Mass flow measurement of oil products when loading and offloading tank lorries and ships

Application Report | Oil & Gas

  • Equipping a loading system for tank lorries with Coriolis mass flowmeters
  • Simple integration into existing SCADA, filling control and control system
  • Custody transfer measurement in accordance with MID MI-005 and API 5.5 Level A


SC Klaipedos Nafta is one of the largest oil ports on the Baltic coast in Lithuania. Crude oil and oil products are delivered by ships and freight trains and then loaded for further transport onto tank lorries and ships. Tank ships with a shipping volume of up to 100000 t can dock and the port capacity is 500 rail cars. The storage volume is approx. 400000 m3. A new filling system suitable for custody transfer was necessary in order to increase the capacity for light oil products when loading tank lorries from tank cars.

Measurement requirements

The new loading system for tank lorries had to be suitable for custody transfer and able to generate all financial data. Additional requirements included: simple installation, superior accuracy and smooth integration of the new system into the existing SCADA and filling control and control system. Measurements must be based on the European MID in accordance with MI-005 and API 5.5 Level A.

Product benzene E 95 ( = 95 % ethanol + 5 % benzene ):

  • Density: 741…791 kg/m3
  • Flow rate: 20…100 m3/h
  • Viscosity: 0,45…1,5 mPa•s
  • Operating pressure: 4 bar
  • Operating temperature: -29…+35 °C/84.2…95 °F

KROHNE Solution

For this application KROHNE supplied 5 OPTIMASS 7300 C mass flowmeters and 2 SUMMIT 8800 digital flow computers. It is very easy to install the OPTIMASS measuring devices in the pipelines as there are no installation requirements. Pipeline vibrations have no impact on the highly accurate measurements. The compact designs of the measuring devices make the electrical connection easier. The devices come equipped with density and temperature measurement as standard. The devices can be started up and operated without any special knowledge. The SUMMIT 8800 is a digital flow computer featuring a large, easy-to-read colour display with multi-colour light control and touchscreen operation. The completely redundant Ethernet is suitable for WLAN when using all common protocols. The SUMMIT 8800 can be used for many different types of measurement.

Customer benefits

OPTIMASS mass flowmeters from KROHNE offer many advantages such as excellent long-term stability and repeatability, guaranteeing precise measuring results. The devices work extremely reliably. Because OPTIMASS 7300 C measuring devices can measure the mass flow directly, recalibration becomes unnecessary, even with varying process parameters. There is virtually no additional pressure loss due to the single straight measuring tube design of the mass flowmeters. This means that the required pump output is minimal.

Products used


Flow computer for custody transfer (CT) measurement

  • Cost effective solution due to modular hard- and software design
  • Full colour graphical touch screen for maximum process transparency
  • Easy operator access enabling time efficient maintenance
  • Automatic Performance Monitoring extends recalibration interval


Coriolis mass flowmeter for advanced process and custody transfer (CT) applications

  • High accuracy flow measurement of gases and viscous, aggressive or shear-sensitive liquids
  • OIML R117, MI-005; also certified for hygienic use
  • Flange: DN10…100 / ½…4", max. PN100 / ASME Cl 600; various other connections
  • 3 x 4…20 mA, HART®, Modbus, FF, Profibus-PA/DP