Determination of the number of flange connection bolts
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The number of bolts required for flange connections is determined; in practice, many cases do not follow the standard specifications for flanges. Instead, the type and quantity of bolts should be determined based on the pressure rating of the flange and the dimensions of the pipes being connected. But those who know the specific regulations please provide an answer!
The number of bolts should be a multiple of 4. When the bolt area is insufficient, try to increase the number of bolts rather than increasing their diameter. Try to use the smallest bolt diameter to reduce the flange torque.
Pipeline flanges generally use standard sizes; there is no need for calculations, as they can be selected according to the specifications.
If petrochemical standards are adopted, standardization is applied; in SH3406, there is a specification regarding the number of bolts for flanges