ASME SEC VIII Div1- UG-36 & UG-42 Nozzles RF pad requirements & mulitiple Nozzles opening
Ponnikumar
Amol Betkar
Dear,
Let's address each query with detail:
6" nozzles required RF pad or not? According to the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, specifically in UG-36, when the thickness of the vessel wall exceeds 10 mm (or 0.394 inches), reinforcement pads are typically required for nozzles larger than 2 3/8" ID. However, there are exceptions based on specific design considerations and loadings.
In the case of the vessels you mentioned, if the thickness of the vessel wall where the 6" nozzles are located exceeds 10 mm, then RF pads may be required. The decision to use RF pads depends on factors such as the design pressure, vessel material, service conditions, and nozzle loads. RF pads help distribute the stresses and loads at the nozzle-to-vessel junction, enhancing the structural integrity of the vessel.
Engineers and fabricators need to conduct detailed stress analysis and consider factors like nozzle loads, internal and external pressures, thermal effects, and the mechanical properties of the vessel material to determine whether RF pads are necessary. Additionally, industry standards and codes may provide further guidance specific to the application.
6" nozzles in-between 2" nozzles with maintaining 500mm center-to-center distance - minimum distance requirements: Maintaining adequate spacing between nozzles is crucial to ensure proper operation, maintenance access, and structural integrity of the vessel. The minimum distance between two nozzles depends on various factors, including vessel design, nozzle size, nozzle type, and applicable codes and standards.
In the scenario you described, where 6" nozzles are positioned between 2" nozzles with a specified center-to-center distance of 500 mm, it's essential to confirm whether this distance meets the minimum requirements outlined in the relevant design codes and standards, such as ASME BPVC Section VIII, Division 1.
Typically, the minimum distance between two nozzles is determined to prevent interference, facilitate maintenance activities, and ensure proper reinforcement of the vessel walls around each nozzle. Factors such as the diameter and orientation of the nozzles, nozzle loads, and vessel geometry influence the minimum spacing requirements.
Engineers and designers should refer to the applicable design codes, conduct stress analyses, and consider specific project requirements to determine the suitable spacing between the 6" and 2" nozzles. If the specified center-to-center distance of 500 mm meets or exceeds the minimum requirements specified in the applicable codes and standards, it should be acceptable. However, it's crucial to verify this through thorough engineering analysis and review.
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