Re: Hot Tapping Plant Air and Instrument Air

From: <Arif>
Date: Wed Nov 27 2002 - 14:11:00 EST

Hot tapping of instrument air line is not allowed since metal can go in the instrument air header during the tapping operation. Recently I worked on a project where no spare valve was available but since the new instrument air line was only 1" NPS , we managed to use one of the vent valve on the instrument air header. In other instance when we used spare connection , we provided additional spare connection on new line to avoid problem for future tie in problem

Arif Patel

>From: "regoldst" <regoldst@attbi.com>
>Reply-To: <a href="/group/PipingDesign/post?postID=tyftNXF7AvbZEQQhI8pQrG4ytkLHD0ViZBny8LkW77FCCLFzyWpLmtIShkWIXy9RCBrkcesY3aNlsNgB7w53GXo6E_9lhy8">PipingDesign@yahoogroups.com</a>
>To: <a href="/group/PipingDesign/post?postID=tyftNXF7AvbZEQQhI8pQrG4ytkLHD0ViZBny8LkW77FCCLFzyWpLmtIShkWIXy9RCBrkcesY3aNlsNgB7w53GXo6E_9lhy8">PipingDesign@yahoogroups.com</a>
>Subject: [PipingDesign] Hot Tapping Plant Air and Instrument Air
>Date: Wed, 27 Nov 2002 00:48:12 -0000
>
>I'm presently working in a Major Oil Refinery in the United States
>and I was told that you can't Hot Tap air lines due to the generaed
>heat problems and the Refinery won't allow clamp-on tees for Tapping,
>so I'm at a loss for ideas. Shutting down plant air and instrument
>air is out of the question and spare valved connections have been
>used, so I'm looking for ideas. I don't remember this being a problem
>in the past. Has there been a recent code change or have I been doing
>this wrong for the last decade or so?
>
>

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