Ultrasonic Imaging Detection Instrument for Storage Tank Sedimentation
I. Project Background
Storage tanks play a crucial role in the petroleum and petrochemical industry, serving as essential infrastructure for oil storage. Over time, sludge and sediment accumulate at the bottom of these tanks due to the nature of the stored materials. Traditionally, tank cleaning is performed periodically to maintain the integrity and efficiency of the storage system. However, this method is not always effective, as the composition of the oil and its impurities can vary significantly, making it difficult to assess the actual sediment condition accurately.
Current methods, such as using a dipstick to measure sediment height at specific points, only provide limited information and fail to reflect the overall distribution of sediments inside the tank. As a result, tanks are often cleaned unnecessarily, even when the sediment does not interfere with normal operations. Moreover, safety regulations often require the floating roof to be lowered to a safe level during operation, which reduces the tank's utilization efficiency.
To address these challenges, an advanced non-destructive inspection method has been developed. This technology allows for accurate mapping of the sediment distribution on the tank bottom without altering the existing structure. The results not only improve operational efficiency but also provide detailed data that supports more effective cleaning procedures and maintenance planning.
II. Technical Overview
The instrument utilizes ultrasonic imaging technology, similar to medical B-ultrasound systems. By placing discrete measurement points across the tank top, the device calculates the distance from the surface to the sediment based on echo time. Combined with the current oil level, it determines the thickness of the sediment at each point. These data points are then used to create a smooth, three-dimensional image of the tank’s bottom sedimentation.
III. Technical Specifications
• Core Explosion Grade: Exia[ia]BT4
• Protection Class: IP65
• Supply Voltage: 24V
• Operational Time: ≥8 hours
• Detection Accuracy: ≤1cm
• Maximum Detection Depth: 8m
• Output Interface: RS232
IV. Application Examples
The following image shows a 3D simulation of sediment distribution on the bottom of a single-disk storage tank with a capacity of 100,000 cubic meters, as drawn by an Sinopec oil depot:
V. Field Applications
1. Single-Float Storage Tanks: For this type of tank, detection can be directly performed on the floating roof. Multiple measurement points are used to generate a 3D map of the sediment distribution.
2. Double-Float Storage Tanks: Since the sensor needs to be in contact with the liquid surface, multiple manholes must be used for effective bottom detection.
3. Arch Roof Tanks: These are typically smaller tanks. For sediment detection, it is sufficient to use the instrument hole, and high-resolution imaging is not always required.
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