INSPECTIONS TO API 570 AND API 653
NEDA has invested substantially to obtain the necessary knowledge and experience in order to provide quality service to our clients with the latest, up-to-date literature and equipment available. The following services are provided by in house experienced technicians:
NEDA has the capability to perform a complete map of the bottom side of a tank floor.
NEDA has equipment such as the Silverwing Floormapper VS. This equipment utilises the Magnetic Flux Leakage (MFL) technique for determining the bottom side corrosion of a tank floor.
- Reporting is simplified by uploading the mapped information into a programme which displays the condition of the floor in a series of colours. Each colour represents a percentage of material loss. This illustrates a clear ‘picture’ of the floor, allowing NEDA to make an informed and accurate assessment concerning the state of the floor.
Neda can determine the external thickness of a tank shell (in or out of service) by utilizing the Scorpion Scanner.
- Continuous Ultrasonic B-Scanning is the most effective way to evaluate the condition of a tank shell.
- Using magnetic wheels the Scorpion is able to drive up the outside of a tank shell while an ultrasonic probe, encased in a rubber wheel, performs ultrasonic B-Scans of the shell plate.
- The ultrasonic signal is relayed and displayed on a laptop screen at ground level. This feed is then captured and a profile is generated of the shell indicating maximum, minimum and mean thicknesses.
- This information is extremely useful in determining the condition of the tank shell. The Scorpion can be operated to the highest point of the tank shell, and is unmatched in its ability to evaluate the shell plate thickness.
Visual Engineering Inspection.
In accordance with API 653 a tank shall be visually inspected to determine its integrity and good standing.
- NEDA has exstensive experience and knowledge of the relevant API standards in order to perform a thorough visual inspection of Above Ground Storage Tanks (AST), Above and Underground pipelines
- Using the required software, NEDA performs calculations according to the necessary standards to determine ‘fit-for-service’ and ‘remnant life’.
Tank Strapping and Calibration
- NEDA performs strapping of Above Ground Storage Tanks for the petroleum industry.
- All strapping is performed according to the “Manual of Petroleum Management Standard Chapter 2A – Measurement and Calibration of Upright Cylindrical Tanks by the Manual Tank Strapping Method".
- NEDA is not limited to only one method of tank strapping and calibration. Alternative methods can also be adopted on request by the client, such as; Chapter 2B – Calibration of Upright Cylindrical Tanks Using the Optical Reference Line Method” OR Chapter 2C – Calibration of Upright Cylindrical Tanks Using the Optical-triangulation Method.
With a developed system of on site strapping (approved by BP SA) NEDA obtains accurate measurements of the relevant ASTs within the given tolerances as stipulated in the above mentioned standards. Circumferences and heights are measured with calibrated equipment and the information is then captured. The product information, such as level, temperature and density, is sourced and worked into the final calculations.
NEDA therefore provides reliable and precise calibration tables for our clients who require a high degree of accuracy.