Conference Alert: GPA Europe 2013

“We have a firm commitment to NATO, we are a part of NATO. We have a firm commitment to Europe. We are a part of Europe.” -- Dan Quayle (American 44th US Vice President under George Bush (1989-93). b.1947)

The Gas Processors Association (GPA) is staging GPA Europe (http://www.gpaeurope.com/) in September.

GPA Europe 2013
30th Anniversary Conference
Edinburgh, United kingdom
18 Sep 2013 - 20 Sep 2013

I don’t yet know who will present papers, or what topics will be addressed.  However, a Google® Scholar search for gpa europe resulted in the following paper from a previous conference …

///////
GPA Europe, Spring Meeting, Dublin, Ireland; May 19-21, 2004 1
An examination of the prediction of hydrate formation conditions in sour natural gas
John J. Carroll
Gas Liquids Engineering, Ltd., #300, 2749 - 39 Avenue NE, Calgary, Alberta, CANADA T1Y 4T8
ABSTRACT
It is the purpose of this paper to briefly review the literature for hydrate formation in mixtures containing hydrogen sulfide. Seven methods for predicting hydrate formation for these systems will be examined. For the set of data examined in this study, which is made up of almost 125 experimental points, the computer methods CSMHYD and EQUI-PHASE Hydrate are reasonably accurate. The average errors for both CSMHYD and EQUI-PHASE Hydrate are about 1.5 Fahrenheit degrees (0.8 Celsius degrees). Typically these methods are able to predict the hydrate temperature to within 3 Fahrenheit degrees (1.7 Celsius degrees) 90% of the time.
The hydrate prediction routine in Hysys, a general-purpose process simulator, was also quite accurate with an average error of 1.5 Fahrenheit degrees (0.8 Celsius degrees). Hysys is able to predict the hydrate temperature to within 3 Fahrenheit degrees (1.7 Celsius degrees) more than 90% of the time. On the other hand, Prosim, another general-purpose simulator program, was not as accurate. The average error for Prosim was about 2.3 Fahrenheit degrees (1.3 Celsius degrees). It was able to predict the hydrate temperature to within 3 Fahrenheit degrees (1.7 Celsius degrees) only about 65% of the time The Baillie-Wichert method was specifically designed to handle mixtures containing hydrogen sulfide and is particularly useful for hand calculations. When used within its stated ranges of composition, this method has an average error of 2.0 Fahrenheit degrees (1.1 Celsius degrees). This method predicts the experimental hydrate temperature to within 3 Fahrenheit degrees about 80% of the time. Finally, the simple K-factor method, also designed for hand calculations, had an average error of 2.7 Fahrenheit degrees (1.5 Celsius degrees). The method predicted the experimental hydrate temperature to within 3 Fahrenheit degrees 60% of the time. The modified K-factor method of Mann et al. (1989) was as accurate as the more rigorous computer models. The average errors for the method of Mann et al. (1989) was 1.5 Fahrenheit degrees (0.8 Celsius degrees) and it predicted the hydrate temperature to within 3 Fahrenheit degrees (1.7 Celsius degrees) about 90% of the time.
While the averages noted above give an overall impression of the accuracy of these methods, the maximum errors reveal the potential for significantly larger errors. Even the computer methods have larger maximum errors, 6.0 Fahrenheit degrees (3.3 Celsius degrees) for EQUI-PHASE Hydrate, 7.4 Fahrenheit degrees (4.1 Celsius degrees) for CSMHYD., and 6.0 Fahrenheit degrees (3.3 Celsius degrees) for Hysys, and 8.0 Fahrenheit degrees (4.4 Celsius degrees) for Prosim. The Baillie-Wichert chart has a maximum error of similar magnitude, 5.8 Fahrenheit degrees (3.2 Celsius degrees). The K-factor has a maximum error of 10.0 Fahrenheit degrees (5.6 Celsius degrees) and for the modified K-factor method of Mann et al. (1989) this was improved to 7.0 Fahrenheit degrees (3.9 Celsius degrees)
Free full text source: http://gasliquids.com/papers/gpa_dublin_2004.pdf
///////