There are approximately 250,000 tank batteries currently in operation in the US exploration and production (E&P) industry. Most of these batteries do not have any type of control system on them to capture the organic vapors generated by breathing losses, working losses and flashing losses. If the pressure drop from the low pressure separator to the stock tank is greater than a few pounds, then the potential for significant emissions due to flashing losses is present.

Due to the perception by the Clinton Administration that global warming is an issue that needs to be addressed by the US industry, the methane emissions from stock tanks will come under increased scrutiny.

This paper discusses a method for determining methane emissions from stock tanks and how controlling these emissions can aid industry in its work with the Environmental Protection Agency on the Natural Gas STAR program.

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