How to extend the service life of electric heating tubes through daily maintenance

How to extend the service life of electric heating tubes through daily maintenance

1. The heating part of the explosion-proof electric heating tube should be fully immersed in the heating medium to prevent the heat from dissipating too quickly and exceeding the allowable heating temperature, causing damage to the electric heating tube. In addition, the wiring outlet should be exposed outside the insulation layer or heater to prevent overheating and damage.

2. When inputting power, the voltage should not exceed 10% of the rated voltage indicated on various electric heating tubes. If applied below the rated voltage, the heat generated by the electric heating tube will also decrease accordingly.

3. When connecting the terminals of the electric heating tube, two nuts should be tightened relative to each other. Do not use too much force to prevent the screws from loosening and causing damage to the electric heating tube.

4. The wiring terminals of the electric heating tube should be kept clean and dry. Otherwise, it will reduce the insulation performance and be short circuited and broken down. If it is used in an environment with chemical corrosion, flammable, explosive liquids or gases, the wiring part of the electric heating tube should be tightly protected with insulation sealing devices to prevent accidents.

When heating certain substances such as adhesives, such as sodium nitrate, stearic acid, paraffin, etc., the power supply voltage should be lowered at the beginning of heating to reduce the heat generation of the electric heating tube. When all of them are melted into liquid, they should be raised to the rated voltage for heating.

When selecting an electric heating tube, special attention should be paid to the heating medium. The material of the electric heating tube shell should have no corrosive effect.

7. If the electric heating tube is used for a long time and there is a thick accumulation of pipe scale and oil scale on the surface, it should be removed regularly, otherwise it will reduce the heat transfer performance of the electric heating tube and cause the surface heat load of the tube to exceed the rated allowable value and be damaged.

8. Electric heating tubes should be stored in a dry warehouse. If the surface is damp due to long-term storage, a megohmmeter should be used to measure the insulation resistance before use. If it is less than 1 megaohm/500 volts, the electric heating tube should be placed in a 200 degree drying oven for drying.

9. Special electric heating tubes should be carefully read the relevant instructions before installation and use to avoid damage.

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