Structural Design Principles Of Industrial Heating Pipes
1. When designing the heating tube, the effects of thermal expansion and contraction, ablation, oxidation, and creep should be considered to avoid failure due to deformation during normal operation.
2. The design of the internal structure of the heating tube should ensure that the highest temperature of the material selected for the manufacture of the heating tube or the highest temperature that may be encountered in its processing is not damaged, and it can still work reliably.
3. The welding structure design of the heating tube should meet the relevant standards. The welding seam of the heating tube under pressure, especially the part in the container, should be as few as possible, and the setting of the welding seam should be easy to check.
4. The design of the pressure-bearing heating tube shell and its accessories must meet the relevant standards.
5. The heating tube (including the end) must be sealed.
6. The heating tube used for heating the corrosive medium must be a corrosion-resistant metal tube or have a protective sleeve to ensure the working life of the heating tube.
7. When the heating tube shell is made of ordinary steel or other alloy materials with better performance than ordinary steel, its wall thickness should not be less than 0.35mm. When the shell is made of copper or copper alloy materials, it must be made according to the corresponding mechanical strength. Adapt to the harsh working environment.
8. The bending radius of the heating tube should not be less than 2.5 times the diameter of the heating tube.
9. The curved shape of the heating tube must ensure that the inner end of the lead rod is on the straight part of the tube, and the distance from the bending start point should not be less than 10mm.
10. The direction of the two intercepting parts with a potential difference greater than 40V in the heating tube, the gap between the intercepting part and the shell, and the thickness of the insulating filler should not be less than 1mm, and the distance between the exposed lead wire and the shell should not be less than 1mm. (Note: If there is an agreement, the above gap and distance can be less than 1mm, but the design needs to be strengthened and carefully manufactured to ensure performance and reliability).
