Re: HOT TAP OVER A PIPE SEAM WELD

From: <bruce.r.raymond@fluor.com>
Date: Sun Sep 02 2007 - 06:30:00 EDT

Paul - excuse my lack of detail - the "initial cutter head" I refer to is the pilot drill, which also catches the coupon. Underwater welding is limited to structural elements for lack of a way to isolate welding from water, with the related cracking / problems in heat distribution in water itself. If you want to be an instant millionaire invent a feasible way that welding can be done in a controlled atmosphere - under water. I guess the bathtub is a starting place, you know there is piping involved in a jacuzzi.
Bruce R. Raymond
Fluor

Paul Bowers <pbowers@pipingdesign.com>
Sent by: PipingDesign@yahoogroups.com
09/01/2007 11:55 AM
Please respond to PipingDesign

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Re: [PipingDesign] HOT TAP OVER A PIPE SEAM WELD

Bruce, when you write "initial cutter head" are you referring to the circular saw part or the bit that retains the coupon after withdrawal?

By the way, how's the market for underwater welders these days, do they make a lot of money? I was thinking of getting into this based on my knowledge of piping, so if you could send me everything you know about it I'll start training in my bathtub. I mean, it can't be as difficult as brain surgery or anything...

Paul

bruce.r.raymond@fluor.com wrote:
> Gentlemen -I am presently heading up a project which involves 2 - 30"
sub
> sea hot taps. Yesterday I talked to my contractor's expert on this &
asked
> the very same question. He told me that they DO NOT want the seam
aligned
> with the initial cutter head, but as long as there was no interference
> with the initial cutter head, they could bore the pipe with no problems,

> Also cutting through the weld seam provides an advantage, for besides
> inspection of the pipe, it allows inspection of the weld seam type &
> protrusion into the pipe itself. Since I am setting stopples in my hot
> taps this will allow specialized configuration of the stopple seats to
> allow for better seating. Also I have come across a different type of
hot
> tap tee which can be applied above or below water, designed per B31.8, &

> is applied to the pipe with no welding required, neat stuff. Allows a
hot
> tap with no hot work.

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[Non-text portions of this message have been removed] Received on Sun Sep 02 06:30:00 2007