|
US$309.00 ยท In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 7991.1-2021: Test method of viterous and porcelain enamels - Part 1: Determination of resistance to alkaline liquids
Status: Valid GB/T 7991.1: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7991.1-2021 | English | 309 |
Add to Cart
|
4 days [Need to translate]
|
Test method of viterous and porcelain enamels - Part 1: Determination of resistance to alkaline liquids
| Valid |
GB/T 7991.1-2021
|
| GB/T 7991-2003 | English | 279 |
Add to Cart
|
3 days [Need to translate]
|
Measurement of vitreous and porcelain enamel coating thickness -- Magnetic method
| Obsolete |
GB/T 7991-2003
|
| GB/T 7991-1987 | English | 199 |
Add to Cart
|
2 days [Need to translate]
|
Method for measuring the thickness of glass-lined layer by electro-magnetic meter
| Obsolete |
GB/T 7991-1987
|
PDF similar to GB/T 7991.1-2021
Basic data | Standard ID | GB/T 7991.1-2021 (GB/T7991.1-2021) | | Description (Translated English) | Test method of viterous and porcelain enamels - Part 1: Determination of resistance to alkaline liquids | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G94 | | Word Count Estimation | 16,179 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 7991.1-2021: Test method of viterous and porcelain enamels - Part 1: Determination of resistance to alkaline liquids
---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 1: Determination of resistance to alkaline liquids
ICS 71:120; 25:220:50
CCSG94
National Standards of People's Republic of China
Replacing GB/T 7988-2013
Glass-lined layer test method
Part 1: Determination of corrosion resistance to alkaline solutions
(ISO 28706-4:2016, Vitreous and porcelainenamels-Determination of
2021-12-31 Released 2022-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents"
drafted:
This document is part 1 of GB/T 7991 "Test methods for glass-lined layers": GB/T 7991 has released the following parts:
--- Part 1: Determination of corrosion resistance to alkaline solutions;
--- Part 3: Determination of resistance to sudden changes in temperature;
--- Part 4: Determination of mechanical shock resistance;
--- Part 5: Thickness measurement by electromagnetic method;
--- Part 6: High voltage test;
--- Part 7: Determination of the mean coefficient of linear thermal expansion;
--- Part 9: Determination of tensile strength;
--- Part 10: Determination of lead and cadmium dissolution:
This document replaces GB/T 7988-2013 "Determination of Corrosion Resistance of Glass-Lined Glazes to Alkaline Solution", and is in conformity with GB/T 7988-2013
In addition to structural adjustments and editorial changes, the main technical changes are as follows:
a) Changed the technical requirements for test water (see 5:2, 4:2 of GB/T 7988-2013);
b) Added the technical requirement of "rubber layer thickness should not be less than 2mm" for the sample protective cover (see 6:1:4);
c) Changed the technical requirements for constant temperature water baths (see 6:2, 5:2 of GB/T 7988-2013);
d) Deleted "If there are cracks, cracked porcelain, or edge corroded specimens in the two specimens, this phenomenon should be described in the test report:
And the sample should be replaced and re-tested" (see 8:1 of GB/T 7988-2013);
e) The "Calculation formula for the daily corrosion rate of the sample" is deleted (see 8:2 of GB/T 7988-2013);
f) Added "1mol/L hot sodium hydroxide solution corrosion test" (see Chapter 11):
This document is modified to adopt ISO 28706-4:2016 "Determination of chemical resistance of enamels and enamels - Part 4: Testing with cylindrical containers
Determination of Corrosion Resistance to Alkaline Liquids":
A chapter "Terms and Definitions" has been added to this document:
Compared with ISO 28706-4:2016, this document has more structural adjustments: Comparison list of structure number changes between two files
See Appendix A for the table:
The technical differences between this document and ISO 28706-4:2016 and their reasons are as follows:
--- Delete the normative reference document ISO 48 (see 6:1:4);
--- Replaced ISO 3696 with the normative reference document GB/T 6682, and the degree of consistency between the two documents was modified to accommodate
my country's technical conditions to improve operability (see 5:2);
--- Added normative reference document GB/T 678 (see 5:5);
--- Added normative reference document GB/T 629 (see 5:6);
--- Replaced EN10088-1 with the normative reference document GB/T 20878: There is no consistent correspondence between the two documents:
Adapt to my country's technical conditions and improve operability (see 6:1:6);
--- Replaced ISO 1042 with the normative reference document GB/T 12806, the degree of consistency between the two documents is non-equivalent, to suit the
According to the technical conditions of our country, improve the operability (see 6:9);
--- Replaced ISO 28764 with the normative reference document HG/T 3105, there is no consistent correspondence between the two documents, in order to suit the
According to the technical conditions of our country, improve the operability (see 7:1);
--- Increase the rejection of unqualified samples: Provisions for the removal of quality defects present on the test specimen (see 8:1, 8:2), for the purpose of
Improve the accuracy of the test results, try to avoid the quality defect of the sample during the test process after being corroded by the alkali solution to the test results:
effect;
--- Added "the process of taking the sample out of the desiccator to the end of weighing the sample, the time is not more than 2min" (see 8:9),
In order to avoid the weight gain of the sample by absorbing moisture in the air as much as possible, and improve the accuracy of weighing;
