What is used to protect a bottom blow off pipe exposed to direct furnace heat?

The use of fire brick to protect a bottom blow-off pipe that is exposed to direct furnace heat is grounded in the material's ability to withstand high temperatures. Fire bricks are specifically designed to endure extreme heat without degrading or losing structural integrity. They are commonly used in areas where there is direct exposure to flame or intense heat, such as furnace areas, due to their excellent thermal insulation properties.

Additionally, fire bricks help to create a thermal barrier, ensuring the blow-off pipe maintains its integrity and functionality, reducing the risk of damage that could lead to failures or leaks. Their durability and heat resistance make them an ideal choice for applications in high-pressure boilers where safety is paramount.

In contrast, while insulation, steel plating, and fiberglass have their own protective qualities, they may not withstand the high heat levels directly and continuously present in furnace environments in the same way that fire bricks can. Therefore, the unique properties of fire bricks make them the most suitable option for protecting equipment exposed to direct furnace heat.