A One-Minute Guide to What a Large-Diameter High-Pressure Hose Is

　　Large‑diameter high‑pressure hoses are commonly used, with working pressures ranging from 70 to 120 MPa. They are widely employed in mining hydraulic supports, oilfield development, construction projects, and lifting and transportation applications, conveying certain liquids at specific temperatures and pressures. There are two main types: high‑pressure steel‑wire‑spiraled hoses and high‑pressure steel‑wire‑braided hoses. Regardless of the type, it is essential to select the appropriate hose by ensuring it meets the required performance specifications. Let’s take a look at their typical applications.

　　I. What is a high-pressure hose?

　　As its name suggests, it is a type of hose capable of withstanding high pressure, primarily used in the coal and petroleum industries. With working pressures ranging from 70 to 120 MPa, it is referred to as a high-pressure rubber hose.

　　II. Large-diameter high-pressure hose What are its uses?

　　As a commonly used type of hose, large‑diameter high‑pressure rubber hoses are widely employed in hydraulic supports for mining, oilfield development, construction projects, lifting and transportation, metallurgical forging, mining equipment, marine applications, injection molding machinery, agricultural machinery, various machine tools, and automated hydraulic systems across numerous industrial sectors. They are utilized in systems to convey fluids at specific temperatures and pressures, such as mineral oils, soluble oils, hydraulic oils, fuel oils, lubricating oils, emulsions, and oil–water emulsions.

　　III. How many types are there?

　　According to the manufacturing process, they are mainly classified into two types: high-pressure steel-wire-wound hoses and high-pressure steel-wire-braided hoses.

　　1. High-pressure steel-wire-reinforced rubber hose

　　Its structure consists primarily of an inner rubber layer, a middle rubber layer, a steel‑wire reinforcement layer wound in alternating layers of four or more plies, and an outer rubber layer. The inner rubber layer serves to withstand the pressure of the conveyed medium and to protect the steel wires from corrosion. The outer rubber layer safeguards the steel wires against damage, while the steel wire reinforcement layer (with wire diameters ranging from 0.3 to 2.0 mm) forms the reinforcing skeleton. The operating temperature range for high‑pressure steel‑wire‑reinforced hoses is –40°C to 120°C, and the product specifications span from DN6 mm to DN305 mm.

　　2. High-pressure steel wire braided rubber hose

　　The structure consists primarily of a liquid‑resistant synthetic rubber inner liner, an intermediate rubber layer, steel‑wire braided layers I, II, and III, and a weather‑resistant synthetic rubber outer liner. The operating temperature range for high‑pressure steel‑wire‑braided hoses is: oil—40°C to 100°C; air—30°C to 50°C; water–emulsions—below 80°C. Size range: DN5 mm to DN102 mm.

　　IV. Large-diameter high-pressure hose What are the requirements?

　　In addition to reliable product quality, selecting the appropriate high-pressure hose based on your specific application is equally important. General usage requirements are as follows:

　　1. Select the number of wire layers in the hose based on the system pressure; the higher the pressure, the greater the number of wire layers. Each hose has a maximum working pressure, and its burst pressure is four times that maximum working pressure. Therefore, when choosing a hose, ensure its maximum working pressure exceeds the actual operating pressure.

　　2. Select based on traffic volume

　　If the pipe diameter is too small, it will increase the flow rate of the medium inside the pipe, leading to system heating and reduced efficiency, as well as excessive pressure drop, which in turn can adversely affect the overall system performance. When securing hoses with hose clamps or routing them through steel plates or other gaskets, care should also be taken to consider the hose’s outer diameter.

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