ABSTRACT
This chapter discusses the basic principles, laws and methods used to calculate heating value and the effects of water vapor on these calculations. Methods discussed include volumetric corrections as well as heating value corrections using the IGT method. Water vapor determination can be done by various methods, but the most widely used methods are visual and electrolytic water analyzers. Both systems are presently being used in the industry. Gas sampling is probably the most important thing that can affect the water determination results. Errors in sampling could be a major contributing factor to either high or low results. Theoretically, the maximum volume fraction and percent of water that a gas can contain is directly proportional to the partial pressure of water at the temperature of the gas water mixture.
