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tubular heater heating element Testing methods and criteria
Dec 21, 2017

tubular heater heating element Testing methods and criteria

The specific test method for electric heating pipe can be seen in the national standard "JB / T 2379-1993 Metal Tubular Electric Heating Element", "GB / T 23150-2008 Tubular Heater for Water Heater", "JB / T 4088-1999 Daily Tubular Electric Heating Element" ; Its standard provides the main technical requirements of electric heating, experimental methods, inspection rules, packaging, storage and a series of requirements

Electric tube quality depends on the quality of the following areas: electrical strength, insulation, leakage current, power accuracy, life, corrosion resistance, size and so on.

1, Power input test: to the rated voltage power, the power deviation can not exceed the table below

Rated power input

(W)

Deviation


W≦200

±10%

W>200

+5% or 20W(with big)

-10%

Rated power input

(W)

Deviation


W≦200

±10%

W>200

+5% or 20W(with big)

-10%

2, electrical strength test:

A. Cold electric strength: should be able to withstand 50Hz, 1min pressure, cut off the current 5mA, no breakdown, flashover phenomenon.

Rated voltage test voltage

250V 1250V

B. Working temperature electrical strength: withstand 50Hz, 1min pressure, cut off the current 5mA, no breakdown, flashover phenomenon.

Rated voltage test voltage

250V 1000V

3, the operating temperature of the leakage current

Electric tube in the full exothermic conditions, to 1.15 times the rated power input, leakage current 0.5m A.

4, overload test

Electric tube in the full exothermic conditions, to 1.27 times the rated power power 1hrs, power to cool 0.5hrs to room temperature (allowing the use of forced cooling), so repeated 30 cycles, no damage.

5, electric heating pipe shell sealing test (pipe cracking test)

Electrothermal tube immersed in acidified water (2% ~ 3% hydrochloric acid, sulfuric acid or nitric acid) 3hrs, both ends of the heating tube should be exposed at least 5mm, after the test should meet the performance requirements of the first two to three.

6, sealing sealing test

The electric heating tube placed in the temperature of 60 ℃, humidity 95% of the environment 24hrs, placed after the performance should meet the first 2 to 3 requirements.

7, life test

Heating tube in the full exothermic conditions, the rated voltage power 1hrs, power cooling 0.5hrs to room temperature (allowing the use of forced cooling), the cumulative working time of 3000hrs. 


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