Flange bolt-holes orientation

All,

Unless otherwise noted, piping spool fabricator will assemble flange so that the bolting holes straddle the principal center line of piping or equipment. so what if I have:

1. Piping runs from SE to NW then an Elbow tuning straight down, on the end of Elbow there is a flange. What orientation the bolting holes will be?
2. piping runs from SE to NW. In the middle of this piping run, there is a Olet type branch, after the Olet there is a flange. So what orientation the bolting hole will be?

Thanks a lot!
Robert Liu Received on Wed Sep 04 10:17:00 2002