 Provide working condition parameters: pressure rating (PN/Class), temperature, medium corrosiveness, connection standards (such as GB/T, ASME). Example: Roll flanges for oil pipelines must comply with API 6A standards, with a thickness of 25mm and a width of DN500. Supplier selection Qualification requirements: Special equipment manufacturing license (pressure pipeline components), ISO 3834 welding certification. Local reference: A machinery factory in Wushenqi can customize ultra wide flanges (DN3000, thickness 30mm) for wind turbine towers. Drawing review Key dimension annotations: inner diameter, outer diameter, bolt hole distribution circle diameter (PCD), taper (if any). Special requirements: flange surface roughness (Ra3.2~6.3), sealing surface form (RF/FM/RJ). |
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