North America 1-866-333-5888
E-mail: info@scanningtech.com
Global Solutions 1-780-410-0563
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North America 1-866-333-5888
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E-mail: info@scanningtech.com
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Global Solutions 1-780-410-0563
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Global Solutions |  |
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Gamma Scanning
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(Tower Scans & Column Scans)
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| ScanTech's Gamma Scanning service is a quick and reliable technique for evaluating the operating characteristics inside your distillation towers. Gamma Scans have been proven effective on both packed bed and trayed towers and are used for observing process fluids (liquids, foam and vapor) in real time and determining the condition of components inside the tower.
The Gamma Scan provides valuable information that can not be obtained through any other method. The tower scan is classified as a primary investigation tool in tower diagnostics and troubleshooting due to the quality and quantity of information obtained. This classification is enhanced by the inexpensive cost of a Gamma Scan compared to lost production. Henry Kister lists Gamma Scanning as an effective investigation tool in his book "Distillation Tower Design" Gamma Scanning is used to evaluate the performance of distillation towers in real time at refinery and petrochemical sites. Our services can be used to:
Baseline Gamma Scans are performed after a startup or when a tower is running efficiently to define an operational reference condition within the tower. The baseline scan can be compared to future scans to determine how the tower is responding over time or is responding to changes in operating conditions. The Gamma Scan can be used to evaluate many different types of vessels including: |
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Gamma Scanning Theory
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| The Gamma Scan is performed using a small radioactive source and a sensitive electronic detector. The source and detector are kept external to the tower and positioned on opposite sides at a fixed distance apart . Gamma rays travel from the source through the tower to the detector where they are counted. A denstiy profile is generated when gamma rays are moderated by the contents inside the vessel. Vapour allows more gamma rays to pass through and therefore appears less dense than a liquid or solid. The Gamma Scan is performed while your tower is operating at process conditions. The data is not normally affected by the shell wall, insulation or cladding. The density value obtained from a Gamma Scan is an average relative density over the diameter of the tower and includes everthing within the scan path except the steel shell which is accounted for in our calculations. | ||||
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Performing the Gamma Scan
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Our experienced personnel can perform Gamma Scans on almost any type and size of tower ranging from 0.5m to 10m in diameter. Our servcies usually require no preparation of the vessel or alteration to your process. Gamma Scans can be performed from exisiing platforms and through insulation on vessels. This service is external to the vessel and is therefore not affected by pressure and termperature.
The Gamma Scan equipment is highly portable. Our personnel can travel to any location with only 2 cases and a radioactive source drum. The equipment is carried to the top of the tower by the ScanTech crew. All equipment remains external to the tower for the entire scanning operation. Guide ropes for the source and detector are attached to the tower to ensure scan orientation and as an additional factor of safety during the scan. The scan proceeds from the top of the tower to the bottom with only the equipment moving. The scanning crew remains on the top platform unless required to move due to tower configurations. At the completion of the Gamma Scan, all of the equipment is returned to the shipping cases and the preliminary report is generated for the customer. A final report is sent in PDF and hardcopy format. |
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