How to Extend the Service Life of Electric Heating Tubes through Daily Maintenance
2018/10/17 Reading (104)
How to extend the service life of electric heating tubes through daily maintenance
1. The heating part of the electric heating tube should be fully immersed in the heating medium to avoid damage caused by heat not dissipating quickly and exceeding the allowable heating temperature. In addition, the wiring lead-out part should be exposed outside the insulation layer of the heater or outside the heater, so that this part does not overheat and get damaged.
2. The input power supply voltage should not exceed 10% of the rated voltage indicated on various electric heating tubes. If it is applied below the rated voltage, the heat generated by the electric heating tube will also decrease accordingly.
3. When wiring the terminals of the electric heating tube, use two nuts to fasten them relatively tightly. Do not use excessive force to avoid loosening the lead-out screws and damaging the electric heating tube.
4. The terminals of the electric heating tube should be kept clean and dry; otherwise, the insulation performance will be reduced and cause short circuit breakdown. If used in environments with chemical corrosion, flammable, explosive liquids or gases, the wiring part of the electric heating tube should be protected with an insulating sealing device to prevent accidents.
5. When heating certain substances such as adhesives, like sodium nitrate, stearic acid, paraffin, etc., the power supply voltage should be reduced at the beginning of heating to lower the heat output of the electric heating tube. After all is melted into liquid, then raise to the rated voltage for heating.
6. When selecting an electric heating tube, special attention should be paid to the heating medium. It should have no corrosive effect on the shell material of the electric heating tube.
7. If the electric heating tube is used for a long time and thick scale or oil dirt accumulates on the surface, it should be removed regularly; otherwise, the heat transfer performance of the electric heating tube will decrease, causing the surface heat load to exceed the rated allowance and damage the tube.
8. Electric heating tubes should be stored in a dry warehouse. If they are placed for a long time and the surface is damp, use a megohmmeter to measure the insulation resistance before use. If it is less than 1 megohm/500 volts, the electric heating tube should be dried in a drying oven at 200 degrees.
9. Special electric heating tubes should be read carefully before installation and use to avoid damage.
