Discussed again the fire protection classification of hydrogen oxide solutions
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This post was last edited by baishi2007 on 2016-1-4 at 10:26. In regulatory standards, Class I oxidizers are classified as Category A, while Class II oxidizers are classified as Category B. So, which standards should be referred to when determining Class I and Class II oxidizers? The building codes state that according to the \"Rules for the Transport of Dangerous Goods\", it applies only to sea and rivers; as for the \"Regulations on the Transport of Dangerous Goods by Road\", it’s not clear whether it is the same set of rules. In GB12268-2012, the List of Names of Dangerous Goods, hydrogen peroxide, stable, or aqueous solutions of hydrogen peroxide, stable, with a hydrogen peroxide content of over 60% is classified as a Category 5.1 oxidizing agent and requires Packaging Group I. Aqueous solutions of hydrogen peroxide with a hydrogen peroxide content of not less than 20% but not more than 60% are also classified as Category 5.1 oxidizing agents and require Packaging Group II. Aqueous solutions of hydrogen peroxide with a hydrogen peroxide content of not less than 8% but less than 20% (with stabilizers added if necessary) are classified as Category 5.1 oxidizing agents and require Packaging Group III. According to GB13690, Classification and Marking of Commonly Used Dangerous Chemicals, hydrogen peroxide solutions with an oxygen peroxide content of 8% ≤ content ≤ 40% are classified as Category 5.1 oxidizing agents. Their hazardous properties include 5.11: highly flammable and explosive when exposed to open flames; 5.115: strong oxidizing property. Hydrogen peroxide solutions with a content of 40% < oxygen peroxide content ≤ 60% are also classified as Category 5.1 oxidizing agents. Hydrogen peroxide solutions with a content of over 60% (with special authorization) have the following hazardous properties: 5.11: highly flammable and explosive when exposed to open flames; 5.53: prone to explosion when in contact with flammable materials or organic substances; 5.57: risk of combustion and explosion due to impact, friction, or vibration; 5.99: corrosive; 5.115: strong oxidizing property; 5.144: slowly decomposes to release oxygen, and the decomposition rate increases upon contact with metals (except aluminum). These two standards differ in their classifications for hydrogen peroxide concentrations – which one should be used? ? Do the Class I oxidizers and Class II oxidizers mentioned in building codes correspond to Class I packaging and Class II packaging in the hazard goods classification list of GB12268-2012? ? But it seems that this statement isn’t accurate either; according to the classification in GB12268, hydrogen peroxide with a concentration of less than 20% is not considered to belong to Category B, which is clearly incorrect. Everyone, please share your opinions. Don’t just rely on personal feelings; when it comes to design, one needs to use standard criteria and reasons to convince others, to persuade experts. These past two days I consulted an experienced expert from a previous pressure pipeline review, and after comprehensive consideration I concluded that when the hydrogen peroxide concentration is ≥8%, it is highly dangerous as it can easily catch fire and explode upon contact with an open flame; due to its strong oxidizing properties, it is classified as Category A
This post was last edited by ckwcba on 2015-12-15 at 22:33. Yes, the ‘Rules for the Transport of Dangerous Goods’ issued in 1971 can be found at http://www.baike.com/wiki/‘Rules for the Transport of Dangerous Goods’. Whether it is the Regulations on the Transport of Dangerous Goods, the Regulations on the Transport of Dangerous Goods by Waterway, the Regulations on the Transport of Dangerous Goods by Road, or other regulations, the definition of dangerous goods remains consistent, with the List of Dangerous Goods Names serving as the criterion for determination. The \"Detailed Rules for the Management of Railway Transport of Dangerous Goods\" are somewhat special, as the \"List of Names of Dangerous Goods for Railway Transport\" serves as the criterion for determining such goods. It doesn’t have much to do with the packaging category; for example, sodium peroxide is a first-class oxidizing agent, but its packaging category is III. The 12th version of the product name list no longer includes CN codes; according to the old 05 version of the list, primary oxidizers are those with CN codes ranging from 51001 to 51500, while those with codes 51501 and higher are secondary oxidizers.
