We are using A672 C65 CL32 Pipe Nace + HIC for sour flare with (H2S>500PPM)up to 68" size. We want to extend the same piping material for 106" line. The design pr. is 3.5kg/cm2 + half vacuum,design temp. range 180 to 300 degree C. Corresion allowance is 3mm. Please advise whether we can extend the present specification upto 106".