What are the acceptable standards for vinyl chloride analysis during work in confined spaces?
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This post was last edited by wfchhxx on 2016-9-28 at 10:24. 1) According to Section 6.2 of GB30871-2014, toxic gases in confined space operations must comply with GBZ2.1-2007; the PC-TWA for vinyl chloride is 10 mg/m3, with a tolerance factor of 2, and its short-term exposure limit should not exceed 20 mg/m3. 2) According to 7.3.1.1 of GB14544-2008, before entering the reactor, the volume fraction of vinyl chloride inside the reactor shall not exceed 0.2%, which is approximately 5200 mg/m3. 3) Both of the clauses cited above are mandatory provisions of this standard. 4) Most enterprises adhere to the 30mg/m3 standard specified in GB14544-1993. What are everyone's opinions?
We follow the provisions of Section 6.2 of GB30871-2014: for work in confined spaces, toxic gases must comply with GBZ2.1-2007. The PC-TWA for vinyl chloride is 10 mg/m3, with a tolerance factor of 2; therefore, its short-term exposure limit should not exceed 20 mg/m3.
We are a safety assessment technology intermediary service provider that conducts hazard inspections; some companies adhere to the provisions of Article 7.3.1.1 of GB14544-2008 and refuse to comply.
Article 6.2 of GB30871-2014 stipulates that for toxic gases in confined space operations, the standards set out in GBZ2.1-2007 shall apply; the PC-TWA for vinyl chloride is 10 mg/m3, with a tolerance factor of 2, and its short-term exposure limit shall not exceed 20 mg/m3.
Our company follows a standard of 10mg/m3
The company clung to the provisions of 7.3.1.1 in GB14544-2008 and refused to comply. What do you mean, not execute much?
Given the current situation regarding safety and environmental protection, enterprises should comply with Article 6.2 of GB30871-2014; for work in confined spaces, toxic gases must meet the standards specified in GBZ2.1-2007. The PC-TWA for vinyl chloride is 10 mg/m3, with a tolerance factor of 2, and its short-term exposure limit should not exceed 20 mg/m3.
Clause 7.3.1.1 of GB14544-2008 specifies the acceptable criteria for vinyl chloride analysis during tank cleaning operations; this is in conflict with GBZ2.1, as well as with the gas analysis standards specified in GB30874 for work in confined spaces
Clause 7.3.1.1 of GB14544-2008 specifies the acceptance criteria for vinyl chloride analysis during tank cleaning operations; this is not contradictory to the gas analysis requirements for confined space operations outlined in GB30874, which in turn are in line with GBZ2.1. Tank cleaning can be carried out either mechanically or manually. When mechanically cleaning the tank, the requirements specified in 7.3.1.1 of GB14544-2008 should be followed regarding the acceptable levels of vinyl chloride during such cleaning operations; that is, the vinyl chloride concentration must be less than 0.2%. When entering the tank for cleaning, the gas analysis standards for working in confined spaces as outlined in GB30874 must be complied with, as well as the standards set out in GBZ2.1, which require that the vinyl chloride concentration remain below 20 ppm.
Can cleaning the pot also be done automatically? Haven’t seen it
To clean the tank, a high-pressure cleaning gun can be used to reach inside the tank; there is no need for a person to enter. The high-pressure cleaning gun can be a separate nozzle that the person holds and directs at the inside of the tank for cleaning, or it can be a nozzle on an automatic or semi-automatic cleaning machine. There are plasticizers inside the tank; if people need to enter it or for some other reason must go in, then more thorough aeration and gas replacement is required, which is more or less what was mentioned above! !