Landfill Gas Extraction Piping System Sample Clauses

Landfill Gas Extraction Piping System. (CS-1) Description – Pipe2010 : Gas provides an excellent modeling tool for designing and analyzing a landfill gas extraction system. There are several approaches to modeling the extraction system and a simple yet accurate modeling approach is illustrated below in Figure CS1-1. A compressor (fan – blower) at the collection point provides a vacuum on the piping system. The vacuum is usually on the order of a negative 15 – 30 inches of water (around 1 psi or less). This vacuum must be sufficient to provide a vacuum at each collection point sufficient to pull in the required amount of gas. For this example it is assumed that each of the collection nodes will collect 60 SCFM (standard cubic feet/minute) of gas. Thirteen collection nodes are modeled at the end of 4-inch pvc pipes (light). The rest of the collection system is 8-inch pvc (dark). A control valve will be positioned at the well head collection nodes. The piping system and compressor must be sized so a sufficient vacuum is pulled at each of the collection points. The required analysis is easily done by designating the desired inflow at each well head and calculating the vacuum pressure required. If this pressure is sufficient to allow the control valve to be set to a proper setting to set the flow using the available pressure drop then the collection system will work. If this is not the case either larger pipes or a larger compressor will be required. Conversely if the pressure differences are significantly larger than required then smaller pipes or a smaller compressor may be used. Model Data – The Gas System Data screen is shown in Figure CS1-2. For this example methane properties are used. However, landfill gas will not be pure methane so the gas properties for the extracted gas should be used. The Gas model provides a Lookup Properties tool which will give the necessary properties for methane at 86 degrees F. as shown in Figure CS1-2 (specific gravity, viscosity etc). Note the flow units of SCF/min and pressure units of inches of water are used. These units are commonly used for landfill gas extraction studies. Figure CS1-1 Landfill Gas Extraction System Figure CS1-2 System Data for Landfill Gas (methane) Figure CS1-3 Elevation Data for Landfill Gas (methane) Figure XX0-0 Xxxx, Xxxxxxxxx and Junction Data The pipes are all pvc and a roughness of 0.1 millifeet was used as illustrated in Figure CS1-4. Node elevations are noted in Figure CS1-3. Because the analysis is for gas the elevations will hav...
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