GB/T 7991.6: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7991.6-2025 | English | RFQ |
ASK
|
3 days [Need to translate]
|
Test method of viterous and porcelain enamels - Part 6: High voltage test
| Valid |
GB/T 7991.6-2025
|
| GB/T 7991.6-2014 | English | 149 |
Add to Cart
|
2 days [Need to translate]
|
Test method of viterous and porcelain enamels -- Part 6: High voltage test
| Valid |
GB/T 7991.6-2014
|
Basic data | Standard ID | GB/T 7991.6-2025 (GB/T7991.6-2025) | | Description (Translated English) | Test method of viterous and porcelain enamels - Part 6: High voltage test | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 7991.6-2014 | GB/T 7991.6-2014: Test method of viterous and porcelain enamels -- Part 6: High voltage test---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method of viterous and porcelain enamels.Part 6. High voltage test
ICS 71.120; 25.220.50
G94
National Standards of People's Republic of China
Replacing GB/T 7993-2003
Glass-lined layer test method
Part 6. High voltage test
Part 6. Highvoltagetest
Issued on. 2014-12-05
2015-07-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 7991 "Test method for glass-lined layer" is divided into 10 parts.
--- Part 1. Alkali corrosion measurement solution;
--- Part 2. Determination of resistance to boiling and acid vapor corrosion;
--- Part 3. thermal shock resistance;
--- Part 4. resistance to mechanical shock;
--- Part 5. electromagnetic method to measure the thickness;
--- Part 6. High voltage test;
--- Part 7. Determination of the average linear thermal expansion coefficient;
--- Part 8. Determination of scratch resistance;
--- Part 9. Determination of tensile strength;
--- Part 10. lead, cadmium contents.
This section GB/T Section 67991 of.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB/T 7993-2003 "high voltage test method under corrosive conditions of glass-lined equipment", and
GB/T 7993-2003 compared to the main technical changes are as follows.
--- The standard name has been modified;
--- On the "weak point" definition has been revised;
--- Cancel the original standard 6.1 "test voltage shall be equal to at least the same (enamel coating) the thickness of the air layer breakdown voltage of three times," the
Claim;
--- Cancel the original standard Note 2 "in the air, the breakdown voltage of 1mm linear distance between the point and the ball was about 1kV";
--- Increase 6.2d) "ambient concentrations of flammable gases should be within safe limits" requirement.
This part is proposed by the China Petroleum and Chemical Industry Association.
The glass-lined equipment in part by the National Standardization Technical Committee (SAC/TC72) centralized.
This section is drafted. Tung Wah Group of Shenyang detection Instrument Factory, Changshu Huamao Chemical Equipment Co., Limited Xi'an Long plastic welding equipment
The company, Zhejiang Yongxing Plastic Co., Ltd., Zhongtian Haoyu Technology Co., Ltd., the chemical industry of non-metallic materials and equipment quality supervision and inspection
center.
The main drafters of this section. Zhang goods, Qin Liming, Ma Jianping, Linen Shun, Zhang Liang, Lin Chun Sang, Zhao Feng.
This part of the standard replaces the previous editions are.
--- GB/T 7993-1987, GB/T 7993-2003.
Glass-lined layer test method
Part 6. High voltage test
1 Scope
GB/T 7991 provisions of this part of the glass-lined storey glass-lined voltage test equipment.
This section applies to the test voltage is not less than 2kV, and the thickness of the glass lining layer is not less than the glass-lined equipment 660μm high voltage
test.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 7991.5 enamel coating Test methods - Part 5. electromagnetic method to measure the thickness
3 Terms and Definitions
The following terms and definitions apply to this document.
Weak point weakspots
High voltage breakdown area glass-lined layer due to the presence of bubbles, inclusions, cracks, etc. are provided.
Principle 4
With a positive electrode of the high voltage generator is applied to the glass-lined layer is not less than a predetermined DC voltage of 2kV. By spark discharge and
Light and (or) high voltage generator acoustic signals emitted simultaneously detected enamel coating defects and weak points.
5 device
5.1 high voltage generator
High voltage generator can be given not less than meet the test requirements of 2kV DC voltage (see 6.1), which allows the DC output error
Pressure ± 5%.
The total resistance of the high voltage generator is sufficiently high, so that the arithmetic mean of the maximum short-circuit current of 2mA ~ 3mA, the spark discharge
During the maximum peak current should be between 10mA ~ 50mA, and the maximum amount for each pulse discharge 25μC.
Negative high voltage generator should be grounded to ensure the positive application of a suitable length of shielded high voltage cable and test electrode is connected.
5.2 test electrode
5.2.1 insulated handles
That is insulated handles having a grounded metal jacket.
|