Why do some electric heating tubes burst easily? (I. Components and tubes)
2. Electric heating tube outer tube for seamless tube material, shell stainless steel tubing because the wall thickness is too thin, the wrong choice of material, or quality problems, may also lead to easy cracking of the heating tube.
the common quality issues include: tiny pinholes on the surface of the element
Components of the shell should be sealed, but in the production process sometimes the tube shell does appear tiny pinhole phenomenon, in practice with the use of the formation of scale corrosion pinhole enlargement and leakage, resulting in bursting the tube.
The causes of pinholes are broadly as follows.
A, seamed tube congenital existence: seamed welded stainless steel tube due to the welding process (steel belt burr, steel belt missing edge, welding defects) there may be such a tiny pinhole, this tiny pinhole is generally difficult to pick up.
B, components due to the production process: the production process due to the bending r too small or bending before no heat treatment, so by the bending of the product in the bend sometimes there are tiny cracks, so that the product will leak after long-term use and burn the modified magnesium oxide and cause a burst tube.