I'm searching for any information regarding BOLT SPACING on large custom mating flanges (48"-120") that seal a VACUUM vessel with an O-RING. I cannot find any literature with this combination to determine minimum # of bolts. Appendix 2 and Appendix Y only seem to account for positive pressure. Configuration matches App.Y-5.2 Category 3 with an o-ring groove and no hubs. (Bolted flanged door to a vacuum chamber.) I don't see where B16.5 rates for external pressure and Taylor Forge eq. seems to apply for leakage and/or bending between bolts which I do not believe are the same for vacuum. Is there ANY published guidance for this?
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