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Flow metering system for LPG

Flow metering system for LPG


Client request referred to a state-of-the-art LPG loading facility, with intention to replace metering systems based on turbine meters and include gaseous component into calculation.

Measurement requirements

Loading and unloading by weight scale is impossible to ensure an accurate batch. By direct NET flow measurement process is more accurate and less time consuming. The request was to design metering systems with class 0,3 for NET loading. In addition to this, main request was the usage of Coriolis mass flow meters. Since the LPG loading process means transfer between two vessels under pressure, it is mandatory to measure liquid phase filling the vessel and vapor phase coming out of the vessel to the tank.

Custom-made solution – Revamping the old facility

Project consists of the following installations:

  • 6 metering system for truck loading,
  • 3 metering systems for rail loading,
  • 2 metering systems for truck and rail unloading.

Metrological consistency was achieved with control valves, permanently controlling differential pressure between liquid phase and LPG vapor pressure.

For flow meters, WIG applied OPTIMASS 7300 T40 CT and T50 CT for liquid, and OPTIMASS 8300k S25 for vapor. Single tube OPTIMASS 7300 CT version is approved for CT applications worldwide and in Serbia too, therefore we have quite a lot of experience with measuring light hydrocarbons. Vapor meter is OPTIMASS 8300k as a twin U shape tube designed for measuring low density and even low flow vapors.


  • Highly accurate net batching,
  • Measuring of LPG liquid phase and LPG return vapor phase,
  • Compact system on single skid,
  • Remote operation, certified according to OIML R-117-1 and MID directive.
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Project Details


Our automation & control solutions range from conceptual design to start-up and commissioning and include control system configuration & integration, safety control systems, remote instrument enclosures (RIEs) & panels enclosure and panels design and traditional automation & control services combined with advanced applications offerings and field construction services

WIG offers an independent approach to vendor selection and application.

Our vendor-independent approach allows us to objectively assist in the selection process of the major controls in order to maximize operating efficiency and productivity. Also, as an engineering company, we have the internal knowledge and resources necessary to offer our clients turnkey solutions, from concept to commissioning and startup. Our extensive project management experience, paired with a structured implementation approach and early involvement in the project, can significantly reduce rework and associated costs later in the project.

WIG is one of the leading providers, in this part of Europe, of automation & control services, including system engineering, specification, integration and implementation.

Experience matters. We have built a reputation for innovation, quality and value through skillfully engineered automation & control systems to the upstream oil & gas as well as, water&wastewater, food and beverages and refining and chemical industries. We deliver projects to customers schedule, managing multiple and diverse technologies, automation, maintenance and business system integration and lifecycle costs.

We in WIG are fully aware that commissioning usually represents a critical stage in the life of a facility. Commissioning process may be considered as a series of vital checks undertaken before actual operation begins. Since the complete commissioning services play an important role in minimizing project risks and achieving performance goals from the very start, our job is to prove the integrity of all systems, identifying and correcting design and construction errors along the way. Our comprehensive approach helps our clients meet a host of challenges; regulatory, safety and environmental compliance; and naturally, operational performance.

We in WIG undertake complete responsibility for commissioning, whether we start in the engineering office, provide expertise in the fabrication yard or mobilize to a remote area.

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Our confidence and wide range of options are the result of support and cooperation we have been cultivating for more than 20 years with our Principals and Partners.

We also promote products and represent our principal's interests with an accent to provide comprehensive customers support in instrumentation selection and application, consulting, distribution of products and systems created by our principals and partners. After that stage, we take care of long term genuine spare parts supply and provision of technical documentation and manuals, software tools for operating and maintenance and many other customer related aspects.


  • HMI Catalog
  • Metering systems
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