The new CNGmass Coriolis flowmeter series from Endress+Hauser is approved by the National Type Evaluation Program (NTEP) in the U.S. and five other international standards organizations for custody transfer of compressed natural gas (CNG) and for fueling vehicles with CNG. Available in three common sizes from 3/8 inch to 1 inch, the CNGmass measures mass flow up to 330 pound/min (150 kg/min) at fluid temperatures up to 257F (125C) and pressures to 5,080 psi (350 bar).

The instrument measures direct mass or corrected volume flow with 0.5% accuracy to meet custody standards. It also outputs temperature and density. Because the Coriolis flowmeter is a balanced two-tube design, it is insensitive to pipeline vibrations and can be installed without taking inlet or outlet runs into consideration. When used for custody transfer, the flowmeter is verified on site using reference measurements approved by the local authority for legal metrology controls. The flowmeter must be locked for custody transfer measurements and sealed by authorized personnel, but it can easily be converted back to normal measurements. (