Pump inlet and outlet flanges, mating flanges, sealing surfaces, parallelism, concentricity requirements
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When installing the mating flanges on the inlet and outlet pipelines of a pump, it is necessary to ensure that there is a certain degree of parallelism and concentricity with the flanges at the pump’s inlet and outlet. What are the acceptable values for this parallelism and concentricity? Do any of you have any standards to refer to? ?
Requirements are specified in both SH/T3538 and API686
Thank you, SuperVersion – you’re so knowledgeable. I’ll go take a look
Construction and welding specifications for GB50236, GB50235, and GB50184 pipelines
Are you a construction worker? As long as you position the pipes properly, there shouldn’t be much of a problem, right?
Petroleum standards: Mainly based on the equipment speed. First: rotational speed
API standard: Determined based on the outer diameter of the flange: if the outer diameter of the flange is ≤ 250 mm, the parallelism of the flange shall be ≤ 0.25 mm； Flange outer diameter > 2.50 mm; flange parallelism: flange outer diameter / 1000 mm and ≤ 0.75 mm ； Axial displacement after bolt tightening: Regardless of the uniform outer diameter of the flange, the axial displacement shall be ≤ 0.05 mm
Petroleum standards: Mainly based on the equipment speed. Distance between equipment and pipeline flange surfaces: the minimum distance that ensures smooth insertion of the gasket in a free state. First: rotational speed