If the uncertainties in temperature and pressure for Prob. 7.49 are ±1.5?F and ±2 kPa, respectively, what is the uncertainty of the billing if the actual volume flow measurement is exact?
Prob. 7.49
A positive-displacement meter is used to measure the flow of methane (CH4) at 20?F and 0.95 atm. Temperature and pressure transducers are installed that feed an electronic circuit, which then indicates the flow in standard cubic feet per minute (ft3/min) for billing a customer. The meter itself senses actual volume flow. What factor must be multiplied by the actual volume flow to give SCFM?