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Merrett Survey have surveyed numerous underground storage tanks, & our staff have confined space training. It is not always necessary to enter the storage tank as we have been able to lower the instrument through roof hatches, which is safer than needing to access the tank.

Data for both the tank floor or sump and filling volume are recorded in a single operation, & an estimation of tank thickness is not required as the internal cavity is directly measured. Scanning is faster and safer than traditional methods.

If the survey is extended beyond the bund, or to a wider area using airborne lidar, we can examine the route any pollutants may take to a watercourse in the event of an accident.
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This video was produced for a recent storage tank conference and demonstrates how laser scanning can be used to assess whether an internal floating roof design (IFR) for a storage tank will actually fit. The scan data was modelled and used to carry out clash detection for a retrofit roof installation. Laser scanning revealed that the IFR would clash with the tank shell, though the clash could be resolved by raking the stilling wells to ensure smooth IFR travel. We provided a comprehensive analysis of the proximity of the IFR to the tank wall.

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An example of the HDR panoramic imagery that we acquire when carrying out storage tank surveys. This visual information provides a record of areas surveyed and could be used for monitoring or for Q/A of work carried out.

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Contact Merrett Survey Limited for storage tank monitoring surveys.

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Modelling the steel latticework inside some storage tanks. These renders were made in Rhino 3D and show the mesh of the tank wall and the modelled steel elements. The modelled steel is considered as 'deadwood' in the strapping tables that we create from the data.
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2016-05-25
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Surveying storage tanks to measure deformation, in-between all the bad weather we've been having recently. Laser scanning the tanks allows us to measure "out of roundness" and to create strapping tables.
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2016-02-08
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The video shows a laser scan survey of a storage tank with visible shell deformation. We are able to accurately report and monitor the ’out of roundness’ of the storage tank. 

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By ‘unfurling’ the tank shell, we can create difference images and contours to show areas of deformation. Dents are coloured blue and bulges are coloured red. Areas where the there is no deformation are coloured green.

Tank settlement can cause various changes to the shape of the bottom shell and can tilt the tank in certain circumstances. Our strapping tables not only incorporate accurate circumference and height measurements but also all internal ‘deadwood’
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Being able to scan whilst inverted is very useful when scanning confined or unusual spaces such as blast furnaces, silos, storage tanks and caves. 
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COMPLETE DATA CAPTURE: The laser scanner collects thousands of survey points on every surface. We also capture the storage tank surroundings allowing us to look at bund capacity and carry out spill analysis. We can survey inside and outside of storage tanks, as well as above ground and buried tanks.
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2015-11-05
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