ABSTRACT

A classic method of measuring energy delivered is to use an orifice meter run and a circular chart recorder to obtain an integrated value for the flow. This flow measurement is combined with an average calorific value to obtain energy delivered. Three methods for measuring energy delivered from the site are compared. The first method is the classic method using an orifice flow meter with circular charts and an average calorific value over the time period being billed. The second method uses a flow computer to calculate and record both the instantaneous and integrated energy being delivered from the site. The third method uses a new device being developed under a contract with the Gas Research Institute. The flow separator operates so that the ratio of the main flow to the sample flow is independent of the flow rate and the gas composition.