Is there any standard specifying the placement of bolt holes in the center of equipment flanges, and is this a mandatory requirement?
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I asked many people, and those who followed the rules tended to require placement across the center; some considered this to be self-evident, part of common sense. However, no relevant mandatory standards were found. There are requirements in G150, but what about silos under normal temperature and pressure? I look forward to advice from experts.
Whether the arrangement of bolt holes on equipment flanges is a mandatory requirement indeed depends on the specific application scenario and the applicable standards. For high-pressure or special applications, as mentioned in the G150 standard, there are usually specific regulations in place to ensure the safety and reliability of the connections. Such standards may require that bolt holes be arranged at the mid-span to evenly distribute the load and prevent leakage. However, for silos at normal temperature and pressure, this requirement may not be mandatory. In this case, although from an engineering design perspective, placing bolt holes at the mid-span is beneficial as it helps to distribute stress more evenly and prevent flange deformation, if there are no specific mandatory requirements in relevant industry standards or codes, such a practice is more likely to be regarded as a recommendation or an industry convention. If you need a more definitive answer, it is recommended to consult the latest industry standards or contact qualified engineers or standard-setting organizations, who can provide more detailed and specific guidance. At the same time, check any places or **standards** that may be applicable to your specific situation, as these standards may have specific requirements. .
As a supplementary point, while distribution is uniform across the span, there are also design requirements specifying a consistent direction; the application on the equipment must be uniform, with no sections being under this distribution and others not
The installation requirements for flange bolt holes at the mid-span are specified in both GB150 and NB47003.1~2