Issues regarding the standards for axial tilt and radial displacement in the alignment of laminated flexible couplings used for the alignment of pump machinery
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Hello, experts on this forum. I have a question regarding the standards for axial tilt and radial displacement in the alignment of laminated flexible couplings used for aligning pump units. I’ve been struggling to figure this out; I’ve searched through many resources, but there are numerous different opinions, which only makes things more confusing. The standards for axial tilt and radial displacement in the alignment of laminated flexible couplings vary depending on the standard being used: 1. In the “SHS 03059-2004 General Standards for Maintenance and Quality Control of Chemical Equipment”, the allowable deviation values for alignment are described as follows: 2. In the “SHT 3541-2007 Standards for Construction and Acceptance of Petrochemical Pump Units”, the allowable deviation values for alignment are determined based on the number of holes in the laminated coupling and its outer diameter. Is it possible that the unit for measuring axial tilt isn’t specified in those standards? 3. The allowable alignment deviation values specified in the \"SHT 3538-2017 General Specifications for the Construction and Acceptance of Petrochemical Machinery and Equipment Installation Projects\" are also determined based on the machine’s rotational speed ； Therefore, I would like to ask the experts here: 1. Under what circumstances should each standard be used? What are the typical values for axial tilt and radial displacement? 2. Is the unit for axial tilt in the specifications mm/m? How is it measured? Is it the ratio of the change value indicated by the dial indicator on the end face to the rotational radius? I hope all the experts here can help me answer my questions. I’m extremely grateful, and I wish everyone a happy New Year!
If it’s about design, that’s a different matter; but when it comes to operation, following the instructions is the standard approach. For reference.
Personally, I think classifying by speed is the right approach
The reason for using a \"laminated flexible coupling\" may be the deformation of the main unit caused by temperature differences. For example, in the case of fans driven by hydraulic couplings, the requirements for static alignment of the equipment specify a large allowable deviation; as the equipment reaches its normal operating condition, this deviation decreases. The factors taken into account in the original design are reflected in the instructions; if strict national or industry standards are to be followed, they can only serve as a general reference, with the requirements outlined in the instructions being the most reliable. For reference.
It is recommended to use the instructions as the standard