Nitrile rubber (NBR) petroleum conveying rubber hose

Petroleum media often contain sulfides, acidic substances, and solid particles, while chemical transportation involves corrosive substances such as strong acids, strong bases, and organic solvents. In response to such demands, pipeline material research and development focuses on three major directions:

 

Rubber substrate optimization: Nitrile rubber (NBR) has become the preferred choice for petroleum transportation due to its excellent oil resistance. Its acrylonitrile content directly affects its corrosion resistance, and a high acrylonitrile formula can reduce hydrogen sulfide permeability by 40%. Hydrogenated nitrile rubber (HNBR), through hydrogenation treatment, expands its temperature range to -40 ℃ to+150 ℃ while maintaining oil resistance, making it suitable for deep-sea oil fields and high-temperature refining scenarios.

Application of composite materials: Polytetrafluoroethylene (PTFE) lining technology combines "plastic king" with rubber matrix, making the pipeline have both PTFE's strong corrosion resistance (able to resist concentrated sulfuric acid, aqua regia, etc.) and rubber's flexibility. A certain type of deep-sea oil pipeline adopts a three-layer structure: the inner layer is PTFE corrosion-resistant, the middle layer is steel wire wrapped to enhance pressure, and the outer layer is chloroprene rubber (CR) resistant to ultraviolet aging. It has been successfully applied in oil and gas fields at a depth of 3000 meters in the South China Sea.

Nano modification technology: Adding nano silica or carbon nanotubes into the rubber matrix can significantly improve the wear resistance of pipelines. Experimental data shows that the nano modified rubber hose reduces the wear rate by 65% compared to traditional materials when transporting sand containing crude oil, and extends the service life to more than 8 years.

2、 Structural Design: Mechanical Balance in High Pressure Environments

High pressure chemical specialized pipes need to meet both 10-35MPa working pressure and complex medium transmission requirements, and their structural design presents three major features:

 

Multi layer reinforcement system: adopting a composite structure of "inner adhesive layer+steel wire winding layer+outer adhesive layer", in which the steel wire winding layer forms a spiral mesh structure through cross weaving, generating pre tension force when subjected to internal pressure, which increases the pressure bearing capacity of the pipeline by three times. A certain type of hydraulic support uses a high-pressure pipe designed with six layers of steel wire winding, with a burst pressure of 225MPa, far exceeding industry standards.

Dynamic compensation mechanism: Design a corrugated tube compensation structure for the thermal expansion, contraction, and mechanical vibration of pipelines in chemical plants. This structure absorbs displacement through the elastic deformation of metal corrugated pipes, combined with the shock absorption function of rubber flexible joints, allowing the pipeline system to maintain sealing within a displacement range of ± 50mm, effectively preventing leakage at flange connections due to stress concentration.

Modular interface design: using quick connect clamps or union joints to achieve quick disassembly and angle adjustment of pipeline systems. A certain type of rotatable joint, with a spherical sealing structure, allows the pipeline to freely swing within a range of ± 15 °, making it particularly suitable for space limited scenarios such as offshore platforms.

3、 Application scenario: Breakthrough in adaptability to extreme working conditions

In the ultra deep well operation of Tarim Oilfield, corrosion-resistant rubber hoses need to withstand a high temperature of 135 ℃ and a wellhead pressure of 120MPa, while also resisting the corrosion of high concentration chloride ions in drilling fluid. By using a composite structure of hydrogenated nitrile rubber lining and titanium alloy reinforcement layer, the pipeline system achieves continuous operation for 2000 hours without leakage. In chemical industrial parks, high-pressure chemical specialized pipes need to deal with the infiltration of volatile organic compounds such as benzene and methanol. A certain type of double-layer tube can detect small leaks in real time by setting a vacuum monitoring layer between the inner PTFE layer and the outer rubber layer, reducing the safety warning time from 2 hours in traditional methods to 15 minutes.

 

From deep-sea oil and gas fields to chemical industrial parks, from polar drilling platforms to desert refining bases, corrosion-resistant rubber hoses for oil transportation and high-pressure chemical specialized pipes are building modern industrial safety barriers through material innovation and structural optimization. With the integration of cutting-edge technologies such as nanotechnology and intelligent monitoring, these two types of special pipelines will inevitably evolve towards higher pressure resistance, stronger corrosion resistance, and greater intelligence, providing key support for global energy transformation and chemical industry upgrading.