Flow volume control of natural gas storage

Application Report | Oil & Gas

  • Optimisation of gas transport from onshore to offshore platform
  • Maintenance free measurement solution with excellent long term stability
  • Accurate alternative to mechanical gas flow meters


With the demand for gas growing, the storage capabilities for gas are increasingly playing a vital role to keep a nation’s gas supply secure and flexible. In this respect the Castor Underground Gas Storage (UGS) project has been one of the most important investments in the Spanish gas network in recent years. In the city of Vinarós an onshore plant for the treatment and conduction of natural gas ensures that the gas can be effectively transported and finally stored in an depleted offshore oil field.

Measurement requirements

The storage terminal operator Escal UGS was looking for a cost effective measurement solution to control the flow volume of the natural gas transported from the onshore storage terminal to the offshore platform, i.e the storage pit, and back from the storage to delivery. This required a redundant flowmeter for the delivery of natural gas to the measurement station as well as a site internal flow control of natural gas and a measurement of the natural gas used as fuel for local consumption.

KROHNE Solution

KROHNE delivered 3 units of the OPTISONIC 7300 F. One device was installed in a special configuration as dual universal ultrasonic gas flowmeter with a nominal size of 30”/600 lbs (DN 750) for delivery of gas to the measurement station. The device is capable of measuring a wide flow range of 0…900.000 kg/h. A second flowmeter, 24”/900 lbs (DN 600), was used for flow control in the gas storage process. A third OPTISONIC 7300, 2”/150 lbs (DN 50), was applied for measuring the local consumption of natural gas as fuel gas.

As demanded by the customer, KROHNE delivered the OPTISONIC 7300 F in accordance with special painting procedure specifications.

Customer benefits

In using the OPTISONIC 7300 F the storage terminal operator Escal benefits from an optimised volume control of the natural gas storage. The 2 beam ultrasonic flowmeter offers excellent long term stability and repeatability. No moving parts are used and the device doesn’t need recalibration and maintenance. The OPTISONIC 7300 allows for a wide measurement range. Instead of customising a regular but more expensive CT ultrasonic flowmeter, KROHNE individually designed the solution according to the non-CT requirements which makes it a very economical device for the customer’s natural gas application.

Products used


Ultrasonic flowmeter for natural gas, process gas and utility gas applications

  • 2-path meter, for standard volume flow metering, independent of media properties
  • No maintenance, no pressure loss, large dynamic range
  • Flange: DN50…1000 / 2…40", max. PN450 / ASME Cl 2500; also weld-in connections
  • 3 x 4…20 mA, HART®, Modbus, FF