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Title: The Stability Of Ppm Moisture Standards In Methane After Exposure To Temperatures Below The Calculated Dew Point
Author: Susan J. Brandon
Source: 2008 Natural Gas Sampling Technology Conference
Year Published: 2008
Abstract: The experiments conducted in Pasadena, TX at Scott Specialty Gases and in Pueblo, Colorado at an independent customer site were designed to determine the percent recovery of Water in Methane calibration standards that had been exposed to temperatures below their calculated dew points. Pending the successful recovery of the standards, additional tests were constructed to determine the stability of the standards over the entire cylinder pressure range, the optimal operating temperatures for the use of the calibration standards and the optimal sampling regulators for the direct measurement of water using a SpectraSensors Moisture analyzer. Six cylinders were gravimetrically prepared at Scott Specialty Gases (SSG) in Pasadena, Texas. Three of the cylinders were manufactured at 10 pounds per million (200 ppmv) and three were manufactured at 7 pounds per million (140 ppmv). The calculated dew point of the 200 ppmv cylinder is 73 degrees F at 2000 psia, and the 140 ppmv is 62.9 degrees F at 2000 psia. The six cylinders were analyzed at SSG using a SpectraSensors Moisture analyzer and a Meeco Waterboy LP2. All six cylinders confirmed their calculated NIST traceable gravimetric values to within +/- 5% using the SpectraSensors analyzer, and within +/- 6% using the Waterboy LP2.

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