I replied to a post earlier; I’m not sure if you saw it. Please refer to the 2015 edition of the \"WX Chemicals Catalog\" as well as the interpretations provided on the General Administration’s website regarding the catalog of hazardous substances (Document No. An Jian Zong Ting Guan San 80). For hydrogen peroxide with a concentration of 20%-60%, it is classified as an oxidizing liquid, Category 2. What is the concept of oxidizing liquid category 2? OK, GB30000.14-2013 specifies that Category 2 refers to \"substances that can accelerate combustion, oxidizers.\" Based on Article 3.1.1 of the Building Code GB50016-2014, I believe its fire hazard category falls under Class B, which refers to \"oxidizers that are not classified as Class A.\" If you think it works well, a fresh flower would be greatly appreciated. Feel free to exchange ideas if you have any questions. Thank you!
"Primary oxidizers refer to substances with CN numbers from 51001 to 51500; those with numbers 51501 and above are secondary oxidizers. " Where can I find instructions for this? Similar phrases can be found throughout GB12268.
According to this, does that mean liquids with a concentration below 20% are not considered oxidizing liquids? Moreover, in regular designs, hydrogen peroxide is often designed as a Category A substance. I worked on a project some time ago that involved the use of a 10% sodium hypochlorite solution; the review experts said it should be classified as an oxidizer of Category B, rather than Category A, and it wasn’t found in the list of product names either. This leads to the question of how to classify them when the hydrogen peroxide concentration varies. Let’s think differently: how should methanol and ethanol with different concentrations be classified in terms of their fire resistance levels? Of course, the new regulations classify baijiu with an alcohol content of 38 degrees or higher as Category A
. . Take a look in the hazard classification explanation; I remember that the 8-20 hydrogen peroxide solution is an oxidizing liquid, classified as Category 3.
According to the authorities now, it doesn’t matter who says it’s dangerous or not; one has to conduct tests and obtain a report to find out. . For ethanol solutions, refer to item 2828, category 87 in the catalogue; ethanol solutions are considered hazardous substances. However, no specific hazard category has been assigned to them. Item 2828 refers to \"synthetic resins, paints, auxiliary materials, coatings, and other products containing flammable solvents.\" According to the regulations, those with an alcohol content of over 38% are classified as Category A; in my opinion, those with an alcohol content below 38% but with an ethanol volume percentage greater than 24% can be classified as Category B. If the concentration is even lower, it is necessary to obtain a flash point and sustained combustion test report to be convincing. . Typo. .
Can the directory interpretation file be shared? ?
It belongs to Category A; there’s no doubt about it. Examples are provided in the explanatory notes to Article 3.1.1 of the Code for Fire Protection Design of Buildings GB50016-2014. “Category A, Item 5: Substances in use have strong oxidizing properties. Some peroxides contain the peroxide group (—O—O—); they are extremely unstable, readily release oxygen atoms, and possess strong oxidizing properties that cause other substances to oxidize rapidly, generating a large amount of heat and leading to combustion or explosion. Such substances can decompose rapidly in the presence of acids, bases, heat, impact, friction, catalysts, or upon contact with flammable materials or reducing agents, and are highly prone to combustion or explosion; this is the case in the production of substances such as sodium chlorate, potassium chlorate, hydrogen peroxide, and sodium peroxide.
“Category A, Item 5: Substances in use have strong oxidizing properties. Some peroxides contain the peroxide group (—O—O—); they are extremely unstable, readily release oxygen atoms, and possess strong oxidizing properties that cause other substances to oxidize rapidly, generating a large amount of heat and leading to combustion or explosion. Such substances can decompose rapidly in the presence of acids, bases, heat, impact, friction, catalysts, or upon contact with flammable materials or reducing agents, and are highly prone to combustion or explosion; this applies to the production of substances such as sodium chlorate, potassium chlorate, hydrogen peroxide, and sodium peroxide. But with different concentrations, the level of danger certainly varies; hydrogen peroxide, at low concentrations