Heat-insulating Pipe

Tianjin Lefin Industrial Co., Ltd is one of the most experienced manufacturers and suppliers of heat-insulating pipe in China. Please feel free to buy high quality heat-insulating pipe from our factory. Good service and reasonable price are available.

The heat-insulating pipe is a steel pipe that has undergone special insulation treatment. Its main function is to reduce the heat loss of the pipeline during the transportation of media (such as hot water, steam, crude oil, etc.), ensuring that the temperature of the medium meets the requirements, and effectively preventing the influence of the external environment on the pipeline.

The heat-insulating pipes mainly have two structural types, which are respectively applicable to different working conditions:

1. Steel-bonded steel composite insulation pipe

This structure is mainly used for transporting high-temperature steam (up to 150℃ - 450℃) and other high-temperature media. It adopts a "tube-in-tube" design. Depending on the different sliding methods inside, it is divided into two types: inner sliding type and outer sliding type.

◦ Inner sliding type: From the inside to the outside, it is the working steel pipe, silicagel/reducing resistance layer, microporous calcium silicate insulation layer, polyurethane insulation layer, and the outermost layer is the outer jacket steel pipe and the outer anti-corrosion layer. Its characteristic is that the insulation layer slides together with the working steel pipe inside the outer jacket steel pipe.

◦ Outer sliding type: The structural layer from the inside to the outside consists of the working steel pipe, the high-temperature resistant glass wool insulation layer, the aluminum foil reflective layer, the air insulation layer, and the outer protective steel pipe at the very outside. This structure allows the working steel pipe to freely expand and contract thermally within the insulation layer.

The advantages of steel-concrete composite pipes lie in their high strength and long service life. They can be directly buried underground and do not require the construction of large pipe trenches. They are particularly suitable for high-temperature steam pipeline projects.

2. Polyurethane Insulation Pipe
This is a widely used structure at present, commonly seen in centralized heating, oil transportation, etc., for the transmission of medium-temperature media (usually ranging from -50℃ to 150℃). It adopts a classic three-layer design:

◦ The first layer: Working pipe: In direct contact with the transported medium, seamless steel pipes, spiral steel pipes, etc. can be selected as per requirements.

◦ Second layer: Polyurethane insulation layer: Through high-pressure foaming technology, hard polyurethane foam plastic is injected into the cavity formed between the working pipe and the outer protective layer. This material has an extremely low thermal conductivity, which can significantly reduce heat loss.

◦ Third layer: High-density polyethylene (HDPE) protective layer: Pre-manufactured plastic pipes, their function is to protect the inner insulation layer from being damaged by mechanical hard objects, and to play a crucial role in anti-corrosion and waterproofing.

Compared with traditional trench or overhead laid pipelines, the heat-insulating pipe has significant advantages:

• Energy-saving and efficient:

The heat loss is only about 25% of that of traditional pipes, which can save a large amount of energy over the long term.

• Comprehensive cost reduction:

It can lower the project cost by 10% to 25%, significantly reduce the amount of earth excavation and concrete usage (up to 50% or more), and shorten the construction period by approximately 50%.

• Long lifespan and stability:

With correct installation and usage, the service life can reach 30 to 50 years, and the maintenance cost is low.

• Safety Intelligence:

A leakage alarm system can be set up. In case of any leakage at a certain location, it can automatically detect and precisely locate the faulty point, ensuring the safe operation of the pipeline network.

Due to its excellent performance, the heat-insulating pipe is widely used in various fields:

• Urban centralized heating pipelines
• Industrial pipelines for petroleum, chemicals, etc. (such as hot oil transportation)
• The cold and hot water pipes of the central air conditioning system
• Municipal engineering projects and other situations requiring heat insulation and cold preservation

In simple terms, you can think of the insulation steel as a "thermal insulation cup" tailor-made for pipelines. Its core value lies in using a special composite structure to ensure strength while achieving efficient insulation, long-term corrosion prevention, and convenient construction.

Ultimately, this leads to energy conservation, cost reduction, and a decrease in overall expenses.