Is there a standard for the verticality of air-cooled axial flow fans?
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The on-site construction team prefabricated two air-cooled units downstairs and then lifted them to the top for assembly. I noticed that the main support beams for the two sets of fans were not parallel, which means that at least one fan shaft did not have the proper levelness. But I couldn’t find the acceptance criteria; the manual only specified the angle of the fan blades, the vertical deviation, and the gap between the fan blades and the air duct. The issue of spindle perpendicularity was not mentioned. The forum search function isn’t working; I can only ask who has relevant information?
The original wording in shs1023 is: The fan supports, whether on a vertical or horizontal axis, should be adjusted so that they are either vertical or horizontal, with a deviation of no more than 0.4 mm/m; furthermore, it is necessary to ensure that the main shaft and the air duct are concentric, with a coaxiality error of no more than 5 mm. I just calculated that 0.4 mm/m is approximately equal to 0.02 degrees. This would have to be found using a frame level, right? . . :L
This doesn’t have such high precision; it’s probably sufficient to measure it with a level. The test vibration after installation is the actual result that needs to be checked. For reference. Note: The installation contract must include a warranty period.