Fully scalable tank gauging system
16 December 2010
Emerson Process Management’s Raptor tank gauging system makes it easy to install the devices needed today and add or replace units in the future. This flexibility protects users’ investments so that refineries and tank farms can easily become and stay efficient. Additional benefits include lower installation costs, high accuracy and built-in safety features.
Fully scalable tank gauging system
The Raptor system consists of a complete range of tank gauging instrumentation including high performance, non-contact radar level gauges, temperature and pressure transmitters, plus water interface sensors and inventory management software. Tank hubs are used to communicate with the measuring instruments and control room via standard communication protocols. The design is based on open technology and is fully scalable with functionality and scope that can be adapted to any application and performance class.
The system includes safety technologies to help protect plant assets, personnel and the environment. One example is the unique 2-in-1 functionality, with two independent radar gauges in one single enclosure, providing SIL 3 safety for overfill prevention. There are also a number of other dual redundant configurations available to suit individual tank safety requirements.
Raptor reduces installation costs substantially. Raptor’s unique, bus-powered 2-wire Tankbus communication, is based on self-configuring FOUNDATIONTM fieldbus technology, allowing easy start-up and integration of all system units. The tank units are intrinsically safe, which means no expensive cable conduits are required. Communication to the control room can be made using Modbus over most existing cabling, or using other fieldbus standards.
Further installation cost savings can be realised with Emerson’s Smart Wireless functionality, which eliminates the need for long distance signal wiring. This is especially valuable when no suitable cabling is available and it is necessary to cross roads, or when ground conditions make cabling expensive. Wireless communication can also be used as a redundant and independent communication path beside the traditional wired communication.
There are many tank farms with gauging based on older technology − even in fairly recent installations, leading to maintenance problems and low performance. Raptor can emulate gauges from other manufacturers. This means the customers can add Raptor units to their existing system using the same cabling and control room infrastructure.
Raptor is built around a new line of Rosemount 0.5 mm (0.02 in.) precision radar level gauges, and ultra stable temperature transmitters with 3- or 4-wire multiple spot sensors. The result is the highest available precision in net volume calculations for custody transfer and inventory management. Having access to reliable and accurate tank content information in real time is key to high plant efficiency, as the operators can handle even more tanks, fill the tanks higher and better utilise the storage capacity.
Emerson’s Rosemount Tank Gauging is the world market leader in systems for high precision tank gauging used at refineries and bulk liquid storage plants. The systems are applied on all types of storage tanks, both fixed roof and floating roof tanks. The radar gauges use the drip-off antenna concept, proven in 100,000+ installations world-wide. They can be used in virtually any liquid ranging from light products such as liquefied petroleum gas, liquefied natural gas, and gasoline, to heavier products such as crude oils, and asphalt.
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