Customer always give feedback about the immersion heater tube explosion phenomenon when it is working.
Today, we summary some reason for this problem:
1. When the heater element is damp and the insulation resistance is lower than 10 megohm, it is easy to cause the insulation breakdown and explosion of the heating tube.
2. If the connection of heating connecting rod and heating wire is a wire smashing connection, the bottom of the wire is cylindrical. In the process of loading powder, the tube may be hollow or not dense after shrinking.
After long-term heating, due to poor thermal conductivity and slow heat dissipation, the heating wire is fused or melted and broke down the tube.
3. There will be scale or oil scale on the surface when heating oil or water, oil scale and scale will directly affect the heat transfer of heating tube, electric heating tube is easy to burn out due to high internal temperature,causing serious explosion.
4. High temperature magnesia powder will be used in the heater element as high level quality. Working temperature of high temperature powder need to be less than 800 ℃, but some design of the surface load is very large (that the power per meter is big in the hot zone), once the dehydration dry, temperature continues to rise, will soon reach above 1000 ℃, this will lead to magnesium oxide powder burning; In the long run, the insulation performance of magnesium powder decreases, resulting in electric leakage explosion tube.
