Gr 91Steel,OD 60.3mm and Thickness=  11.07mm, or less, pressure = 6 bars, temp= 585  c   Gr 11Steel,OD  60.3mm and  Thickness=  11.07mm  pressure = 6  bars 

Weld with ER‐ 80SB2+E‐8018B2,   No PWHT AS Per,  Sec‐I, Table PW‐39‐3  & 39‐4 

 

Weld with ER‐90SB3+E‐ 9018B3   PWHT AS Per, Sec‐I, Table  PW‐39‐5  PWHT Temp , 740± 10 Deg C  Soak Time, 30 min minimum 

Intermediate Piece of  Gr 22  Steel, Suggested OD. 60.3mm  and Thickness= 11.07mm,  pressure = 6 bars  temp= 585 c.  Suggested Length­ 500mm  minm or More, so that the  heating pads used on the  next weld would  not overlap  on this weld.   

  P‐No. 4 Group No. 1,2‐  Minm PWHT Temp ‐1200 Deg F (650 Deg C)  P‐No. 5A Group No. 1 and P‐No. 5B Group No. 1, Minm PWHT Temp ‐1,250 Deg F (675 Deg C)    P‐No. 15E Group No. 1 ‐1,350 (730) TO  1445 Deg F (785 Deg C)  Allowable Stress @ 600 Deg C:‐ as per ASME Sec‐II Part –D.    

Gr 11‐ 17.6 Mpa,   Gr‐22,‐23.5 Mpa  Gr 91‐65.0 Mpa 

Hence you have problem with Gr 11 steel, upon prolonged exposure @ 585 Deg C.  I would think the other way to sustain  longer life would be to increase section thickness of Gr 11 steel in accordance with allowable stress values of  Sec­II, Part – D.     

Minm PWHT Temp -

Gr‐22,‐23.5 Mpa. •. Gr 91‐65.0 Mpa. Hence you have problem with Gr 11 steel, upon prolonged exposure @ 585 Deg C. I would think the other way to sustain.

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