Steel Jacketed Steel Insulated Pipe

• ​Introduction

Steel Jacketed Steel Insulated Pipe, also known as steel-sheathed steel insulated pipe, is a high-temperature resistant prefabricated insulation pipeline composed of an inner working steel pipe, an insulation layer, and an outer protective steel pipe. It is mainly designed for transporting high-temperature media such as steam (up to 350°C) and high-temperature hot water. This type of pipe is widely used in industrial steam transmission, thermal power plant pipelines, and long-distance high-temperature medium transportation systems, featuring excellent thermal insulation stability and structural durability under high-temperature conditions.

• ​Main Functions

High-Temperature Thermal Insulation: The insulation layer (usually composed of refractory materials, glass wool, or aerogel) effectively reduces heat loss of high-temperature media, ensuring energy efficiency in transportation.

Mechanical Protection: The outer steel jacket provides strong resistance to external pressure, impact, and deformation, protecting the inner pipe and insulation layer from damage during construction or operation.

Corrosion Resistance: The outer steel jacket is often treated with anti-corrosion coatings (such as epoxy coal tar pitch or 3PE coating), enhancing its resistance to soil, moisture, and chemical corrosion in buried environments.

Thermal Expansion Adaptation: Designed with sliding structures (internal or external sliding), it accommodates thermal expansion and contraction of the inner pipe caused by temperature changes, avoiding pipeline stress damage.

• ​Tubing Standards

ASTM A53，ASTM A106，ASTM C177-19； EN 10255，EN 10240，EN 13941； GB/T 3091，GB/T 13793，GB/T 9711，GB/T 8163，GB/T 38105，CJ/T 246.

• ​Material & Performance

Working Steel Pipe: ASTM A53: Grade A、B，ASTM A106: Grade A、B、C； EN 10255: S195T、S235JRH、S275JRH、S355JRH； GB/T 3091: Q215A/B、Q235A/B、Q355B, GB/T 8163：10#，20#，Q355，Q420， GB/T 13793: Q195、Q215A/B、Q235A/B、Q355B、Q390B；

Insulation Layer:Mineral wool ，Microporous calcium silicate ，Glass wool, aerogel

Outer Jacket: Carbon steel

Key Performance :

Thermal insulation performance: High-quality thermal insulation materials, such as high-temperature-resistant glass wool, rock wool, or Microporous calcium silicate, have extremely low thermal conductivity, which can effectively reduce heat loss and ensure that the temperature of steam remains stable during long-distance transportation.

Mechanical strength: The working steel pipe is usually made of seamless steel pipe or spiral steel pipe, which has good toughness and strength. The outer jacket steel pipe also has high mechanical strength, which can resist external impact, extrusion, etc.

Anti-corrosion performance: The outer jacket steel pipe undergoes special anti-corrosion treatments, such as coal tar epoxy anti-corrosion, three-layer PE anti-corrosion, etc., which can effectively resist erosion from moisture, chemicals, and microorganisms in the soil. In addition, the working steel pipe can also enhance its anti-corrosion performance by coating with anti-rust layers, etc.

Waterproof performance: As the outer layer protection of the pipe, the outer jacket steel pipe has good waterproof performance, which can prevent moisture from entering the insulation layer and affecting the insulation effect and the service life of the pipe.

Impact resistance: The outer jacket and insulation layer need to have a certain impact resistance to prevent the pipe from being damaged by impact during transportation, installation, and use.