|
US$114.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 4797.2-2017: Classification of environmental conditions -- Environmental conditions appearing in nature -- Air pressure
Status: Valid GB/T 4797.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4797.2-2017 | English | 114 |
Add to Cart
|
3 days [Need to translate]
|
Classification of environmental conditions -- Environmental conditions appearing in nature -- Air pressure
| Valid |
GB/T 4797.2-2017
|
| GB/T 4797.2-2005 | English | 239 |
Add to Cart
|
3 days [Need to translate]
|
Environmental conditions for electric and electronic products appearing in nature -- Part 2: Altitude and air pressure, deepness and water pressure
| Obsolete |
GB/T 4797.2-2005
|
| GB/T 4797.2-1986 | English | 199 |
Add to Cart
|
2 days [Need to translate]
|
Environmental conditions for electric and electronic products appearing in nature--Altitude and air pressure, deepness and water pressure
| Obsolete |
GB/T 4797.2-1986
|
PDF similar to GB/T 4797.2-2017
Basic data | Standard ID | GB/T 4797.2-2017 (GB/T4797.2-2017) | | Description (Translated English) | Classification of environmental conditions -- Environmental conditions appearing in nature -- Air pressure | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K04 | | Classification of International Standard | 19.040 | | Word Count Estimation | 6,683 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | 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 | GB/T 4797.2-2017: Classification of environmental conditions -- Environmental conditions appearing in nature -- Air pressure
---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.
Classification of environmental conditions - Environmental conditions appearing in nature - Air pressure
ICS 19.040
K04
National Standards of People's Republic of China
Replacing GB/T 4797.2-2005
Environmental conditions Classification Natural conditions Barometric pressure
Classification of environmentalconditions-Environmentalconditionsappearing
(IEC 60721-2-3..2013, Classification of environmentalconditions-
Part 2-3. Environmentalconditionsappearinginnature-Airpressure, IDT)
2017-12-29 Posted
2018-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Directory
Preface Ⅰ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 the impact of pressure 1
4.1 Overview 1
4.2 below the standard atmospheric pressure
4.3 above the standard atmospheric pressure
5 pressure value 2
Reference 3
Table 1 Altitude and standard pressure between the corresponding relationship 2
Foreword
GB/T 4797 includes the following eight sections.
--- GB/T 4797.1 Environmental conditions Classification of natural conditions Temperature and humidity;
--- GB/T 4797.2 Environmental conditions Classification Natural conditions Air pressure;
--- GB/T 4797.3 Electrotechnical products natural environment conditions of biological;
--- GB/T 4797.4 Classification of environmental conditions Natural environmental conditions Solar radiation and temperature;
--- GB/T 4797.5 Environmental conditions Classification Natural environmental conditions Precipitation and wind;
--- GB/T 4797.6 Classification of environmental conditions Natural environmental conditions Dust, sand, salt spray;
--- GB/T 4797.7 Classification of environmental conditions for electrical and electronic products Natural environmental conditions Seismic vibration and shock;
--- GB/T 4797.8 Electrotechnical products Environmental conditions Classification Natural environmental conditions Fire exposure.
This section GB/T 4797 Part 2.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB/T 4797.2-2005 "Electrical and Electronic Products Part 2. Natural conditions - Elevation and pressure, water depth and pressure."
This section compared with GB/T 4797.2-2005 main changes are as follows.
--- The name of this section changed to "environmental conditions classification of natural conditions atmospheric pressure";
--- The original standard Chapter 3, Chapter 5, 5.4 suspended paragraphs were added to the title;
--- Modify the simplified headings and descriptions of "sub-standard atmospheres" and "greater than standard atmospheres" (see 4.2 and 4.3);
--- Modify formula (1) ~ formula (4);
--- Modify the height range of Table 1, add the comments in Table 2, delete Table 3, Table 4, Figure 1 ~ Figure 5;
--- Delete Appendix NA.
This section uses the translation method is equivalent to using IEC 60721-2-3..2013 "Environmental Conditions Classification Part 2-3. Natural environmental conditions
Barometric pressure. "
The documents of our country that are in conformity with the corresponding international documents that are normative references in this part are as follows.
--- GB/T 4796-2017 environmental classification - Part 1. Environmental parameters and their severity (IEC 60721-1..2002,
IDT)
This section and IEC 60721-2-3..2013 compared to the main editorial changes made the following.
--- In order to unify with our existing standard series, the title of this section to "environmental conditions classification of natural conditions atmospheric pressure."
This part of the National Electrical and Electronic Environmental and Environmental Test Standardization Technical Committee (SAC/TC8) and focal point.
This section Drafted by. Kunming Electric Institute of Science and Technology, China Electric Apparatus Research Institute Co., Ltd., Kunming, limited detection of high-altitude electrical appliances
the company.
The main drafters of this section. Zhao Lei, Huang Kaiyun, Dong Jun, Jia Lianhua.
This part of the standard replaces the previous editions are.
--- GB/T 4797.2-1986, GB/T 4797.2-2005.
Environmental conditions Classification Natural conditions Barometric pressure
1 Scope
This part of GB/T 4797 gives the atmospheric pressure of different altitudes exist in the natural environment, as the product storage, transportation and use
Select the appropriate level of atmospheric pressure background material.
The values in this section can be used when selecting the severity of barometric parameters for product applications.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
IEC 60721-1 Classification of environmental conditions - Part 1. Environmental parameters and classification (Classificationofenvironmentalcon-
ditions-Part 1. Enviromental parameters and theirseverities)
3 Terms and definitions
no.
4 pressure effects
4.1 Overview
Product pressure severity should be consistent with IEC 60721-1.
Air pressure generally affects the performance of the product in different ways, most notably in both sub-standard and above-standard atmospheres.
4.2 below the standard atmospheric pressure
Above sea level, low air pressure has the following effect on the product.
--- Gas or liquid leak from the sealed container;
--- pressure vessel rupture;
--- The physical and chemical properties of low-density materials change;
--- As the pressure decreases, the discharge voltage of the product, the corona voltage and breakdown voltage between the electrodes decreases, the product will be due to arc or electricity
Halo and failure or operating failure (BaShen law pointed out. In a uniform electric field, for a given electrode shape and material, the air
Breakdown voltage depends on the air pressure and the electrode air gap product);
--- Reduce air convection and conduction cooling efficiency;
--- Expected physical effects of acceleration, such as volatile plasticizers, lubricating oil evaporation.
4.3 above the standard atmospheric pressure
The high pressures present in natural basins and mines can result in large mechanical stresses on the sealed container.
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 4797.2-2017_English be delivered?Answer: Upon your order, we will start to translate GB/T 4797.2-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of GB/T 4797.2-2017_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 4797.2-2017_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 4797.2-2017?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 4797.2-2017 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.
|