RE: Flange bolt-holes orientation

Robert,

Martine and my answer will not match, only if you are dealing with a line running at a strange angle i.e. NW. (How can bolt holes straddle N/s if the line is not running N/S ?) Apart from that, my answer works with Martines. The bolt holes should straddle the principle Cl of the pipework (On most plants, the pipework should run N/S and E/W mainly and large runs of 'angled' pipe are usually frowned upon due to the 'future' space that they are taking up.)
If you have any doubt regarding the orientation of the boltholes, then put a note/detail on the isometric at the joining flange. Personally I would not be too concerned, because if the line running NW etc. will usually be on the same isometric (Unless they are two seperate lines), the fabricator will adjust the positions of the boltholes to suit. (Make sure that when the two spools join together they will have matching boltholes and the spool orientation is unchanged) If in doubt, put a detail on the iso, also Im sure that on the ue-1 job, Fluor, Bechtel et al have very good standards, may I suggest you look through them for guidance, or indeed, ask the construction/fabrication supervisor for advice also. Asking a question like this where you work is not a sign of weakness or stupidity, the stupid ones are the people who just go ahead and do it one way, only to find out it is wrong when it gets to site, so ask!! As regarding the answer from Gabriel, there is very seldom that I have seen a 'bolt hole up' orientation on a line running horizontally. The only time I have seen this was to aid with the orientation of a lever on a 4 hole flanged valve. i.e. If the bolt holes had stradled the CL we couldnt orientate the valve lever for easy use (with extended spindle) by rotating 90 degrees through the principle angles,at a time. The only way we could fit the spindle in was to have the valve 'cranked' over at 45 degrees,so we had the bolt holes on the CL of the pipe as opposed to straddling it. (A picture would be easier than words)

