Re: [MW:13688] Regarding ptc required at MDMT-35 deg centigrade

If you are welding nozzle neck to flange, it is called a Category C weld, which does not require PTC, PTC is only required on Category A & B welds, but if you have an Elbow welded to the nozzle neck, then that is a Category B weld, which require a PTC. The way you can get away with it (especially that you are using low temp material) is to used WPS that is qualified to -35C and filler materials that are qualified to -35 C, then you can exempt your nozzle welds per UCS-67(d)

On Tue, Feb 14, 2012 at 4:53 AM, Vivek Pandey <vivek.pande06@gmail.com> wrote:

Dear sir,


 I have some confusion regarding requirment of PTC. i have come across
some stregenth problem due to PTC requirement .as per my job MDMT of
that is -35 deg centigrade. as per drg/client i have been attached 2
PTC during welding of shell long seam with SMAW+ SAW process. .my
question  there is required additional PTC for nozzle pipe to flange
joint.i am using for this joint GTAW + SMAW. as per TPI nozzle to
flange joint coming in category B joint so there is required
additional PTC if you are using different welding process other than
category A & B joint of shell long seam and cirseam.
CODE OF CONSTRUCTION ASME SECTION VIII DIV1       MDMT-35DEG
MATERIAL OF PIPE =SA333 GR6,
FLANGE MATERIAL SA350 LF2 CL1
Thk 11.06
1) Is there required PTC for above same material at MDMT-35 Degree centigrade.
2) Nozzle to flange joint coming in which category of weld joint.
3) does above impact tested product material fall in curve B of UCS 66

plz reply your anwer as soon as possible with suitable clarification
as per code requirement


Regards
VIVEK

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