title: Uncertainty and Traceability for the CEESI Iowa Natural Gas Facility.
abstract: This paper analyzes the uncertainty of a secondary flow measurement facility that calibrates a significant fraction of United States and foreign flow meters used for custody transfer of natural gas. The facility, owned by the Colorado Experimental Engineering Station Incorporated (CEESI), is located in Iowa. This facility measures flow with nine turbine meter standards, each of which is traceable to the NIST primary flow standard. The flow capacity of this facility ranges from 0.7 actual m(3)/s to 10.7 actual m(3)/s at nominal pressures of 7174 kPa and at ambient temperatures. Over this flow range the relative expanded flow uncertainty varies from 0.28 % to 0.30 % (depending on flow).
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899-, USA.
authors.forename: Aaron
authors.initials: A
authors.lastname: Johnson
authors.affiliation: Colorado Experimental Engineering Station Incorporated (CEESI), Nunn, CO 00000, USA.
authors.forename: Tom
authors.initials: T
authors.lastname: Kegel
keywords: CEESI Iowa uncertainty analysis; CEESI traceability to NIST; correlation coefficient; critical flow venturi uncertainty; natural gas facility; traceability; turbine meter uncertainty analysis