Anti-corrosion steel pipes are a common type of steel pipe. To slow down and prevent corrosion and deterioration caused by the chemical and electrochemical effects of internal and external media, or by the metabolism of microorganisms, proper anti-corrosion measures are necessary. Besides corrosion protection technologies for the transported media, most oil and natural gas pipelines operate in complex soil environments, and the transported media are also corrosive. Therefore, the inner and outer walls of anti-corrosion steel pipes are highly susceptible to corrosion. Once anti-corrosion steel pipes are corroded and perforated, oil and gas leaks can occur, severely polluting the environment and potentially causing fires and endangering lives. Therefore, proper anti-corrosion measures are essential for anti-corrosion steel pipes. However, there are actually many insulation methods for anti-corrosion steel pipes, and different methods must be selected based on the specific type.

1. Common Insulation Methods for Anti-corrosion Steel Pipes
Anti-corrosion steel pipes mainly use various insulation materials (such as expanded perlite, expanded calcite, asbestos powder, asbestos fiber, and diatomaceous earth clinker), with the addition of a certain amount of binder (such as cement, water glass, and refractory clay). Alternatively, a coagulant (such as sodium fluorosilicate or nepheline aminopyrine) can be added, the component ratio can be selected, water can be added and mixed evenly to form a shaped mud lump, and then it can be directly and evenly applied by hand. This application method is called the coating method for insulation.

2. Wrapping Insulation of Anti-corrosion Steel Pipes
① The wrapping insulation method for anti-corrosion steel pipes mainly involves making the insulation material into rope or strip shapes and then directly wrapping it around the pipe that needs insulation.
② The main insulation materials used in this method in daily life include: slag wool felt, glass wool felt, straw rope, asbestos tape, etc.

3. Prefabricated Components for Insulation of Anti-corrosion Steel Pipes
① Prefabricated insulation structures for anti-corrosion steel pipes. When the diameter of the anti-corrosion steel pipe is DN≤80mm, a semi-circular pipe shell is used. If the diameter of the anti-corrosion steel pipe is DN≥100mm, fan-shaped or trapezoidal tiles are used.
② The materials used in prefabricated products are mainly foamed concrete, asbestos, slag wool, glass wool, expanded perlite, calcium silicate, etc.


4. Insulation Filling Method for Anti-corrosion Steel Pipes
① If the insulation material of the anti-corrosion steel pipe is bulk material, this method can be used for removable insulation material.
② During construction, round steel support rings are fixed to the pipe wall of the anti-corrosion steel pipe. The thickness of the ring is the same as the thickness of the insulation layer. Then, iron sheets, aluminum sheets, or metal wire mesh are used to wrap the support rings for insulation material filling.
③ This filling method can use prefabricated porous hard arc bricks as the support structure. The spacing between them is approximately 900mm, similar to plain weave metal wire mesh. Based on the outer circumference of the insulation layer of the anti-corrosion steel pipe, slag processed by a circular machine is used to cover the perimeter of the support. The filling and insulation structure should be made of a metal protective shell as much as possible.