I have read that there is an internal examination every 5 years for the portable units Can you send me your thoughts on this? Thanks
The five-year internal examination, per Table 184.108.40.206 of NFPA 10 (2013), is performed as part of the hydrostatic test, which is also required every five years, per Table 8.3.1. I suspect that the interval was originally based on the requirements of the US Department of Transportation for pressure vessels transported over roads, but it was established so long ago that I don't have any record of the original substantiation.
Thank you Barry.
Some one told me to go to the OSHA website to look for the data sheet of the CO2. A customer is asking if CO2 is always efective . (Portable containers or fixed systems).
Depends on what they want to use it for
and where the hazard is located in or outside
Carbon dioxide is a stable substance, so the gas itself does not degrade or expire. It will continue to be effective for a very long time. The 5-year inspection/hydrostatic test is only necessary to verify that the cylinder has not become corroded or damaged to the point that it is unsafe to remain pressurized.
Carbon dioxide stored in cylinders does not need to be reclaimed when the cylinder is emptied; it can be released into the atmosphere. Its release is not a concern for global warming because the gas already exists as CO2. The issue with global warming stems from the creation of new CO2 by chemically decomposing (e.g., burning) other molecules, such as fossil fuels.
Thank you Barry for your feedback. I apprecia it.
If you have any kind of research links to NFPA code/standard development history, please let me know.
Time after time I come across portable fire extinguisher selection / placement requirements that list ratings, listings, and quantity that go way back to somewhere in history. Examples, 18# the only size available for the hazard; 2-A:20-B:C the early ABC dry chemical 10# had that rating.
All (or most) of the revision history for NFPA codes and standards can be found on NFPA's website now. Each document has a Document Information Page, which can be accessed at www.nfpa.org/[docnum] (e.g., www.nfpa.org/10). From there, click on the 'Current and Prior Editions' tab, then select the edition year from the pull down box. There will be a link to "Read the archived revision information." A pop-up box will appear with links to the revision documentation.
If you have a specific question about a requirement or its history, start a conversation here or submit the question on the 'Technical Questions' tab of the relevant Document Information Page.
Not sure if they recover CO2 ???
The 5 year is based on USDOT requirements for hydrostatic test.
As a high pressure cylinder the following applies:
The cylinder that has CO2 in it can be transported even if past due for testing but can not be refilled if past due for testing.
As far as any recovery of CO2 for refilling purposes there are quite a few requirements as to the purity of the gas, any moisture content, and the cost of equipment to maintain the original standard of the gas.
To get to the 'Green' discussion of not discharging the gas into the atmosphere in order to examine the cylinder and retest it if it meets the requirements found in , the NFPA 10 Standard would have to be changed to allow the cylinder [package] to remain untested until such time the cylinder has been discharged and then needs retesting if it is past the USDOT requirement of the 5 year retest cyclet before recharging.
One item that we must look for (as a retesting facility) would be, is this cylinder actually a DOT cylinder. In the past we have found Canadian cylinders that have crept across the border. If not careful a retesting facility will test, stamp, and put these back into circulation. This will be a very sizeable fine (DOT) for that retesting facility.
One more issue that I wanted to bring up, is the nature of how CO2 extinguishes a fire. Normal air that we breathe has 21% oxygen and fire requires 16%. CO2 extinguishes a fire by lowering the O2 content below that 16% and works best in confined spaces. CO2 suppression systems typically are designed for flooding of a confined space. CO2 is the original "clean agent" and is a great extinguishing agent, just not in occupied spaces.
In India as per gas Cylinder Rule, Cylinder shall be hydro tested minimum five years interval or at the time of refilling. please check your local code
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