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Title: H2S Contamination In Natural Gas Distribution Systems
Author: Fred G. Van Orsdol
Source: American Gas Association 2005
Year Published: 2005
Abstract: in the system, can have a variety of detrimental effects on the pipeline itself and on associated equipment such as flow computers, meters, regulation and control systems, overpressure protection equipment, compression facilities and condensate/liquid recovery systems. If the gas containing H2S is delivered to end users, the impact on their systems can be devastating, depending on the concentration of the H2S, and again on the moisture content of the stream. It must also be remembered that throughout the distribution chain, emissions of H2S or its combustion/reaction byproducts, even in low concentrations, may have a detrimental effect on equipment and on the environment. This paper will discuss the potential impacts of H2S in natural gas pipeline and distribution systems and on the methods for determining H2S levels in natural gas streams. Some discussion will be included concerning corrosion inhibitors and process methods for reducing H2S and/or moisture content to good operating levels. Additional discussion will cover some basics for determining H2S levels in natural gas streams. One point to consider in this presentation is that although produced gas often enters a gathering system for a gas processing facility prior to being delivered into a distribution system, it is quite common for produced gas to enter a distribution system almost immediately, with very little processing beforehand. When malfunctions occur at delivery points near the wellhead, the impact can be immediate.

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