Types and categories of high-pressure hose fittings

All kinds of high pressure hose assembly joints: mainly divided into the following A, B, C, D, E, F, H type, flange type and other national standards, including 30 degrees bending 45 degrees 75 degrees bending and 90 degrees bending. There are also British, American and other national standard connectors.

(1) Coal industry

Coal industry oil pipes are mainly hydraulic support hose. In recent years, the pressure requirements of some coal mine hydraulic supports have been increased, and some steel wire braided hose can not meet its performance requirements, requiring the use of steel wire wound tubing. In addition, in order to prevent coal dust pollution in the process of underground coal mining and improve production safety, the variety of coal mine oil pipe has been increased, such as coal seam water exploration hole seal telescopic oil pipe, which is used for coal seam water injection and grouting before fully mechanized mining. It is reported that domestic manufacturers have produced, and tested by more than a dozen coal mines, can replace similar imported products.

(2) The petroleum industry

In the 21st century, China's offshore oil development strategy puts forward the key development of offshore and shallow sea oil fields, so the oil industry requires the use of shallow sea oil pipelines in addition to drilling pipelines and vibrating pipelines. Shallow sea submarine oil pipelines have been produced in China, but floating or semi-floating oil pipelines and deep-sea submarine oil pipelines still rely on imports. With the implementation of China's offshore oil development strategy, the requirements of offshore oil exploitation on the performance of pipelines will continue to increase.

High-pressure hose classification

High pressure tubing is mainly divided into high pressure wire braided tubing and high pressure wire wound tubing according to the production process:

High pressure wire winding tubing

The structure of high pressure steel wire winding tubing is mainly composed of inner rubber layer, middle rubber layer, 2, 4, 6 layers of steel wire winding layer and outer rubber layer. The inner rubber layer has the effect of making the conveying medium withstand pressure and protecting the steel wire from erosion, the outer rubber layer protects the steel wire from damage, and the steel wire (Phi 0.3-2.0 reinforcement layer) layer is the skeleton material to enhance the effect. The structure of high pressure steel wire winding tubing is mainly composed of an inner rubber layer, a middle rubber layer, 2, 4, 6 layers of steel wire winding layer and an outer rubber layer. The inner rubber layer has the effect of making the conveying medium withstand pressure and protecting the steel wire from erosion, the outer rubber layer protects the steel wire from damage, and the steel wire (Phi 0.3-2.0 reinforcement layer) layer is the skeleton material to enhance the effect.

Second, use: High pressure steel wire reinforced hydraulic tubing is mainly used in mine hydraulic support, oil field development, Suitable for engineering construction, lifting and transportation, metallurgy and forging, mining equipment, ships, injection molding machinery, agricultural machinery, various machine tools and various industrial departments mechanized, automated hydraulic system transport with a certain pressure (high pressure) and temperature of petroleum (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) and water-based liquids (such as emulsion, oil-water emulsion, water Etc and liquid transmission, the maximum working pressure can reach 70-120Mpa. Note: The company's winding tubing standards refer to GB/T10544-03 standards, DIN2003,SAE100R9, R

Third, working temperature: -40℃ ~ 120℃ Fourth, product specification range: DN6mm ~ DN305mm.

Type: 4SP - medium pressure tubing with four layers of wire wound 4SH - High pressure tubing with four layers of wire wound R12 - High temperature medium pressure tubing with four layers of wire wound under harsh conditions. Type R13 - Multi-layer wire winding for high temperature and high pressure tubing under harsh conditions. Type R15 - Multi-layer wire winding high temperature ultra-high pressure tubing under harsh conditions.

Structure: The high pressure steel wire winding tubing is composed of an inner rubber layer, a middle rubber layer, four or multiple layers of alternately winding steel wire reinforcement layer and an outer rubber layer.

High pressure wire braided tubing

First, structure: mainly composed of liquid resistant synthetic rubber inner layer, medium rubber layer, Ⅰ, Ⅱ, Ⅲ layer of wire braided layer, weather-resistant synthetic rubber outer layer, the inner rubber layer has the effect of making the conveying medium withstand pressure, protect the steel wire from erosion, the outer rubber layer protects the steel wire from damage, the steel wire layer is the skeleton material, plays an enhanced role.

Second, use: High pressure steel wire reinforced hydraulic tubing is mainly used in mine hydraulic support, oil field development, Suitable for engineering construction, lifting and transportation, metallurgy and forging, mining equipment, ships, injection molding machinery, agricultural machinery, all kinds of machine tools and various industrial departments mechanized, automated hydraulic system transport with a certain pressure and temperature of petroleum-based (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) and water-based liquids (such as emulsion, oil-water emulsion, water) and liquid transmission Move. Note: Braided tubing standards refer to GB/T3683-1992 and ISO/DIS1436-1985, DIN20022 and SAE100RIAT standards.

Third, the working temperature: oil -40℃ ~ 100℃, air -30℃ ~ 50℃, water emulsion +80℃ below, please use the factory special products.

4. Specification range: DN5mm ~ DN102mm.

High-pressure oil pipe production process:

The inner layer glue, middle layer glue and outer layer glue are mixed by the mixer according to the formula. The inner tube is extruded by an extruder and coated on a soft or hard core coated with release agent (the liquid nitrogen freezing method can also use no tube core); The calender is pressed into a laminated rubber sheet, and the spacer is added to roll and cut into a specified width according to the technical requirements; The inner tube of the welded pipe core is wrapped with copper plated steel wire or copper plated steel wire rope on the winding machine or braiding machine, and the middle layer of rubber sheet is synchronically wrapped between each two layers of copper plated steel wire or copper plated steel wire rope on the winding machine or braiding machine, and the beginning and end of the winding steel wire are bound (some early winding machines need to prestress the copper plated steel wire); The extruder is again coated with outer rubber, and then wrapped with lead or cloth vulcanization protective layer; Vulcanization by canister or salt bath; Finally, the vulcanized protective layer is removed, the tube core is drawn out, the upper tube joint is pressed, and the sample pressure inspection is carried out.

In short, the manufacture of high-pressure tubing uses more equipment, more types of raw materials, and the production process is complex. However, in recent years, the production process of hydraulic tubing with plastic or thermoplastic elastomer as the main raw material can be appropriately simplified, but the raw material price is high, and it is still dominated by rubber raw materials