Storage Tank Floor Condition Assessment Without Taking Tanks Out of Service

Traditionally, storage tanks are taken out of service to manually perform floor inspections. Now with Diakont’s trusted service and innovative technology, our experienced technicians can safely deploy the Stingray system while tanks remained filled and in-operation. This new capability allows tank owners to understand current tank integrity, so that turnarounds can be planned strategically and effectively. As the energy industry pushes towards greater digitalization, this opens a door to create digital twins for tanks, allowing information to be tracked and analyzed. Diakont takes a modern approach with its tooling, using arrays of non-destructive examination (NDE) sensors housed within an explosion-proof enclosure. Equipped for hazardous environments, the Stingray is Class 1, Division 1 certified to ensure process safety. Based upon Diakont’s award-winning industry experience, our work has been recognized and is trusted by the world’s leading oil and gas companies. By implementing our services, tank owners can eliminate the high cost of tank downtime by conveniently obtaining data. This not only allows operators to prioritize tanks for turnaround but also exceeds API 653 and EEMUA 159 inspection requirements without causing risk to people, property, or the environment.

What sets us apart


Ensuring Safety

Ensuring process and personnel safety are the primary focus for Diakont onstream storage tank floor inspections. Our personnel safety program provides the framework that our field technicians use ensure a safe working environment. Diakont inspection personnel are:

  •       – Basic Plus trained
  •       – RSO trained
  •       – OSHA 10/30 certified
  •       – rained in first aid/CPR/AED
  •       – Equipped with proper PPE
  •      – Empowered with stop-work authority



High-resolution NDE

Diakont tank robotic inspection tools are equipped with a patented suite of NDE sensors to assess storage tank floor integrity. The modern SLAM navigation is unmatched to conventional out-of-service practices, since it continually records robot positioning while building a map fused with encoded NDE data. When floor or suspended sediment prevents cameras from receiving clear images, the 3D sonar imaging is used for navigational and obstacle avoidance purposes. Our comprehensive MFL+UT NDE package uses complementary inspection methodologies running simultaneously across the entire tank floor:

  •       – Magnetic Flux Leakage (MFL) is a robust sensor that detects anomalies in almost any surface condition. It is
  •          equipped with an array of hall effect sensors.
  •       – Ultrasonic Testing (UT) measures the absolute floor thickness in high resolution, and assesses size and depth of
  •          any indications for characterization and measurement purposes. It uses an array of 96 sensors to provide 100%
  •          overlapping inspection coverage. In addition to measuring floor plate thickness, the UT sensors can be used to
  •          measure coating thickness.

Diakont performs a complete UT scan around the perimeter of the tank floor in the critical zone.

To meet code requirements, the Diakont tank inspection tooling measures and maps any out-of-plane settlement throughout the tank floor.

Environmental Stewardship

Diakont technicians and services take serious precautions during the tool launch and retrieval process to ensure effective environmental protection. To prevent VOC vapor release, the manway hatch is only opened for a very short period during launch and retrieval, while the fill valve is blocked, to keep any vapor emissions to an absolute minimum. Careful practices are also employed to contain any liquid drips during retrieval.