> -----Original Message-----
> From: robert.liu [mailto:robert.liu@ue-1.com]
> Sent: 12 September 2002 00:06
> To: PipingDesign
> Cc: robert.liu
> Subject: RE: [PipingDesign] Flange bolt-holes orientation
>
>
> Experts or seniors help!
>
> Obviously Martine's opion does not match with Steve. Anybody
> can help me out
> here!!!!
> Robert Liu
>
> -----Original Message-----
> From: Martine Lynch [mailto:Marly@statoil.com]
> Sent: Tuesday, September 10, 2002 10:34 AM
> To: <a href="/group/PipingDesign/post?postID=P186PwuGwMISygr1c0RgWUZ9F9IksIHtLut2XM29HLsTdybL0vRPsFlI2mtuuZ8oxgp96Il5ZPoduqCpCDQRpcJXfw">PipingDesign@yahoogroups.com</a>
> Cc: 'PipingDesign@yahoogroups.com'
> Subject: RE: [PipingDesign] Flange bolt-holes orientation
>
>
>
> Bolt holes should straddle the horizontal or vertical centre
> lines or the
> plant north/ south centre lines when orientation is not given on the
> isometric.
>
> Martine
>
>
>
>
> "Liu, Robert"
>
> <robert.liu@u To:
> "'PipingDesign@yahoogroups.com'" <PipingDesign@yahoogroups.com>
> e-1.com> cc: (bcc: Martine Lynch)
>
> Subject: RE:
> [PipingDesign]
> Flange bolt-holes orientation
> 10.09.2002
>
> 16:04
>
> Please
>
> respond to
>
> PipingDesign
>
>
>
>
>
>
>
>
>
> Hi all,
> Can anyone reply this question please? Is there such rule?
> I'm more confused.
> Thanks
> RObertliu
>
> -----Original Message-----
> From: <a href="/group/PipingDesign/post?postID=W8jlUX9p8hl3VxOxBqKZcj5biYHUBwhq0c4G8aR1XBpU5KaKw7t0cexYXZjOLl0dCfeE6tpVFNVMhMrIpBhPxShs">gabriel.tossi@kvaerner.com</a> [mailto:<a href="/group/PipingDesign/post?postID=W8jlUX9p8hl3VxOxBqKZcj5biYHUBwhq0c4G8aR1XBpU5KaKw7t0cexYXZjOLl0dCfeE6tpVFNVMhMrIpBhPxShs">gabriel.tossi@kvaerner.com</a>]
> Sent: Monday, September 09, 2002 11:20 AM
> To: <a href="/group/PipingDesign/post?postID=P186PwuGwMISygr1c0RgWUZ9F9IksIHtLut2XM29HLsTdybL0vRPsFlI2mtuuZ8oxgp96Il5ZPoduqCpCDQRpcJXfw">PipingDesign@yahoogroups.com</a>
> Subject: RE: [PipingDesign] Flange bolt-holes orientation
>
>
> I think there must be a rule like "alway orientate one bolt-hole in
> UP-direction (for horizontal lines) or N-direction (for
> vertical lines) in
> accordance with the ISOMETRIC"
>
> With something like this there must be NO problems (if both Iso's are
> correctly done!!!)
>
> Regards,
>
> Gabriel L. Tossi
> Piping Material Engineer
> * +31 (0)591 693462
> * mailto:<a href="/group/PipingDesign/post?postID=W8jlUX9p8hl3VxOxBqKZcj5biYHUBwhq0c4G8aR1XBpU5KaKw7t0cexYXZjOLl0dCfeE6tpVFNVMhMrIpBhPxShs">gabriel.tossi@kvaerner.com</a>
> KVAERNER Process BV
> Houtsingel 5 - Zoetermeer
> The Netherlands
>
>
>
> From: Liu, Robert [robert.liu@ue-1.com]
> Sent: Friday 6 September 2002 19:01
> To: 'PipingDesign@yahoogroups.com'
> Subject: RE: [PipingDesign] Flange bolt-holes orientation
>
> Thank you for reply.
> But if this is true, then what if I have another spool: Starts with a
> flange
> which is bloted with the first flange them an elbow which is going to
> diferent angle with the first spool.
> If the fitter do these spools as you said: orientate
> boltholes either side
> of that" so how can these two spools match up on site since
> they going to
> different angle so are boltholes?
> Thanks again.
> Robert Liu
>
> -----Original Message-----
> From: <a href="/group/PipingDesign/post?postID=m1NuEujJ0aJTXIcPg7jFch4jQwhZt33efk9bqZzNS8PvwMWVUi1oG1NrKyPKwQB9UNhMB8bWHGr5PUIjkiaCNIx8cgUkFgceIFE">steve.mcshannon@expro.shell.co.uk</a>
> [mailto:steve.mcshannon@expro.shell.co.uk]
> Sent: Wednesday, September 04, 2002 8:27 AM
> To: <a href="/group/PipingDesign/post?postID=P186PwuGwMISygr1c0RgWUZ9F9IksIHtLut2XM29HLsTdybL0vRPsFlI2mtuuZ8oxgp96Il5ZPoduqCpCDQRpcJXfw">PipingDesign@yahoogroups.com</a>
> Subject: RE: [PipingDesign] Flange bolt-holes orientation
>
>
> ARE YOU BEING SERIOUS !??!!?!
>
> When the line is being fabricated as a spool, the fabricator
> doesnt know
> that the line is necessarily running NW (Very probably using spooling
> drawings). The bolts will still stradle the principle CL of the pipe.
> i.e. They will treat the line (running NW) as though it was running
> north and orientate the boltholes either side of that.
>
> > -----Original Message-----
> > From: robert.liu [mailto:robert.liu@ue-1.com]
> > Sent: 04 September 2002 15:17
> > To: robert.liu; PipingDesign
> > 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
> >
> >
> >
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> > --------------------------------------------------------------
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> >
> > 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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> [Non-text portions of this message have been removed]
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>
> 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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>
> 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
> =====================================================
> unsubscribe: <a href="/group/PipingDesign/post?postID=r4IeKwJs0f3QwlYzR-6HO8xf_ev5tlHBggzRns2pSoilQgSPVS86_9cK2-orAtOXFJo8q4IKCwkH8h26DXXvD_HpKpJek1nVmVfMP0xUuG8">PipingDesign-unsubscribe@yahoogroups.com</a>
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>
> 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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> they ask is for referrals for designs they help with.
> 877-610-8924.
> www.texasflange.com
> =====================================================
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> 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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> --------------------------------------------------------------
> -------~->
>
> 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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[Non-text portions of this message have been removed] Received on Thu Sep 12 04:09:00 2002