API MPMS 5.6 pdf download.Section 6—Measurement of Liquid Hydrocarbons by Coriolis Meters 3 Definitions 3.1 accessory equipment: Any additional electronic or mechanical computing, display, or totalization equipment used as part of the metering system. 3.2 base conditions: Defined pressure and temperature conditions used in the custody transfer measurement of fluid volume and other calculations. Base conditions may be defined by...