By A. Attari, D.L. Klass
Papers offered on the First and moment IGT Symposium, Chicago, IL, united states, 26-28 August 1985 and 30 April-2 could 1986.
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Extra resources for Natural Gas Energy Measurement
This condition holds true at low pressure but has some deviation at higher pressures. This can be shown by the following example. Basic Data 1. Gas Volume=1,000,000 cu ft=1 MMSCF 2. Dew Point=55°F 3. 0#/MMCF. 0181 cu ft. 2% difference. As we all know, temperature changes occur all along in a pipe line for various reasons. If a gas is not allowed to drop below the dew point temperature, no fall out will occur, but if it drops below the dew point, water will condense. For this reason pipelines should have a minimum temperature that they can operate at.
The program’s goal is to make available several types of calibration standards to the gas industry by the end of 1985. These include a GC calibration mixture with direct NBS traceable certification of composition and similarly traceable calorimetric calibration standards with heating values in range of 800 to over 1200 Btu/SCF. A GC calibration gas will be most useful if its composition approximates that of the test sample, as closely as possible. The survey referred to above gave respondents the opportunity to express their wishes regarding composition of a GC calibration standard.
We normally use a balance with a capacity of 10 kg and a sensitivity of 1–2 mg at that load. When preparing a mixture the weight of the minor component will be small compared to the weight of the container and the error resulting from buoyancy effects and/or exterior surface absorption of moisture may be considerable. Thus the weighing process must be designed to minimize these effects. A tare of almost identical volume and surface is used against which the cylinder containing the sample must be weighed.