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Sour gas typically refers to natural gas containing very high concentrations of hydrogen sulfide (H2S). Just how much H2S content makes gas sour is up for debate, and debate it they do. Our interest in this issue is the protection of workers who operate near extraction, refinement, or transportation facilities. We all know OSHA can be a bit behind the times, but their basic suggestions about general health and safety with regards to H2S are sound. They say simply that active monitori …

Crews tackling installation or replacement of natural gas mains need to purge the lines with an inert gas to eliminate the combustion hazard. Purge testing before work begins requires a gas detection device that won't be overwhelmed or damaged by the high gas levels found in this type of work. It's also important to realize that many gas detection sensors require oxygen for accurate measurements. Nitrogen is the gas most often employed to displace the natural gas when servicing main lin …