How to Understand Hose Performance from Basic Parameters

Hello everyone! Welcome to VELON Academy. Through the previous chapters, we have gained a preliminary understanding of hoses. However, when it comes to practical application, we might still face difficulties. Even with product manuals, we might not know how to match the STAMPED information. In this chapter, we will delve deeper into understanding hoses. We will focus on common technical parameters, technical performance, and common misunderstandings.

First, let's look at the main parameters of hoses. Common technical parameters of hoses include inner and outer diameters, working temperature, working pressure, bending radius, weight, etc. These parameters are quantitative data, and mastering this data is of significant guiding importance for the selection and correct use of hoses.

1. Working Temperature: The working temperature is a temperature range representing the reliable use of the hose within this range. A common misunderstanding is that some customers believe that as long as it is within the temperature range, the hose will exhibit the same flexibility at the lowest temperature as it does at room temperature, or that the working pressure can be achieved simultaneously at high temperatures. The correct understanding is that within this temperature range, the hose will not crack or fail, but some functions may be limited at specific temperatures.

2. Working Pressure: This refers to the maximum pressure that the hose can safely withstand under specified working conditions. Working pressure often appears together with burst pressure. Working pressure is calculated using the formula:

Working Pressure=Safety Factor /Burst Pressure

Burst pressure is designed and is related to the hose's structure, material, hardness, etc. The safety factor is a constant value, chosen based on different industries or applications. For example, the safety factor for ordinary water hoses is 3, for air hoses it is 4, and for steam hoses, it is 10.

3. Bending Radius: The bending radius refers to the minimum radius at which the hose can be safely used. We know that after bending, the circular cross-section of the hose becomes elliptical. When the major axis of the ellipse exceeds 10% of the hose's standard diameter, the measured bending radius ( R ) value is the nominal minimum bending radius. However, we strongly advise against using the hose at the minimum bending radius for extended periods, as it is prone to premature damage.

4. Weight: Weight refers to the weight per meter of the hose. The weight of the hose affects its operability during installation and maintenance. A hose that is too heavy may lead to installation difficulties, inconvenient operation, and even affect the reliability of the connection. Therefore, it is wise to choose a lighter hose when frequent movement and disassembly are required. Sometimes, customers believe that heavier industrial hoses appear more solid, which is a misunderstanding. Excellent formulations and fewer additives can achieve a lighter design, whereas heavy hoses often contain a large amount of high-density fillers, which do not provide any substantial benefits other than making the hose appear thicker. We will explain this knowledge point in detail in the basic knowledge of materials. Additionally, parameters such as the inner and outer diameter and length of the hose are self-explanatory and will not be elaborated here.

Next, we will further explain the technical characteristics of hoses from qualitative descriptions. Common descriptive terms in manuals include chemical compatibility, flexibility, wear resistance, weather resistance, and static conductivity. How should these terms be understood?

1. Chemical Compatibility: We know that hoses may transport different chemical media, and ensuring that they are not corroded by the media is a prerequisite. Different materials of hoses have different resistance to various media. Therefore, when selecting a hose, it is essential to check the "Chemical Compatibility Chart" to choose the appropriate hose. Good chemical compatibility can be understood as the ability to transport many chemicals.

Chemical Hose- GTC300

2. Flexibility: The flexibility of a hose refers to its ability to bend and deform when subjected to external forces. Good flexibility means that the hose can be bent with minimal force. This characteristic is a crucial consideration for many applications. The flexibility of a hose depends on a comprehensive design of materials, structure, and other factors. Speaking of flexibility, there is a common misunderstanding between flexibility and bending radius. Many people consider these two concepts to be the same, but there is no necessary relationship between them.

3. Wear Resistance: Wear resistance refers to the hose's ability to resist wear in abrasive applications. During use, hoses may transport abrasive media such as powders and slurries. In outdoor applications, they may come into contact with hard substances like sand and cement. Choosing a highly wear-resistant hose will extend its service life.

4. Weather Resistance: The usage environment of hoses includes various factors such as hot air, ozone, ultraviolet rays, and high salt spray, all of which can seriously affect the hose's lifespan. Among these, ozone has the most destructive effect on hoses.

5. Static Conductivity: The static conductivity of a hose refers to its ability to effectively conduct or release static electricity, preventing adverse effects caused by static accumulation. We often confuse static conductivity with electrical conductivity. In short, electrical conductivity pertains to conductors, while static conductivity pertains to insulators. Their measurement methods, tools, and resistivity representations are different.

If you have any questions please contact us:

export@velonhose.com