It has therefore become the standard program for calculating natural gas properties. The program is based on complex, high-precision calculation methods and complies with international standards. But if someone needs to lower the water dew point of natural gas, we’re the company to speak with.GasCalc is a software tool for easy and prompt calculation of all key properties of natural gases, LNG, biogases or hydrogen. Some liquids will drop out in the dryer, desiccant bed and filter, but we cannot predict how much it will be. In summary, we do not have equipment for reducing the hydrocarbon content or hydrocarbon dew point of gas, at least not in a predictable or systematic way. We always need to verify what kind of dew point we’re discussing. Our dryers do not change hydrocarbon dew point. I often get the question: “By how much do your deliquescent dryers and filters reduce dew point?” The answer of course depends on what kind of dew point we’re talking about. This can be especially confusing when the phrase dew point is thrown around. high BTU gas) does not result in “dry” gas (i.e. However, applying one of our dryers to “wet” gas (i.e. This is where we as a dryer manufacturer often get pulled into the conversation. But the phrase “wet gas” when it’s used this way also invites confusion, because the word wet is usually associated with water. You’ll sometimes hear high BTU gas referred to as “wet gas.” Technically this is appropriate, as high BTU gas is prone to condensation. Therefore, it is important to know what is there and possibly how to change it. Sometimes it’s worthwhile to capture sell these hydrocarbon liquids, if there’s enough. Besides, I long ago forgot what little I knew about them. I will not bring out phase diagrams or anything like that. Hydrocarbons above a certain molecular weight behave like any liquid, in that they go back and forth between liquid and vapor, depending on pressures and temperatures. That’s why folks in the gas industry care about hydrocarbon dew point. Higher BTU gas increases the likelihood of liquids showing up in unwanted places. Theoretically this makes it more valuable. As more hydrocarbons are present – for example butane, propane, ethane, etc – the heating, or BTU, value of the gas goes up. One determinant of natural gas quality is how much hydrocarbon is present over and above methane. This is much different than in a compressed air system, where for practical purposes water is the only condensable. It’s important to realize that untreated natural gas is a mixture of many different gases. The hydrocarbon dew point is a function of the gas composition as well as the pressure. The maximum temperature at which such condensation takes place is called the cricondentherm. It is often also referred to as the HDP or the HCDP. The hydrocarbon dew point is the temperature (at a given pressure) at which the hydrocarbon components of any hydrocarbon-rich gas mixture, such as natural gas, will start to condense out of the gaseous phase. In the gas industry dew point often refers to hydrocarbon dew point.Īccording to the source of all truth, Wikipedia: However in the natural gas industry, at least in North America, water content is stated in terms of pounds of moisture per million standard cubic feet (MMSCF). In the compressed air industry dew point is always a measurement of water content. For those of us who came up in the compressed air industry, transitioning to work in the natural gas industry presents some challenges of terminology.
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