Anti-corrosion steel pipe is a common steel pipe. To slow down and prevent the steel pipe from being corrupted and depreciated under the chemical and electrochemical action of internal and external media, or due to the metabolism of microorganisms, it is necessary to do a good job of anti-corrosion of the pipe. In addition to the corrosion protection technology of the conveying medium, most steel pipes for conveying oil and natural gas are in a complex soil environment, and the conveyed medium is 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 fire and endanger people. Therefore, it is necessary to do anti-corrosion work on the pipeline. However, there are many insulation methods for anti-corrosion steel pipes, and different methods must be selected according to different types.
1. How to keep warm
Mainly use uncertain thermal insulation materials (such as expanded perlite, expanded frog stone, asbestos powder, asbestos fiber, diatomite clinker, etc.), add a certain amount of binders (such as cement, water glass, and refractory clay, etc.). Or add a coagulant (such as sodium fluorosilicate or nepheline aminopyrine) to it, choose the proportion of ingredients, add water and mix evenly to form a shaped mud mass, and then apply it directly by hand. Keeps warm for the smear method.
2. Wrap-around insulation
① The winding insulation method is mainly to make the insulation material into a rope shape or a belt shape, and then directly wind it on the pipeline that needs insulation.
②The main insulating materials using this method in life are: slag wool felt, glass wool felt, straw rope and asbestos belt, etc.
3. Prefabricated components for insulation
① Pipe prefabricated thermal insulation structure. When the pipe diameter is DN≤80mm, the semicircular pipe shell is used. If the pipe diameter is DN ≥ 100mm, use fan-shaped or trapezoidal tiles.
②The materials used in the prefabricated products are mainly foamed concrete, asbestos, slag wool, glass wool, expanded perlite, calcium silicate, etc.
4. Filling method to keep warm
①If the insulating material is a bulk material, this method can be used for the removable insulating material.
② During construction, fix the round steel support ring on the pipe wall. The ring is the same thickness as the insulation, then the support ring is wrapped with an iron sheet, aluminum sheet, or wire mesh for insulation filling.
③ This filling method can use prefabricated hard arc bricks with porous material as the support structure, the spacing between them is about 900mm, just like plain wire mesh, according to the outer perimeter of the insulation layer of the pipe, the slag is machined with a circular machine By covering the perimeter of the support, the filling and insulating structure should be made of metal protective shell as far as possible.
Post time: Sep-13-2022