Re: Clarification needed regarding flange bolt hole straddling!

Those that have access to the piping design discussion list archives (I.E., have a yahoogroups account) can look here <a href="http://groups.yahoo.com/group/PipingDesign/messagesearch?query=straddle">http://groups.yahoo.com/group/PipingDesign/messagesearch?query=straddle</a>

This subject was covered last year and there are a few replies there. An ex-maintenance supervisor (Bruce) had this to say:

From: "Bruce Bullough" <bbullough@sebesta.com> Date: Wed Sep 4, 2002 11:02 am
Subject: RE: [PipingDesign] Flange bolt-holes orientation

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?)

• Original Message ----- From: "sid smiles"

> Dear everybody,
>
> I read that the flange bolt holes should not be on
the north axis on the flange face if the flange face is in horizontal plane and if in vertical plane should not be on the vertical axis. I asked to some people personally but they say it is being followed as thumb rule. But there is some specific reason and I want to know it. Can anybody pls throw light on this matter?
>
> Thanking you in advance!.
Received on Fri Mar 07 23:06:00 2003