Javed Your question is quite intriguing. If your management had already decided about A 387 P 11, your question of alternate A 387 P 22 (Cl 1 or 2) looks like a superfluous question or answer in a discussion forum. With refractory lined vessel, both P 11 or P 22 will work the same with temp of around 350 deg cent on the outer shell so long as there is no weak spot in refractory lining. For this temp of 350 deg cent on outer shell P 11 or P 22 would behave similar even at a long temp exposure (creep related effects). P 11 or P 22 requires care in welding, welding design, pre-heat to 250 deg cent, root run examination by WFMPT before subsequent runs, all butt welds to be RT / UT scan after completion of welding, PWHT to 700 deg cent + 10-20 deg cent for sufficient time - atleast minimum of 1 hr at holding temp, slow cool upto 200 deg cent at 100 deg cent per hour and then still air cool from 200 deg cent (holding time at 700 deg cent will vary depending on the thickness of shell plates used), hardness check aftter PWHT beforfe final refractory lining. If you do that, both P 11 or P 22 should behave similar so long as you do not expect voids in refractory lining in your rotray kiln in CCU plant. Trust this helps you to decide on procedure, pre heat, PWHT for either P 11 or P 22. If designer had given AT 516 Gr 70, even that will do for most applications so long as there is no void in refractory lining. C.V.Srinivasan Nishi Engineers Pvt Ltd India May 23, 2007 E-mail: nishi@vsnl.com >dear friends > > thanks in advance ......let me get to the point straight >away.....my problem is regarding the rotary kiln shell >material replacement/repair in the CCU plant ( >licensor--Swedela/USA) of our refinery which processes raw >petroleum coke from DCU bottom to calcined petroleum coke >....recently when we inquired about the availability of ASTM >A 515 Gr. 60 (rotary kiln shell material) we were informed >that manufacturer's have stopped producing this particlar >material.... >however we were informed about the availability of ASTM A >516 Gr.70 as well ASTM A 387 Gr.11(P11)...management has >already made up its mind to go for the second option i.e. >P11......however i wud like to search for any better >option....i would like to ask you all what do you people >think of ASTM A 387 Gr.2(Class 1 or Class 2)......for your >information the shell material has refractory lining from >inside....kiln temperature at the place of repair remains >about 1400 C and shell material temperature remains in the >range of 300-350 C as measured and reported by operation >group of the plant as well as per plant >manual......temperature exposure is for long durations...so >creep resistance will definitley be an important >factor.....material should have coarse grained structure >preferably......somebody even suggested that we go for >SS...what do you people think.............kindly do give >some suggestions on the welding procedure , preheat , PWHT >requirements to be followed as well as the possible >difficulties unaccounted for enroute....you can write to me >personally at finiteinjustice@yahoo.co.uk & >finiteinjustice@gmail.com