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Open-File Report 02–496
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USGS Coal Desorption Equipment and a Spreadsheet for Analysis of Lost and Total Gas from Canister Desorption Measurements

By Charles E. Barker, Todd A. Dallegge and Arthur C. Clark

This publication supercedes OFR-91-563

We have updated a simple polyvinyl chloride plastic canister design by adding internal headspace temperature measurement, and redesigned it so it is made with mostly off-the-shelf components for ease of construction. Using self-closing quick connects, this basic canister is mated to a zero-head manometer to make a simple coalbed methane desorption system that is easily transported in small aircraft to remote localities. This equipment is used to gather timed measurements of pressure, volume and temperature data that are corrected to standard pressure and temperature (STP) and graphically analyzed using an Excel® based spreadsheet. Used together these elements form an effective, practical canister desorption method.

Version 1.0

Posted August 2003

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