--- Change the heating time of the test device without the test solution in the constant temperature water bath from 10min to 15min (see 8:6),
The purpose is to ensure that the temperature of the test device is consistent with the temperature of the water in the constant temperature water bath, and to improve the accuracy of the test results:
The following editorial changes have been made to this document:
--- In order to harmonize with existing standards, the name of the standard was changed to "Test Methods for Glass-Lined Layers - Part 1: Corrosion Resistance to Alkaline Solutions"
Determination of ";
--- Changed the description sequence of protective sleeve, flange plate, plug, and six-wing nut in 6:1 test device;
--- Changed the subscript of the mass symbol m before and after the weighed sample in the formula:
Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed by China Petroleum and Chemical Industry Federation:
This document is under the jurisdiction of the National Standardization Technical Committee for Glass-lined Equipment (SAC/TC72):
This document is drafted by: Jiangsu Yangyang Chemical Equipment Manufacturing Co:, Ltd:, Taicang Xingong Glass-lined Co:, Ltd:, Suzhou Xieli Chemical Engineering Co:, Ltd:
Equipment Co:, Ltd:, Jiangyin Dacheng Chemical Equipment Factory, Tianhua Chemical Machinery and Automation Research and Design Institute Co:, Ltd:
The main drafters of this document: Zhu Hongzhi, Qian Jianfeng, Shen Yongqi, Wei Zhihua, He Zhengwen, Xiao Lijuan, Sang Linchun, Xu Guoping:
This document was first published as GB/T 7988-1987 in 1987, revised for the first time in:2002, and revised for the second time in:2013:
Three revisions:
Introduction
GB/T 7991 aims to accurately measure the performance data of the glass-lined layer, and is intended to consist of 10 parts:
--- Part 1: Determination of corrosion resistance to alkaline solutions;
--- Part 2: Determination of resistance to boiling acid and its vapor corrosion properties;
--- Part 3: Determination of resistance to sudden changes in temperature;
--- Part 4: Determination of mechanical shock resistance;
--- Part 5: Thickness measurement by electromagnetic method;
--- Part 6: High voltage test;
--- Part 7: Determination of the mean coefficient of linear thermal expansion;
--- Part 8: Determination of scratch resistance;
--- Part 9: Determination of tensile strength;
--- Part 10: Determination of lead and cadmium dissolution:
These ten performance parameters are very important to glass-lined equipment, and are directly related to the quality and service life of glass-lined equipment:
This document improves the technical level of the test method and the accuracy of the test results, and can more accurately measure the alkali corrosion resistance of the glass-lined layer
To optimize the formulation of glass-lined glaze, evaluate the rationality and advancement of the firing process of glass-lined equipment, and improve the quality of glass-lined equipment
and service life are very important: In addition, this document is modified using ISO 28706-4:2016 "Enamel and enamel resistance to chemical corrosion"
Determination of Properties Part 4: Determination of Corrosion Resistance to Alkaline Liquids by Cylindrical Containers, in line with international standards, and thus in accordance with this document
When the results of the test are compared with the test results of international standards, the test results are comparable, which can better promote trade, exchanges and
Technical cooperation:
Glass-lined layer test method
Part 1: Determination of corrosion resistance to alkaline solutions
1 Scope
This document describes the test principle for the determination of the corrosion resistance of the glass-lined layer of the glass-lined flat plate specimen, and specifies the reagents, test
Device, sample, test procedure, result calculation and test report:
This document is applicable to the determination of the corrosion resistance of glass-lined layers to alkaline solutions:
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document:
GB/T 629 Chemical Reagent Sodium Hydroxide
GB/T 678 Chemical Reagent Ethanol (Dehydrated Ethanol)
GB/T 6682 Analysis Laboratory Water Specifications and Test Methods (GB/T 6682-2008, ISO 3696:1987, MOD)
GB/T 12806 Laboratory glass instrument single-line volumetric flask (GB/T 12806-2011, ISO 1042:1998, NEQ)
GB/T 20878 Stainless steel and heat-resistant steel grades and chemical composition
Preparation of HG/T 3105 Steel Plate Glass-Lined Specimen
3 Terms and Definitions
There are no terms and definitions that need to be defined in this document:
4 Principles
After corroding the glass-lined surface with a certain concentration, a certain temperature and a certain amount of alkaline solution for a certain period of time, the mass loss of the sample was measured, and the
Calculate mass loss and corrosion rate per unit area:
5 Reagents
5:1 Basic requirements
Unless otherwise specified, the test process should use certified analytical reagents:
5:2 Test water
The distilled water used in the test shall be distilled water with the third-grade purity specified in GB/T 6682 or water of the same purity:
5:3 Acetic acid solution
The concentration of acetic acid solution is 50mL/L, which is used to clean the test device and sample:
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 7991.1-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 7991.1-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of GB/T 7991.1-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 7991.1-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay. Question 5: Should I purchase the latest version GB/T 7991.1-2021?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 7991.1-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.
|