Kongsberg K-Gauge TOP Tank Overfill Protection System
Kongsberg K-Gauge TOP Tank Overfill Protection System
Description
The KONGSBERG radar based Tank Overfill Protection System for gas carriers meets the IMO requirements ‘Cargo Tank Overfill Protections System’.
The system includes radar tank gauges, processing and alarm handling units, and a dedicated operator panel. Integration to K-Gauge level gauging system is included with mimic presentation on the Operator Stations.
All equipment on deck is designed for rugged marine environment and manufactured in AISI 316L stainless steel. Accurate measurement is possible regardless of the tank atmospheric conditions. Flexible hardware and software modules ensure easy adaptation to Liquefied Petroleum Gases (Propane, Butane), Ethylene, Ammonia (NH3), and Liquefied Natural Gas.
Principle of operation
The RTG emits a frequency sweeping microwave signal through a still pipe. The distance is derived from the time delay of the reflected signal.
The still pipe is assembled by one top, middle and bottom section. Total length of the still pipe is typically 10 meter, and the system allows for several adjustable alarm limits in the area of the middle section (6 meter).
The pipes have ventilation holes allowing the vapour pressure inside and outside the pipe to stabilize, thus allowing the liquid to rise or fall unimpeded in the pipe.
Each pipe section is supplied with flanges prepared with reference markers. The liquid level and the markers are measured simultaneously, so the system automatically verifies itself at every measurement. By careful calibration of the pipe sections length before installation, the positions of the markers are recorded and stored in the system. By comparing the liquid echo with the reference marker echo, a continuous autocalibration of the level gauge is done.
AutroCAL®
AutroCAL® is a unique calibration and verification function in the KONGSBERG system. Gas vapor density and mixture of gases influence the propagation speed of the radar signal, thus the accuracy of the measurement.
By using pipe joint reference markers, AutroCAL® continuously compensates for the changes caused by the differences in the propagation speed.
With AutroCAL®, the influence of the gas vapor density and composition is measured and compensated for automatically.
Building blocks
The K-Gauge TOP system consists of the following hardware units:
• Radar Tank Gauge: GLA-310/5TOP (1 ea tank)
• Radar Processing Unit: GLK-300/x (1 ea tank)
• Remote Controller Unit: RCU502
• Relay output unit: RDIOR420
• Operator/Alarm Panel
• Interface to K-Gauge Operator Station
Features
• No moving parts
• Continuous verification - AutroCAL®
• Configurable alarm limits
• Closed level gauge suitable for all tank designs
• Utilize 50 mm still pipe
• Modular design
• Intrinsically safe for use in all zones
- User name Member Level Quantity Specification Purchase Date
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