This paper is written for the natural gas pipeline industry, from the vantage point of wellhead to burner tip. It’s for: ?? Production Companies wanting to ensure proper measurement of the Btus delivered to, and normally measured at their wellheads by, gathering companies, ?? Gathering and Processing Companies wanting to control losses across their gathering lines and across treatment and processing plants, ?? Transportation Companies wanting to control gas losses across high pressure pipe that extends for thousands of miles, and ?? Distribution Companies that are concerned with gas losses across both high and low pressure distribution systems within city plants. The value proposition to most companies is that a physical loss of gas directly affects their bottom lines as either a loss of revenue or as an expense