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Storm water accumulated on a concave floating roof of an oil storage tank may affect its floatation, making it necessary to immediately drain the water. This is usually done through a flexible pipe, running from the floating roof down the tank, with an outlet above the ground near the bottom of the tank.
Small or large volumes of the product from the tank can penetrate the flexible pipe through pinholes or cracks due to ageing.
The product will then drain through the water drainage system unnoticed.
Product from the tank might run over the floating roof through the roof's seal during overfill and exit through the water drainage pipe unnoticed.
Sometimes the flexible pipe is bent or clogged preventing water from the roof from passing through.
In this case, water remains on the floating roof, and this may disturb its floatation capability.
Detection of Oil Leaks / Spills - A Leakwise ID-223 Oil Sheen Detector should be installed in a settling tank (or in a sump or a separator) collecting the water drainage from the roof. An alarm will be triggered if the ID-223 sensor detects oil or oil on water, indicating that oil is seeping through a fracture in the roof drainage pipe.
Detection of Clogs in Roof Drainage - If air instead of water status is indicated during a rainy day, it means that the flexible roof drainage pipe is bent or clogged, and no water is running through it.
The ID-223 Detection System can be used to control valves, pumps and sump gates, thus storm water from tank's roof can be discharged directly to the sea, river or public drainage system.
Detection Range 0.3 - 20 mm (0.01 - 0.8 in) of hydrocarbon on water or brine
Water Level Variation Depends on sensor sub-model
Water Temperature 0 - 70 degree celsius (32 - 158 degree)
Oil Monitoring Range ID-225/100: 1 – 100 mm (0.04 – 4.0 in); ID-225/200: 1 – 200 mm (0.04 – 8.0 in)
Water Level Variation Minimum: 30 cm (~12 in) above well/tank/sump bottom.
Water Temperature 0 – 70 °C (32 – 158 °F); no freezing