RE: Flange bolt-holes orientation

From: <Bruce>
Date: Wed Sep 04 2002 - 11:02:00 EDT

Imagine yourself as the fitter. ALWAYS have the flange bolts in an orientation that maximizes access. In the event that the end flange is essentially a manway, still avoid having any bolt in a position that can be considered "top dead center" (or bottom). I can't think of a single time when the fitter, technician or field operations engineer ever spoke well about the designer who placed a bolt at the compass-point, centerline, top, or similar. They are always bad enough to access as it is. Fact is, a good designer always designs, as long as it doesn't conflict with a code, to provide maximum access for the craftsman. (I was once a maintenance supervisor, can you tell?)

                                         ... Bruce D. Bullough ...
                                         Sebesta Blomberg & Associates
                                         2381 Rosegate
                                         Roseville, MN  55113
                                         651-634-7344 (office)
                                         651-634-7400 (FAX)
                                         www.sebesta.com

-----Original Message-----
From: Liu, Robert [mailto:robert.liu@ue-1.com] Sent: Wednesday, September 04, 2002 9:17 AM To: 'PipingDesign@yahoogroups.com' Subject: [PipingDesign] 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

Texas Flange - a good source for information on industrial flanges, all they ask is for referrals for designs they help with. 877-610-8924.
www.texasflange.com

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Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Wed Sep 04 11:02:00 2002