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Optimizing Operations with the DT640: The Tank Inspectors

We were thrilled to speak to Dan and Jo Hulands of The Tank Inspectors to learn more about how they use remotely operated vehicles (ROVs) for their services. With over 30 years of direct water tank construction and liner installation experience, The Tank Inspectors offer a variety of tank inspection and cleaning services complete with comprehensive reports and video footage. Used by clients ranging from fire management agencies to asset management firms to mining companies, the The Tank Inspectors reduce OH&S risks with robotic solutions.

With home bases in Perth, Adelaide, Cairns, Brisbane and Melbourne, the Australian based tank inspectors offer a multitude of services including:

We spoke to the pair more specifically about their ROV tank cleaning and inspection services. Using the DT640 VAC, The Tank Inspectors are able to thoroughly inspect and clean a variety of tanks for their clients.

What is the DT640?

A purpose built ROV, the DT640 is designed to work in tough underwater environments. A unique solution to various inspections and tasks, the DT640 is equipped with a camera specially designed to work in low light conditions to provide high quality feedback.

With lithium ion battery power, the DT640 does not require a topside power source making the vehicle easily portable. The 360 degree turn radius makes the DT640 a highly maneuverable vehicle providing operators with an effective way in which to inspect underwater infrastructure.

The DT640 VAC Crawler is equipped with an 18-inch dual intake vacuum head to provide operators with an effective and convenient way in which to conduct tank cleanings. Available in the standard DT640 VAC package and the DT640 VAC XL package, the DT640 has a solution for you.

There are several factors about the DT640 VAC that allow The Tank Inspectors to excel in their field.

Minimizing Divers

The use of the DT640 allows The Tank Inspectors to avoid using divers for every single inspection. Operations Manager Jo Hulands noted that where the team used to have to put a diver in the water, they can now use the ROV, “pretty much 80% of the tanks that we do we can clean with the vacuum cleaner.”

By using the ROV in lieu of a human diver, The Tank Inspectors not only keep humans safe but save time and money. In addition to OH&S standards regarding people in tanks and limiting the time people can actually be in the tanks, Dan noted that with the ROV “there’s a lot less set up time, divers require a lot of set up.” Furthermore, the divers require scheduling and coordinating where the DT640 can be deployed quickly and conveniently.

In addition to saving time, the use of the DT640 saves the Tank Inspector team significant amounts of money, with Dan and Jo estimating that the ROV is “40% of the cost of using divers.” “In fact,” Jo continued, “many diving companies themselves use the ROV to limit dive time by scoping out jobs with the DTG3 and undertaking cleans with the DT640.”

Dan also observed that, “the divers know about diving - they don’t necessarily know about tanks. All of our operators know about tanks and have been working with tanks for many years.” With the ROV, tank experts can get their eyes underwater to conduct specialized inspections and cleaning.

Furthermore, the ROVs can be sanitized using a chlorine solution, making meeting health standards feasible. With a sanitized vehicle, The Tank Inspectors can safely conduct clean water inspections and cleanings without contaminating the water.


With the DT640, tank cleanings can take place without interrupting service or draining tanks. Interrupting service is incredibly inconvenient and disruptive for an organization, while draining tanks can be costly and time-consuming with services often offline for weeks at a time as a result. “With an ROV, tanks do not need to be drained or taken out of service,” Jo pointed out. Adding to this she mentioned that “minimizing water loss and saving resources is very important.” By avoiding unnecessary tank draining, resources can be preserved as much as possible.

Reliability and Portability

The Tank Inspectors team offers their services across Australia, and as a result they travel extensively. Managing Director Dan Hulands noted that their jobs can be remote, with up to 2000 kilometres of travel for a tank cleaning. Reliability and portability in an ROV is imperative for all jobs, but particularly jobs requiring extensive travel.

The Tank Inspectors have come to rely on the DT640 while they are on the road. “We only take one cleaner, one ROV all of that distance because they just work” said Dan. The durability and toughness of the vehicle makes the DT640 ideal for The Tank Inspectors. Portable in one carrying case, the DT640 allows the team to conveniently travel to remote locations and deploy from anywhere.


Both Dan and Jo spoke about how effective the DT640 is when it comes to tank inspection and cleaning.

“The cleaner has been designed to not disrupt the surface of coatings - liner or painted surface. It’s specially designed to not tear up the cleaner” said Dan.

Dan noted how important it was that ROV allows them to “check out the bottom without stirring up the sludge.” When sludge gets stirred up it is not only difficult to see through the water but also difficult to clean up. Leaving sediment and sludge undisturbed during inspection makes clean up exponentially easier with the VAC later.

Learn more about the services offered by The Tank Inspectors or reach out today!

You can also read more about Deep Trekker vehicles for tank inspection in our ROV Hacks for Tank Inspection or Maintaining Water Quality with Deep Trekker. As always, the Deep Trekker team of experts is here to answer any questions you may have, reach out today!

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