1. Outer cladding. The outer cladding is added to the surface of the seamless steel tube, which can be cast-in-place or sprayed. The cast-in-situ solid concrete outer cladding is usually reinforced with steel wire mesh or steel bars to limit shrinkage cracks and ensure the strength of the outer shell.

2. Fill with water. Filling the hollow seamless steel pipe with water is the most effective protective measure against fire. This method can keep the seamless steel pipe at a low temperature in the fire, water circulates in the seamless steel pipe, and absorbs the heat of the material itself. The heated water can be recirculated after cooling, or cool water can be introduced through pipes to replace the heated water.

3. Shield. The seamless steel pipe is installed in the wall or ceiling made of refractory materials, or the components are hidden in the gap between the two walls. As long as a little refractory material is added or not added, the purpose of fire prevention can be achieved. This is the most economical method of fire protection.