Where can i find standards for methane and other explosive gases in manholes or their lower explosive levels?
410658
@ http://www.generalmonitors.com/downloads/application_guides/CONFINED_SPACE.PDF#search='standards%20of%20explosive%20gases%20manholes'\n\nor\n\nwww.iowadnr.com/waste/policy/files/gas.pdf
230551
You can buy them off the shelf. hang on one second and I will get you a URL... http://www.nooutage.com/HydroElGen.htm
596713
Chemexper.com is a great place to look this up and you can browse various companies to buy from as well as search by the specs that you need.
772873
http://www.epa.gov/iaq/pubs/sbs.html
725054
http://www.epa.gov/recyclecity/mainmap.htm
543755
try MRTG. www.mrtg.org
1486
Usually the composition f natural gas is as follows:\nComponent   Typical Analysis(mole %)  Range(mole %)\nMethane          94.9                  87.0 - 96.0\nEthane           2.5                   1.8 - 5.1\nPropane          0.2                   0.1 - 1.5 \niso - Butane     0.03                  0.01 - 0.3\nnormal - Butane  0.03                  0.01 - 0.3\niso - Pentane    0.01                  trace - 0.14\nnormal - Pentane 0.01                  trace - 0.04\nHexanes plus     0.01                  trace - 0.06\nNitrogen         1.6                   1.3 - 5.6\nCarbon Dioxide   0.7                   0.1 - 1.0\nOxygen           0.02                  0.01 - 0.1\nHydrogen         trace                 trace - 0.02\n  \nSpecific Gravity 0.585                 0.57 - 0.62\nGHV(MJ/m3), dry* 37.8                  36.0 - 40.2
828797
the natural gas ( mostly methane CH4) is odorless, when they extract it from underground, it have some unwanted particles. they take it to a facility called Gas refinement to purify it. in doing so they also add small amounts of sulfur Di oxide(SO2) to give it some odor so it can be detected and to prevent explosions.\nCO (carbon monoxide) however is produced right where you are( any indoor fire that doesn't burn properly) so there is no chance to add something to it. they are some detectors to detect CO and they are good from personal use, but they are not to sensitive and might give you a false alarm by detecting CO2 (which is in the air that you breath out)
42193
http://www.itt.edu/staff/boyter/links/index.html\n\nLook under chemistry equipment.  There are some chemicals you will not be able to get.  Posting what you are looking for would help.
427350
http://www.grisoft.com/doc/289/lng/us/tpl/tpl01\n\nIs good, and never bothers you
818188
http://www.eia.doe.gov/neic/infosheets/petroleumproducts.htm
690270
www.fishersci.com\nwww.aldrich.com\nwww.setonresourcecenter.com/MSDSs/comply1.htm\nwww.chemexper.com\n\nthere are too many to list
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http://georgiasocietysar.org/gassar_hev_007.htm\nhttp://www.georgiaencyclopedia.org/nge/Article.jsp?id=h-1088\nhttp://ngeorgia.com/revolution/amrev11a.html
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hydrogen sulfide, carbon monoxide, and carbon dioxide.  Plus, you have to be concerned that there might be no oxygen in the air.\n\nEntering a sewer should be left for people trained in doing "confined space" entries.
230380
um i don't know if this site has it, but you might want to try chemguide.co.uk :) it's a pretty good site.
356690
http://www.yahoo.com then search department of environmental affairs, though I don't believe that's a department.  Search for the Environmental Protection Agency.  I believe it's http://www.epa.gov
64823
http://www.hydrocarbons-technology.com/projects/snohvit/snohvit1.html