Approach: Measure vent gas emission flow rates as a function of condensate flashed to storage tanks due to "pigging" operations.
Expected Results : Tech-transfer video and training presentation.
Key Words : Gas/oil ratio, vent gas emission, flash vapor, pigging operation
Abstract
Enogex, an Oklahoma gas company, has proposed two field site systems for field demonstration purposes. These sites are compressor stations associated with gathering systems for large pipelines. Condensate is collected in stock tanks from both a gas/liquid separator and the interstage coolers on the compressor bank. A dynamic up-start event occurs when condensed liquids are swept out of the pipeline by a "pig" and resulting in surging of the liquids to the stock tanks. This pigging operation can last for up to several hours and occurs as often as weekly. Continuous readout of both liquid levels and gas vent flows would provide a robust demonstration test for the field protocols for measuring vent gas emissions. Safety design and verification is of the utmost importance because the thermal dispersion meter and recorder and the pulse burst radar meter must operate on electrical current on top of the stock tanks under class I, Division 1 conditions.