Re: [MW:17745] LTCS PIPES WELDED WITH CS FITTINGS

Dear Mohamed:

Use Positive Material Identification (PMI) and check the Mn content of the base metal (and weld metal).

A333 has higher Mn content than A106 and can this can be the criteria for identification.

Another method is hardness test. Normally A333 should have lower hardness comparing to A106 but it is not a clear distinction (I do not recommend this test but it is easy and cost effective since you can use portable hardness testers).

Insist on one of these methods, especially PMI. It has a reasonable logic and some clients use it for verification of LTCS pipes like A333 otherwise you will have to cut and go through the fabrication all over again.

Regards

Ramin Kondori

Sr. QA/QC Engineer

SINOPEC

r.kondori@petroyada.com
+98-2123592322
+98-9132150320

On Wed, May 22, 2013 at 6:30 AM, mohamed kalemullah <qaman2007@rediffmail.com> wrote:

DEAR ALL,

THIS IS TO INFORM YOU THAT IN OUR NAPTHA CRACKER PROJECT LTCS PIPES/LTCS FITTINGS ARE WELDED WITH CS FITTINGS/CS PIPES.

THE CLIENT DURING THE FINAL LINEWALK PRIOR TO HYDRO/PNEUMATIC AIR TESTING ARE OBSERVED THAT THE LTCS FITTINGS ARE WELDED WITH CS PIPES. HENCE THEY REJECTED THE TEST PACKAGES AND ASKING  US(SUBCONTRACTOR) TO CONFORM THE MATERIALS SPECIFICATION PRIOR TO HYDROTEST.

DURING THE RECHECKING THE LINE WE OBSERVED THAT PAINTED/SMALL PIPES ARE INSTALLED(WITHOUT HEAT NO) AND FITTINGS ARE DIFFICULT TO VERIFY DUE TO THE HIGH ELEVATIONS.

LTCS MATERIALS----------ASTM A 333GR.6/ASTM A 350 LF2/ASTM A 420 WPB

CS MATERIALS--------------ASTM A 106 GR.B/53/ ASTM A 105/ASTM 234 WPB.

CLIENT IS ASKING TO CUT ALL THE JOINTS AND CHECK THE ENTIRE LINES AND SHALL MEET THE LTCS REQUIREMENTS. ALL CS TO BE CUTOUT AND REWELD WITH LTCS .

NOW WE INCREASED QC INSPECTORS TO VERIFY THE LINE. WE NEED TO KNOW HOW TO SOLVE IT AND DO THE HYDRO TEST.  FITUP INSPECTION REPORTS ARE NOT ACCEPTING BY THE CLIENT AND NOW ASKING  FOR THE COMPLETE VERIFICATION OF THE LINE WITH PRACTICALLY.

PLS.ADVICE AND THANKS,

KALEMULLAH

D&Y ALLIED ENGG.

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