Anti-corrosion steel pipe is a common steel pipe. To slow down and prevent the steel pipe from corroding and depreciating under the chemical and electrochemical effects of internal and external media, or due to the metabolism of microorganisms, it is necessary to do a good job in anti-corrosion of the pipe. In addition to the corrosion protection technology for transporting media, most steel pipes transporting oil and natural gas are in a relatively complex soil environment, and the transported media are also corrosive, so the inner and outer walls of the pipeline are likely to corrode. Once the steel pipe is corroded and perforated, it will cause oil and gas leakage, which will not only seriously pollute the environment, but also cause fires and endanger people. Therefore, it is necessary to do anti-corrosion work on pipelines. However, there are many insulation methods for anti-corrosion steel pipes, and different methods must be selected according to different types.
1. Ways to keep warm
Mainly use uncertain insulation materials (such as expanded perlite, expanded frog stone, asbestos powder, asbestos fiber, and diatomite clinker, etc.), and add a certain amount of binders (such as cement, water glass, refractory clay, etc.). Or add a coagulant (such as sodium fluorosilicate or nepheline aminopyrine) to it, select the proportion of ingredients, add water, and mix evenly to form a shaped mud ball, and then apply it directly with your hands. People call this application method Keep warm for the smear method.
2. Wrapped thermal insulation
① The winding insulation method mainly makes the insulation material into a rope or strip shape, and then directly wraps it around the pipe that needs to be insulated.
②The main insulation materials used in this method in daily life are: slag wool felt, glass wool felt, straw rope asbestos tape, etc.
3. Prefabricated components for thermal insulation
①Prefabricated insulation structure of pipelines. When the pipe diameter is DN≤80mm, a semicircular pipe shell is used. If the pipe diameter is DN ≥ 100mm, use a sector or trapezoidal tiles.
②The materials used in prefabricated products are mainly foam concrete, asbestos, slag wool, glass wool, expanded perlite, calcium silicate, etc.
4. Filling method for thermal insulation
① If the insulation material is bulk material, this method can be used for removable insulation material.
② During the construction process, fix the round steel support ring on the pipe wall. The thickness of the ring is the same as the thickness of the insulation layer, and then the support ring is wrapped with iron sheets, aluminum sheets, or wire mesh to fill with insulation material.
③ This filling method can use prefabricated hard arc bricks of porous material as the supporting structure, with a spacing of about 900mm between them, just like plain wire mesh, and use a circular machine to process the slag according to the outer circumference of the insulation layer of the pipe Filling and insulating structures should be made of metal protective shells wherever possible by covering the perimeter of the supports.
Post time: Dec-28-2023