1. The heating tube surface load is too large, resulting in magnesium oxide powder forming carbon
2. Resistance wire heating is not uniform
3. The resistance wire is not firmly in contact with the lead rod, resulting in excessive instantaneous current
4. Incomplete moisture discharge in the pipe, resulting in water vapor
5. Heating tube wall thickness is not up to standard, and welding seam is not firm
The above points are the factors that will cause the electric heating tube to explode
