How to choose steel structure fireproof coating?

 When selecting fireproofing coatings, the following points should be noted?

fireproof coating

(1) Don't use the finish type fireproof coating for steel structures, the finish type fireproof coating is the fire retardant coating to protect the combustible substrate such as wood structure, and the thin coating film can't reach the purpose of improving the fire resistance limit of steel structure.

(2) Thin-coated steel structure intumescent fireproof coating should not be used to protect steel structures with a fire resistance limit above 2.5h.

Thin-coated intumescent fire-resistant coating is not too long fire-resistant limit is determined by its own raw materials and fire prevention principles. This type of coating contains more organic components, coating at high temperatures will cause physical and chemical changes, and the formation of carbonaceous bubble film can play a role in heat insulation. Expanded bubble film strength is limited, easy to crack, and fall off, charcoal at a high temperature of 1000 ℃ will gradually gray out.

For a steel structure with a fire resistance limit of 2.5h or more, a thick-coated steel structure with a fireproof and heat-insulating coating must be used. 

(3) Indoor steel structure fireproof coating shall not be used directly for spraying protection of outdoor steel structures without improvement or effective waterproof measures.

The environmental conditions of open-air steel structures are much harsher than indoor, fully exposed to sunlight and atmosphere, sun and rain, wind and snow cover, so it is necessary to choose water-resistant, freeze-thaw cycle-resistant, aging-resistant and able to withstand acid, alkali, salt, and other chemical corrosion of the outdoor steel structure fireproofing coatings for spraying protection.

(4) In general, indoor steel structure fire protection should not choose outdoor steel structure fireproof coating, to ensure the excellent performance of outdoor steel structure fireproof coating, its raw material requirements are strict, and need some special materials, so its price is much more expensive than indoor steel structure fireproof coating. However, for semi-open-air or some wet environment steel structures, it is suitable to choose outdoor steel structure fireproof coating for protection.

(5) Thick-coated fireproof coating is basically composed of inorganic material, with stable coating and slow aging speed, as long as the coating does not fall off, the fireproof performance is guaranteed. From the consideration of durability and fire resistance, it is appropriate to choose a thick-coated fireproof coating.

With the progress of technology, the fire resistance limit of 2h above the thin coating type fireproof coating also has related products, but at present its market price is expensive, is the conventional thick coating type fireproof coating several times or even a dozen times, so the actual project used less.

Explore the endless possibilities at 

https://www.cnxzlf.com

评论

发表评论

此博客中的热门博文

Several cutting methods of steel structure space frame

图片
  Steel st ructure space frame s are now widely used, such as galvanized steel warehouse , glass dome building , airport hangar ,steel structure warehouses, hall roofs, gymnasiums, etc. The builder will cut, produce, and process according to the customer's requirements. There are many ways to cut steel structure space frame s, which will help you to have more choices of cutting. Then, the space frame   manufacturers below will give us a detailed description of several common cutting methods. The cutting methods of the steel structure space frame   are as follows: 1. Flame cutting by CNC machine tools: that is to say, use oxygen cylinders to oxidize and melt steel at a high temperature continuously. At present, natural gas is generally available, which is relatively reliable. 2. Waterjet cutting machine: Generally, high-pressure flowing water is used for cutting, and the accuracy is very high. It is often cut in some very thin, medium-thick steel that requires precision machining,
阅读全文

What are the advantages of steel over traditional concrete?

图片
  steel warehouse Steel structures offer several advantages over traditional concrete structures that cover a wide range of areas, including speed of construction, flexibility, sustainability, and more. Here are some common advantages of steel construction:   Lightweight and High Strength: Steel is a lightweight and strong building material. Compared to concrete, the use of steel reduces the dead weight of the building, which in turn reduces the load on the foundation and lowers the overall weight of the building.   Fast construction: Steel structures can be prefabricated in a factory and then simply assembled on site. In contrast, traditional concrete structures typically require more on-site pouring and maintenance time. As a result, steel structures are often faster to construct, helping to shorten project duration.   Design Flexibility: Steel structures are strong and malleable and can support large spans and diverse building designs. This gives designers more flexibility in creat
阅读全文

Lifting construction of the starting unit frame of the large-span arched space frame

图片
The space frame structure has good structural performance and a wide range of applications, especially for the installation of long-span steel structures. It has the advantages of saving steel, manufacturing technology, and convenient installation and construction. It is widely used in large-scale power generation facilities, petrochemical, coal f ields and other industries. In the construction of coal yards, in the past, most of the coal yards were piled in the open air, which caused great environmental pollution and affected the normal use of the coal yards. The coal raw material workshops of thermal power plants required relatively large building areas and spans (currently, the domestic span has reached 120m above), so that the steel space frame shell structure is widely used in the raw material dry coal shed workshop. The shell structure of the space frame of the dry coal shed has the characteristics of large span and high vertical height. During the construction process, it is ne
阅读全文