Pay attention to brand and quality

Choosing galvanized steel pipes from well-known brands can better guarantee the quality and stability of the products. Brands usually have a high reputation and after-sales service guarantee, and can provide more help and support during the purchase process. When purchasing, you can judge its quality by observing the glossiness of the steel pipe surface, the uniformity of the galvanized layer, and whether there are surface defects such as scratches and bubbles.

III. Precautions in selection practice

1. Avoid over-design

Although increasing the wall thickness can improve the pressure-bearing capacity of galvanized steel pipes, over-design will lead to increased costs and waste of resources. When selecting, accurate calculations should be made based on engineering requirements and the use environment to select the most appropriate wall thickness specification.

2. Consider installation and maintenance

The installation and maintenance of galvanized steel pipes are also factors that need to be considered during the selection process. For example, thick-walled steel pipes may require heavier connectors and more complex installation processes; and steel pipes in special environments may require regular inspections and maintenance to ensure their stable performance.

3. Follow relevant standards

During the selection process, national and industry standards such as GB/T 3091-2015 should be strictly followed. These standards clearly define the size, material, performance, etc. of galvanized steel pipes, and are an important basis for ensuring the quality and safety of steel pipes.