This standard specifies the high voltage test method for glass-lined equipment used in corrosive conditions. The purpose of the high voltage test is to detect and locate defects in the glass-lined layer that extend to the metal substrate and weak points in the glass-lined layer. GB/T 7993-2003 High voltage test method for glass-lined equipment used in corrosive conditions GB/T7993-2003 Standard download decompression password: www.bzxz.net

1CS73.125.99125.220.55
National Standard of the People's Republic of China
GB/T7993——2003
Generation 8T79931087
High Voltage Test Method for Glass Equipment Used in Corrosive Conditions
Vitreous and porcelain enanet-Enamelled articles fot serviceunder highly corrosive conaitioxs--ltlgh VoltagetestS02746.98.M
2003-06-16 Issued
People's Republic of China
General Administration of Quality Supervision, Inspection and QuarantinebzxZ.net
2004-01-01 Implementation
GH/T7993—2003
This standard adopts 1999 Standard 2746:1999 Glass equipment under strong corrosion conditions: Commercial voltage test method (English version).
This standard was newly drafted on 1999 Standard 2746:1993. This standard has made the following modifications when adopting 274,1. The relevant technical differences have been shortened in the text and marked with vertical single points at the places where they are located: 6.2 of the first standard 1S0274:100 stipulates that the maximum benefit of the glass layer during high-voltage test is 30:100%; Considering the temperature of the Chinese point card, this standard stipulates that it is 40. If the temperature is relatively strict, the test at 13℃ is more stringent. For ease of use, the following editorial modifications have been made to the standard [577451998]: "This standard" has been included in the "this standard", and the foreword of 1S02746:158 has been deleted. This standard BT73- 148 High voltage test method for glass equipment under reverse corrosion conditions. The main changes of this standard /7993-19 are as follows:
The minimum pressure and minimum thickness of the glass are changed (1) The error of the direct current self-pressure of the empty device is changed from 10~% to 35% to 4.1! This standard is proposed by the China Shishan Chemical Industry Association. This international standard is the national glass equipment industry cosmetics committee. The leading units of this standard are Dahua Chemical Machinery and Automation Research and Design Institute, Shenyang Qiuhua Testing Instrument Factory, and Tianzhu City Sanye Porcelain Factory. The main parties to this standard are: product, sample, and policy. The size version of the standard replaced by this standard is: GT/T 1393—1967
1 Scope
High voltage test method for glass equipment under corrosive conditions
This standard specifies the high voltage test method for glass equipment under corrosive conditions. GB/T7993—2003
The purpose of this test method is to measure and locate the multi-point in the glass layer of the new type of glass layer on the metal matrix. This test method is applicable to the detection of the voltage not less than 2kV and the thickness of the nanostructured layer not less than 660μm. 2 Terms and definitions
The technical terms and definitions applicable to this standard are: 2. 1
Weak pointweakspo
refers to the area where the thickness of the contact layer is lower than that of the high voltage layer due to the presence of gas, light, and cracks.
3 Principle
The high and low voltage transmitter applies a specified DC voltage of 2k to the end layer, and detects the defects in the wall layer through spark discharge and the light and (or) sound emitted by the voltage generation. 4.1 High voltage generator and high voltage generator can give a direct current of not less than 2kV (see 5.1) with a total error of 5%. The total internal resistance of the high voltage generator must be sufficient: the arithmetic mean of the current in the circuit is m~m, and the maximum value of the current during spark discharge should be between 1A and 111A. The maximum direct current of each pulse discharge is 25A. To ensure reliable grounding of the negative slow bed with a small occurrence of this small occurrence, a long and suitable positive test electrode should be connected to the test electrode. 4.2 Test board
4.2.1 Insulated metal board
4.2.2 Brush
It should be made of high-alloy and should not be affected by sparks at all. It should cover as much as possible when sweeping across the surface of the nanowire.
4.2.3 Protection type
Place a protection resistor between the test board and the test electrode. The peak value (1CmA m) of the spark should be estimated to be greater than the value in the car, and the discharge caused by dust and other pollution should be considered to reduce the effect of the supply expansion. 4.3 Alarm system
Can give a clear light and (or) sound signal when discharging: 5 Sample
Method: Take the product as the example, and the sample, GH/T7993-2003
Connection method and number of samples of the product must be negotiated. 6 Inspection step
6, 1 Test pressure The final use of the glass equipment, the absolute image and the temperature of the glass environment should be considered. The test voltage should be at least equivalent to the breakdown voltage of the air room with the same temperature (glass layer). Note 1: The thickness of the glass layer must be connected to GL/T7991. Note: The breakdown voltage between the midpoint and the ball in the air is about 16.2. During the test, it should be ensured that:
) The surface of the glass layer is kept fresh and clean
1h) The temperature of the layer is not higher than 40℃ on the dew point day:) The rest of the body must be reliable, || tt||6.3 Turn on the voltage and apply the center pressure value according to the test requirements. Move the brush so that the brush covers as large an area as possible. The maximum speed of the brush movement is cm/cm. The test voltage is the same as the specified voltage. If the voltage on the brush is reduced by only 1% and no spark is generated, the cause should be checked and eliminated (see 6.2).
Mark the detected defects or weaknesses and measure the thickness of the glass at the core point. The test report should include the following contents:
Number of samples, sampling method, and sample delivery unit!
5) Test positive!
) Number and position of the center point;
) Thickness of the glass layer at the defect;
e) Tester, test unit, and tester: Name and code of the standard based on which the test is conducted.
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