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Chevron is one of the world's leading integrated energy companies with major operations in the USA and throughout the world. In one of their key refineries in California, a revolution in the methods used to prevent leaks has led to startling results in magnitude and frequency of emissions on site.
Valve Leak chart
The attached chart shows the results of USA Valve Leak Rates for 99 Refineries, 10 Asphalt Plants and 6 Chemical Plants for a total of 115 Plant Inspections between 2005 and 2010. The subject refinery has a 500 ppm EP method 21 limit - any value above this limit constitutes a leak – and measures every connection quarterly. In 2010 based on 320,000 total inspections of Valves for the year, the leak rate was only 0.139%. In the same year the leak rate for all sources was just 0.159%, astonishingly based on 1,321,000 total inspections for the year.
The key to this success is the pioneering work of David Reeves, senior specialist for bolting and sealing technology for Chevron worldwide. Over the past 15 years, David has collected and analyzed thousands of hours of data from valves, heat exchangers and pipe flanges and used the results to define a set of material specifications and assembly processes that have revolutionized the industry. In many cases the recommendations ran counter to prevailing wisdom at the time, but have since become industry standard and set the benchmark for other facilities.
A pdf of the presentation outlining the revolutionary methodology of David’s approach can be downloaded here >
For details on how the Chevron methodology can assist your site please contact Dr Gavin Smith: gavinsmith@ldarenvolve.com
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Chevron's Revolution in Emission Reduction!
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