GB/T 34710.2-2018Classification of the mixture gas—Part 2: Corrosive classification (English PDF)
混合气体的分类 第2部分：腐蚀性分类
This is a limited preview
Buy now to download the full PDF (15 pages)
Need quotation for your management?
Get a formal quotation for GB/T 34710.2-2018 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
February 6, 2018
Implementation date
September 1, 2018
Scope
GB/T 34710.2-2018 is the English-translated version of 混合气体的分类 第2部分：腐蚀性分类.
GB/T 34710.2-2018 sets out how to classify gas mixtures according to how corrosive they are.
It defines corrosive gases, which destroy or damage living tissues such as the eyes, skin and mucous membranes, and excitant gases, which cause a temporary reaction of those tissues, and uses the symbols C+, C, i and nc for strong corrosive, corrosive, excitant and non-corrosive components.
Each pure component is first assigned its category, with an informative annex listing the categories of some pure gases.
The mixture is then judged by comparing the volume fraction of its components with lower limit values or, when several corrosive components are present, by calculating summed ratios, with worked examples such as ammonia, or hydrogen fluoride, chlorine and phosgene, in nitrogen. It was issued on 6 February 2018 and has applied since 1 September 2018.
Found what you need?
Document preview — GB/T 34710.2-2018
National Standard of the People's Republic of China
- ICS
- 71.040.40
- Classification
- G 86
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Terms and definitions4
- 3 Symbols4
- 4 Corrosive category of pure component gas5
- 5 Corrosive classification and determination of mixture gas5
- Appendix A (Informative) Corrosive categories of some pure gases10
1 Scope
This Part of GB/T 34710 specifies the method for corrosive classification of mixture gas.
This Part applies to the corrosive classification of mixture gas.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1 Corrosive gas
A gas which can destroy or damage living tissues (eyes, skin, and mucous membranes) of the human body.
2.2 Excitant gas
A gas which can cause a temporary reaction of living tissues (eyes, skin, and mucous membranes) of the human body.
3 Symbols
The following symbols apply to this document. C+. Strong corrosive component; C. Corrosive component; i. Excitant component; nc. Non-corrosive component;
LC+. Lower limit value of volume fraction of strong corrosive mixture gas;
LC. Lower limit value of volume fraction of corrosive mixture gas;
Li. Lower limit value of volume fraction of excitant mixture gas.
5 Corrosive classification and determination of mixture gas
b) When a corrosive component is contained, if the volume fraction of the component is greater than or equal to 5 x 10^-2, the category of the mixture gas is corrosive. If the volume fraction of the component is less than 5 x 10^-2 and greater than or equal to 0.5 x 10^-2, the category of the mixture gas is excitant. If the volume fraction of the component is less than 0.5 x 10^-2, the category of the mixture gas is non-excitant.
c) When an excitant component is contained, if the volume fraction of the component is greater than or equal to 5 x 10^-2, the category of the mixture gas is excitant. If the volume fraction of the component is less than 5 x 10^-2, the category of the mixture gas is non-excitant.
5.3.3 Example
a) The corrosive category of the mixture gas having an ammonia content of 6 x 10^-2 (volume fraction) and nitrogen is determined.
b) Refer to Table A.1 of Appendix A; the corrosive category of ammonia is C.
c) The ammonia content in the mixture gas is 6 x 10^-2 (volume fraction). In accordance with column C of Table 1, according to 5.3.2b), the mixture gas is judged to be a corrosive mixture gas.
5.4 Corrosive determination of mixture gas containing various corrosive components
5.4.1 Strong corrosive determination steps and example
5.4.1.1 First, refer to Table A.1 of Appendix A, to confirm that the mixture gas contains strong corrosive component gases.
5.4.1.2 According to formula (1), calculate xC+ Where. phiC+ - Volume fraction of each strong corrosive component;
5.4.2.4 Example
a) Determine the corrosive category of the mixture gas having a hydrogen fluoride content of 0.1 x 10^-2 (volume fraction), a chlorine gas content of 0.1 x 10^-2 (volume fraction), a phosgene content of 2 x 10^-2 (volume fraction), a hydrogen cyanide content of 3 x 10^-2 (volume fraction), and nitrogen.
b) Refer to Table A.1 of Appendix A; the corrosive category of hydrogen fluoride is C+; the corrosive category of chlorine gas is C+; and the corrosive category of phosgene is C.
c) According to formula (1), calculate the value xC+.
d) Since xC+ is less than 1, according to formula (2), calculate the value xC
e) Since xC is greater than 1, according to 5.4.2.3, the mixture gas is judged to be a corrosive mixture gas.
5.4.3 Excitant determination steps and example
5.4.3.1 First, refer to Table A.1 of Appendix A, to confirm that the mixture gas contains strong corrosive, corrosive, excitant, and other component gases.
5.4.3.2 According to formula (3), calculate the value xCi. Where. phii - Volume fraction of each excitant component;
Li1 - The lower limit value of volume fraction of strong corrosive mixture gas. In accordance with Table 1, Li1=0.02 x 10^-2 (volume fraction); […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
How to Download GB/T 34710.2-2018
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 34710.1-2017 — Classification of the mixture gas - Part 1:Toxic classification
GB/T 34710.3-2018 — Classification of the mixture gas—Part 3: Flammable classification
GB/T 7251.4-2026 — Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
Secure payment via Stripe
Payments accepted
GB/T 34710.2-2018
$115.00