As the core component of the electric heater, the electric heating tube needs to be inspected before leaving the factory. Today, we will reveal the factory standard of the electric heating tube industry to ensure the safe use of the electric heating tube after leaving the factory.
1. Inspection of the appearance of the electric heating tube
The metal tube of the electric heating tube must not have obvious scars or local expansion, and there must be no wrinkles, bumps, etc. at the bend; the coating, electroplating layer, metal or non-metal spray coating, and aluminizing layer should be uniform and firm, and there should be no bubbles or peeling Or local accumulation and other phenomena; there are also electric heating tube size deviation inspection; electric heating tube length deviation inspection.
2, rated power measurement
Measuring the rated power is determined by measuring the cold resistance.
3, cold insulation resistance measurement
The cold insulation resistance value should not be less than 50MΩ.
4, cold insulation withstand voltage test
Test the withstand voltage according to the customer's regulations, and there is no flashover and breakdown in 1min. The normal insulation withstand voltage is 1300V, 1600V, and the highly demanded insulation withstand voltage is 2400V, etc.
5, water pressure test
The components used to heat the liquid and whose joints are installed below the liquid surface shall be able to withstand a hydrostatic pressure test of 0.5Mpa for 5 minutes without leakage. For components with a pressure of more than 0.1Mpa, a water pressure test must be carried out for 30 minutes. There should be no leakage, no visually distinguishable deformation or deformation that affects performance. The test pressure should be greater than or equal to 1.25 times the design pressure, and not Less than 0.5Mpa.
6. The last step is packaging inspection.
The factory standards of electric heating tubes are all tested by these parameters. After receiving the goods, customers can also test them according to the above 6 points!