How to determine the spacing between collection ports for capturing leaking flammable vapors
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There is a very long process pipeline in use for transporting flammable liquids; in the event of a leak, flammable liquids and flammable vapors will be generated. Due to process requirements, this pipe must be maintained at a low temperature; therefore, a duct is designed to be placed around this process pipe, with air being supplied inside the duct to maintain the low temperature. To deal with leaks in the process pipelines, this duct is equipped with collection tanks at regular intervals (to capture any leaking flammable liquids) and exhaust ports (to capture any leaking flammable gases). The question now is: how to determine the distance between the collection tank and the exhaust port. If the spacing is too small, it increases costs ； If the spacing is too large, it may affect safety. I seek guidance from the experts. Are there any standards or manuals that specify this?
Based on comprehensive factors such as the length, diameter, wall thickness of the process pipelines, the flow rate of the medium, and leakage conditions, the following methods can be used to determine the distance between the collection tank and the exhaust port: 1. Calculate the maximum diffusion distance of flammable gases in accordance with relevant standard requirements, and use this distance to determine the separation between the collection tank and the exhaust port. For example, the regulations of the American Society of Transportation of Hazardous Materials (49 CFR 172.514) recommend that, in the event of a leak of flammable liquids through pipelines, the distance between the collection tank and the exhaust outlet should not exceed 100 feet. 2. Simulation tests can be conducted based on actual conditions; by simulating leakage situations, the distance between the collection tank and the exhaust port can be tested to determine the optimal values for safety and cost-effectiveness. 3. Based on the practical experience of relevant technical personnel and safety management requirements, and by taking into account factors such as the distance between the collection tank and the exhaust port as well as other safety aspects, a reasonable range for this distance is determined. At the same time, equipment should be regularly inspected and maintained to ensure its proper operation and to enable timely handling of leakage incidents. In summary, when determining the distance between the collection tank and the exhaust port, it is necessary to take into account various factors such as safety, cost, and practical effectiveness, and to evaluate them based on relevant standards, specifications, and experimental data in order to determine the optimal solution. .
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