Thanks for your response.
One more clarification. In our project, for hot tapping activities, split tee welding is going on with out any procedure qualification. As per sec IX QW290.4 , fluid backing, heat input etc... are essential for temper bead welding. For that essential variables no PQR has been qualified.Need separate procedure for doing these activities or no need? Plz clarify.
On Mon, Oct 4, 2010 at 12:54 AM, Declan Foley <declan1foley@eircom.net> wrote:
Arvinda,
No relationship.....temper bead is a welding process.........hot-tapping is a mechanical process, which involves drilling into a vessel or pipeline!
temper bead is the welding process usually ( but not always ) employed when welding the hot tap fittings (usually weldolets, split tee's etc....) onto the vessel or pipeline as part of the hot tap process.
As regards qualifying welders, you should be very careful here, because depending on service, this can be a hugely critical operation, and doing it wrong can have catastrophic results. Its a while since I have done any but as far as I can remember the best specs are British Gas ( Transco ) PS-P2 & PS-P9
regards
Declan
On 03/10/2010 11:13, arvinda shan wrote:--Dear all,
What is the relation between temper bead and hot tapping? Is there any specific procedure to qualify for hot tapping or only welders to qualify downhill progression?
arvinda
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