How to judge the quality of electric heating tubes? How to choose correctly?

How to judge the quality of electric heating tubes? How to choose correctly?

When people have a demand for purchasing electric heating tubes, they will compare suppliers and hope to buy the most cost-effective electric heating tube. How can we determine the quality of the supplied electric heating tubes after preliminary inquiry, communication, sample comparison, and final determination of the supplier? In fact, the components that mainly affect the quality of electric heating tubes include the shell, heating wire, magnesium oxide powder, sealing materials, etc. The selection principles are generally high temperature resistance and corrosion resistance.

Common electric heating pipes are generally made of stainless steel (304 is the most commonly used material, and if there is corrosion, 316 or 316L are generally selected according to the situation, and 310S is selected when high temperature is required). If the specific construction environment is not known when making heating pipes, stainless steel 304 material is generally chosen as the outer shell because stainless steel 304 has good plasticity. If the heating environment is highly corrosive, titanium alloy and polytetrafluoroethylene are generally chosen because they have good corrosion resistance.

The reasonable selection of electric heating pipes is a prerequisite for ensuring the quality of heating pipes, and plays a crucial role in the future use effect and service life. For the selection of electric heating tubes, we mainly consider their effectiveness, lifespan, and price. Choosing a suitable electric heating pipe first requires knowing its working environment, selecting reasonable materials based on the working environment, and then calculating the correct heating power. Among the factors that affect the quality of electric heating tubes, the quality of materials is a very important factor.

In addition, choosing an electric heating tube should also consider whether the design is reasonable? This includes the power of the electric heating tube and the selection of the outer tube material. The power design of electric heating tubes requires comprehensive consideration of various factors, mainly calculated based on their surface load, and the requirements for surface load of electric heating tubes for liquid heating and air dry burning are also different.

After receiving the electric heating tube, the quality inspection department should inspect its electrical performance, including the inspection of the outer tube: the outer surface is intact, bright, firmly welded, the welding joint is beautiful, the bend shape is well formed, symmetrical, the sealing silicone is uniform, and there are no glue impurities in the screw teeth; Power, resistance within tolerance range, power (+5%, -10%), resistance value (+10%, -5%); The insulation resistance value should be greater than 1000M Ω; Leakage current ≤ 0.5mA; Conduct a water pressure test (requiring no water leakage or seepage at each welding point of the heating pipe under a pressure of 1.2Mpa, with a pressure holding time of 5 minutes), etc.

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