Tank scraper decisions

Louise Smyth

Half, full or three-quarters bridge scrapers: which to choose?

Should rotating settlement tank scrapers be half, full or three-quarters length? And what is the point of a standardised modular design for rotating settlement tank scrapers when no application is ever standard?

Tanks come in different sizes and this often dictates the format. For small tanks (say around 30m diameter), a half bridge scraper is usually the best option.

Big tanks (up to 50m diameter) usually benefit from a full bridge design. For intermediate sized tanks, three-quarter bridges are often a great option. They can carry extra features and provide optimised stirring for maximum operational effect.

A modular design allows rapid design and build, because parts and sub-systems can be prepared in advance using well-practiced procedures. The size and options can be selected to best suit each application.

What are my options?

The options available on any A&J Fabtech bridge include scum management systems, variable speed drive, bespoke inlet structures, wireless load monitoring, automatic lubrication, loss of motion detection, torque overload protection, and more. Ancillary equipment, such as access ladders, stairs, walkways and handrails can be provided as part of the package.

A&J Fabtech designs its bridge drives to provide the speed and power specified for each installation. This ensures reliability and therefore low maintenance and service requirements. Its three-quarter bridges are usually fitted with adjustable scraper blades, and these can even be reversed to double the working life.

The company’s team of engineers, designers and fitters has many decades of experience in bridge scraper design, construction, delivery, installation and commissioning. As such, the insight and expertise they bring to any project – new build, refurbishment or upgrade – is invaluable.

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