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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 7991.5-2014: Test method of viterous and porcelain enamels -- Part 5: Determination of thickness by electromagnetic method Status: Valid
Basic dataStandard ID: GB/T 7991.5-2014 (GB/T7991.5-2014)Description (Translated English): Test method of viterous and porcelain enamels -- Part 5: Determination of thickness by electromagnetic method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G94 Classification of International Standard: 71.120; 25.220.50 Word Count Estimation: 7,791 Date of Issue: 12/5/2014 Date of Implementation: 7/1/2015 Older Standard (superseded by this standard): GB/T 7991-2003 Regulation (derived from): Announcement of Newly Approved National Standards 2014 No. 27 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This Standard specifies the method for measuring the thickness of the magnetic layer of glass-lined on the substrate. This section applies to the measurement of the magnetic substrate glass-lined equipment glass lining layer thickness. GB/T 7991.5-2014: Test method of viterous and porcelain enamels -- Part 5: Determination of thickness by electromagnetic method---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 5.. Determination of thickness by electromagnetic method ICS 71.120; 25.220.50 G94 National Standards of People's Republic of China Replacing GB/T 7991-2003 Glass-lined layer test method Part 5. measuring the thickness of the electromagnetic method Part 5. Determinationofthicknessbyelectromagneticmethod 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 ForewordGB/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 57991 Part of. This section drafted in accordance with GB/T 1.1-2009 given rules. This Part replaces GB/T 7991-2003 "enamel coating thickness measurement of electromagnetic Law", compared with the GB/T 7991-2003, the main technical Surgery changes are as follows. --- Cancellation impact on measurement accuracy of the contents of the original standard glass-lined layer thickness about 3.1; --- Increasing the calibration matrix metal should simulate the firing process after heat treatment requirements; --- Increase for surface corrosion of the metal substrate can not be used for calibration. 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 drafted. Zhejiang Nyaya Health and Technology Co., Ltd., Shenyang Donghua detection Instrument Factory, Guangzhou special pressure equipment to detect RESEARCH Study Institute, Zhejiang Jingwei Group Environmental Protection Engineering Co., the chemical industry of non-metallic materials and equipment for Quality Supervision and Inspection Center. The main drafters of this section. Huang Yuan Gong, Zhang goods, Limao Dong, Wang Shunhai, Sang Lin Chun, should love, Zhang surgery width, Da Jing. This part of the standard replaces the previous editions are. --- GB/T 7991-1987, GB/T 7991-2003. Glass-lined layer test method Part 5. measuring the thickness of the electromagnetic method1 ScopeGB/T 7991 This section specifies the method for measuring the thickness of the magnetic layer of glass-lined on the substrate. This section applies to the measurement of the magnetic substrate layer thickness of glass-lined glass-lined equipment. Principle 2 Electromagnetic measurements through the cover layer and changes in magnetic resistance of the base metal and a thickness of the cover layer.3 Factors affecting the measurement accuracy3.1 Magnetic base metal Affected magnetic gauge base metal magnetic change (change in magnetic low carbon steel may be considered minor), in order to avoid heat treatment Standards and cold factors, application and DUT base metal of the same nature to calibrate the instrument. Preferably by firing simulation Metal matrix heat treatment process before the glass-lined not calibrated. 3.2 the base metal thickness Each instrument is DUT base metals requires a critical thickness beyond this thickness, the measured value will not be base metal The impact of increased thickness. If the instrument manufacturer is not critical thickness values \u200b\u200bof this station apparatus is provided, it shall be determined by experiment. 3.3 Edge Effect DUT mutations will affect the accuracy of the surface shape of the magnetic thickness gauge. So, too close to the number of test DUT at the edges or corners It is not reliable unless the above conditions for the instrument calibration done. This effect may extend to the corners at 15mm. 3.4 Curvature The smaller the radius of curvature of the DUT, the more significant the impact. This has a significant relationship with the type of instrument. With the thickness measurement of a bipolar probe, the probe placed parallel to the cylinder axis or vertical, readings will be different. If unipolar probe Probe irregular wear occurred, it would have a similar phenomenon. Therefore, before the bend specimens measuring instrument to be calibrated specifically for this case. Otherwise, the measurement data is not reliable. 3.5 Surface roughness If the DUT within a rough surface area measured by reference to the same range of values \u200b\u200bsignificantly exceeds the inherent repeatability of the instrument, the At some point the number of measurements should be increased to at least 5 times. 3.6 matrix metal machining direction When the probe with bipolar or unipolar uneven wear probe measuring instrument, instrument readings will be magnetic matrix metal machining (eg ...... |
