Steel outer tubes are essential for ensuring the durability and performance of polyurethane direct buried thermal insulation pipes. The material properties and dimensional tolerances of the steel outer protective tube must comply with national or industry standards to guarantee structural integrity and long-term service life. Before installation, the outer surface of the steel pipe undergoes shot blasting treatment to enhance adhesion and prevent corrosion, ensuring a strong bond with the insulation layer.
The outer protective tube serves as a critical component in the system, offering multiple functions. It acts as a barrier against groundwater infiltration, protecting the inner insulation layer from moisture damage. Additionally, it provides mechanical support to the core pipe and can withstand external pressures, making it vital for underground applications. Depending on the environment and requirements, the outer protective tube can be made from various materials, such as high-density polyethylene (HDPE), glass fiber reinforced plastic (GRP), or composite materials. However, in areas with high water tables or where there is significant surface water, steel outer protective tubes are typically preferred due to their superior strength and resistance to environmental stress.
In such cases, the use of steel outer tubes is not just recommended but mandatory to ensure the longevity and safety of the entire pipeline system. These steel tubes are manufactured to meet strict quality control measures, ensuring they meet all necessary specifications and performance criteria. Proper surface preparation, including shot blasting, further enhances their durability and compatibility with the insulation material.
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Source: http://news.chinawj.com.cn
Editor: Hardware Business Network Information Center
Image: Xinda Company / Polyurethane Direct Buried Insulation Pipe External Protection Tube Function
[Image Link: http://i.bosscdn.com/blog/10/27/48/112046.jpg]
This content has been revised and expanded to provide a more comprehensive and natural explanation of the role and importance of steel outer protective tubes in polyurethane direct buried insulation systems.
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