This standard specifies the technical requirements, test methods, packaging, marking, storage, and transportation of liquid carbon dioxide for industrial and welding purposes.
This standard is applicable to liquid carbon dioxide produced from lime kiln gas, fermentation gas, and hydrocarbon conversion gas, as well as produced through the recovery of industrial exhaust gas. It is mainly used in departments and fields such as welding, chemical industry, casting, refrigeration, chemical fiber, agriculture, and scientific research.
Molecular formula: CO2.
Relative molecular mass: 44.009 5 (as per the international relative atomic mass in 2007).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 190 Packing symbol of dangerous goods
GB 5099 Seamless steel gas cylinders
GB/T 5832.2 Determination of moisture in gases - Part 2: Dew point method
GB 7144 Colored cylinder mark for gases
GB 14193 Rules for filling of liquefied gas cylinders
GB 15258 General rules for preparation of precautionary label for chemicals
GB/T 16483 Safety data sheet for chemical products - Content and order of sections
Safety supervision regulations for gas cylinders (Edition 2000)
Supervision regulation on safety technology for stationary pressure vessel (Edition 2009)
3 Technical requirements
The technical requirements for industrial liquid carbon dioxide shall meet those specified in Table 1.
Table 1 Technical requirements
Item Indicators
Carbon dioxide contenta
(volume fraction)/10-2 ≥ 99 99.5 99.9
Oil content Tested as accepted according to 4.4. Tested as accepted according to 4.4. Tested as accepted according to 4.4.
Carbon monoxide, hydrogen sulfide, phosphine, and organic reducing substancesb — Tested as accepted according to 4.6. Tested as accepted according to 4.6.
Odor No peculiar smell No peculiar smell No peculiar smell
Moisture dew point/°C ≤ — -60 -65
Free water No — —
a The content of carbon dioxide for welding purpose shall be ≥ 99.5×10-2.
b The carbon dioxide for welding purpose shall be tested for this item; the carbon dioxide for industrial purpose may not require testing for this item.
4 Test methods
4.1 Sampling
Carbon dioxide stored in cylinders shall be subject to inspection by randomly sampling 2% of the product batch, with the sampling quantity not less than 2 cylinders and not more than 5 cylinders. If any indicator of the test results does not meet the technical requirements of this standard, a double quantity of samples shall be randomly taken from the batch for re-inspection. If any indicator still does not meet the technical requirements of this standard, then the batch of products is considered rejected.
The liquid carbon dioxide packaged in large-volume containers shall be inspected for each container. If any indicator does not meet the requirements of this standard, the product shall be considered rejected.
4.2 Determination of moisture
4.2.1 Determination of free water
The determination of free water shall precede the determination of carbon dioxide content and oil content.
Liquid carbon dioxide stored in cylinders shall be determined using the inversion method. After inverting the cylinder containing the sample to be tested for about 10 min, the cylinder valve shall be slightly opened; if no free water flows out, it is considered accepted.
Foreword i 1 Scope 2 Normative references 3 Technical requirements 4 Test methods 5 Packaging, marking, storage, and transportation Annex A (Informative) Schematic diagram of apparatus processing Annex B (Informative) Safety warning
Industrial liquid carbon dioxide
1 Scope
This standard specifies the technical requirements, test methods, packaging, marking, storage, and transportation of liquid carbon dioxide for industrial and welding purposes.
This standard is applicable to liquid carbon dioxide produced from lime kiln gas, fermentation gas, and hydrocarbon conversion gas, as well as produced through the recovery of industrial exhaust gas. It is mainly used in departments and fields such as welding, chemical industry, casting, refrigeration, chemical fiber, agriculture, and scientific research.
Molecular formula: CO2.
Relative molecular mass: 44.009 5 (as per the international relative atomic mass in 2007).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 190 Packing symbol of dangerous goods
GB 5099 Seamless steel gas cylinders
GB/T 5832.2 Determination of moisture in gases - Part 2: Dew point method
GB 7144 Colored cylinder mark for gases
GB 14193 Rules for filling of liquefied gas cylinders
GB 15258 General rules for preparation of precautionary label for chemicals
GB/T 16483 Safety data sheet for chemical products - Content and order of sections
Safety supervision regulations for gas cylinders (Edition 2000)
Supervision regulation on safety technology for stationary pressure vessel (Edition 2009)
3 Technical requirements
The technical requirements for industrial liquid carbon dioxide shall meet those specified in Table 1.
Table 1 Technical requirements
Item Indicators
Carbon dioxide contenta
(volume fraction)/10-2 ≥ 99 99.5 99.9
Oil content Tested as accepted according to 4.4. Tested as accepted according to 4.4. Tested as accepted according to 4.4.
Carbon monoxide, hydrogen sulfide, phosphine, and organic reducing substancesb — Tested as accepted according to 4.6. Tested as accepted according to 4.6.
Odor No peculiar smell No peculiar smell No peculiar smell
Moisture dew point/°C ≤ — -60 -65
Free water No — —
a The content of carbon dioxide for welding purpose shall be ≥ 99.5×10-2.
b The carbon dioxide for welding purpose shall be tested for this item; the carbon dioxide for industrial purpose may not require testing for this item.
4 Test methods
4.1 Sampling
Carbon dioxide stored in cylinders shall be subject to inspection by randomly sampling 2% of the product batch, with the sampling quantity not less than 2 cylinders and not more than 5 cylinders. If any indicator of the test results does not meet the technical requirements of this standard, a double quantity of samples shall be randomly taken from the batch for re-inspection. If any indicator still does not meet the technical requirements of this standard, then the batch of products is considered rejected.
The liquid carbon dioxide packaged in large-volume containers shall be inspected for each container. If any indicator does not meet the requirements of this standard, the product shall be considered rejected.
4.2 Determination of moisture
4.2.1 Determination of free water
The determination of free water shall precede the determination of carbon dioxide content and oil content.
Liquid carbon dioxide stored in cylinders shall be determined using the inversion method. After inverting the cylinder containing the sample to be tested for about 10 min, the cylinder valve shall be slightly opened; if no free water flows out, it is considered accepted.
Contents of GB/T 6052-2011
Foreword i
1 Scope
2 Normative references
3 Technical requirements
4 Test methods
5 Packaging, marking, storage, and transportation
Annex A (Informative) Schematic diagram of apparatus processing
Annex B (Informative) Safety warning
